Patent Grant
12043852
The present application contains a Sequence Listing which has been submitted in ASCII format via EFS-Web and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Jun. 28, 2022, is named H082470224US02-SUBSEQ-EPG and is 3,977,840 bytes in size.
Targeted editing of nucleic acid sequences, for example, the targeted cleavage or the targeted introduction of a specific modification into genomic DNA, is a highly promising approach for the study of gene function and also has the potential to provide new therapies for human genetic diseases.1 An ideal nucleic acid editing technology possesses three characteristics: (1) high efficiency of installing the desired modification; (2) minimal off-target activity; and (3) the ability to be programmed to edit precisely any site in a given nucleic acid, e.g., any site within the human genome.2 Current genome engineering tools, including engineered zinc finger nucleases (ZFNs),3 transcription activator like effector nucleases (TALENs),4 and most recently, the RNA-guided DNA endonuclease Cas9,5 effect sequence-specific DNA cleavage in a genome. This programmable cleavage can result in mutation of the DNA at the cleavage site via non-homologous end joining (NHEJ) or replacement of the DNA surrounding the cleavage site via homology-directed repair (HDR).6,7
One drawback of the current technologies is that both NHEJ and HDR are stochastic processes that typically result in modest gene editing efficiencies as well as unwanted gene alterations that can compete with the desired alteration.8 Since many genetic diseases in principle can be treated by effecting a specific nucleotide change at a specific location in the genome (for example, a C to T change in a specific codon of a gene associated with a disease),9 the development of a programmable way to achieve such precise gene editing would represent both a powerful new research tool, as well as a potential new approach to gene editing-based human therapeutics.
Another drawback of current genome engineering tools is that they are limited with respect to the DNA sequences that can be targeted. When using ZNFs or TALENS, a new protein must be generated for each individual target sequence. While Cas9 can be targeted to virtually any target sequence by providing a suitable guide RNA, Cas9 technology is still limited with respect to the sequences that can be targeted by a strict requirement for a protospacer-adjacent motif (PAM), typically of the nucleotide sequence 5′-NGG-3′, that must be present immediately adjacent to the 3′-end of the targeted DNA sequence in order for the Cas9 protein to bind and act upon the target sequence. The PAM requirement thus limits the sequences that can be efficiently targeted by Cas9 proteins.
Significantly, 80-90% of protein mutations responsible for human disease arise from the substitution, deletion, or insertion of only a single nucleotide.6 Most current strategies for single-base gene correction include engineered nucleases (which rely on the creation of double-strand breaks, DSBs, followed by stochastic, inefficient homology-directed repair, HDR), and DNA-RNA chimeric oligonucleotides.22 The latter strategy involves the design of a RNA/DNA sequence to base pair with a specific sequence in genomic DNA except at the nucleotide to be edited. The resulting mismatch is recognized by the cell's endogenous repair system and fixed, leading to a change in the sequence of either the chimera or the genome. Both of these strategies suffer from low gene editing efficiencies and unwanted gene alterations, as they are subject to both the stochasticity of HDR and the competition between HDR and non-homologous end-joining, NHEJ.23-25 HDR efficiencies vary according to the location of the target gene within the genome,26 the state of the cell cycle,27 and the type of cell/tissue.28 The development of a direct, programmable way to install a specific type of base modification at a precise location in genomic DNA with enzyme-like efficiency and no stochasticity therefore represents a powerful new approach to gene editing-based research tools and human therapeutics.
The clustered regularly interspaced short palindromic repeat (CRISPR) system is a recently discovered prokaryotic adaptive immune system10 that has been modified to enable robust and general genome engineering in a variety of organisms and cell lines.11 CRISPR-Cas (CRISPR-associated) systems are protein-RNA complexes that use an RNA molecule (sgRNA) as a guide to localize the complex to a target DNA sequence via base-pairing.12 In the natural systems, a Cas protein then acts as an endonuclease to cleave the targeted DNA sequence.13 The target DNA sequence must be both complementary to the sgRNA and also contain a “protospacer-adjacent motif” (PAM) at the 3′-end of the complementary region in order for the system to function.14 The requirement for a PAM sequence limits the use of Cas9 technology, since not all desired targeted sequences include a PAM sequence at the 3′-end and thus cannot efficiently be targeted by wild-type Cas9 proteins.
Provided herein are novel Cas9 variants that exhibit activity on target sequences that do not include the canonical PAM sequence (5′-NGG-3′, where N is any nucleotide) at the 3′-end. Such Cas9 variants are not restricted to target sequences that include the canonical PAM sequence at the 3′-end.
Among the known Cas proteins, Streptococcus pyogenes Cas9 has been mostly widely used as a tool for genome engineering.15 This Cas9 protein is a large, multi-domain protein containing two distinct nuclease domains. Point mutations can be introduced into Cas9 to abolish nuclease activity, resulting in a dead Cas9 (dCas9) that still retains its ability to bind DNA in a sgRNA-programmed manner.16In principle, such Cas9 variants, when fused to another protein or domain, can target that protein to virtually any DNA sequence simply by co-expression with an appropriate sgRNA. Thus, this disclosure also comtemplates fusion proteins comprising such Cas9 variants and a DNA modifying domain (e.g., a deaminase, a nuclease, a nickase, a recombinase, a methyltransferase, a methylase, an acetylase, an acetyltransferase, a transcriptional activator, or a transcriptional repressor domain), as well as the use of such fusion proteins in correcting mutations in a genome (e.g., the genome of a human subject) that are associated with disease, or generating mutations in a genome (e.g., the human genome) to decrease or prevent expression of a gene.
In some embodiments, any of the Cas9 proteins provided herein may be fused to a protein that has an enzymatic activity. In some embodiments, the enzymatic activity modifies a target DNA. In some embodiments, the enzymatic activity is nuclease activity, methyltransferase activity, demethylase activity, DNA repair activity, DNA damage activity, deamination activity, dismutase activity, alkylation activity, depurination activity, oxidation activity, pyrimidine dimer forming activity, integrase activity, transposase activity, recombinase activity, polymerase activity, ligase activity, helicase activity, photolyase activity or glycosylase activity. In some cases, the enzymatic activity is nuclease activity. In some cases, the nuclease activity introduces a double strand break in the target DNA. In some cases, the enzymatic activity modifies a target polypeptide associated with the target DNA. In some cases, the enzymatic activity is methyltransferase activity, demethylase activity, acetyltransferase activity, deacetylase activity, kinase activity, phosphatase activity, ubiquitin ligase activity, deubiquitinating activity, adenylation activity, deadenylation activity, SUMOylating activity, deSUMOylating activity, ribosylation activity, deribosylation activity, myristoylation activity or demyristoylation activity. In some cases, the target polypeptide is a histone and the enzymatic activity is methyltransferase activity, demethylase activity, acetyltransferase activity, deacetylase activity, kinase activity, phosphatase activity, ubiquitin ligase activity or deubiquitinating activity.
In some embodiments, any of the Cas9 proteins provided herein may be fused to a protein that has an enzymatic activity. In some embodiments, the enzymatic activity modifies a polypeptide associated with DNA (e.g. a histone). In some embodiments, the enzymatic activity is methyltransferase activity, demethylase activity, acetyltransferase activity, deacetylase activity, kinase activity, phosphatase activity, ubiquitin ligase activity (i.e., ubiquitination activity), deubiquitinating activity, adenylation activity, deadenylation activity, SUMOylating activity, deSUMOylating activity, ribosylation activity, deribosylation activity, myristoylation activity, demyristoylation activity glycosylation activity (e.g., from O-GlcNAc transferase) or deglycosylation activity. The enzymatic activities listed herein catalyze covalent modifications to proteins. Such modifications are known in the art to alter the stability or activity of the target protein (e.g., phosphorylation due to kinase activity can stimulate or silence protein activity depending on the target protein). Of particular interest as protein targets are histones. Histone proteins are known in the art to bind DNA and form complexes known as nucleosomes. Histones can be modified (e.g., by methylation, acetylation, ubuitination, phosphorylation) to elicit structural changes in the surrounding DNA, thus controlling the accessibility of potentially large portions of DNA to interacting factors such as transcription factors, polymerases and the like. A single histone can be modified in many different ways and in many different combinations (e.g., trimethylation of lysine 27 of histone 3, H3K27, is associated with DNA regions of repressed transcription while trimethylation of lysine 4 of histone 3, H3K4, is associated with DNA regions of active transcription). Thus, a site-directed modifying polypeptide with histone-modifying activity finds use in the site specific control of DNA structure and can be used to alter the histone modification pattern in a selected region of target DNA. Such methods find use in both research and clinical applications.
In some embodiments, the deaminase domain catalyzes the removal of an amine group from a molecule. In further embodiments, cytidine deaminase domains deaminate cytosine to yield uracil. In other embodiments, the nuclease domain has enzymatic activity and may cleave phosphodiester bonds between the nucleotide subunits of nucleic acids. In some embodiments, recombinase domains, which recombine specific sequences of DNA, may be used to manipulate the structure of genomes and to control gene expression. In further embodiments, methylase domains may be utilized to methylate their respective substrates, while acetylase domains may be used to acetylate their respective substrates. In other embodiments, acetyltransferase domains may be used to transfer an acetyl group. Examples of acetyltransferase molecules include, but are not limited to, histone acetyltransferases (e.g., CBP histone acetyltransferase), choline acetyltransferase, chloramphenicol acetytransferase, serotonic N-acetyltransferase, NatA acetyltransferase, and NatB acetyltransferase. The disclosure also contemplates transcriptional activator and transcriptional repressor domains. Transcriptional activator domains are regions of a transcription factor which may activate transcription from a promoter through an interaction or multiple interactions with a DNA binding domain, general transcription factors, and RNA polymerase. Transcriptional repressor domains are regions of a transcription factor which may repress transcription from a protomer through an interaction or multiple interactions with a DNA binding domain, general transcription factors, and RNA polymerase.
The potential of the Cas9 system for genome engineering is immense. Its unique ability to bring proteins to specific sites in a genome programmed by the sgRNA can be developed into a variety of site-specific genome engineering tools beyond nucleases, including transcriptional activators, transcriptional repressors, histone-modifying proteins, integrases, deaminases, and recombinases.11 Some of these potential applications have recently been implemented through dCas9 fusions with transcriptional activators to afford RNA-guided transcriptional activators,17,18 transcriptional repressors,16,19,20 and chromatin modification enzymes.21 Simple co-expression of these fusions with a variety of sgRNAs results in specific expression of the target genes. These seminal studies have paved the way for the design and construction of readily programmable sequence-specific effectors for the precise manipulation of genomes.
Some aspects of this disclosure provide strategies, systems, proteins, nucleic acids, compositions, cells, reagents, methods, and kits that are useful for the targeted binding, editing, and/or cleaving of nucleic acids, including editing a single site within a subject's genome, e.g., a human subject's genome. In some embodiments, recombinant Cas9 proteins are provided that comprise at least one, at least two, at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, or at least ten mutations as compared to a naturally occurring Cas9 protein, and that exhibit activity on target sequences that do not include the canonical PAM (5′-NGG-3′, where N is any nucleotide) at the 3′-end. Examples of such Cas9 protein mutations are given in Tables 3, 5, 8, and 9. In some embodiments, fusion proteins of Cas9 and nucleic acid editing enzymes or enzymatic domains, e.g., deaminase domains, are provided. In some embodiments, methods for targeted nucleic acid binding, editing, and/or cleaving are provided. In some embodiments, reagents and kits for the generation of targeted nucleic acid binding, editing, and/or cleaving proteins, e.g., fusion proteins of Cas9 variants and nucleic acid editing enzymes or domains, are provided.
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of Cas9 as provided by any of the sequences set forth in SEQ ID NOs: 9-262, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of S. pyogenes Cas9 having the amino acid sequence provided in SEQ ID NO: 9, or in a corresponding amino acid residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the recombinant Cas9 protein comprises a RuvC and an HNH domain. In some embodiments, the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein. In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of X262T, X294R, X409I, X480K, X543D, X694I, and X1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid. In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of A262T, K294R, S409I, E480K, E543D, M694I, and E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
Other aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of Cas9 as provided by any of the sequences set forth in SEQ ID NOs: 10-262, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 262, 267, 294, 405, 409, 480, 543, 694, 1219, 1224, 1256, and 1362 of the amino acid sequence provided in SEQ ID NO: 9, or in a corresponding amino acid residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262; and wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein. In some embodiments, the Cas9 protein comprises a RuvC and an HNH domain. In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of X262T, X267G, X294R, X405I, X409I, X480K, X543D, X694I, X1219V, X1224K, and X1256K of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid. In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of A262T, S267G, K294R, F405I, S409I, E480K, E543D, M694I, E1219V, N1224K, and Q1256K of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in in SEQ ID NOs: 10-262.
It should be appreciated that any of the amino acid mutations described herein, (e.g., A262T) from a first amino acid residue (e.g., A) to a second amino acid residue (e.g., T) may also include mutations from the first amino acid residue to an amino acid residue that is similar to (e.g., conserved) the second amino acid residue. For example, a mutation of an alanine to a threonine (e.g., a A262T mutation) may also be a mutation from an alanine to an amino acid that is similar in size and chemical properties to a threonine, for example, serine. Additional similar amino acid pairs include, but are not limited to, the following: phenylalanine and tyrosine; asparagine and glutamine; methionine and cysteine; aspartic acid and glutamic acid; and arginine and lysine. The skilled artisan would recognize that such conservative amino acid substitutions will likely have minor effects on protein structure and are likely to be well tolerated without compromising function. In some embodiments, any of the amino acid mutations provided herein from one amino acid to a threonine may be an amino acid mutation to a serine. In some embodiments, any of the amino acid mutations provided herein from one amino acid to an arginine may be an amino acid mutation to a lysine. In some embodiments, any of the amino acid mutations provided herein from one amino acid to an isoleucine may be an amino acid mutation to an alanine, valine, methionine, or leucine. In some embodiments, any of the amino acid mutations provided herein from one amino acid to a lysine may be an amino acid mutation to an arginine. In some embodiments, any of the amino acid mutations provided herein from one amino acid to an aspartic acid may be an amino acid mutation to a glutamic acid or asparagine. In some embodiments, any of the amino acid mutations provided herein from one amino acid to a valine may be an amino acid mutation to an alanine, isoleucine, methionine, or leucine. In some embodiments, any of the amino acid mutations provided herein from one amino acid to a glycine may be an amino acid mutation to an alanine. It should be appreciated, however, that additional conserved amino acid residues would be recognized by the skilled artisan and any of the amino acid mutations to other conserved amino acid residues are also within the scope of this disclosure.
In some embodiments, the Cas9 protein is a Cas9 domain of a fusion protein. In some embodiments, the amino acid sequence of the Cas9 protein comprises an X1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid. In some embodiments, the mutation is X1219A, X1219I, X1219M, or X1219L.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an E1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the mutation is E1219A, E1219I, E1219M or E1219L.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an X480K mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid. In some embodiments, the mutation is X480R.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an E480K mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the mutation is E480R.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an X543D mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid. In some embodiments, the mutation is X543N.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an E543D mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the mutation is E543N.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X480K, X543D, and X1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X262T, X409I, X480K, X543D, X694I, and X1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X294R, X480K, X543D, X1219V, X1256K, and X1362P of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X294R, X480K, X543D, X1219V, and X1256K of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X267G, X294R, X480K, X543D, X1219V, X1224K, and X1256K of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X262T, X405I, X409I, X480K, X543D, X694I, and X1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations E480K, E543D, and E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations A262T, S409I, E480K, E543D, M694I, and E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations K294R, E480K, E543D, E1219V, Q1256K, and L1362P of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations K294R, E480K, E543D, E1219V, and Q1256K of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations S267G, K294R, E480K, E543D, E1219V, N1224K, and Q1256K of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations A262T, F405I, S409I, E480K, E543D, M694I, and E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
The HNH nuclease domain of Cas9 functions to cleave the DNA strand complementary to the guide RNA (gRNA). Its active site consists of a ββα-metal fold, and its histidine 840 activates a water molecule to attack the scissile phosphate, which is more electrophilic due to coordination with a magnesium ion, resulting in cleavage of the the 3′-5′ phosphate bond. In some embodiments, the amino acid sequence of the HNH domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the HNH domain of any of SEQ ID NOs: 9-262. In some embodiments, the amino acid sequence of the HNH domain is identical to the amino acid sequence of the HNH domain of any of SEQ ID NOs: 9-262.
The RuvC domain of Cas9 cleaves the non-target DNA strand. It is encoded by sequentially disparate sites which interact in the tertiary structure to form the RuvC cleavage domain and consists of an RNase H fold structure. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 9-262. In some embodiments, the amino acid sequence of the RuvC domain is identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 9-262.
In some embodiments, the Cas9 protein comprises one or more mutations that affects (e.g., inhibits) the ability of Cas9 to cleave one or both strands of a DNA duplex. In some embodiments, the Cas9 protein comprises a D10A and/or a H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises a D10X1 and/or a H840X2 mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X1 is any amino acid except for D, and X2 is any amino acid except for H. In some embodiments, the Cas9 protein comprises an D10A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises an H at amino acid residue 840 of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises an H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises a D at amino acid residue 10 of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the Cas9 protein of the present disclosure exhibits activity, for example, increased binding, on a target sequence that does not include the canonical PAM sequence (5′-NGG-3′) at its 3′-end as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9.
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9 wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of amino acid residues 262, 267, 294, 405, 409, 480, 543, 694, 1219, 1224, 1256, and 1362 of the amino acid sequence provided in SEQ ID NO: 9, wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein, and wherein the recombinant Cas9 protein exhibits increased activity on a target sequence that does not comprise the canonical PAM sequence (5′-NGG-3′) at its 3′ end as compared to Streptococcus pyogenes Cas9 as provided in SEQ ID NO: 9. In some embodiments, the Streptococcus pyogenes Cas9 comprises a RuvC and an HNH domain. In other embodiments, the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of the amino acid sequence provided in SEQ ID NO: 9
As one example, the Cas9 protein may exhibit increased binding to the target sequence, may exhibit increased nuclease activity at the target sequence, or may exhibit an increase in other activities, depending on whether the Cas 9 protein is fused to an additional domain, such as an enzyme that has enzymatic activity. In some embodiments, the enzymatic activity modifies a target DNA. In some embodiments, the enzymatic activity is nuclease activity, methyltransferase activity, demethylase activity, DNA repair activity, DNA damage activity, deamination activity, dismutase activity, alkylation activity, depurination activity, oxidation activity, pyrimidine dimer forming activity, integrase activity, transposase activity, recombinase activity, polymerase activity, ligase activity, helicase activity, photolyase activity or glycosylase activity. In some cases, the enzymatic activity is nuclease activity. In some cases, the nuclease activity introduces a double strand break in the target DNA. In some cases, the enzymatic activity modifies a target polypeptide associated with the target DNA. In some cases, the enzymatic activity is methyltransferase activity, demethylase activity, acetyltransferase activity, deacetylase activity, kinase activity, phosphatase activity, ubiquitin ligase activity, deubiquitinating activity, adenylation activity, deadenylation activity, SUMOylating activity, deSUMOylating activity, ribosylation activity, deribosylation activity, myristoylation activity or demyristoylation activity. In some cases, the target polypeptide is a histone and the enzymatic activity is methyltransferase activity, demethylase activity, acetyltransferase activity, deacetylase activity, kinase activity, phosphatase activity, ubiquitin ligase activity or deubiquitinating activity.
In some embodiments, any of the Cas9 protein is fused to a protein that has an enzymatic activity. In some embodiments, the enzymatic activity modifies a polypeptide associated with DNA (e.g. a histone). In some embodiments, the enzymatic activity is methyltransferase activity, demethylase activity, acetyltransferase activity, deacetylase activity, kinase activity, phosphatase activity, ubiquitin ligase activity (i.e., ubiquitination activity), deubiquitinating activity, adenylation activity, deadenylation activity, SUMOylating activity, deSUMOylating activity, ribosylation activity, deribosylation activity, myristoylation activity, demyristoylation activity glycosylation activity (e.g., from O-GlcNAc transferase) or deglycosylation activity. The enzymatic activities listed herein catalyze covalent modifications to proteins. Such modifications are known in the art to alter the stability or activity of the target protein (e.g., phosphorylation due to kinase activity can stimulate or silence protein activity depending on the target protein). Of particular interest as protein targets are histones. Histone proteins are known in the art to bind DNA and form complexes known as nucleosomes. Histones can be modified (e.g., by methylation, acetylation, ubuitination, phosphorylation) to elicit structural changes in the surrounding DNA, thus controlling the accessibility of potentially large portions of DNA to interacting factors such as transcription factors, polymerases and the like. A single histone can be modified in many different ways and in many different combinations (e.g., trimethylation of lysine 27 of histone 3, H3K27, is associated with DNA regions of repressed transcription while trimethylation of lysine 4 of histone 3, H3K4, is associated with DNA regions of active transcription). Thus, a site-directed modifying polypeptide with histone-modifying activity finds use in the site specific control of DNA structure and can be used to alter the histone modification pattern in a selected region of target DNA. Such methods find use in both research and clinical applications.
In some embodiments, the Cas9 protein exhibits activity on a target sequence having a 3′ end that is not directly adjacent to, or does not have the canonical PAM sequence (5′-NGG-3′), that is at least 2-fold, at least 3-fold, at least 5-fold, at least 10-fold, at least 50-fold, at least 100-fold, at least 500-fold, at least 1,000-fold, at least 5,000-fold, at least 10,000-fold, at least 50,000-fold, at least 100,000-fold, at least 500,000-fold, or at least 1,000,000-fold increased as compared to the activity of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9 on the same target sequence.
In some embodiments, the 3′-end of the target sequence is directly adjacent to an AGC, GAG, TTT, GTG, CAA CAC, GAT, TAA, ACG, CGA, or CGT sequence.
In some embodiments, the Cas9 protein activity is measured by a nuclease assay or a nucleic acid binding assay, which are known in the art and would be apparent to the skilled artisan. As provided herein, the Cas9 protein may be fused to one or more domains that confer an activity to the protein, such as a nucleic acid editing activity (e.g., deaminase activity or transcriptional activation activity), which may be measured (e.g., by a deaminase assay or transcriptional activation assay). In some embodiments, the Cas9 protein is fused to a deaminase domain and its activity may be measured using a deaminase assay. In some embodiments, the Cas9 protein is fused to a transcriptional activation domain and its activity may be measured using a transcriptional activation assay, for example, reporter activation assay where the reporter, e.g., GFP or luciferase, among others, is expressed in response to Cas9 binding to a target sequence.
In some embodiments, the amino acid sequence of the Cas9 protein comprises any of the mutations provided herein. For example, in some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of X262T, X267G, X294R, X405I, X409I, X480K, X543D, X694I, X1219V, X1224K, X1256K, and X1362P of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid. In other embodiments, the mutations may be A262T, S267G, K294R, F405I, S409I, E480K, E543D, M694I, E1219V, N1224K, Q1256K, and L1362P of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises any of the mutations provided herein. For example, in some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of X262T, X294R, X409I, X480K, X543D, X694I, and X1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid. In other embodiments, the mutations may be A262T, K294R, S409I, E480K, E543D, M694I, or E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an X1219V mutation or an E1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an X480K mutation or an E480K mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an X543D mutation or a E543D mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 comprises the mutations X480K, X543D, and X1219V; or the mutations E480K, E543D, and E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 comprises the mutations X262T, X409I, X480K, X543D, X694I, and X1219V; or the mutations A262T, S409I, E480K, E543D, M694I, and E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X294R, X480K, X543D, X1219V, X1256K, and X1362P; or the mutations K294R, E480K, E543D, E1219V, Q1256K, and L1362P of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X294R, X480K, X543D, X1219V, and X1256K, or mutations K294R, E480K, E543D, E1219V, and Q1256K of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X267G, X294R, X480K, X543D, X1219V, X1224K, and X1256K; or the mutations S267G, K294R, E480K, E543DE1219V, N1224K, and Q1256K of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the mutations X262T, X405I, X409I, X480K, X543D, X694I, and X1219V; or the mutations A262T, F405I, S409I, E480K, E543D, M694I, and E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid.
In some embodiments, the amino acid sequence of the HNH domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the HNH domain of any of SEQ ID NOs: 9-262. In some embodiments, the amino acid sequence of the HNH domain is identical to the amino acid sequence of any of the HNH domains of SEQ ID NOs: 9-262.
In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 9-262. In some embodiments, the amino acid sequence of the RuvC domain is identical to the amino acid sequence of any of the RuvC domains of SEQ ID NOs: 9-262.
In some embodiments, the Cas9 protein comprises at D10A and/or a H840A mutation in the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises a D10X1 and/or a H840X2 mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X1 is any amino acid except for D, and wherein X2 is any amino acid except for H. In some embodiments, the Cas9 protein comprises an D10A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises an H at amino acid residue 840 of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises an H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises an D at amino acid residue 10 of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
Some aspects of this disclosure provide fusion proteins comprising a Cas9 protein as provided herein that is fused to a second protein, thus forming a fusion protein. In some embodiments, the second protein is fused to the N-terminus of the Cas9 protein. In some embodiments, the second protein is fused to the C-terminus of the Cas9 protein. In some embodiments, the Cas9 domain and the effector domain are fused via a linker. The linker may be as simple as a covalent bond, or it may be a polymeric linker many atoms in length. In certain embodiments, the linker is a polypeptide or based on amino acids. In other embodiments, the linker is not peptide-like. In certain embodiments, the linker is a covalent bond (e.g., a carbon-carbon bond, disulfide bond, carbon-heteroatom bond, etc.). In certain embodiments, the linker is a carbon-nitrogen bond of an amide linkage. In certain embodiments, the linker is a cyclic or acyclic, substituted or unsubstituted, branched or unbranched aliphatic or heteroaliphatic linker. In certain embodiments, the linker is polymeric (e.g., polyethylene, polyethylene glycol, polyamide, polyester, etc.). In certain embodiments, the linker comprises a monomer, dimer, or polymer of aminoalkanoic acid. In certain embodiments, the linker comprises an aminoalkanoic acid (e.g., glycine, ethanoic acid, alanine, beta-alanine, 3-aminopropanoic acid, 4-aminobutanoic acid, 5-pentanoic acid, etc.). In certain embodiments, the linker comprises a monomer, dimer, or polymer of aminohexanoic acid (Ahx). In certain embodiments, the linker is based on a carbocyclic moiety (e.g., cyclopentane, cyclohexane). In other embodiments, the linker comprises a polyethylene glycol moiety (PEG). In other embodiments, the linker comprises amino acids. In certain embodiments, the linker comprises a peptide. In certain embodiments, the linker comprises an aryl or heteroaryl moiety. In certain embodiments, the linker is based on a phenyl ring. The linker may included functionalized moieties to facilitate attachment of a nucleophile (e.g., thiol, amino) from the peptide to the linker. Any electrophile may be used as part of the linker. Exemplary electrophiles include, but are not limited to, activated esters, activated amides, Michael acceptors, alkyl halides, aryl halides, acyl halides, and isothiocyanates.
In some embodiments, the linker comprises a chemical group or molecule linking two molecules or moieties, e.g., two domains of a fusion protein, such as, for example, a nuclease-inactive Cas9 domain and a effector domain (e.g., a deaminase domain). In some embodiments, the linker comprises one or more amino acid residues. For example, the linker may comprise at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 25, 30, 35, 40, 45, 50, or more amino acid residues. In some embodiments, the linker is 3, 9, 16, or 21 amino acids in length. In some embodiments, the linker comprises a (GGGGS)n (SEQ ID NO: 5), a (G)n(SEQ ID NO: 5087), an (EAAAK)n (SEQ ID NO: 6), a (GGS)n (SEQ ID NO: 5088), an SGSETPGTSESATPES (SEQ ID NO: 7) (also referred to as XTEN), or an (XP)n (SEQ ID NO: 5089) motif, or a combination of any of these, wherein n is independently an integer between 1 and 30. In some embodiments, wherein the linker comprises a (GGS)3 (SEQ ID NO: 5088) motif or a SGSETPGTSESATPES (SEQ ID NO: 7) (XTEN) motif.
Some aspects of this disclosure provide fusion proteins comprising a Cas9 protein as provided herein that is fused to a second protein, thus forming a fusion protein. In some embodiments, the second protein is fused to the N-terminus of the Cas9 protein. In some embodiments, the second protein is fused to the C-terminus of the Cas9 protein. In some embodiments, the Cas9 domain and the effector domain are fused via a nuclear localization sequence (NLS), for example a NLS comprising the amino acid sequence PKKKRKV (SEQ ID NO: 299), MDSLLMNRRKFLYQFKNVRWAKGRRETYLC (SEQ ID NO: 300), or SPKKKRKVEAS (SEQ ID NO: 284). In some embodiments, a NLS may be combined with any of the linkers listed above.
In some embodiments, the effector domain comprises an enzymatic domain. In some embodiments, the effector domain comprises a nuclease, a nickase, a recombinase, a deaminase, a methyltransferase, a methylase, an acetylase, an acetyltransferase, a transcriptional activator, or a transcriptional repressor domain, which may have nuclease activity, nickase activity, recombinase activity, deaminase activity, methyltransferase activity, methylase activity, acetylase activity, acetyltransferase activity transcriptional activation activity or transcriptional repression activity, respectively. In some embodiments, the effector domain is a effector domain. In some embodiments, the effector domain is a deaminase domain. In some embodiments, the deaminase is a cytosine deaminase or a cytidine deaminase. In some embodiments, the deaminase is an apolipoprotein B mRNA-editing complex (APOBEC) family deaminase. In some embodiments, the deaminase is an APOBEC1 deaminase. In some embodiments, the deaminase is an APOBEC2 deaminase. In some embodiments, the deaminase is an APOBEC3 deaminase. In some embodiments, the deaminase is an APOBEC3A deaminase. In some embodiments, the deaminase is an APOBEC3D deaminase. In some embodiments, the deaminase is an APOBEC3E deaminase. In some embodiments, the deaminase is an APOBEC3F deaminase. In some embodiments, the deaminase is an APOBEC3G deaminase. In some embodiments, the deaminase is an APOBEC3H deaminase. In some embodiments, the deaminase is an APOBEC4 deaminase. In some embodiments, the deaminase is an activation-induced deaminase (AID). In some embodiments, the effector domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the deaminase domain of any one of SEQ ID NOs: 263-281. In some embodiments, the deaminase is a cytidine deaminase. In some embodiments, the deaminase is an apolipoprotein B mRNA-editing complex (APOBEC) family deaminase. In some embodiments, the deaminase is an APOBEC1 family deaminase. In some embodiments, the deaminase is an activation-induced cytidine deaminase (AID). In some embodiments, the deaminase is an ACF1/ASE deaminase. In some embodiments, the deaminase is an adenosine deaminase. In some embodiments, the deaminase is an ADAT family deaminase.
Some aspects of this disclosure provide fusion proteins comprising a Cas9 protein fused to a effector domain, e.g., a deaminase, and a uracil glycosylase inhibitor (UGI). Some aspects of this disclosure are based on the recognition that such fusion proteins may exhibit an increased nucleic acid editing efficiency as compared to fusion proteins not comprising an UGI domain. Domains such as the deaminase domains and UGI domains have been described and are within the scope of this disclosure. For example domains such as deaminase domains and UGI domains have been described in Provisional Application Nos.: 62/245,828, filed Oct. 23, 2015, 62/279,346 filed Jan. 15, 2016, 62/311,763 filed Mar. 22, 2016, 62/322,178 filed Apr. 13, 2016, 62/357,352 filed Jun. 30, 2016, 62/370,700 filed Aug. 3, 2016, 62/398,490 filed Sep. 22, 2016, and 62/408,686 filed Oct. 14, 2016; the entire contents of each is incorporated by reference herein. It should be appreciated that the deaminase domains and UGI domains described in the foregoing references are within the scope of this disclosure and may be fused with any of the Cas9 proteins provided herein.
In some embodiments, the effector domain of the fusion protein is a nuclease domain. In some embodiments, the nuclease domain is a FokI DNA cleavage domain. In some embodiments, the fusion protein dimerizes. In certain embodiments, the dimer of the fusion protein is active. For example, two Fok1 DNA cleavage domains may dimerize to cleave a nucleic acid.
In some embodiments, the Cas9 protein is fused to a second Cas9 protein. In some embodiments, the second Cas9 protein is the Cas9 protein of any one of claims 1-345. In some embodiments, the second Cas9 protein is fused to the N-terminus of the fusion protein. In some embodiments, the second Cas9 protein is fused to the C-terminus of the fusion protein. In some embodiments, the Cas9 protein and the second Cas9 protein are fused via a second linker. In some embodiments, the second linker comprises a (GGGGS)n (SEQ ID NO: 5), a (G)n (SEQ ID NO: 5087), an (EAAAK)n (SEQ ID NO: 6), a (GGS)n(SEQ ID NO: 5088), an SGSETPGTSESATPES (SEQ ID NO: 7), or an (XP)n (SEQ ID NO: 5089) motif, or a combination of any of these, wherein n is independently an integer between 1 and 30. In some embodiments, the second linker comprises a (GGS)3 (SEQ ID NO: 5088) motif.
Some aspects of this disclosure provide complexes comprising a Cas9 protein, or a Cas9 fusion protein as provided herein, and a guide RNA bound to the Cas9 protein, or the Cas9 fusion protein.
In some embodiments, the target sequence is a DNA sequence. In some embodiments, the target sequence is a sequence in the genome of a mammal. In some embodiments, the target sequence is a sequence in the genome of a human. In some embodiments, the 3′-end of the target sequence is not immediately adjacent to the canonical PAM sequence (5′-NGG-3′).
Some aspects of this disclosure provide methods of using the Cas9 proteins, fusion proteins, or complexes provided herein. For example, some aspects of this disclosure provide methods comprising contacting a DNA molecule (a) with a Cas9 protein or a fusion protein as provided herein and a guide RNA, wherein the guide RNA is about 15-100 nucleotides long and comprises a sequence of at least 10 contiguous nucleotides that is complementary to a target sequence; or (b) with a Cas9 protein, a Cas9 fusion protein, or a Cas9 protein or fusion protein complex with a gRNA as provided herein. In some embodiments, the 3′-end of the target sequence is not immediately adjacent to the canonical PAM sequence (5′-NGG-3′). In some embodiments, the 3′-end of the target sequence is immediately adjacent to an AGC, GAG, TTT, GTG, or CAA sequence. In some embodiments, the target DNA sequence comprises a sequence associated with a disease or disorder. In some embodiments, the target DNA sequence comprises a point mutation associated with a disease or disorder. In some embodiments, the activity of the Cas9 protein, the Cas9 fusion protein, or the complex results in correction of the point mutation. In some embodiments, the step of contacting is performed in vivo in a subject.
Some aspects of this disclosure provide kits comprising a nucleic acid construct, comprising (a) a nucleotide sequence encoding a Cas9 protein or a Cas9 fusion protein as provided herein; and (b) a heterologous promoter that drives expression of the sequence of (a). In some embodiments, the kit further comprises an expression construct encoding a guide RNA backbone, wherein the construct comprises a cloning site positioned to allow the cloning of a nucleic acid sequence identical or complementary to a target sequence into the guide RNA backbone.
Some aspects of this disclosure provide polynucleotides encoding any of the Cas9 proteins, Cas9 fusion proteins, or guide RNA bound to the Cas9 protein or Cas9 fusion protein provided herein. Some aspects of this disclosure provide vectors comprising such polynucleotides. In some embodiments, the vector comprises a heterologous promoter driving expression of the polynucleotide.
Some aspects of this disclosure provide cells comprising any of the Cas9 proteins, fusion proteins, nucleic acid molecules, and/or a vectors as provided herein.
The summary above is meant to illustrate, in a non-limiting manner, some of the embodiments, advantages, features, and uses of the technology disclosed herein. Other embodiments, advantages, features, and uses of the technology disclosed herein will be apparent from the Detailed Description, the Drawings, the Examples, and the Claims.
As used herein and in the claims, the singular forms “a,” “an,” and “the” include the singular and the plural reference unless the context clearly indicates otherwise. Thus, for example, a reference to “an agent” includes a single agent and a plurality of such agents.
The term “Cas9” or “Cas9 nuclease” refers to an RNA-guided nuclease comprising a Cas9 protein, or a fragment thereof (e.g., a protein comprising an active or inactive DNA cleavage domain of Cas9, and/or the gRNA binding domain of Cas9). A Cas9 nuclease is also referred to sometimes as a casn1 nuclease or a CRISPR (clustered regularly interspaced short palindromic repeat)-associated nuclease. CRISPR is an adaptive immune system that provides protection against mobile genetic elements (viruses, transposable elements and conjugative plasmids). CRISPR clusters contain spacers, sequences complementary to antecedent mobile elements, and target invading nucleic acids. CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA). In type II CRISPR systems correct processing of pre-crRNA requires a trans-encoded small RNA (tracrRNA), endogenous ribonuclease 3 (rnc) and a Cas9 protein. The tracrRNA serves as a guide for ribonuclease 3-aided processing of pre-crRNA. Subsequently, Cas9/crRNA/tracrRNA endonucleolytically cleaves linear or circular dsDNA target complementary to the spacer. The target strand not complementary to crRNA is first cut endonucleolytically, then trimmed 3′-5′ exonucleolytically. In nature, DNA-binding and cleavage typically requires protein and both RNAs. However, single guide RNAs (“sgRNA”, or simply “gNRA”) can be engineered so as to incorporate aspects of both the crRNA and tracrRNA into a single RNA species. See, e.g., Jinek M., Chylinski K., Fonfara I., Hauer M., Doudna J. A., Charpentier E. Science 337:816-821(2012), the entire contents of which are hereby incorporated by reference. Cas9 recognizes a short motif in the CRISPR repeat sequences (the PAM or protospacer adjacent motif) to help distinguish self versus non-self. Cas9 nuclease sequences and structures are well known to those of skill in the art (see, e.g., “Complete genome sequence of an M1 strain of Streptococcus pyogenes.” Ferretti et al., J. J., McShan W. M., Ajdic D. J., Savic D. J., Savic G., Lyon K., Primeaux C., Sezate S., Suvorov A. N., Kenton S., Lai H. S., Lin S. P., Qian Y., Jia H. G., Najar F. Z., Ren Q., Zhu H., Song L., White J., Yuan X., Clifton S. W., Roe B. A., McLaughlin R. E., Proc. Natl. Acad. Sci. U.S.A. 98:4658-4663(2001); “CRISPR RNA maturation by trans-encoded small RNA and host factor RNase III.” Deltcheva E., Chylinski K., Sharma C. M., Gonzales K., Chao Y., Pirzada Z. A., Eckert M. R., Vogel J., Charpentier E., Nature 471:602-607(2011); and “A programmable dual-RNA-guided DNA endonuclease in adaptive bacterial immunity.” Jinek M., Chylinski K., Fonfara I., Hauer M., Doudna J. A., Charpentier E. Science 337:816-821(2012), the entire contents of each of which are incorporated herein by reference). Cas9 orthologs have been described in various species, including, but not limited to, S. pyogenes and S. thermophilus. Additional suitable Cas9 nucleases and sequences will be apparent to those of skill in the art based on this disclosure, and such Cas9 nucleases and sequences include Cas9 sequences from the organisms and loci disclosed in Chylinski, Rhun, and Charpentier, “The tracrRNA and Cas9 families of type II CRISPR-Cas immunity systems” (2013) RNA Biology 10:5, 726-737; the entire contents of which are incorporated herein by reference. In some embodiments, a Cas9 nuclease has an inactive (e.g., an inactivated) DNA cleavage domain.
A nuclease-inactivated Cas9 protein may interchangeably be referred to as a “dCas9” protein (for nuclease-“dead” Cas9). Methods for generating a Cas9 having an inactive DNA cleavage domain are known (See, e.g., Jinek et al., Science. 337:816-821(2012); Qi et al., “Repurposing CRISPR as an RNA-Guided Platform for Sequence-Specific Control of Gene Expression” (2013) Cell. 28; 152(5):1173-83, the entire contents of each of which are incorporated herein by reference). For example, the DNA cleavage domain of Cas9 is known to include two subdomains, the HNH nuclease subdomain and the RuvC1 subdomain. The HNH subdomain cleaves the strand complementary to the gRNA, whereas the RuvC1 subdomain cleaves the non-complementary strand. Mutations within these subdomains can silence the nuclease activity of Cas9. For example, the mutations D10A and H840A completely inactivate the nuclease activity of S. pyogenes Cas9 (Jinek et al., Science. 337:816-821(2012); Qi et al., Cell. 28; 152(5):1173-83 (2013).
In some embodiments, proteins comprising fragments of Cas9 are provided. For example, in some embodiments, a protein comprises one of two Cas9 domains: (1) the gRNA binding domain of Cas9; or (2) the DNA cleavage domain of Cas9. In some embodiments, proteins comprising Cas9 or fragments thereof are referred to as “Cas9 variants.” A Cas9 variant shares homology to Cas9. For example a Cas9 variant is at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 96% identical, at least about 97% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% to wild type Cas9. In some embodiments, the Cas9 variant comprises a fragment of Cas9 (e.g., a gRNA binding domain or a DNA-cleavage domain), such that the fragment is at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 96% identical, at least about 97% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% to the corresponding fragment of wild type Cas9. In some embodiments, wild type Cas9 corresponds to Cas9 from Streptococcus pyogenes (NCBI Reference Sequence: NC_017053.1, SEQ ID NO:1 (nucleotide); SEQ ID NO:2 (amino acid)).
ALLFGSGETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFF
GILQTVKIVDELVKVMGHKPENIVIEMARENQTTQKGQKNSRERMKRIE
EGIKELGSQILKEHPVENTQLQNEKLYLYYLQNGRDMYVDQELDINRLS
DYDVDHIVPQSFIKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNYW
RQLLNAKLITQRKFDNLTKAERGGLSELDKAGFIKRQLVETRQITKHVA
QILDSRMNTKYDENDKLIREVKVITLKSKLVSDERKDFQFYKVREINNY
HHAHDAYLNAVVGTALIKKYPKLESEFVYGDYKVYDVRKMIAKSEQEIG
KATAKYFFYSNIMNFEKTEITLANGEIRKRPLIETNGETGEIVWDKGRD
FATVRKVLSMPQVNIVKKTEVQTGGFSKESILPKRNSDKLIARKKDWDP
In some embodiments, wild type Cas9 corresponds to, or comprises SEQ ID NO:3 (nucleotide) and/or SEQ ID NO: 4 (amino acid):
ALLFDSGETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFF
GILQTVKVVDELVKVMGRHKPENIVIEMARENQTTQKGQKNSRERMKRI
EEGIKELGSQILKEHPVENTQLQNEKLYLYYLQNGRDMYVDQELDINRL
SDYDVDHIVPQSFLKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNY
WRQLLNAKLITQRKFDNLTKAERGGLSELDKAGFIKRQLVETRQITKHV
AQILDSRMNTKYDENDKLIREVKVITLKSKLVSDFRKDFQFYKVREINN
YHHAHDAYLNAVVGTALIKKYPKLESEFVYGDYKVYDVRKMIAKSEQEI
GKATAKYFFYSNIMNFFKTEITLANGEIRKRPLIETNGETGEIVWDKGR
DFATVRKVLSMPQVNIVKKTEVQTGGFSKESILPKRNSDKLIARKKDWD
In some embodiments, wild type Cas9 corresponds to Cas9 from Streptococcus pyogenes (NCBI Reference Sequence: NC_002737.2, SEQ ID NO: 282 (nucleotide); and Uniport Reference Sequence: Q99ZW2, SEQ ID NO: 9 (amino acid).
ALLFDSGETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFF
GILQTVKVVDELVKVMGRHKPENIVIEMARENQTTQKGQKNSRERMKRI
EEGIKELGSQILKEHPVENTQLQNEKLYLYYLQNGRDMYVDQELDINRL
SDYDVDHIVPQSFLKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNY
WRQLLNAKLITQRKFDNLTKAERGGLSELDKAGFIKRQLVETRQITKHV
AQILDSRMNTKYDENDKLIREVKVITLKSKLVSDERKDFQFYKVREINN
YHHAHDAYLNAVVGTALIKKYPKLESEFVYGDYKVYDVRKMIAKSEQEI
GKATAKYFFYSNIMNFFKTEITLANGEIRKRPLIEINGETGEIVWDKGR
DFATVRKVLSMPQVNIVKKTEVQTGGFSKESILPKRNSDKLIARKKDWD
In some embodiments, Cas9 refers to Cas9 from: Corynebacterium ulcerans (NCBI Refs: NC_015683.1, NC_017317.1); Corynebacterium diphtheria (NCBI Refs: NC_016782.1, NC_016786.1); Spiroplasma syrphidicola (NCBI Ref: NC_021284.1); Prevotella intermedia (NCBI Ref: NC_017861.1); Spiroplasma taiwanense (NCBI Ref: NC_021846.1); Streptococcus iniae (NCBI Ref: NC_021314.1); Belliella baltica (NCBI Ref: NC_018010.1); Psychroflexus torquisl (NCBI Ref: NC_018721.1); Streptococcus thermophilus (NCBI Ref: YP_820832.1); Listeria innocua (NCBI Ref: NP_472073.1); Campylobacter jejuni (NCBI Ref: YP_002344900.1); or Neisseria. meningitidis (NCBI Ref: YP_002342100.1) or to a Cas9 from any of the organisms listed in Example 3.
In some embodiments, dCas9 corresponds to, or comprises in part or in whole, a Cas9 amino acid sequence having one or more mutations that inactivate the Cas9 nuclease activity. For example, in some embodiments, a dCas9 domain comprises D10A and/or H840A mutation.
LQNGRDMYVDQELDINRLSDYDVDAIVPQSFLKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNYWRQLLNAK
In some embodiments, Cas9 corresponds to, or comprises in part or in whole, a Cas9 amino acid sequence having one or more mutations that alter Cas9's nuclease activity. In some embodiments, Cas9 may be a Cas9 nickase, which is a version of Cas9 that generates a single-stranded DNA break at a specific location based on a co-expressed gRNA-defined target sequence, rather than a double-strand DNA break. For example, in some embodiments, a Cas9 domain comprises D10A mutation (e.g., SEQ ID NO: 301) and/or an H840A mutation (e.g., SEQ ID NO: 302). Exemplary Cas9 nickases are shown below. However, it should be appreciated that additional Cas9 nickases that generate a single-stranded DNA break of a DNA duplex would be apparent to the skilled artisan and are within the scope of this disclosure.
ALLFDSGETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFF
GILQTVKVVDELVKVMGRHKPENIVIEMARENQTTQKGQKNSRERMKRI
EEGIKELGSQILKEHPVENTQLQNEKLYLYYLQNGRDMYVDQELDINRL
SDYDVDHIVPQSFLKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNY
WRQLLNAKLITQRKFDNLTKAERGGLSELDKAGFIKRQLVETRQITKHV
AQILDSRMNTKYDENDKLIREVKVITLKSKLVSDFRKDFQFYKVREINN
YHHAHDAYLNAVVGTALIKKYPKLESEFVYGDYKVYDVRKMIAKSEQEI
GKATAKYFFYSNIMNFFKTEITLANGEIRKRPLIETNGETGEIVWDKGR
DFATVRKVLSMPQVNIVKKTEVQTGGFSKESILPKRNSDKLIARKKDWD
ALLFDSGETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFF
GILQTVKVVDELVKVMGRHKPENIVIEMARENQTTQKGQKNSRERMKRI
EEGIKELGSQILKEHPVENTQLQNEKLYLYYLQNGRDMYVDQELDINRL
SDYDVDAIVPQSFLKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNY
WRQLLNAKLITQRKFDNLTKAERGGLSELDKAGFIKRQLVETRQITKHV
AQILDSRMNTKYDENDKLIREVKVITLKSKLVSDERKDFQFYKVREINN
YHHAHDAYLNAVVGTALIKKYPKLESEFVYGDYKVYDVRKMIAKSEQEI
GKATAKYFFYSNIMNFFKTEITLANGEIRKRPLIEINGETGEIVWDKGR
DFATVRKVLSMPQVNIVKKTEVQTGGFSKESILPKRNSDKLIARKKDWD
In other embodiments, dCas9 variants having mutations other than D10A and H840A are provided, which, e.g., result in nuclease-inactivated Cas9 (dCas9). Such mutations, by way of example, include other amino acid substitutions at D10 and H820, or other substitutions within the nuclease domains of Cas9 (e.g., substitutions in the HNH nuclease subdomain and/or the RuvC1 subdomain). In some embodiments, variants or homologues of dCas9 (e.g., variants of SEQ ID NO: 9) are provided which are at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% identical to SEQ ID NO: 9. In some embodiments, variants of dCas9 (e.g., variants of SEQ ID NO: 9) are provided having amino acid sequences which are shorter, or longer than SEQ ID NO: 9, by about 5 amino acids, by about 10 amino acids, by about 15 amino acids, by about 20 amino acids, by about 25 amino acids, by about 30 amino acids, by about 40 amino acids, by about 50 amino acids, by about 75 amino acids, by about 100 amino acids, or more.
In some embodiments, Cas9 fusion proteins as provided herein comprise the full-length amino acid sequence of a Cas9 protein, e.g., one of the sequences provided above. In other embodiments, however, fusion proteins as provided herein do not comprise a full-length Cas9 sequence, but only a fragment thereof. For example, in some embodiments, a Cas9 fusion protein provided herein comprises a Cas9 fragment, wherein the fragment binds crRNA and tracrRNA or a sgRNA, but does not comprise a functional nuclease domain, e.g., it comprises only a truncated version of a nuclease domain or no nuclease domain at all. Exemplary amino acid sequences of suitable Cas9 domains and Cas9 fragments are provided herein, and additional suitable sequences of Cas9 domains and Cas9 fragments will be apparent to those of skill in the art. In some embodiments, a Cas9 fragment is at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95% identical, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% of the amino acid length of a corresponding wild type Cas9 protein. In some embodiments, a Cas9 fragment comprises at least at least 100 amino acids in length. In some embodiments, the Cas9 fragment is at least 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550, or at least 1600 amino acids of a corresponding wild type Cas9 protein. In some embodiments, the Cas9 fragment comprises an amino acid sequence that has at least 10, at least 15, at least 20, at least 30, at least 40, at least 50, at least 60, at least 70, at least 80, at least 90, at least 100, at least 150, at least 200, at least 250, at least 300, at least 350, at least 400, at least 500, at least 600, at least 700, at least 800, at least 900, at least 1000, at least 1100, or at least 1200 identical contiguous amino acid residues of a corresponding wild type Cas9 protein.
Cas9. In some embodiments, Cas9 refers to Cas9 from: Corynebacterium ulcerans (NCBI Refs: NC_015683.1, NC_017317.1); Corynebacterium diphtheria (NCBI Refs: NC_016782.1, NC_016786.1); Spiroplasma syrphidicola (NCBI Ref: NC_021284.1); Prevotella intermedia (NCBI Ref: NC_017861.1); Spiroplasma taiwanense (NCBI Ref: NC_021846.1); Streptococcus iniae (NCBI Ref: NC_021314.1); Belliella baltica (NCBI Ref: NC_018010.1); Psychroflexus torquisl (NCBI Ref: NC_018721.1); Streptococcus thermophilus (NCBI Ref: YP_820832.1); Listeria innocua (NCBI Ref: NP_472073.1); Campylobacter jejuni (NCBI Ref: YP_002344900.1); or Neisseria. meningitidis (NCBI Ref: YP_002342100.1).
The term “deaminase” or “deaminase domain,” as used herein, refers to a protein or enzyme that catalyzes a deamination reaction. In some embodiments, the deaminase or deaminase domain is a cytidine deaminase, catalyzing the hydrolytic deamination of cytidine or deoxycytidine to uridine or deoxyuridine, respectively. In some embodiments, the deaminase or deaminase domain is a cytosine deaminase, catalyzing the hydrolytic deamination of cytosine to uracil. In some embodiments, the deaminase or deaminase domain is a naturally-occurring deaminase from an organism, such as a human, chimpanzee, gorilla, monkey, cow, dog, rat, or mouse. In some embodiments, the deaminase or deaminase domain is a variant of a naturally-occurring deaminase from an organism, that does not occur in nature. For example, in some embodiments, the deaminase or deaminase domain is at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75% at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to a naturally-occurring deaminase from an organism.
The term “effective amount,” as used herein, refers to an amount of a biologically active agent that is sufficient to elicit a desired biological response. For example, in some embodiments, an effective amount of a nuclease may refer to the amount of the nuclease that is sufficient to induce cleavage of a target site specifically bound and cleaved by the nuclease. In some embodiments, an effective amount of a fusion protein provided herein, e.g., of a fusion protein comprising a nuclease-inactive Cas9 domain and a effector domain (e.g., a deaminase domain) may refer to the amount of the fusion protein that is sufficient to induce editing of a target site specifically bound and edited by the fusion protein. As will be appreciated by the skilled artisan, the effective amount of an agent, e.g., a fusion protein, a nuclease, a deaminase, a recombinase, a hybrid protein, a protein dimer, a complex of a protein (or protein dimer) and a polynucleotide, or a polynucleotide, may vary depending on various factors such as, for example, on the desired biological response, e.g., on the specific allele, genome, or target site to be edited; on the cell or tissue being targeted; and on the agent being used.
The term “immediately adjacent” as used in the context of two nucleic acid sequences refers to two sequences that directly abut each other as part of the same nucleic acid molecule and are not separated by one or more nucleotides. Accordingly, sequences are immediately adjacent, when the nucleotide at the 3′-end of one of the sequences is directly connected to nucleotide at the 5′-end of the other sequence via a phosphodiester bond.
The term “linker,” as used herein, refers to a chemical group or a molecule linking two molecules or moieties, e.g., two domains of a fusion protein, such as, for example, a nuclease-inactive Cas9 domain and a effector domain (e.g., a deaminase domain). In some embodiments, a linker joins a gRNA binding domain of an RNA-programmable nuclease, including a Cas9 nuclease domain, and the catalytic domain of a nucleic-acid editing protein. In some embodiments, a linker joins a dCas9 and a nucleic-acid editing protein. Typically, the linker is positioned between, or flanked by, two groups, molecules, or other moieties and connected to each one via a covalent bond, thus connecting the two. In some embodiments, the linker is an amino acid or a plurality of amino acids (e.g., a peptide or protein). In some embodiments, the linker is an organic molecule, group, polymer, or chemical moiety. In some embodiments, the linker is 5-100 amino acids in length, for example, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 30-35, 35-40, 40-45, 45-50, 50-60, 60-70, 70-80, 80-90, 90-100, 100-150, or 150-200 amino acids in length. Longer or shorter linkers are also contemplated.
The term “mutation,” as used herein, refers to a substitution of a residue within a sequence, e.g., a nucleic acid or amino acid sequence, with another residue, or a deletion or insertion of one or more residues within a sequence. Mutations are typically described herein by identifying the original residue followed by the position of the residue within the sequence and by the identity of the newly substituted residue. Various methods for making the amino acid substitutions (mutations) provided herein are well known in the art, and are provided by, for example, Green and Sambrook, Molecular Cloning: A Laboratory Manual (4th ed., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. (2012)).
The terms “nucleic acid” and “nucleic acid molecule,” as used herein, refer to a compound comprising a nucleobase and an acidic moiety, e.g., a nucleoside, a nucleotide, or a polymer of nucleotides. Typically, polymeric nucleic acids, e.g., nucleic acid molecules comprising three or more nucleotides are linear molecules, in which adjacent nucleotides are linked to each other via a phosphodiester linkage. In some embodiments, “nucleic acid” refers to individual nucleic acid residues (e.g. nucleotides and/or nucleosides). In some embodiments, “nucleic acid” refers to an oligonucleotide chain comprising three or more individual nucleotide residues. As used herein, the terms “oligonucleotide” and “polynucleotide” can be used interchangeably to refer to a polymer of nucleotides (e.g., a string of at least three nucleotides). In some embodiments, “nucleic acid” encompasses RNA as well as single and/or double-stranded DNA. Nucleic acids may be naturally occurring, for example, in the context of a genome, a transcript, mRNA, tRNA, rRNA, siRNA, snRNA, a plasmid, cosmid, chromosome, chromatid, or other naturally occurring nucleic acid molecule. On the other hand, a nucleic acid molecule may be a non-naturally occurring molecule, e.g., a recombinant DNA or RNA, an artificial chromosome, an engineered genome, or fragment thereof, or a synthetic DNA, RNA, DNA/RNA hybrid, or including non-naturally occurring nucleotides or nucleosides. Furthermore, the terms “nucleic acid,” “DNA,” “RNA,” and/or similar terms include nucleic acid analogs, e.g., analogs having other than a phosphodiester backbone. Nucleic acids can be purified from natural sources, produced using recombinant expression systems and optionally purified, chemically synthesized, etc. Where appropriate, e.g., in the case of chemically synthesized molecules, nucleic acids can comprise nucleoside analogs such as analogs having chemically modified bases or sugars, and backbone modifications. A nucleic acid sequence is presented in the 5′ to 3′ direction unless otherwise indicated. In some embodiments, a nucleic acid is or comprises natural nucleosides (e.g. adenosine, thymidine, guanosine, cytidine, uridine, deoxyadenosine, deoxythymidine, deoxyguanosine, and deoxycytidine); nucleoside analogs (e.g., 2-aminoadenosine, 2-thiothymidine, inosine, pyrrolo-pyrimidine, 3-methyl adenosine, 5-methylcytidine, 2-aminoadenosine, C5-bromouridine, C5-fluorouridine, C5-iodouridine, C5-propynyl-uridine, C5-propynyl-cytidine, C5-methylcytidine, 2-aminoadenosine, 7-deazaadenosine, 7-deazaguanosine, 8-oxoadenosine, 8-oxoguanosine, 0(6)-methylguanine, and 2-thiocytidine); chemically modified bases; biologically modified bases (e.g., methylated bases); intercalated bases; modified sugars (e.g., 2′-fluororibose, ribose, 2′-deoxyribose, arabinose, and hexose); and/or modified phosphate groups (e.g., phosphorothioates and 5′-N-phosphoramidite linkages). In some embodiments, an RNA is an RNA associated with the Cas9 system. For example, the RNA may be a CRISPR RNA (crRNA), a trans-encoded small RNA (tracrRNA), a single guide RNA (sgRNA), or a guide RNA (gRNA).
The term “proliferative disease,” as used herein, refers to any disease in which cell or tissue homeostasis is disturbed in that a cell or cell population exhibits an abnormally elevated proliferation rate. Proliferative diseases include hyperproliferative diseases, such as pre-neoplastic hyperplastic conditions and neoplastic diseases. Neoplastic diseases are characterized by an abnormal proliferation of cells and include both benign and malignant neoplasias. Malignant neoplasia is also referred to as cancer.
The terms “protein,” “peptide,” and “polypeptide” are used interchangeably herein, and refer to a polymer of amino acid residues linked together by peptide (amide) bonds. The terms refer to a protein, peptide, or polypeptide of any size, structure, or function. Typically, a protein, peptide, or polypeptide will be at least three amino acids long. A protein, peptide, or polypeptide may refer to an individual protein or a collection of proteins. One or more of the amino acids in a protein, peptide, or polypeptide may be modified, for example, by the addition of a chemical entity such as a carbohydrate group, a hydroxyl group, a phosphate group, a farnesyl group, an isofarnesyl group, a fatty acid group, a linker for conjugation, functionalization, or other modification, etc. A protein, peptide, or polypeptide may also be a single molecule or may be a multi-molecular complex. A protein, peptide, or polypeptide may be just a fragment of a naturally occurring protein or peptide. A protein, peptide, or polypeptide may be naturally occurring, recombinant, or synthetic, or any combination thereof. The term “fusion protein” as used herein refers to a hybrid polypeptide which comprises protein domains from at least two different proteins. One protein may be located at the amino-terminal (N-terminal) portion of the fusion protein or at the carboxy-terminal (C-terminal) protein thus forming an “amino-terminal fusion protein” or a “carboxy-terminal fusion protein,” respectively. A protein may comprise different domains, for example, a nucleic acid binding domain (e.g., the gRNA binding domain of Cas9 that directs the binding of the protein to a target site) and a nucleic acid cleavage domain or a catalytic domain of a nucleic-acid editing protein. In some embodiments, a protein comprises a proteinaceous part, e.g., an amino acid sequence constituting a nucleic acid binding domain, and an organic compound, e.g., a compound that can act as a nucleic acid cleavage agent. In some embodiments, a protein is in a complex with, or is in association with, a nucleic acid, e.g., RNA. Any of the proteins provided herein may be produced by any method known in the art. For example, the proteins provided herein may be produced via recombinant protein expression and purification, which is especially suited for fusion proteins comprising a peptide linker. Methods for recombinant protein expression and purification are well known, and include those described by Green and Sambrook, Molecular Cloning: A Laboratory Manual (4th ed., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. (2012)), the entire contents of which are incorporated herein by reference.
The term “RNA-programmable nuclease,” and “RNA-guided nuclease” are used interchangeably herein and refer to a nuclease that forms a complex with (e.g., binds or associates with) one or more RNA that is not a target for cleavage. In some embodiments, an RNA-programmable nuclease, when in a complex with an RNA, may be referred to as a nuclease:RNA complex. Typically, the bound RNA(s) is referred to as a guide RNA (gRNA). gRNAs can exist as a complex of two or more RNAs, or as a single RNA molecule. gRNAs that exist as a single RNA molecule may be referred to as single-guide RNAs (sgRNAs), though “gRNA” is used interchangeably to refer to guide RNAs that exist as either single molecules or as a complex of two or more molecules. Typically, gRNAs that exist as single RNA species comprise two domains: (1) a domain that shares homology to a target nucleic acid (e.g., and directs binding of a Cas9 complex to the target); and (2) a domain that binds a Cas9 protein. In some embodiments, domain (2) corresponds to a sequence known as a tracrRNA, and comprises a stem-loop structure. For example, in some embodiments, domain (2) is identical or homologous to a tracrRNA as provided in Jinek et al., Science 337:816-821(2012), the entire contents of which is incorporated herein by reference. Other examples of gRNAs (e.g., those including domain 2) can be found in U.S. Provisional Patent Application, U.S. Ser. No. 61/874,682, filed Sep. 6, 2013, entitled “Switchable Cas9 Nucleases and Uses Thereof,” and U.S. Provisional Patent Application, U.S. Ser. No. 61/874,746, filed Sep. 6, 2013, entitled “Delivery System For Functional Nucleases,” the entire contents of each are hereby incorporated by reference in their entirety. In some embodiments, a gRNA comprises two or more of domains (1) and (2), and may be referred to as an “extended gRNA.” For example, an extended gRNA will, e.g., bind two or more Cas9 proteins and bind a target nucleic acid at two or more distinct regions, as described herein. The gRNA comprises a nucleotide sequence that complements a target site, which mediates binding of the nuclease/RNA complex to said target site, providing the sequence specificity of the nuclease:RNA complex. In some embodiments, the RNA-programmable nuclease is the (CRISPR-associated system) Cas9 endonuclease, for example Cas9 (Csn1) from Streptococcus pyogenes (see, e.g., “Complete genome sequence of an M1 strain of Streptococcus pyogenes.” Ferretti J. J., McShan W. M., Ajdic D. J., Savic D. J., Savic G., Lyon K., Primeaux C., Sezate S., Suvorov A. N., Kenton S., Lai H. S., Lin S. P., Qian Y., Jia H. G., Najar F. Z., Ren Q., Zhu H., Song L., White J., Yuan X., Clifton S. W., Roe B. A., McLaughlin R. E., Proc. Natl. Acad. Sci. U.S.A. 98:4658-4663 (2001); “CRISPR RNA maturation by trans-encoded small RNA and host factor RNase III.” Deltcheva E., Chylinski K., Sharma C. M., Gonzales K., Chao Y., Pirzada Z. A., Eckert M. R., Vogel J., Charpentier E., Nature 471:602-607 (2011); and “A programmable dual-RNA-guided DNA endonuclease in adaptive bacterial immunity.” Jinek M., Chylinski K., Fonfara I., Hauer M., Doudna J. A., Charpentier E. Science 337:816-821 (2012), the entire contents of each of which are incorporated herein by reference.
Because RNA-programmable nucleases (e.g., Cas9) use RNA:DNA hybridization to target DNA cleavage sites, these proteins are able to be targeted, in principle, to any sequence specified by the guide RNA. Methods of using RNA-programmable nucleases, such as Cas9, for site-specific cleavage (e.g., to modify a genome) are known in the art (see e.g., Cong, L. et al. Multiplex genome engineering using CRISPR/Cas systems. Science 339, 819-823 (2013); Mali, P. et al. RNA-guided human genome engineering via Cas9. Science 339, 823-826 (2013); Hwang, W. Y. et al. Efficient genome editing in zebrafish using a CRISPR-Cas system. Nature biotechnology 31, 227-229 (2013); Jinek, M. et al. RNA-programmed genome editing in human cells. eLife 2, e00471 (2013); Dicarlo, J. E. et al. Genome engineering in Saccharomyces cerevisiae using CRISPR-Cas systems. Nucleic acids research (2013); Jiang, W. et al. RNA-guided editing of bacterial genomes using CRISPR-Cas systems. Nature biotechnology 31, 233-239 (2013); the entire contents of each of which are incorporated herein by reference).
The term “subject,” as used herein, refers to an individual organism, for example, an individual mammal. In some embodiments, the subject is a human. In some embodiments, the subject is a non-human mammal. In some embodiments, the subject is a non-human primate. In some embodiments, the subject is a rodent. In some embodiments, the subject is a sheep, a goat, a cattle, a cat, or a dog. In some embodiments, the subject is a vertebrate, an amphibian, a reptile, a fish, an insect, a fly, or a nematode. In some embodiments, the subject is a research animal. In some embodiments, the subject is genetically engineered, e.g., a genetically engineered non-human subject. The subject may be of either sex, of any age, and at any stage of development.
The term “target site” refers to a sequence within a nucleic acid molecule that is deaminated by a deaminase or a fusion protein comprising a deaminase (e.g., a dCas9-deaminase fusion protein provided herein).
The terms “treatment,” “treat,” and “treating,” refer to a clinical intervention aimed to reverse, alleviate, delay the onset of, or inhibit the progress of a disease or disorder, or one or more symptoms thereof, as described herein. As used herein, the terms “treatment,” “treat,” and “treating” refer to a clinical intervention aimed to reverse, alleviate, delay the onset of, or inhibit the progress of a disease or disorder, or one or more symptoms thereof, as described herein. In some embodiments, treatment may be administered after one or more symptoms have developed and/or after a disease has been diagnosed. In other embodiments, treatment may be administered in the absence of symptoms, e.g., to prevent or delay onset of a symptom or inhibit onset or progression of a disease. For example, treatment may be administered to a susceptible individual prior to the onset of symptoms (e.g., in light of a history of symptoms and/or in light of genetic or other susceptibility factors). Treatment may also be continued after symptoms have resolved, for example, to prevent or delay their recurrence.
The term “recombinant” as used herein in the context of proteins or nucleic acids refers to proteins or nucleic acids that do not occur in nature, but are the product of human engineering. For example, in some embodiments, a recombinant protein or nucleic acid molecule comprises an amino acid or nucleotide sequence that comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations as compared to any naturally occurring sequence.
The term “nucleic acid editing enzyme” as used herein refers to proteins that are able to modify a nucleic acids or one or more nucleotide bases of a nucleic acid. For example, in some embodiments, a nucleic acid editing enzyme is a deaminase, which can catalyze C to T or G to A changes. Other suitable nucleic acid editing enzyme that may be used in accordance with this disclosure include, without limitation, a nuclease, nickase, recombinase, deaminase, methyltransferase, methylase, acetylase, or acetyltransferase.
Some aspects of this disclosure provide recombinant Cas9 proteins that efficiently target DNA sequences that do not comprise the canonical PAM sequence (5′-NGG-3′, where N is any nucleotide, for example A, T, G, or C) at their 3′-ends. In some embodiments, the Cas9 proteins provided herein comprise one or more mutations identified in directed evolution experiments using a target sequence library comprising randomized PAM sequences. The recombinant non-PAM restricted Cas9 proteins provided herein are useful for targeting DNA sequences that do not comprise the canonical PAM sequence at their 3′-end and thus greatly extend the usefulness of Cas9 technology for gene editing.
Some aspects of this disclosure provide fusion proteins that comprise a Cas9 protein and an effector domain, for example, a DNA-editing domain, such as, e.g., a deaminase domain. The deamination of a nucleobase by a deaminase can lead to a point mutation at the specific residue, which is referred to herein as nucleic acid editing. Fusion proteins comprising a Cas9 protein or variant thereof and a DNA-editing domain can thus be used for the targeted editing of nucleic acid sequences. Such fusion proteins are useful for targeted editing of DNA in vitro, e.g., for the generation of mutant cells or animals; for the introduction of targeted mutations, e.g., for the correction of genetic defects in cells ex vivo, e.g., in cells obtained from a subject that are subsequently re-introduced into the same or another subject; and for the introduction of targeted mutations, e.g., the correction of genetic defects or the introduction of deactivating mutations in disease-associated genes in a subject in vivo. Typically, the Cas9 protein of the fusion proteins described herein does not have any nuclease activity but instead is a Cas9 fragment or a dCas9 protein. Methods for the use of Cas9 fusion proteins as described herein are also provided.
Non-limiting, exemplary nuclease-inactive Cas9 proteins are provided herein. One exemplary suitable nuclease-inactive Cas9 protein is the D10A/H840A Cas9 protein mutant:
see, e.g., Qi et al., Repurposing CRISPR as an RNA-guided platform for sequence-specific control of gene expression. Cell. 2013; 152(5):1173-83, the entire contents of which are incorporated herein by reference).
Additional suitable nuclease-inactive Cas9 proteins will be apparent to those of skill in the art based on this disclosure. Such additional exemplary suitable nuclease-inactive Cas9 proteins include, but are not limited to, D10A, D839A, H840A, N863A, D10A/D839A, D10A/H840A, D10A/N863A, D839A/H840A, D839A/N863A, D10A/D839A/H840A, and D10A/D839A/H840A/N863A mutant proteins (See, e.g., Prashant et al., CAS9 transcriptional activators for target specificity screening and paired nickases for cooperative genome engineering. Nature Biotechnology. 2013; 31(9): 833-838, the entire contents of which are incorporated herein by reference).
Recombinant Cas9 Proteins
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of Cas9 as provided by any of the sequences provided in SEQ ID NOs: 10-262, wherein the Cas9 protein comprises a RuvC and an HNH domain, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations at an amino acid residue selected from the group consisting of amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of the amino acid sequence provided in SEQ ID NO: 9, or in a corresponding amino acid residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262, and wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein.
In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of X262T, X294R, X409I, X480K, X543D, X694I, and X1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid at the corresponding position.
In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of A262T, K294R, S409I, E480K, E543D, M694I, or E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 protein comprises an X1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 protein comprises an E1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the HNH domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the HNH domain of SEQ ID NO: 9. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of SEQ ID NO: 9. In some embodiments, the Cas9 protein comprises a D10A and/or a H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
Recombinant Cas9 Proteins with Activity on Non-Canonical PAMs
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9, comprising the RuvC and HNH domains of SEQ ID NO: 9, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of the amino acid sequence provided in SEQ ID NO: 9, wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein, and wherein the recombinant Cas9 protein exhibits activity (e.g., increased activity) on a target sequence that does not comprise the canonical PAM (5′-NGG-3′) at its 3′-end as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9.
In some embodiments, the Cas9 protein exhibits activity on a target sequence having a 3′-end that is not directly adjacent to the canonical PAM sequence (5′-NGG-3′) that is at least 2-fold, at least 3-fold, at least 5-fold, at least 10-fold, at least 50-fold, at least 100-fold, at least 500-fold, at least 1,000-fold, at least 5,000-fold, at least 10,000-fold, at least 50,000-fold, at least 100,000-fold, at least 500,000-fold, or at least 1,000,000-fold increased as compared to the activity of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9 on the same target sequence. In some embodiments, the 3′-end of the target sequence is directly adjacent to an AGC, GAG, TTT, GTG, or CAA sequence. In some embodiments, the Cas9 protein activity is measured by a nuclease assay, a deamination assay, or a transcriptional activation assay. In some embodiments, the transcriptional activation assay is a reporter activation assay, such as a GFP activation assay. Exemplary methods for measuring binding activity (e.g., of Cas9) using transcriptional activation assays are known in the art and would be apparent to the skilled artisan. For example, methods for measuring Cas9 activity using the tripartite activator VPR have been described in Chavez A., et al., “Highly efficient Cas9-mediated transcriptional programming.” Nature Methods 12, 326-328 (2015); the entire contents of which are incorporated by reference herein.
In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of X262T, X294R, X409I, X480K, X543D, X694I, and X1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid at the corresponding position.
In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of A262T, K294R, S409I, E480K, E543D, M694I, or E1219V of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 protein comprises an X1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 comprises an X1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the HNH domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the HNH domain of any of SEQ ID NOs: 2, 4, or 9. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises a D10A and/or a H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9, comprising the RuvC and HNH domains of SEQ ID NO: 9, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of the amino acid sequence provided in SEQ ID NO: 9, wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein, and wherein the recombinant Cas9 protein exhibits an increased activity on a target sequence that does not comprise the canonical PAM (5′-NGG-3′) at its 3′-end as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 2, 4, or 9. In some embodiments, the Cas9 protein comprises a D10A and a H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9, comprising the RuvC and HNH domains of SEQ ID NO: 9, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of the amino acid sequence provided in SEQ ID NO: 9, wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein, and wherein the recombinant Cas9 protein exhibits an increased activity on a target sequence that does not comprise the canonical PAM (5′-NGG-3′) at its 3′-end as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 2, 4, or 9. In some embodiments, the Cas9 protein comprises a D10A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 further comprises a histidine residue at position 840 as provided in SEQ ID NO: 9, or a corresponding histidine residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262. Without wishing to be bound by any particular theory, the presence of the catalytic residue H840 allows Cas9 to cleave the non-targeted strand, i.e., the strand bound by the sgRNA. In some embodiments, a Cas9 having an amino acid residue other than histidine at position 840 of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding amino acid sequence provided in SEQ ID NOs: 10-262 may be changed or reverted such that amino acid residue 840 of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding amino acid sequence provided in SEQ ID NOs: 10-262 is histidine.
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9, comprising the RuvC and HNH domains of SEQ ID NO: 9; wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 262, 267, 294, 405, 409, 480, 543, 694, 1219, 1224, and 1256 of the amino acid sequence provided in SEQ ID NO: 9; wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein; and wherein the recombinant Cas9 protein exhibits activity (e.g., increased activity) on a target sequence that does not comprise the canonical PAM (5′-NGG-3′) at its 3′-end as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9.
In some embodiments, the Cas9 protein exhibits an activity on a target sequence having a 3′-end that is not directly adjacent to the canonical PAM sequence (5′-NGG-3′) that is at least 2-fold, at least 3-fold, at least 5-fold, at least 10-fold, at least 50-fold, at least 100-fold, at least 500-fold, at least 1,000-fold, at least 5,000-fold, at least 10,000-fold, at least 50,000-fold, at least 100,000-fold, at least 500,000-fold, or at least 1,000,000-fold increased as compared to the activity of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9 on the same target sequence. In some embodiments, the 3′-end of the target sequence is directly adjacent to an AAA, AAC, AAG, AAT, CAA, CAC, CAG, CAT, GAA, GAC, GAG, GAT, TAA, TAC, TAG, TAT, ACA, ACC, ACG, ACT, CCA, CCC, CCG, CCT, GCA, GCC, GCG, GCT, TCA, TCC, TCG, TCT, AGA, AGC, AGT, CGA, CGC, CGT, GGA, GGC, GGT, TGA, TGC, TGT, ATA, ATC, ATG, ATT, CTA, CTC, CTG, CTT, GTA, GTC, GTG, GTT, TTA, TTC, TTG, or TTT PAM sequence.
In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of X262T, X267G, X294R, X405I, X409I, X480K, X543D, X694I, X1219V, X1224K, X1256K, and X1362P of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X represents any amino acid at the corresponding position.
In some embodiments, the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations selected from the group consisting of A262T, S267G, K294R, F405I, S409I, E480K, E543D, M694I, E1219V, N1224K, Q1256K, and L1362P of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 protein comprises an X1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 protein comprises an E1219V mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an X480K mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 protein comprises an E480K mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises an X543D mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 protein comprises an E543D mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the Cas9 protein comprises the combination of mutations selected from the group consisting of (X480K, X543D, and X1219V); (X262T, X409I, X480K, X543D, X694I, and X1219V); (X294R, X480K, X543D, X1219V, X1256K, and X1362P); (X294R, X480K, X543D, X1219V, and X1256K); (X267G, X294R, X480K, X543D, X1219V, X1224K, and X1256K); and (X262T, X405I, X409I, X480K, X543D, X694I, and X1219V) of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the amino acid sequence of the Cas9 protein comprises the combination of mutations selected from the group consisting of (E480K, E543D, and E1219V); (A262T, S409I, E480K, E543D, M694I, and E1219V); (K294R, E480K, E543D, E1219V, Q1256K, and L1362P); (K294R, E480K, E543D, E1219V, and Q1256K); (S267G, K294R, E480K, E543DE1219V, N1224K, and Q1256K); and (A262T, F405I, S409I, E480K, E543D, M694I, and E1219V) of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
In some embodiments, the amino acid sequence of the HNH domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the HNH domain of any of SEQ ID NOs: 2, 4, or 9. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 2, 4, or 9. In some embodiments, the Cas9 protein comprises a D10A and/or a H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises a D10A and an H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises a D10A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises an H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9, comprising the RuvC and HNH domains of SEQ ID NO: 9, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 262, 267, 294, 405, 409, 480, 543, 694, 1219, 1224, 1256, and 1362 of the amino acid sequence provided in SEQ ID NO: 9, wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein, and wherein the recombinant Cas9 protein exhibits increased activity on a target sequence that does not include the canonical PAM (5′-NGG-3′) at its 3′-end as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 2, 4, or 9. In some embodiments, the Cas9 protein comprises a D10A and a H840A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262.
Some aspects of this disclosure provide recombinant Cas9 proteins comprising an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9, comprising the RuvC and HNH domains of SEQ ID NO: 9, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations at an amino acid residue selected from the group consisting of amino acid residues 262, 267, 294, 405, 409, 480, 543, 694, 1219, 1224, 1256, and 1362 of the amino acid sequence provided in SEQ ID NO: 9, wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein, and wherein the recombinant Cas9 protein exhibits increased activity on a target sequence that does not comprise the canonical PAM (5′-NGG-3′) at its 3′-end as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9. In some embodiments, the amino acid sequence of the RuvC domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of the RuvC domain of any of SEQ ID NOs: 2, 4, or 9. In some embodiments, the Cas9 protein comprises a D10A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 further comprises a histidine residue at position 840 as provided in SEQ ID NO: 9, or a corresponding histidine residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262. Without wishing to be bound by any particular theory, the presence of the catalytic residue H840 allows Cas9 to cleave the non-targeted strand, i.e., the strand bound by the sgRNA. In some embodiments, a Cas9 having an amino acid residue other than histidine at position 840 of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding amino acid sequence provided in SEQ ID NOs: 10-262 may be changed or reverted such that amino acid residue 840 of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding amino acid sequence provided in SEQ ID NOs: 10-262 is histidine.
Cas9 Fusion Proteins
Some aspects of this disclosure provide fusion proteins comprising a Cas9 protein as provided herein that is fused to a second protein, or a “fusion partner”, such as an effector domain, thus forming a fusion protein. In some embodiments, the effector domain is fused to the N-terminus of the Cas9 protein. In some embodiments, the effector domain is fused to the C-terminus of the Cas9 protein. In some embodiments, the Cas9 protein and the effector domain are fused to each other via a linker. Suitable strategies for generating fusion proteins according to aspects of this disclosure using linkers or without the use of linkers will also be apparent to those of skill in the art in view of the instant disclosure and the knowledge in the art. For example, Gilbert et al., CRISPR-mediated modular RNA-guided regulation of transcription in eukaryotes. Cell. 2013; 154(2):442-51, showed that C-terminal fusions of Cas9 with VP64 using 2 NLS's as a linker (SPKKKRKVEAS, SEQ ID NO: 284), can be employed for transcriptional activation. Mali et al., CAS9 transcriptional activators for target specificity screening and paired nickases for cooperative genome engineering. Nat Biotechnol. 2013; 31(9):833-8, reported that C-terminal fusions with VP64 without linker can be employed for transcriptional activation. And Maeder et al., CRISPR RNA-guided activation of endogenous human genes. Nat Methods. 2013; 10: 977-979, reported that C-terminal fusions with VP64 using a Gly4Ser (SEQ ID NO: 5) linker can be used as transcriptional activators. Recently, dCas9-FokI nuclease fusions have successfully been generated and exhibit improved enzymatic specificity as compared to the parental Cas9 enzyme (In Guilinger J P, Thompson D B, Liu D R. Fusion of catalytically inactive Cas9 to FokI nuclease improves the specificity of genome modification. Nat. Biotechnol. 2014; 32(6): 577-82, and in Tsai S Q, Wyvekens N, Khayter C, Foden J A, Thapar V, Reyon D, Goodwin M J, Aryee M J, Joung J K. Dimeric CRISPR RNA-guided FokI nucleases for highly specific genome editing. Nat Biotechnol. 2014; 32(6):569-76. PMID: 24770325 a SGSETPGTSESATPES (SEQ ID NO: 7) or a GGGGS. (SEQ ID NO: 5) linker was used in FokI-dCas9 fusion proteins, respectively). In some embodiments, the linker comprises a (GGGGS)n (SEQ ID NO: 5), a (G)n (SEQ ID NO: 5087), an (EAAAK)n (SEQ ID NO: 6), a (GGS)n(SEQ ID NO: 5088), an SGSETPGTSESATPES (SEQ ID NO: 7), or an (XP)n (SEQ ID NO: 5089) motif, or a combination of any of these, wherein n is independently an integer between 1 and 30. In some embodiments, the effector domain comprises an enzymatic domain. Suitable effector domains include, without limitation a nuclease, nickase, recombinase, deaminase, methyltransferase, methylase, acetylase, acetyltransferase, transcriptional activator, and transcriptional repressor.
The linker may be as simple as a covalent bond, or it may be a polymeric linker many atoms in length. In certain embodiments, the linker is a polypeptide or based on amino acids. In other embodiments, the linker is not peptide-like. In certain embodiments, the linker is a covalent bond (e.g., a carbon-carbon bond, disulfide bond, carbon-heteroatom bond, etc.). In certain embodiments, the linker is a carbon-nitrogen bond of an amide linkage. In certain embodiments, the linker is a cyclic or acyclic, substituted or unsubstituted, branched or unbranched aliphatic or heteroaliphatic linker. In certain embodiments, the linker is polymeric (e.g., polyethylene, polyethylene glycol, polyamide, polyester, etc.). In certain embodiments, the linker comprises a monomer, dimer, or polymer of aminoalkanoic acid. In certain embodiments, the linker comprises an aminoalkanoic acid (e.g., glycine, ethanoic acid, alanine, beta-alanine, 3-aminopropanoic acid, 4-aminobutanoic acid, 5-pentanoic acid, etc.). In certain embodiments, the linker comprises a monomer, dimer, or polymer of aminohexanoic acid (Ahx). In certain embodiments, the linker is based on a carbocyclic moiety (e.g., cyclopentane, cyclohexane). In other embodiments, the linker comprises a polyethylene glycol moiety (PEG). In other embodiments, the linker comprises amino acids. In certain embodiments, the linker comprises a peptide. In certain embodiments, the linker comprises an aryl or heteroaryl moiety. In certain embodiments, the linker is based on a phenyl ring. The linker may included functionalized moieties to facilitate attachment of a nucleophile (e.g., thiol, amino) from the peptide to the linker. Any electrophile may be used as part of the linker. Exemplary electrophiles include, but are not limited to, activated esters, activated amides, Michael acceptors, alkyl halides, aryl halides, acyl halides, and isothiocyanates.
In some embodiments, the effector domain comprises a effector enzyme. Suitable effector enzymes that may be used in accordance with this disclosure include nucleases, nickases, recombinases, and deaminases. However additional effector enzymes would be apparent to the skilled artisan and are within the scope of this disclosure. In other embodiments, the effector domain comprises a domain that modulates transcriptional activity. Such transcriptional modulating domains may be, without limitation, a transcriptional activator or transcriptional repressor domain.
In some embodiments, the effector domain is a effector domain. In some embodiments, the effector domain is a deaminase domain. In some embodiments, the deaminase is a cytosine deaminase or a cytidine deaminase. In some embodiments, the deaminase is an apolipoprotein B mRNA-editing complex (APOBEC) family deaminase. In some embodiments, the deaminase is an APOBEC1 deaminase. In some embodiments, the deaminase is an APOBEC2 deaminase. In some embodiments, the deaminase is an APOBEC3 deaminase. In some embodiments, the deaminase is an APOBEC3A deaminase. In some embodiments, the deaminase is an APOBEC3D deaminase. In some embodiments, the deaminase is an APOBEC3E deaminase. In some embodiments, the deaminase is an APOBEC3F deaminase. In some embodiments, the deaminase is an APOBEC3G deaminase. In some embodiments, the deaminase is an APOBEC3H deaminase. In some embodiments, the deaminase is an APOBEC4 deaminase. In some embodiments, the deaminase is an activation-induced deaminase (AID).
In some embodiments, the effector domain is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the deaminase domain of any one of SEQ ID NOs: 263-281.
In some embodiments, the effector domain is a nuclease domain. In some embodiments, the nuclease domain is a FokI DNA cleavage domain. In some embodiments, this disclosure provides dimers of the fusion proteins provided herein, e.g., dimers of fusion proteins may include a trimerizing nuclease domain.
In some embodiments, the Cas9 protein comprises an amino acid sequence that is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of Cas9 as provided by any of the sequences provided in SEQ ID NOs: 10-262, wherein the Cas9 protein comprises a RuvC and an HNH domain, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of the amino acid sequence provided in SEQ ID NO: 9, or in a corresponding amino acid residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262, and wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein. In some embodiments, the Cas9 protein comprises an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9, comprising the RuvC and HNH domains of SEQ ID NO: 9, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of the amino acid sequence provided in SEQ ID NO: 9, wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein, and wherein the recombinant Cas9 protein exhibits activity on a target sequence that does not comprise the canonical PAM (5′-NGG-3′) at its 3′-end as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9.
In some embodiments, the Cas9 protein comprises an amino acid sequence that is at least 80%, at least 85%, at least 90%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to the amino acid sequence of Cas9 as provided by any of the sequences provided in SEQ ID NOs: 10-262, wherein the Cas9 protein comprises a RuvC and an HNH domain, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 262, 267, 294, 405, 409, 480, 543, 694, 1219, 1224, 1256, and 1362 of the amino acid sequence provided in SEQ ID NO: 9, or in a corresponding amino acid residue in any of the amino acid sequences provided in SEQ ID NOs: 10-262, and wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein. In some embodiments, the Cas9 protein comprises an amino acid sequence that is at least 90% identical to the amino acid sequence of Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9, comprising the RuvC and HNH domains of SEQ ID NO: 9, wherein the amino acid sequence of the Cas9 protein comprises at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations in an amino acid residue selected from the group consisting of amino acid residues 262, 267, 294, 405, 409, 480, 543, 694, 1219, 1224, and 1256 of the amino acid sequence provided in SEQ ID NO: 9; wherein the amino acid sequence of the recombinant Cas9 protein is not identical to the amino acid sequence of a naturally occurring Cas9 protein; and wherein the recombinant Cas9 protein exhibits increased activity on a target sequence that does not include the canonical PAM (5′-NGG-3′) at its 3′-end, as compared to Streptococcus pyogenes Cas9 as provided by SEQ ID NO: 9.
Some aspects of this disclosure provide fusion proteins comprising (i) a nuclease-inactive Cas9 protein; and (ii) a effector domain. In some embodiments, the effector domain is a DNA-editing domain. In some embodiments, the effector domain possesses deaminase activity. In some embodiments, the effector domain comprises or is a deaminase domain. In some embodiments, the deaminase is a cytidine deaminase. In some embodiments, the deaminase is an apolipoprotein B mRNA-editing complex (APOBEC) family deaminase. In some embodiments, the deaminase is an APOBEC1 family deaminase. In some embodiments, the deaminase is an activation-induced cytidine deaminase (AID). Some nucleic-acid editing domains as well as Cas9 fusion proteins including such domains are described in detail herein. Additional suitable effector domains will be apparent to the skilled artisan based on this disclosure. In some embodiments, the nucleic-acid editing domain is a FokI nuclease domain.
The instant disclosure provides Cas9:effector domain fusion proteins of various configurations. In some embodiments, the effector domain is fused to the N-terminus of the Cas9 protein. In some embodiments, the effector domain is fused to the C-terminus of the Cas9 protein. In some embodiments, the Cas9 protein and the effector domain are fused via a linker. In some embodiments, the linker comprises (GGGGS)n (SEQ ID NO: 5), (G)n (SEQ ID NO: 5087), (EAAAK)n (SEQ ID NO: 6), (GGS)n(SEQ ID NO: 5088), or SGSETPGTSESATPES (SEQ ID NO: 7) motif (see, e.g., Guilinger J P, Thompson D B, Liu D R. Fusion of catalytically inactive Cas9 to FokI nuclease improves the specificity of genome modification. Nat. Biotechnol. 2014; 32(6): 577-82; the entire contents are incorporated herein by reference), or an (XP)n (SEQ ID NO: 5089) motif, or a combination of any of these, wherein n is independently an integer between 1 and 30. In some embodiments, n is independently 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30, or, if more than one linker or more than one linker motif is present, any combination thereof. Additional suitable linker motifs and linker configurations will be apparent to those of skill in the art. In some embodiments, suitable linker motifs and configurations include those described in Chen et al., Fusion protein linkers: property, design and functionality. Adv Drug Deliv Rev. 2013; 65(10):1357-69, the entire contents of which are incorporated herein by reference. Additional suitable linker sequences will be apparent to those of skill in the art based on the instant disclosure and knowledge in the art.
In some embodiments, the general architecture of exemplary Cas9 fusion proteins provided herein comprises the structure:
In some embodiments, any of the fusion proteins provided herein may comprise one or more nuclear localization sequence (NLS). As used herein, a nuclear localization sequence refers to an amino acid sequence that promotes importation of a protein, for example any of the fusion proteins provided herein having an NLS, into the cell nucleus (e.g., via nuclear transport). Typically, an NLS comprises one or more short amino acid sequences of positively charged lysines or arginines exposed on the protein surface. Nuclear localization sequences are known in the art and would be apparent to the skilled artisan. For example nuclear localization sequences have been described in Kalderon D., et al., “A short amino acid sequence able to specify nuclear location”. Cell (1984) 39 (3 Pt 2): 499-509; Dingwall C., et al., “The nucleoplasmin nuclear location sequence is larger and more complex than that of SV-40 large T antigen”. J Cell Biol. (1988) 107 (3): 841-9; Makkerh J. P., et al., “Comparative mutagenesis of nuclear localization signals reveals the importance of neutral and acidic amino acids”. Curr Biol. (1996) 6 (8): 1025-7; and Ray M., et al., “Quantitative tracking of protein trafficking to the nucleus using cytosolic protein delivery by nanoparticle-stabilized nanocapsules”. Bioconjug. Chem. (2015) 26 (6): 1004-7; the entire contents of each are incorporated by reference herein. Additional nuclear localization sequences are described, for example, in Plank et al., PCT/EP2000/011690, the entire contents are incorporated by reference herein. In some embodiments, a NLS comprises the amino acid sequence PKKKRKV (SEQ ID NO: 299) or MDSLLMNRRKFLYQFKNVRWAKGRRETYLC (SEQ ID NO: 300).
Exemplary features that may be present are localization sequences, such as nuclear localization sequences, cytoplasmic localization sequences, export sequences, such as nuclear export sequences, or other localization sequences, as well as sequence tags that are useful for solubilization, purification, or detection of the fusion proteins. Suitable localization signal sequences and sequences of protein tags are provided herein, and include, but are not limited to, biotin carboxylase carrier protein (BCCP) tags, myc-tags, calmodulin-tags, FLAG-tags, hemagglutinin (HA)-tags, polyhistidine tags, also referred to as histidine tags or His-tags, maltose binding protein (MBP)-tags, nus-tags, glutathione-S-transferase (GST)-tags, green fluorescent protein (GFP)-tags, thioredoxin-tags, S-tags, Softags (e.g., Softag 1, Softag 3), strep-tags, biotin ligase tags, FlAsH tags, V5 tags, and SBP-tags. Additional suitable sequences will be apparent to those of skill in the art and are within the scope of this disclosure.
Any of the nuclear localization sequences provided herein may be fused to the fusion protein in any suitable localization. For example, to promote translocation of the fusion protein into a cell nucleus without compromising function of the fusion protein. In some embodiments, the NLS is fused N-terminal to the Cas9 protein of the fusion protein. In some embodiments, the NLS is fused C-terminal to the Cas9 protein of the fusion protein. In some embodiments, the NLS is fused N-terminal to the effector domain of the fusion protein. In some embodiments, the NLS is fused C-terminal to the effector domain of the fusion protein.
In some embodiments, the effector domain is a deaminase. For example, in some embodiments, the general architecture of exemplary Cas9 fusion proteins with a deaminase domain comprises the structure:
One exemplary suitable type of effector domain includes cytosine deaminases, for example, of the APOBEC family. The apolipoprotein B mRNA-editing complex (APOBEC) family of cytosine deaminase enzymes encompasses eleven proteins that serve to initiate mutagenesis in a controlled and beneficial manner.29 One family member, activation-induced cytidine deaminase (AID), is responsible for the maturation of antibodies by converting cytosines in ssDNA to uracils in a transcription-dependent, strand-biased fashion.30 The apolipoprotein B editing complex 3 (APOBEC3) enzyme provides protection to human cells against a certain HIV-1 strain via the deamination of cytosines in reverse-transcribed viral ssDNA.31 These proteins all require a Zn2+-coordinating motif (His-X-Glu-X23-26-Pro-Cys-X2-4-Cys; SEQ ID NO: 283) and bound water molecule for catalytic activity. The Glu residue acts to activate the water molecule to a zinc hydroxide for nucleophilic attack in the deamination reaction. Each family member preferentially deaminates at its own particular “hotspot,” ranging from WRC (W is A or T, R is A or G) for hAID, to TTC for hAPOBEC3F.32 A recent crystal structure of the catalytic domain of APOBEC3G revealed a secondary structure comprised of a five-stranded β-sheet core flanked by six α-helices, which is believed to be conserved across the entire family.33 The active center loops have been shown to be responsible for both ssDNA binding and in determining “hotspot” identity.34 Overexpression of these enzymes has been linked to genomic instability and cancer, thus highlighting the importance of sequence-specific targeting.
Some aspects of this disclosure provide a systematic series of fusions between Cas9 and deaminase domains, e.g., cytosine deaminase enzymes such as APOBEC enzymes, or adenosine deaminase enzymes such as ADAT enzymes, that has been generated in order to direct the enzymatic activities of these deaminases to a specific site in genomic DNA. The advantages of using Cas9 as the recognition agent are two-fold: (1) the sequence specificity of Cas9 can be easily altered by simply changing the sgRNA sequence; and (2) Cas9 binds to its target sequence by denaturing the dsDNA, resulting in a stretch of DNA that is single-stranded and therefore a viable substrate for the deaminase. It will be understood that other catalytic domains, or catalytic domains from other deaminases, can also be used to generate fusion proteins with Cas9, and that the disclosure is not limited in this regard.
Some aspects of this disclosure are based on the recognition that cas9:deaminase fusion proteins can efficiently deaminate nucleotides at positions 3-11 according to the numbering scheme in
Some exemplary suitable nucleic-acid editing domains, e.g., deaminases and deaminase domains, that can be fused to Cas9 domains according to aspects of this disclosure are provided below. Typically, deaminase require a Zn2+-coordinating motif (His-X-Glu-X23-26-Pro-Cys-X2-4-Cys; SEQ ID NO: 283) and bound water molecule for catalytic activity. The Glu residue acts to activate the water molecule to a zinc hydroxide for nucleophilic attack in the deamination reaction. It will be understood that, in some embodiments, the active domain of the respective sequence can be used, e.g., the domain without a localizing signal (nuclear localizing signal, without nuclear export signal, cytoplasmic localizing signal).
MDSLLMNRRKFLYQFKNVRWAKGRRETYLCYVVKRRDSATSFSLDFGYL
GL
MDSLLMKQKKFLYHFKNVRWAKGRHETYLCYVVKRRDSATSCSLDFGHL
GF
MDSLLMKQRKFLYHFKNVRWAKGRHETYLCYVVKRRDSATSFSLDFGHL
GL
MDSLLKKQRQFLYQFKNVRWAKGRHETYLCYVVKRRDSPTSFSLDFGHL
LGL
YMSWSPCFECAEQIVRFLATHHNLSLDIFSSRLYNVQDPETQQNLCRLV
DKIRSMELSQVTITCYLTWSPCPNCAWQLAAFKRDRPDLILHIYTSRLY
YMSWSPCFECAEQVLRFLATHHNLSLDIFSSRLYNIRDPENQQNLCRLV
DKIRSMELSQVIITCYLTWSPCPNCAWQLAAFKRDRPDLILHIYTSRLY
MVEPMDPRTFVSNFNNRPILSGLNTVWLCCEVKTKDPSGPPLDAKIFQG
KVYSKAKYHPEM
RFLRWFHKWRQLHHDQEYKVTWYVSWSPCTRCANSVA
MKPHFRNPVERMYQDTFSDNFYNRPILSHRNTVWLCYEVKTKGPSRPPL
DAKIFRGQVYSKLKYHPEAIRFFHWFSKWRKLHRDQEYEVTWYISWSPC
TKCTRDVATFLAEDPKVTLTIFVARLYYFWDPDYQEALRSLCQKRDGPR
MNPQIRNMVEQMEPDIFVYYFNNRPILSGRNTVWLCYEVKTKDPSGPPL
DANIFQGKLYPEAKDHPEMKFLHWFRKWRQLHRDQEYEVTWYVSWSPCT
RCANSVATFLAEDPKVTLTIFVARLYYFWKPDYQQALRILCQERGGPHA
MKPHFRNTVERMYRDTFSYNFYNRPILSRRNTVWLCYEVKTKGPSRPPL
DAKIFRGQVYSELKYHPEMRFFHWFSKWRKLHRDQEYEVTWYISWSPCT
KCTRDMATFLAEDPKVTLTIFVARLYYFWDPDYQEALRSLCQKRDGPRA
CVAKLAEFLAEHPNVTLTISAARLYYYWERDYRRALCRLSQAGARVKIM
DCVAKLAEFLSEHPNVTLTISAARLYYYWERDYRRALCRLSQAGARVTI
DCAGEVAEFLARHSNVNLTIFTARLYYFQYPCYQEGLRSLSQEGVAVEI
WSPCFSWGCAGEVRAFLENTHVRLRIFAARIYDYDPLYKEALQMLRDAG
QITWFVSWNPCLPCVVKVTKFLAEHPNVTLTISAARLYYYRDRDWRWVL
ECAGEVAEFLARHSNVNLTIFTARLCYFWDTDYQEGLCSLSQEGASVKI
In some embodiments, fusion proteins as provided herein comprise the full-length amino acid of a effector domain, e.g., one of the sequences provided above. In other embodiments, however, fusion proteins as provided herein do not comprise a full-length sequence of a effector domain, but only a fragment thereof. For example, in some embodiments, a fusion protein provided herein comprises a Cas9 protein and a fragment of a effector domain, e.g., wherein the fragment comprises a effector domain. Exemplary amino acid sequences of effector domains are shown in the sequences above as italicized letters, and additional suitable sequences of such domains will be apparent to those of skill in the art.
Additional suitable nucleic-acid editing domain, e.g., deaminase domain sequences, that can be used according to aspects of this disclosure, e.g., that can be fused to a nuclease-inactive Cas9 protein, will be apparent to those of skill in the art based on this disclosure. In some embodiments, such additional domain sequences include deaminase domain sequences that are at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99% similar to the sequences provided herein. Additional suitable Cas9 proteins, variants, and sequences will also be apparent to those of skill in the art. Examples of such additional suitable Cas9 proteins include, but are not limited to Cas9 proteins with the following mutations: D10A, D10A/D839A/H840A, and D10A/D839A/H840A/N863A (See, e.g., Prashant et al., CAS9 transcriptional activators for target specificity screening and paired nickases for cooperative genome engineering. Nature Biotechnology. 2013; 31(9): 833-838 the entire contents of which are incorporated herein by reference).
Additional suitable strategies for generating fusion proteins comprising a Cas9 protein and an effector domain, such as a DNA-editing domain, will be apparent to those of skill in the art based on this disclosure in combination with the general knowledge in the art. Suitable strategies for generating fusion proteins according to aspects of this disclosure using linkers or without the use of linkers will also be apparent to those of skill in the art in view of the instant disclosure and the knowledge in the art. For example, Gilbert et al., CRISPR-mediated modular RNA-guided regulation of transcription in eukaryotes. Cell. 2013; 154(2):442-51, showed that C-terminal fusions of Cas9 with VP64 using 2 NLS's as a linker (SPKKKRKVEAS, SEQ ID NO: 284), can be employed for transcriptional activation. Mali et al., Cas9 transcriptional activators for target specificity screening and paired nickases for cooperative genome engineering. Nat Biotechnol. 2013; 31(9):833-8, reported that C-terminal fusions with VP64 without linker can be employed for transcriptional activation. And Maeder et al., CRISPR RNA-guided activation of endogenous human genes. Nat Methods. 2013; 10: 977-979, reported that C-terminal fusions with VP64 using a Gly4Ser (SEQ ID NO: 5) linker can be used as transcriptional activators. Recently, dCas9-FokI nuclease fusions have successfully been generated and exhibit improved enzymatic specificity as compared to the parental Cas9 enzyme (In Guilinger J P, Thompson D B, Liu D R. Fusion of catalytically inactive Cas9 to FokI nuclease improves the specificity of genome modification. Nat. Biotechnol. 2014; 32(6):577-82, and in Tsai S Q, Wyvekens N, Khayter C, Foden J A, Thapar V, Reyon D, Goodwin M J, Aryee M J, Joung J K. Dimeric CRISPR RNA-guided FokI nucleases for highly specific genome editing. Nat. Biotechnol. 2014; 32(6):569-76. PMID: 24770325 a SGSETPGTSESATPES (SEQ ID NO: 7) or a GGGGS (SEQ ID NO: 5) linker was used in FokI-dCas9 fusion proteins, respectively).
In some embodiments, the Cas9 fusion protein comprises: (i) Cas9 protein; and (ii) a transcriptional activator domain. In some embodiments, the transcriptional activator domain comprises a VPR. VPR is a VP64-SV40-P65-RTA tripartite activator. In some embodiments, VPR comprises a VP64 amino acid sequence encoded by the nucleic acid sequence of SEQ ID NO: 292:
In some embodiments, VPR comprises a VP64 amino acid sequence as set forth in SEQ ID NO: 293:
In some embodiments, VPR comprises a VP64-SV40-P65-RTA amino acid sequence encoded by the nucleic acid sequence of SEQ ID NO: 294:
In some embodiments, VPR comprises a VP64-SV40-P65-RTA amino acid sequence as set forth in SEQ ID NO: 295:
Some aspects of this disclosure provide fusion proteins comprising a transcription activator. In some embodiments, the transcriptional activator is VPR. In some embodiments, the VPR comprises a wild type VPR or a VPR as set forth in SEQ ID NO: 293. In some embodiments, the VPR proteins provided herein include fragments of VPR and proteins homologous to a VPR or a VPR fragment. For example, in some embodiments, a VPR comprises a fragment of the amino acid sequence set forth in SEQ ID NO: 293. In some embodiments, a VPR comprises an amino acid sequence homologous to the amino acid sequence set forth in SEQ ID NO: 293 or an amino acid sequence homologous to a fragment of the amino acid sequence set forth in SEQ ID NO: 293. In some embodiments, proteins comprising VPR or fragments of VPR or homologs of VPR or VPR fragments are referred to as “VPR variants.” A VPR variant shares homology to VPR, or a fragment thereof. For example a VPR variant is at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 96% identical, at least about 97% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% to a wild type VPR or a VPR as set forth in SEQ ID NO: 293. In some embodiments, the VPR variant comprises a fragment of VPR, such that the fragment is at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 96% identical, at least about 97% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% to the corresponding fragment of wild type VPR or a VPR as set forth in SEQ ID NO: 293. In some embodiments, the VPR comprises the amino acid sequence set forth in SEQ ID NO: 293. In some embodiments, the VPR comprises an amino acid sequence encoded by the nucleotide sequence set forth in SEQ ID NO: 292.
In some embodiments, a VPR is a VP64-SV40-P65-RTA triple activator. In some embodiments, the VP64-SV40-P65-RTA comprises a VP64-SV40-P65-RTA as set forth in SEQ ID NO: 295. In some embodiments, the VP64-SV40-P65-RTA proteins provided herein include fragments of VP64-SV40-P65-RTA and proteins homologous to a VP64-SV40-P65-RTA or a VP64-SV40-P65-RTA fragment. For example, in some embodiments, a VP64-SV40-P65-RTA comprises a fragment of the amino acid sequence set forth in SEQ ID NO: 295. In some embodiments, a VP64-SV40-P65-RTA comprises an amino acid sequence homologous to the amino acid sequence set forth in SEQ ID NO: 295 or an amino acid sequence homologous to a fragment of the amino acid sequence set forth in SEQ ID NO: 295. In some embodiments, proteins comprising VP64-SV40-P65-RTA or fragments of VP64-SV40-P65-RTA or homologs of VP64-SV40-P65-RTA or VP64-SV40-P65-RTA fragments are referred to as “VP64-SV40-P65-RTA variants.” A VP64-SV40-P65-RTA variant shares homology to VP64-SV40-P65-RTA, or a fragment thereof. For example a VP64-SV40-P65-RTA variant is at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 96% identical, at least about 97% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% to a VP64-SV40-P65-RTA as set forth in SEQ ID NO: 295. In some embodiments, the VP64-SV40-P65-RTA variant comprises a fragment of VP64-SV40-P65-RTA, such that the fragment is at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 96% identical, at least about 97% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% to the corresponding fragment of a VP64-SV40-P65-RTA as set forth in SEQ ID NO: 295. In some embodiments, the VP64-SV40-P65-RTA comprises the amino acid sequence set forth in SEQ ID NO: 295. In some embodiments, the VP64-SV40-P65-RTA comprises an amino acid sequence encoded by the nucleotide sequence set forth in SEQ ID NO: 294.
Some aspects of this disclosure provide fusion proteins comprising (i) a Cas9 protein; and (ii) a effector domain. In some aspects, the fusion proteins provided herein further include (iii) a DNA-binding protein, for example, a zinc-finger domain, a TALE, or a second Cas9 protein. Without wishing to be bound by any particular theory, fusing a DNA-binding protein (e.g., a second Cas9 protein) to a fusion protein comprising (i) a protein; and (ii) a effector domain may be useful for improving specificity of the fusion protein to a target nucleic acid sequence, or for improving specificity or binding affinity of the fusion protein to bind a target nucleic acid sequence that does not contain the canonical PAM (5′-NGG-3′) sequence. In some embodiments, the second Cas9 protein is any of the Cas9 proteins provided herein. In some embodiments, the second Cas9 protein is fused to the fusion protein N-terminal to the Cas9 protein. In some embodiments, the second Cas9 protein is fused to the fusion protein C-terminal to the Cas9 protein. In some embodiments, the Cas9 protein and the second Cas9 protein are fused via a linker.
Further provided herein are complexes comprising any of the fusion proteins provided herein, a first guide RNA bound to the Cas9 protein of the fusion protein, and a second guide RNA bound to the second Cas9 protein of the fusion protein. In some embodiments, the first guide RNA is about 15-100 nucleotides long and comprises a sequence of at least 10 contiguous nucleotides that is complementary to a first target sequence and the second guide RNA is about 15-100 nucleotides long and comprises a sequence of at least 10 contiguous nucleotides that is complementary to a second target sequence. In some embodiments, the first guide RNA and/or the second guide RNA is 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 nucleotides long. In some embodiments, the first guide RNA and the second guide RNA are different. In some embodiments, the first guide RNA comprises a sequence of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 contiguous nucleotides that is complementary to a first target sequence, and wherein the second guide RNA comprises a sequence of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 contiguous nucleotides that is complementary to a second target sequence. In some embodiments, the first target sequence and the second target sequence are different. In some embodiments, the first target sequence and the second target sequence are DNA sequences. In some embodiments, the first target sequence and the second target sequence are in the genome of a mammal. In some embodiments, the first target sequence and the second target sequence are in the genome of a human. In some embodiments, the first target sequence is within 30 nucleotides of the second target sequence. In some embodiments, the 3′ end of the first target sequence is not immediately adjacent to the canonical PAM sequence (5′-NGG-3′). In some embodiments, the 3′ end of the second target sequence is not immediately adjacent to the canonical PAM sequence (5′-NGG-3′).
In some embodiments, the general architecture of exemplary Cas9 fusion proteins provided herein is of the structure:
Some aspects of this disclosure provide fusion proteins comprising a Cas9 protein fused to a effector domain, e.g., a deaminase, and a uracil glycosylase inhibitor (UGI). In some embodiments, the fusion protein comprises the structure:
In some embodiments, the fusion protein further comprises a second Cas9 protein. For example, the second Cas9 protein may be any of the Cas9 proteins provided herein. In some embodiments, fusion protein comprises the structure:
In some embodiments, the UGI comprises a wild type UGI or a UGI as set forth in SEQ ID NO: 553. In some embodiments, the UGI proteins provided herein include fragments of UGI and proteins homologous to a UGI or a UGI fragment. For example, in some embodiments, a UGI comprises a fragment of the amino acid sequence set forth in SEQ ID NO: 553. In some embodiments, a UGI comprises an amino acid sequence homologous to the amino acid sequence set forth in SEQ ID NO: 553 or an amino acid sequence homologous to a fragment of the amino acid sequence set forth in SEQ ID NO: 553. In some embodiments, proteins comprising UGI or fragments of UGI or homologs of UGI or UGI fragments are referred to as “UGI variants.” A UGI variant shares homology to UGI, or a fragment thereof. For example a UGI variant is at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 96% identical, at least about 97% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% to a wild type UGI or a UGI as set forth in SEQ ID NO: 553. In some embodiments, the UGI variant comprises a fragment of UGI, such that the fragment is at least about 70% identical, at least about 80% identical, at least about 90% identical, at least about 95% identical, at least about 96% identical, at least about 97% identical, at least about 98% identical, at least about 99% identical, at least about 99.5% identical, or at least about 99.9% to the corresponding fragment of wild type UGI or a UGI as set forth in SEQ ID NO: 553. In some embodiments, the UGI comprises the following amino acid sequence: >sp|P14739|UNGI_BPPB2 Uracil-DNA glycosylase inhibitor MTNLSDIIEKETGKQLVIQESILMLPEEVEEVIGNKPESDILVHTAYDESTDENVMLLTSD APEYKPWALVIQDSNGENKIKML (SEQ ID NO: 553)
Suitable UGI protein and nucleotide sequences are provided herein and additional suitable UGI sequences are known to those in the art, and include, for example, those published in Wang et al., Uracil-DNA glycosylase inhibitor gene of bacteriophage PBS2 encodes a binding protein specific for uracil-DNA glycosylase. J. Biol. Chem. 264:1163-1171(1989); Lundquist et al., Site-directed mutagenesis and characterization of uracil-DNA glycosylase inhibitor protein. Role of specific carboxylic amino acids in complex formation with Escherichia coli uracil-DNA glycosylase. J. Biol. Chem. 272:21408-21419(1997); Ravishankar et al., X-ray analysis of a complex of Escherichia coli uracil DNA glycosylase (EcUDG) with a proteinaceous inhibitor. The structure elucidation of a prokaryotic UDG. Nucleic Acids Res. 26:4880-4887(1998); and Putnam et al., Protein mimicry of DNA from crystal structures of the uracil-DNA glycosylase inhibitor protein and its complex with Escherichia coli uracil-DNA glycosylase. J. Mol. Biol. 287:331-346(1999), the entire contents of each are incorporated herein by reference.
It should be appreciated that additional proteins may be uracil glycosylase inhibitors. For example, other proteins that are capable of inhibiting (e.g., sterically blocking) a uracil-DNA glycosylase base-excision repair enzyme are within the scope of this disclosure. In some embodiments, a uracil glycosylase inhibitor is a protein that binds DNA. In some embodiments, a uracil glycosylase inhibitor is a protein that binds single-stranded DNA. For example, a uracil glycosylase inhibitor may be a Erwinia tasmaniensis single-stranded binding protein. In some embodiments, the single-stranded binding protein comprises the amino acid sequence (SEQ ID NO: 303). In some embodiments, a uracil glycosylase inhibitor is a protein that binds uracil. In some embodiments, a uracil glycosylase inhibitor is a protein that binds uracil in DNA. In some embodiments, a uracil glycosylase inhibitor is a catalytically inactive uracil DNA-glycosylase protein. In some embodiments, a uracil glycosylase inhibitor is a catalytically inactive uracil DNA-glycosylase protein that does not excise uracil from the DNA. For example, a uracil glycosylase inhibitor is a UdgX. In some embodiments, the UdgX comprises the amino acid sequence (SEQ ID NO: 304). As another example, a uracil glycosylase inhibitor is a catalytically inactive UDG. In some embodiments, a catalytically inactive UDG comprises the amino acid sequence (SEQ ID NO: 305). It should be appreciated that other uracil glycosylase inhibitors would be apparent to the skilled artisan and are within the scope of this disclosure.
Erwinia tasmaniensis SSB (themostable single-
High Fidelity Cas9
Some aspects of the disclosure provide high fidelity Cas9 proteins. In some embodiments, high fidelity Cas9 proteins have decreased electrostatic interactions between the Cas9 protein and a sugar-phosphate backbone of a DNA, as compared to a wild-type Cas9 domain. In some embodiments, any of the Cas9 proteins provided herein comprise one or more mutations that decrease the association between the Cas9 protein and a sugar-phosphate backbone of a DNA. In some embodiments, any of the Cas9 proteins provided herein comprise one or more mutations that decrease the association between the Cas9 protein and a sugar-phosphate backbone of a DNA by at least 5%, at least 10%, at least 15%, at least 20%, at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, or at least 95%. In some embodiments, any of the Cas9 proteins provided herein comprise one or more of a N497X, a R661X, a Q695X, and/or a Q926X mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X is any amino acid. In some embodiments, any of the Cas9 proteins provided herein comprise one or more of a N497A, a R661A, a Q695A, and/or a Q926A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises a D10A mutation of the amino acid sequence provided in SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the Cas9 protein comprises the amino acid sequence as set forth in SEQ ID NO: 306. High fidelity Cas9 proteins have been described in the art and would be apparent to the skilled artisan. For example, high fidelity Cas9 proteins have been described in Kleinstiver, B. P., et al. “High-fidelity CRISPR-Cas9 nucleases with no detectable genome-wide off-target effects.” Nature 529, 490-495 (2016); and Slaymaker, I. M., et al. “Rationally engineered Cas9 nucleases with improved specificity.” Science 351, 84-88 (2015); the entire contents of each are incorporated herein by reference. It should be appreciated that, based on the present disclosure and knowledge in the art, that mutations in any Cas9 protein may be generated to make high fidelity Cas9 proteins that have decreased electrostatic interactions between the Cas9 protein and a sugar-phosphate backbone of a DNA, as compared to a wild-type Cas9 domain.
Cas9 domain where mutations relative to Cas9 of SEQ ID NO: 9 are shown in bold and underlines.
Cas9 Proteins with Reduced PAM Exclusivity
Some aspects of the disclosure provide Cas9 proteins that have different PAM specificities. Typically, Cas9 proteins, such as Cas9 from S. pyogenes (spCas9), require a canonical NGG PAM sequence to bind a particular nucleic acid region. This may limit the ability to of the Cas9 protein to bind to a particular nucleotide sequence within a genome. Accordingly, in some embodiments, any of the Cas proteins provided herein may be capable of binding a nucleotide sequence that does not contain a canonical (e.g., NGG) PAM sequence. For example, Cas9 proteins that bind non-canonical PAM sequences have been described in Kleinstiver, B. P., et al., “Engineered CRISPR-Cas9 nucleases with altered PAM specificities” Nature 523, 481-485 (2015); and Kleinstiver, B. P., et al., “Broadening the targeting range of Staphylococcus aureus CRISPR-Cas9 by modifying PAM recognition” Nature Biotechnology 33, 1293-1298 (2015); the entire contents of each are hereby incorporated by reference.
In some embodiments, the Cas9 protein is a Cas9 protein from Staphylococcus aureus (SaCas9). In some embodiments, the SaCas9 protein is a nuclease active SaCas9, a nuclease inactive SaCas9 (SaCas9d), or a SaCas9 nickase (SaCas9n). In some embodiments, the SaCas9 comprises the amino acid sequence SEQ ID NO: 307. In some embodiments, the SaCas9 comprises a N579X mutation of SEQ ID NO: 307, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 9-262, wherein X is any amino acid except for N. In some embodiments, the SaCas9 comprises a N579A mutation of SEQ ID NO: 307, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the SaCas9 protein, the SaCas9d protein, or the SaCas9n protein can bind to a nucleic acid sequence having a non-canonical PAM. In some embodiments, the SaCas9 protein, the SaCas9d protein, or the SaCas9n protein can bind to a nucleic acid sequence having a NNGRRT PAM sequence. In some embodiments, the SaCas9 protein comprises one or more of a E781X, N967X, or R1014X mutation of SEQ ID NO: 307, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X is any amino acid. In some embodiments, the SaCas9 protein comprises one or more of a E781K, N967K, or R1014H mutation of SEQ ID NO: 307, or one or more corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the SaCas9 protein comprises a E781K, a N967K, and a R1014H mutation of SEQ ID NO: 307, or corresponding mutations in any of the amino acid sequences provided in SEQ ID NOs: 10-262. It should be appreciated that these mutations may be combined with any of the other mutations provided herein
In some embodiments, the Cas9 protein of any of the fusion proteins provided herein comprises an amino acid sequence that is at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to any one of SEQ ID NOs: 307-309. In some embodiments, the Cas9 protein of any of the fusion proteins provided herein comprises the amino acid sequence of any one of SEQ ID NOs: 307-309. In some embodiments, the Cas9 protein of any of the fusion proteins provided herein consists of the amino acid sequence of any one of SEQ ID NOs: 307-309.
Residue N579 of SEQ ID NO: 307, which is underlined and in bold, may be mutated (e.g., to a A579) to yield a SaCas9 nickase.
Residue A579 of SEQ ID NO: 308, which can be mutated from N579 of SEQ ID NO: 307 to yield a SaCas9 nickase, is underlined and in bold.
Residue A579 of SEQ ID NO: 309, which can be mutated from N579 of SEQ ID NO: 307 to yield a SaCas9 nickase, is underlined and in bold. Residues K781, K967, and H1014 of SEQ ID NO: 309, which can be mutated from E781, N967, and R1014 of SEQ ID NO: 307 to yield a SaKKH Cas9 are underlined and in italics.
In some embodiments, the Cas9 protein is a Cas9 protein from Streptococcus pyogenes (SpCas9). In some embodiments, the SpCas9 protein is a nuclease active SpCas9, a nuclease inactive SpCas9 (SpCas9d), or a SpCas9 nickase (SpCas9n). In some embodiments, the SpCas9 comprises the amino acid sequence SEQ ID NO: 9. In some embodiments, the SpCas9 comprises a D10X mutation of SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X is any amino acid except for D. In some embodiments, the SpCas9 comprises a D10A mutation of SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the SpCas9 protein, the SpCas9d protein, or the SpCas9n protein can bind to a nucleic acid sequence having a non-canonical PAM. In some embodiments, the SpCas9 protein, the SpCas9d protein, or the SpCas9n protein can bind to a nucleic acid sequence having a NGG, a NGA, or a NGCG PAM sequence. In some embodiments, the SpCas9 protein comprises one or more of a D1135X, R1335X, and T1337X mutation of SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X is any amino acid. In some embodiments, the SpCas9 protein comprises one or more of a D1135E, R1335Q, and T1337R mutation of SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the SpCas9 protein comprises a D1135E, a R1335Q, and a T1335R mutation of SEQ ID NO: 9, or corresponding mutations in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the SpCas9 protein comprises one or more of a D1135X, R1335X, and T1337X mutation of SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X is any amino acid. In some embodiments, the SpCas9 protein comprises one or more of a D1135V, R1335Q, and T1337R mutation of SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the SpCas9 protein comprises a D1135V, a R1335Q, and a T1337R mutation of SEQ ID NO: 9, or corresponding mutations in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the SpCas9 protein comprises one or more of a D1135X, G1218X, R1335X, and T1337X mutation of SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262, wherein X is any amino acid. In some embodiments, the SpCas9 protein comprises one or more of a D1135V, G1218R, R1335Q, and T1337R mutation of SEQ ID NO: 9, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 10-262. In some embodiments, the SpCas9 protein comprises a D1135V, a G1218R, a R1335Q, and a T1337R mutation of SEQ ID NO: 9, or corresponding mutations in any of the amino acid sequences provided in SEQ ID NOs: 10-262. It should be appreciated that these mutations may be combined with any of the other mutations provided herein
In some embodiments, the Cas9 protein of any of the fusion proteins provided herein comprises an amino acid sequence that is at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or at least 99.5% identical to any one of SEQ ID NOs: 9, 310-313. In some embodiments, the Cas9 domain of any of the fusion proteins provided herein comprises the amino acid sequence of any one of SEQ ID NOs: 9, 310-313. In some embodiments, the Cas9 domain of any of the fusion proteins provided herein consists of the amino acid sequence of any one of SEQ ID NOs: 9, 310-313.
Residues E1134, Q1334, and R1336 of SEQ ID NO: 311, which can be mutated from D1134, R1334, and T1336 of SEQ ID NO: 9 to yield a SpEQR Cas9, are underlined and in bold.
Residues V1134, Q1334, and R1336 of SEQ ID NO: 312, which can be mutated from D1134, R1334, and T1336 of SEQ ID NO: 9 to yield a SpVQR Cas9, are underlined and in bold.
Residues V1134, R1217, Q1334, and R1336 of SEQ ID NO: 313, which can be mutated from D1134, G1217, R1334, and T1336 of SEQ ID NO: 9 to yield a SpVRER Cas9, are underlined and in bold.
Cas9 Complexes with Guide RNAs
Some aspects of this disclosure provide complexes comprising a Cas9 protein or a Cas9 fusion protein as provided herein, and a guide RNA bound to the Cas9 protein or the Cas9 fusion protein. In some embodiments, the guide RNA is about 15-100 nucleotides long and comprises a sequence of at least 10 contiguous nucleotides that is complementary to a target sequence. In some embodiments, the guide RNA is 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 nucleotides long. In some embodiments, the guide RNA comprises a sequence of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 contiguous nucleotides that is complementary to a target sequence. In some embodiments, the target sequence is a DNA sequence. In some embodiments, the target sequence is a sequence in the genome of a mammal. In some embodiments, the target sequence is a sequence in the genome of a human. In some embodiments, the 3′ end of the target sequence is not immediately adjacent to the canonical PAM sequence (5′-NGG-3′).
Some aspects of the disclosure provide complexes comprising a first guide RNA bound to a Cas9 protein of a fusion protein, and a second guide RNA bound to a second Cas9 protein of the fusion protein. In some embodiments, the first guide RNA is about 15-100 nucleotides long and comprises a sequence of at least 10 contiguous nucleotides that is complementary to a first target sequence and the second guide RNA is about 15-100 nucleotides long and comprises a sequence of at least 10 contiguous nucleotides that is complementary to a second target sequence. In some embodiments, the first guide RNA and/or the second guide RNA is 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 nucleotides long. In some embodiments, the first guide RNA and the second guide RNA are different. In some embodiments, the first guide RNA comprises a sequence of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 contiguous nucleotides that is complementary to a first target sequence and wherein the second guide RNA comprises a sequence of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 contiguous nucleotides that is complementary to a second target sequence.
In some embodiments, first target sequence and the second target sequence are different. In some embodiments, the first target sequence and the second target sequence are DNA sequences. In some embodiments, the first target sequence and the second target sequence are in the genome of a mammal. In some embodiments, the first target sequence and the second target sequence are in the genome of a human. In some embodiments, the first target sequence is within at least 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 150, or 200 nucleotides of the second target sequence. In some embodiments, the 3′-end of the first target sequence is not immediately adjacent to the canonical PAM sequence (5′-NGG-3′). In some embodiments, the 3′-end of the second target sequence is not immediately adjacent to the canonical PAM sequence (5′-NGG-3′).
Methods of Using Cas9 Fusion Proteins
Some aspects of this disclosure provide methods of using the Cas9 proteins, fusion proteins, or complexes provided herein. For example, some aspects of this disclosure provide methods comprising contacting a DNA molecule (a) with any of the the Cas9 proteins or fusion proteins provided herein, and with at least one guide RNA, wherein the guide RNA is about 15-100 nucleotides long and comprises a sequence of at least 10 contiguous nucleotides that is complementary to a target sequence; or (b) with a Cas9 protein, a Cas9 fusion protein, or a Cas9 protein or fusion protein complex with at least one gRNA as provided herein. In some embodiments, the 3′ end of the target sequence is not immediately adjacent to the canonical PAM sequence (5′-NGG-3′). In some embodiments, the 3′ end of the target sequence is immediately adjacent to an AGC, GAG, TTT, GTG, or CAA sequence.
In some embodiments, the target DNA sequence comprises a sequence associated with a disease or disorder. In some embodiments, the target DNA sequence comprises a point mutation associated with a disease or disorder. In some embodiments, the activity of the Cas9 protein, the Cas9 fusion protein, or the complex results in a correction of the point mutation. In some embodiments, the target DNA sequence comprises a T→C point mutation associated with a disease or disorder, and wherein the deamination of the mutant C base results in a sequence that is not associated with a disease or disorder. In some embodiments, the target DNA sequence encodes a protein and wherein the point mutation is in a codon and results in a change in the amino acid encoded by the mutant codon as compared to the wild-type codon. In some embodiments, the deamination of the mutant C results in a change of the amino acid encoded by the mutant codon. In some embodiments, the deamination of the mutant C results in the codon encoding the wild-type amino acid. In some embodiments, the contacting is in vivo in a subject. In some embodiments, the subject has or has been diagnosed with a disease or disorder. In some embodiments, the disease or disorder is cystic fibrosis, phenylketonuria, epidermolytic hyperkeratosis (EHK), Charcot-Marie-Toot disease type 4J, neuroblastoma (NB), von Willebrand disease (vWD), myotonia congenital, hereditary renal amyloidosis, dilated cardiomyopathy (DCM), hereditary lymphedema, familial Alzheimer's disease, HIV, Prion disease, chronic infantile neurologic cutaneous articular syndrome (CINCA), desmin-related myopathy (DRM), a neoplastic disease associated with a mutant PI3KCA protein, a mutant CTNNB1 protein, a mutant HRAS protein, or a mutant p53 protein.
Some embodiments provide methods for using the Cas9 DNA editing fusion proteins provided herein. In some embodiments, the fusion protein is used to introduce a point mutation into a nucleic acid by deaminating a target nucleobase, e.g., a C residue. In some embodiments, the deamination of the target nucleobase results in the correction of a genetic defect, e.g., in the correction of a point mutation that leads to a loss of function in a gene product. In some embodiments, the genetic defect is associated with a disease or disorder, e.g., a lysosomal storage disorder or a metabolic disease, such as, for example, type I diabetes. In some embodiments, the methods provided herein are used to introduce a deactivating point mutation into a gene or allele that encodes a gene product that is associated with a disease or disorder. For example, in some embodiments, methods are provided herein that employ a Cas9 DNA editing fusion protein to introduce a deactivating point mutation into an oncogene (e.g., in the treatment of a proliferative disease). A deactivating mutation may, in some embodiments, generate a premature stop codon in a coding sequence, which results in the expression of a truncated gene product, e.g., a truncated protein lacking the function of the full-length protein.
In some embodiments, the purpose of the methods provide herein is to restore the function of a dysfunctional gene via genome editing. The Cas9 deaminase fusion proteins provided herein can be validated for gene editing-based human therapeutics in vitro, e.g., by correcting a disease-associated mutation in human cell culture. It will be understood by the skilled artisan that the fusion proteins provided herein, e.g., the fusion proteins comprising a Cas9 domain and a nucleic acid deaminase domain can be used to correct any single point T→C or A→G mutation. In the first case, deamination of the mutant C back to U corrects the mutation, and in the latter case, deamination of the C that is base-paired with the mutant G, followed by a round of replication, corrects the mutation.
An exemplary disease-relevant mutation that can be corrected by the provided fusion proteins in vitro or in vivo is the H1047R (A3140G) polymorphism in the PI3KCA protein. The phosphoinositide-3-kinase, catalytic alpha subunit (PI3KCA) protein acts to phosphorylate the 3-OH group of the inositol ring of phosphatidylinositol. The PI3KCA gene has been found to be mutated in many different carcinomas, and thus it is considered to be a potent oncogene.50 In fact, the A3140G mutation is present in several NCI-60 cancer cell lines, such as, for example, the HCT116, SKOV3, and T47D cell lines, which are readily available from the American Type Culture Collection (ATCC).51
In some embodiments, a cell carrying a mutation to be corrected, e.g., a cell carrying a point mutation, e.g., an A3140G point mutation in exon 20 of the PI3KCA gene, resulting in a H1047R substitution in the PI3KCA protein, is contacted with an expression construct encoding a Cas9 deaminase fusion protein and an appropriately designed sgRNA targeting the fusion protein to the respective mutation site in the encoding PI3KCA gene. Control experiments can be performed where the sgRNAs are designed to target the fusion enzymes to non-C residues that are within the PI3KCA gene. Genomic DNA of the treated cells can be extracted, and the relevant sequence of the PI3KCA genes PCR amplified and sequenced to assess the activities of the fusion proteins in human cell culture.
It will be understood that the example of correcting point mutations in PI3KCA is provided for illustration purposes and is not meant to limit the instant disclosure. The skilled artisan will understand that the instantly disclosed DNA-editing fusion proteins can be used to correct other point mutations and mutations associated with other cancers and with diseases other than cancer including other proliferative diseases.
The successful correction of point mutations in disease-associated genes and alleles opens up new strategies for gene correction with applications in therapeutics and basic research. Site-specific single-base modification systems like the disclosed fusions of Cas9 and deaminase enzymes or domains also have applications in “reverse” gene therapy, where certain gene functions are purposely suppressed or abolished. In these cases, site-specifically mutating Trp (TGG), Gln (CAA and CAG), or Arg (CGA) residues to premature stop codons (TAA, TAG, TGA) can be used to abolish protein function in vitro, ex vivo, or in vivo.
The instant disclosure provides methods for the treatment of a subject diagnosed with a disease associated with or caused by a point mutation that can be corrected by a Cas9 DNA editing fusion protein provided herein. For example, in some embodiments, a method is provided that comprises administering to a subject having such a disease, e.g., a cancer associated with a PI3KCA point mutation as described above, an effective amount of a Cas9 deaminase fusion protein that corrects the point mutation or introduces a deactivating mutation into the disease-associated gene. In some embodiments, the disease is a proliferative disease. In some embodiments, the disease is a genetic disease. In some embodiments, the disease is a neoplastic disease. In some embodiments, the disease is a metabolic disease. In some embodiments, the disease is a lysosomal storage disease. Other diseases that can be treated by correcting a point mutation or introducing a deactivating mutation into a disease-associated gene will be known to those of skill in the art, and the disclosure is not limited in this respect.
The instant disclosure provides methods for the treatment of additional diseases or disorders, e.g., diseases or disorders that are associated or caused by a point mutation that can be corrected by deaminase-mediated gene editing. Some such diseases are described herein, and additional suitable diseases that can be treated with the strategies and fusion proteins provided herein will be apparent to those of skill in the art based on the instant disclosure. Exemplary suitable diseases and disorders are listed below. It will be understood that the numbering of the specific positions or residues in the respective sequences depends on the particular protein and numbering scheme used. Numbering might be different, e.g., in precursors of a mature protein and the mature protein itself, and differences in sequences from species to species may affect numbering. One of skill in the art will be able to identify the respective residue in any homologous protein and in the respective encoding nucleic acid by methods well known in the art, e.g., by sequence alignment and determination of homologous residues. Exemplary suitable diseases and disorders include, without limitation, cystic fibrosis (see, e.g., Schwank et al., Functional repair of CFTR by CRISPR/Cas9 in intestinal stem cell organoids of cystic fibrosis patients. Cell stem cell. 2013; 13: 653-658; and Wu et. al., Correction of a genetic disease in mouse via use of CRISPR-Cas9. Cell stem cell. 2013; 13: 659-662, neither of which uses a deaminase fusion protein to correct the genetic defect); phenylketonuria—e.g., phenylalanine to serine mutation at position 835 (mouse) or 240 (human) or a homologous residue in phenylalanine hydroxylase gene (T>C mutation)—see, e.g., McDonald et al., Genomics. 1997; 39:402-405; Bernard-Soulier syndrome (BSS)—e.g., phenylalanine to serine mutation at position 55 or a homologous residue, or cysteine to arginine at residue 24 or a homologous residue in the platelet membrane glycoprotein IX (T>C mutation)—see, e.g., Noris et al., British Journal of Haematology. 1997; 97: 312-320, and Ali et al., Hematol. 2014; 93: 381-384; epidermolytic hyperkeratosis (EHK)—e.g., leucine to proline mutation at position 160 or 161 (if counting the initiator methionine) or a homologous residue in keratin 1 (T>C mutation)—see, e.g., Chipev et al., Cell. 1992; 70: 821-828, see also accession number P04264 in the UNIPROT database at www[dot]uniprot[dot]org; chronic obstructive pulmonary disease (COPD)—e.g., leucine to proline mutation at position 54 or 55 (if counting the initiator methionine) or a homologous residue in the processed form of α1-antitrypsin or residue 78 in the unprocessed form or a homologous residue (T>C mutation)—see, e.g., Poller et al., Genomics. 1993; 17: 740-743, see also accession number P01011 in the UNIPROT database; Charcot-Marie-Toot disease type 4J—e.g., isoleucine to threonine mutation at position 41 or a homologous residue in
The instant disclosure provides lists of genes comprising pathogenic T>C or A>G mutations, which may be corrected using any of the Cas9 fusion proteins provided herein. Provided herein, are the names of these genes, their respective SEQ ID NOs, their gene IDs, and sequences flanking the mutation site. See Tables 4 and 5. Without wishing to be bound by any particular theory, the mutations provided in Tables 4 and 5 may be corrected using the Cas9 fusions provided herein, which are able to bind to target sequences lacking the canonical PAM sequence. In some embodiments, a Cas9-deaminase fusion protein demonstrates activity on non-canonical PAMs and therefore can correct all the pathogenic T>C or A>G mutations listed in Tables 4 and 5 (SEQ ID NOs: 674-2539 and 3144-5083), respectively. In some embodiments, a Cas9-deaminase fusion protein recognizes canonical PAMs and therefore can correct the pathogenic T>C or A>G mutations with canonical PAMs, e.g., 5′-NGG-3′. It should be appreciated that a skilled artisan would understand how to design an RNA (e.g., a gRNA) to target any of the Cas9 proteins or fusion proteins provided herein to any target sequence in order to correct any of the mutations provided herein, for example, the mutations provided in Tables 4 and 5. It will be apparent to those of skill in the art that in order to target a Cas9:effector domain fusion protein as disclosed herein to a target site, e.g., a site comprising a point mutation to be edited, it is typically necessary to co-express the Cas9:effector domain fusion protein together with a guide RNA, e.g., an sgRNA. As explained in more detail elsewhere herein, a guide RNA typically comprises a tracrRNA framework allowing for Cas9 binding, and a guide sequence, which confers sequence specificity to the Cas9:effector domain fusion protein. In some embodiments, the guide RNA comprises a structure 5′-[guide sequence]-guuuuagagcuagaaauagcaaguuaaaauaaaggcuaguccguuaucaacuugaaaaaguggcaccgagucggugcuuuuu-3′ (SEQ ID NO: 285), wherein the guide sequence comprises a sequence that is complementary to the target sequence. The guide sequence is typically 20 nucleotides long. The sequences of suitable guide RNAs for targeting Cas9:effector domain fusion proteins to specific genomic target sites will be apparent to those of skill in the art based on the instant disclosure. Such suitable guide RNA sequences typically comprise guide sequences that are complementary to a nucleic sequence within 50 nucleotides upstream or downstream of the target nucleotide to be edited.
Kits, Vectors, Cells
Some aspects of this disclosure provide kits comprising a nucleic acid construct, comprising (a) a nucleotide sequence encoding a Cas9 protein or a Cas9 fusion protein as provided herein; and (b) a heterologous promoter that drives expression of the sequence of (a). In some embodiments, the kit further comprises an expression construct encoding a guide RNA backbone, wherein the construct comprises a cloning site positioned to allow the cloning of a nucleic acid sequence identical or complementary to a target sequence into the guide RNA backbone.
Some aspects of this disclosure provide polynucleotides encoding a Cas9 protein of a fusion protein as provided herein. Some aspects of this disclosure provide vectors comprising such polynucleotides. In some embodiments, the vector comprises a heterologous promoter driving expression of polynucleotide.
Some aspects of this disclosure provide cells comprising a Cas9 protein, a fusion protein, a nucleic acid molecule, and/or a vector as provided herein.
The description of exemplary embodiments of the reporter systems herein is provided for illustration purposes only and not meant to be limiting. Additional reporter systems, e.g., variations of the exemplary systems described in detail above, are also embraced by this disclosure.
Building PAM Libraries. Four different protospacer target sequences were synthesized: Doench 1-5′-AAGAGAGACAGTACATGCCC-3′(SEQ ID NO: 286);
Doench 2-5′-GGAGCCCACCGAGTACCTGG-3′(SEQ ID NO: 287); G7′-5′-AGTCTCCTCAGCAAAACGAA-3′(SEQ ID NO: 288); and VEGF Target 2-5′-GACCCCCTCCACCCCGCCTC-3′ (SEQ ID NO: 289). For each protospacer target sequence, a 3′-NNN PAM library was built. While the canonical PAM sequence is 5′-NGG-3′, (e.g., an exemplary [Doench 1]-[canonical PAM] target sequence could be 5′-[AAGAGAGACAGTACATGCCC]-[NGG]-3′ (SEQ ID NO: 291)), the 3′NNN PAM libraries for each protospacer target sequence contained a fully random PAM sequence, e.g., for Doench1 5′-AAGAGAGACAGTACATGCCCNNN-3′ (SEQ ID NO: 290), wherein N represents any nucleotide. The NNN PAM libraries thus included every possible combination of PAM sequences at the 3′ end of the respective protospacer target sequence.
Testing the Activity of Cas9 on PAM Libraries in a ω-dCas9 luciferase assay. Cas9 activity was tested using a bacterial luciferase activation assay in which a fusion protein of the ω subunit of Escherichia coli RNA polymerase (rpoZ) to dCas9 (see, e.g., Bikard et al., Nucleic Acids Res. 2013 August; 41(15): 7429-7437) drives the production of luciferase encoded by a nucleic acid under the control of a weak promoter comprising a sequence targeted by an sgRNA. Each PAM library was cloned into a plasmid comprising such a weak promoter, where the [target sequence]-[PAM library] nucleic acid sequences served as the sequence targeted by an sgRNA. A PAM library was cloned into the promoter for The w-dCas9 assay was run on all four protospacer targets for both the canonical PAM and the random PAM library.
Evolution of Cas9 on PAM Libraries. S. pyogenes dCas9 was fused to the ω unit of RNA polymerase. The resulting ω-dCas9 fusion protein was cloned into an M13 phage-based selection phagemid (SP), comprising the entire M13 phage genome except for a functional version of the gene encoding pIII, a gene essential for the generation of infectious phage particles. The phage gene encoding pIII was provided on a separate plasmid (accessory plasmid, AP), under the control of a promoter that is transcriptionally activated by ω-dCas9. The PAM library was cloned into the promoter region of the accessory plasmid. Host cells used for the directed evolution of Cas9 proteins without PAM restriction were provided that harbored the accessory plasmid. Upon infection with a selection phage, the amount of infectious phage particles produced by a given host cell thus depends on the activity of the ω-dCas9 fusion protein encoded by the selection phage on the promoter of the accessory plasmid, which is required for the production of pIII protein. The accessory plasmid thus confers a selective advantage to those selection phages encoding ω-dCas9 fusion protein variants with an increased activity on different non-canonical PAM sequences.
A lagoon was provided and a flow of host cells comprising the accessory plasmid was generated through the lagoon. The host cells were contacted with the selection phagemid, resulting in a population of selection phage propagating in the flow of host cells in the lagoon. Phage-infected host cells were removed from the lagoon and fresh, uninfected host cells were fed into the lagoon at a rate resulting in the average time a host cell remained in the lagoon being shorter than the average time between cell division of the host cells, but longer than the average M13 phage life cycle time.
In order to generate Cas9 variants during a directed evolution experiment, the host cells in the lagoon were incubated under conditions resulting in an increased mutation rate. The host cells were harboring a mutagenesis plasmid (MP), which increased the mutagenesis rate, thus introducing mutations in the ω-dCas9 fusion protein encoded by the selection phagemid during the phage life cycle. Because the flow rate of host cells through the lagoon results in the average time a host cell remains in the lagoon being shorter than the average time between host cell divisions, the host cells in the lagoon cannot accumulate mutations resulting from the increased mutation rate conferred by the mutagenesis plasmid in their genome or on the accessory plasmid. The selection phage, however, replicate in the lagoon in the flow of host cells and thus accumulate mutations over time, resulting in the generation of new, evolved ω-dCas9 fusion protein variants.
If any of these evolved ω-dCas9 fusion protein variants includes a mutation that confers an increased activity on the accessory plasmid comprising the PAM library, this will directly translate into the generation of more pIII by a host cell infected with a selection phage encoding the respective ω-dCas9 fusion protein variant. The production of more pIII will, in turn, result in the generation of more infectious selection phage particles, which, over time, results in a competitive advantage of the mutant selection phage harboring such beneficial mutations over selection phage not harboring such mutations. After a period of time, the selective pressure exerted by the accessory plasmid will, therefore, result in selection phage having acquired beneficial mutations being the predominant species replicating in the flow of host cells, while selection phage with no mutations or with detrimental mutations will be washed out of the lagoon.
Because the ω-dCas9 fusion protein activity on the PAM library was very low at the beginning of the experiment, multiple rounds of overnight propagation of the selection phagemid in host cells harboring an accessory plasmid containing the PAM library were carried out to evolve Cas9 variants that show increased activity on noncanonical PAM sequences. At the end of a directed evolution experiment, the evolved population of selection phage was isolated from the lagoon, and a representative number of clones was analyzed to detect Cas9 variants having beneficial mutations. While all mutations observed confer a beneficial phenotype, mutations shared by more than one clone, or by all clones, are of particular interest.
Mutations from Cas9 PACE. A number of selection phage clones was isolated from a directed evolution experiment using a PAM library accessory plasmid as described above. The mutations identified in the Cas9 amino acid sequence of some exemplary clones is provided below in Table 1(residue numbering according to SEQ ID NO: 9):
Clones 1-4 were tested in the ω-dCas9 luciferase activation assay described above. When tested on the PAM library as a whole, the different clones showed an improvement in luciferase expression (
Improvement of Cas9 activity on non-canonical PAM sequences. The activity of evolved Cas9 proteins on target sequences with noncanonical PAMs was evaluated in more detail. The relative activity of Clone 4, harboring 1122, D182, and E1219V mutations, for various [Doench 2 (5′-GGAGCCCACCGAGTACCTGG-3′ (SEQ ID NO: 287))]-[PAM] target sequences was tested in the ω-dCas9 luciferase activation assay and compared to the activity of wild-type dCas9.
Improvement of Cas9 activity on non-canonical PAM sequences. The activity of evolved Cas9 proteins on target sequences with noncanonical PAMs was evaluated in more detail. The relative activity of Clone 4, harboring 1122, D182, and E1219V mutations, for various [Doench 2 (5′-GGAGCCCACCGAGTACCTGG-3′(SEQ ID NO: 287))]-[PAM] target sequences was tested in the ω-dCas9 luciferase activation assay and compared to the activity of wild-type dCas9. The data are shown in Table 2.
Because the activity of the ω-dCas9 fusion protein on the NNN-PAM libraries was very low, a second round of PACE experiments was performed, in which an initial phase of diversification of the ω-dCas9 fusion protein population was carried out in the absence of selective pressure by providing a source of pIII that did not depend on w-dCas9 fusion protein activity. The initial diversification stage allows mutations to develop that may not be accessible in a PACE experiment where selective pressure is applied throughout the experiment.
Selection phage harboring a w-dCas9 fusion protein with a dCas9 sequence provided as SEQ ID NO: 8 with D10A and H840A mutations was propagated overnight in 1030 host cells together with MP6 mutagenesis plasmid in the presence of arabinose in order to create a library of mutated selection phage encoding a library of ω-dCas9 fusion protein variants. PIII was expressed from a separate plasmid in the host cells during this initial diversification stage. After overnight (12 h) diversification, 1030 host cells harboring an accessory plasmid comprising an NNN PAM library cloned into a weak promoter as the guide RNA target sequence and a mutagenesis plasmid were grown to log phase, and used as the source of host cells to create a flow of host cells through a lagoon. The cells in the lagoon were infected with the diversified selection phage from the overnight incubation. The host cells in the lagoon were contacted with arabinose in order to maintain a high level of expression of the mutagenic genes from the mutagenesis plasmid.
The initial phage titers were about 108 pfu/mL. A PACE experiment was performed for each of the four NNN-PAM libraries ([Doench 1]-[NNN-PAM], [Doench 2]-[NNN-PAM], [G7]-[NNN-PAM], and [VEGF target]-[NNN-PAM] cloned into an accessory plasmid driving pIII expression from a weak promoter as described above. The phage titers were monitored during the PACE experiments. A slow drop in phage titers to 104 pfu/mL was observed. The phage population was isolated from the lagoon at that point, and grown on 2208 host cells containing a separate source of pIII (psp-driven pIII). After this low-stringency propagation period, a 1:100 dilution of the supernatant was added to fresh host cells harboring the accessory plasmid as the only source of pIII in a new lagoon, and the PACE experiments were continued. No drop in phage titers was observed after this low-stringency incubation in 2208 cells.
One exemplary PACE experiment that was run for 72 hours. After that period of time, 24 surviving clones were isolated from the lagoon, sequenced, and characterized. The mutations identified included A262T, K294R, S409I, M694I, E480K, E543D, and E1219V (amino acid numbering according to SEQ ID NO: 9). In another exemplary experiment, surviving clones were isolated after 15 days of incubation. Activity of the identified dVas9 mutants was characterized in a ω-dCas9 luciferase assay. Clones with the best ω-dCas9 fusion protein activity on noncanonical PAM target sequences had the following mutations: E480K, E543D, E1219V, and T1329.
Cas9 Mammalian GFP Activation. Both wild-type dCas9 (SEQ ID NO: 9) and the evolved Cas9 clones were tested in a dCas9-GFP assay in Hek293T cells. The cells were contacted with a reporter construct in which a GFP-encoding sequence was driven from a weak promoter that includes a [gRNA target sequence]-[PAM] sequence. Fusion proteins of dCas9 (wild-type and PACE variants) attached to the transcriptional activator VP64-p65-Rta (VPR) were generated, and the various dCas9-VPR variants were tested for their capacity to activate the GFP reporter in HEK293 cells.
Hek293T were transfected with four separate plasmids: a dCas9-VPR expression plasmid; a plasmid expressing the sgRNA targeting the gRNA target sequence of the GFP reporter plasmid; the GFP reporter plasmid; and an iRFP transfection control. In one experiment, the HEK293 cells were contacted with a GFP reporter included a TAA PAM, and in another experiment, the HEK293 cells were contacted with a population of reporter plasmids containing an NNN PAM library. Cells were harvested 48 hours after transfection and GFP expressing cells were quantified using a BD LSR-FORTESSA cell analyzer.
Evolved Cas9 Cutting Activity on Target Sequences with noncanonical PAM. In order to demonstrate that the PACE mutations universally confer Cas9 activity without PAM restriction, nuclease-active Cas9 proteins were generated based on the sequence provided in, i.e., without the D10A and H840A mutations, but harboring the various PACE mutations. The evolved Cas9 variants were tested in a Cas9 GFP assay, assessing the capacity of the evolved Cas9 protein variants to target and inactivate an emGFP gene integrated into the genome of HEK293 cells using a guide RNA targeting a sequence with a noncanonical PAM. It was observed that 6.45% of cells showed loss of GFP expression when contacted with a wild-type nuclease-active Cas9 (SEQ ID NO: 9), while 54.55% of cells contacted with the evolved Cas9 (E480K, E543D, E1219V, and T1329) showed a loss of GFP expression.
The beneficial mutations conferring Cas9 activity on noncanonical PAM sequences were mapped to a S. pyogenes wild-type sequence. Below is an exemplary Cas9 sequence (S. pyogenes Cas9 with D10 and H840 residues marked with an asterisk following the respective amino acid residues, SEQ ID NO: 9). The D10 and H840 residues of SEQ ID NO: 9 may be mutated to generate a nuclease inactive Cas9 (e.g., to D10A and H840A) or to generate a nickase Cas9 (e.g., to D10A with H840; or to D10 with H840A). The HNH domain (bold and underlined) and the RuvC domain (boxed) are identified. The residues found mutated in the clones isolated from the various PACE experiments, amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 are identified with an asterisk following the respective amino acid residue.
YLQNGRDMYVDQELDINRLSDYDVDH*IVPQSFLKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNYWRQLLN
The beneficial mutations conferring Cas9 activity on noncanonical PAM sequences were mapped to additional exemplary wild-type Cas9 sequences. The HNH domain (bold and underlined) and the RuvC domain (boxed) are identified. The residues homologous to the residues found mutated in SEQ ID NO: 9, amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 are identified with an asterisk following the respective amino acid residue. In addition, amino acid residues 10 and 840, which are mutated in dCas9 protein variants, are also identified by an asterisk.
LQNGRDMYVDQELDINRLSDYDVDH*IVPQSFIKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNYWRQLLNA
YLQNGRDMYVDQELDINRLSDYDVDH*IVPQSFLKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNYWRQLLN
NDRLYLYYLQNGKDMYTGDDLDIDRLSNYDIDH*IIPQAFLKDNSIDNKVLVSSASNRGKSDDFPSLEVVKKRKT
AKYLIEKIKLHDMQEGKCLYSLEAIPLEDLLNNPFNYEVDH*IIPRSVSFDNSFNNKVLVKQEEASKKGNRTPFQ
This disclosure provides Cas9 variants in which one or more of the amino acid residues identified by an asterisk are mutated as described herein. In some embodiments, the D10 and H840 residues are mutated, e.g., to an alanine residue, and the Cas9 variants provided include one or more additional mutations of the amino acid residues identified by an asterisk as provided herein. In some embodiments, the D10 residue is mutated, e.g., to an alanine residue, and the Cas9 variants provided include one or more additional mutations of the amino acid residues identified by an asterisk as provided herein.
A number of Cas9 sequences from various species were aligned to determine whether corresponding homologous amino acid residues can be identified in other Cas9 proteins, allowing the generation of Cas9 variants with corresponding mutations of the homologous amino acid residues. The alignment was carried out using the NCBI Constraint-based Multiple Alignment Tool (COBALT(accessible at st-va.ncbi.nlm.nih.gov/tools/cobalt), with the following parameters. Alignment parameters: Gap penalties −11,−1; End-Gap penalties −5,−1. CDD Parameters: Use RPS BLAST on; Blast E-value 0.003; Find Conserved columns and Recompute on. Query Clustering Parameters: Use query clusters on; Word Size 4; Max cluster distance 0.8; Alphabet Regular.
An exemplary alignment of four Cas9 sequences is provided below. The Cas9 sequences in the alignment are: Sequence 1 (S1): SEQ ID NO: 10|WP_0109222511 gi 4992247111 type II CRISPR RNA-guided endonuclease Cas9 [Streptococcus pyogenes]; Sequence 2 (S2): SEQ ID NO: 11|WP_039695303|gi 746743737|type II CRISPR RNA-guided endonuclease Cas9 [Streptococcus gallolyticus]; Sequence 3 (S3): SEQ ID NO: 12|WP_045635197|gi 782887988|type II CRISPR RNA-guided endonuclease Cas9 [Streptococcus mitis]; Sequence 4 (S4): SEQ ID NO: 13|5AXW_A|gi 924443546|Staphylococcus Aureus Cas9. The HNH domain (bold and underlined) and the RuvC domain (boxed) are identified for each of the four sequences. Amino acid residues 10, 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 840, 1219, and 1329 in S1 and the homologous amino acids in the aligned sequences are identified with an asterisk following the respective amino acid residue.
KRIEEGIKELGSQIL-------KEHPVENTQLQNEKLYLYYLQNGRDMYVDQELDINRLSD----YDVDH*IVPQSFLKDD
KKLQNSLKELGSNILNEEKPSYIEDKVENSHLQNDQLFLYYIQNGKDMYTGDELDIDHLSD----YDIDH*IIPQAFIKDD
KRIEDSLKILASGL---DSNILKENPTDNNQLQNDRLFLYYLQNGKDMYTGEALDINQLSS----YDIDH*IIPQAFIKDD
ERIEEIIRTTGK---------------ENAKYLIEKIKLHDMQEGKCLYSLEAIPLEDLLNNPFNYEVDH*IIPRSVSFDN
The alignment demonstrates that amino acid sequences and amino acid residues that are homologous to a reference Cas9 amino acid sequence or amino acid residue can be identified across Cas9 sequence variants, including, but not limited to Cas9 sequences from different species, by identifying the amino acid sequence or residue that aligns with the reference sequence or the reference residue using alignment programs and algorithms known in the art. This disclosure provides Cas9 variants in which one or more of the amino acid residues identified by an asterisk in SEQ ID NO: 9 are mutated as described herein. The residues in Cas9 sequences other than SEQ ID NO: 9 that correspond to the residues identified in SEQ ID NO: 9 by an asterisk are referred to herein as “homologous” or “corresponding” residues. Such homologous residues can be identified by sequence alignment, e.g., as described above, and by identifying the sequence or residue that aligns with the reference sequence or residue. Similarly, mutations in Cas9 sequences other than SEQ ID NO: 9 that correspond to mutations identified in SEQ ID NO: 9 herein, e.g., mutations of residues 10, 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 840, 1219, and 1329 in SEQ ID NO: 9, are referred to herein as “homologous” or “corresponding” mutations. For example, the mutations corresponding to the D10A mutation in S1 for the four aligned sequences above are D10A for S2, D9A for S3, and D13A for S4; the corresponding mutations for H840A in S1 are H850A for S2, H842A for S3, and H560 for S4; the corresponding mutation for X1219V in S1 are X1228V for S2, X1226 for S3, and X903V for S4, and so on.
A total of 250 Cas9 sequences (SEQ ID NOs: 10-262) from different species were aligned using the same algorithm and alignment parameters outlined above. Amino acid residues homologous to residues 10, 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 840, 1219, and 1329 were identified in the same manner as outlined above. The alignments are provided below. The HNH domain (bold and underlined) and the RuvC domain (boxed) are identified for each of the four sequences. Residues corresponding to amino acid residues 10, 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 840, 1219, and 1329 in SEQ ID NO: 9 are boxed in SEQ ID NO: 10 in the alignments, allowing for the identification of the corresponding amino acid residues in the aligned sequences.
Cas9 variants with one or more mutations in amino acid residues homologous to amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of SEQ ID NO: 9 are provided herein. In some embodiments, the Cas9 variants provided herein comprise mutations corresponding to the D10A and the H840A mutations in SEQ ID NO: 9, resulting in a nuclease-inactive dCas9, and at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations of amino acid residues homologous to amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of SEQ ID NO: 9.
Cas9 variants with one or more mutations in amino acid residues homologous to amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of SEQ ID NO: 9 are provided herein. In some embodiments, the Cas9 variants provided herein comprise mutations corresponding to the D10A mutations in SEQ ID NO: 9, resulting in a partially nuclease-inactive dCas9, wherein the Cas9 can nick the non-target strand but not the targeted strand, and at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations of amino acid residues homologous to amino acid residues 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 1219, and 1329 of SEQ ID NO: 9.
Additional suitable Cas9 sequences in which amino acid residues homologous to residues 10, 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 840, 1219, and/or 1329 of SEQ ID NO: 9 can be identified are known to those of skill in the art. See, e.g., Supplementary Table S2 and Supplementary Figure S2 of Fonfara et al., Phylogeny of Cas9 determines functional exchangeability of dual-RNA and Cas9 among orthologous type II CRISPR-Cas systems, Nucl. Acids Res. 2013, doi: 10.1093/nar/gkt1074, which are incorporated herein by reference in their entirety. Cas9 variants of the sequences provided herein or known in the art comprising one or more mutations, e.g., at least one, at least two, at least three, at least four, at least five, at least six, or at least seven mutations as provided herein, e.g., of one or more amino acid residue that is homologous to amino acid residue 10, 122, 137, 182, 262, 294, 409, 480, 543, 660, 694, 840, 1219, and/or 1329 in SEQ ID NO: 9 are provided by this disclosure, for example, Cas9 variants comprising a A262T, K294R, S409I, E480K, E543D, M694I, and/or E1219V mutation.
By evolving S. pyogenes Cas9 on a NNN PAM library using PACE, Cas9s with broadened PAM specificities have been evolved with higher activities for many non-canonical PAMs. Such a Cas9 still retains its native DNA binding and cutting activity and can be utilized with all of the current tools available. It has been hypothesized that by modulating Cas9's interactions with the DNA, the PAM specificity of Cas9 can be modified and expanded. Other Cas9s such as Staphylococcus aureus could also be engineered to change and expand their PAM specificity by such a method. Methods to modulate DNA binding such as targeted mutagenesis of the Cas9 protein, fusions to DNA-binding proteins, and the use of multiple Cas9 proteins tethered to each other could also expand the PAMs that can be targeted.
Cas9 Evolution. After evolution using overnight propagation of the phage with the mutagenesis plasmid (MP), the resultant phages containing mutations, discussed above, in PACE were used. Twenty-four individual phages were sequenced from the PACE run. Mutations found in the Cas9 gene are documented in Table 3 below. The Cas9 gene containing these mutations was cloned out of the phage and into plasmids to test both DNA binding and cutting activity.
GFP Activation in Human Cell Culture. Testing was performed on a reporter with a GFP reporter activated by dCas9-VPR. Testing was performed on 5′-NGG-3′ PAM first (
dCas9-VPR on all 64 PAM Sequences. pJH306 (WT dCas9-VPR) and pJH599 (WT dCas9-VPR with mutations A262T, S409I, E480K, E543D, M694I, and E1219V) were tested on all 64 PAM sequences (
In Vitro Cutting Assay. The ability of expressed and purified WT Cas9 (WT) and Cas 9 with an E1219V mutation (1) to cut DNA with different PAMs was tested (
Evolving Different Systems. In addition to S. pyogenes Cas9 evolution, other Cas9 systems such as S. aureus, S. thermophilus, N. meningitidis, and T. denticola, etc. can be evolved to modify and expand their PAM specificities. The data indicates that, by using a similar system to the S. pyogenes Cas9 evolution, a phage containing the S. aureus Cas9 can also be evolved to expand its PAM specificity.
Modulating PAM Specificity. By mutating neutral and negatively charged amino acids to positively charged amino acids, Cas9 could be modified to expand the PAMs that can be targeted. Generally, incorporating mutations into Cas9 proteins that generate a net increase in positive charge may increase the affinity of Cas9 to bind DNA. In combination with the Cas9 mutations provided herein, additional residues that could be mutated for increased PAM targeting in S. pyogenes Cas9 further include ones that have been identified to change the PAM specificity (D1135, G1218, R1333, R1335, T1337)38 and residues that can increase Cas9 activity (S845 and L847) 37. Residues that increase Cas9 specificity such as the mutations of arginine, histidine, and lysine to alanine previously identified37 and the mutations of asparagine, arginine, and glutamine to alanine as previously identified39 could lead to lower tolerability for non-canonical PAMs as these mutations presumably decrease the interactions between the Cas9 and DNA.
Fusions to Modulate PAM Specificity. Programmable DNA-binding proteins such as zinc-finger domains, TALEs, and other Cas9 proteins could be fused to Cas9 to improve the ability to target nucleotide sequences having canonical or non-canonical PAMs, for example to increase activity, specificity or efficiency. A nuclease-null dCas9 could be fused to a nuclease active Cas9 to increase the ability of the nuclease active Cas9 to target different PAM sequences. One example of a nuclease-null dCas9 fused to a nuclease active Cas9 is shown in
Using Cas9 to Localize Other Nucleases and Other DNA-Binding Proteins. Cas9 can also be used to overcome the native binding specificity of other proteins by localizing them to their DNA targets. DNA nucleases, recombinases, deaminases, and other effectors often have a native DNA specificity. Cas9 can be fused to these proteins to overcome and expand their native DNA specificities. gRNAs will target the Cas9 adjacent to the DNA effector's target site and will help to localize them to their target site.
dCas9-VPR on NNNNN PAM Library. To test that the evolved Cas9s had not picked up specificity in the 4th and 5th PAM positions, dCas9-VPR on a NNNNN PAM library was tested. As seen with the NNN library, most of the constructs (e.g., pJH562, pJ559, pJH600, pJH601, pJH602, pJH603, and pJH605) showed improved activity. pJH599 consistently showed improvement in both the percentage of cells that showed GFP activation (
Cas9 GFP Cutting. The WT Cas9, pJH407, was compared with a nuclease-positive evolved Cas9, pJH760 (
This disclosure further provides Cas9 fused with a DNA editing enzyme for the targeted editing of DNA sequences.
In E. coli, a library of PAM sequences are encoded in a plasmid that also contains an antibiotic gene. If the Cas9 can cut the PAM sequences on the plasmid, the plasmid is not replicated and is lost; only plasmids that are uncut remain the population. The plasmids that were cut by the Cas9 can be determined by sequencing the initial plasmid population and the final plasmid population through high throughput sequencing. The proportion of the library consisting of each PAM sequence was obtained by dividing the number of reads containing the PAM sequence by the total number of reads. The depletion score was then calculated by dividing the proportion of the library containing the PAM section before the selection by the proportion of the library containing the PAM sequence after selection. Higher depletion scores signify higher cutting activity by the Cas9 of that particular PAM sequence. The results of the PAM depletion assay are shown in
A number of PAM sequences that were not cut with the wild-type Cas9 were cut with the evolved Cas9 (xCas9 v1.0, pJH760). Notably, all PAM sequences of the form NGN and NNG, as well as GAA and GAT showed a depletion greater than 10-fold with the xCas9. A single G in either the second or third PAM position could be sufficient for cutting with the newly evolved Cas9, opening up the sequence space significantly for the target sites that can be targeted using Cas9. The PAM depletion scores are given in Table 4.
Wild-type or evolved Cas9 and gRNAs were transfected into mammalian cells containing a genomically integrated GFP gene. Different gRNAs targeted different sites with different PAM sequences, such that cutting of the GFP by Cas9 would lead to a loss of the GFP signal. The GFP signal was quantified after five days with flow cytometry. As shown in
As SpCas9 has a preference for the G residues at the second and third base, evolutation was continued using the end point from the last evolution on a HHH (H=A, C, or T) PAM library. After evolution, 13 colonies were sequenced and a number of new mutations were identified. Three mutations, the E1219V, E480K, and E543D mutations were found in all the clones. A number of the clones either had the S267G/K294R/Q1256K mutations or the A262T/S409I mutations but those mutations were never seen together, suggesting that the clones had taken two divergent paths along the evolutionary landscape. The new mutations are given in Table 5.
pJH760, described in Example 6, was tested in the PAM depletion assay on a number of new targets. Four new targets were selected: re2 (GGGGCCACTAGGGACAGGAT (SEQ ID NO: 314)), a synthetic target previously used for GFP activation in mammalian cells; VEGF (GGGTGGGGGGAGTTTGCTCC (SEQ ID NO: 315)), a target within the VEGF gene, CLTA (GCAGATGTAGTGTTTCCACA (SEQ ID NO: 316)), a target within the CLTA gene; and CCR5D (TCACTATGCTGCCGCCCAGT (SEQ ID NO: 317)), a target within the CCR5D gene. The results of the PAM depletion assay are given in
The HHH PAM library was further evolved using the end point from the last evolution on a HHH (H=A, C, or T) PAM library. After evolution, 13 colonies were sequenced and a number of new mutations were identified. Three mutations, the E1219V, E480K, and E543D mutations were found in all the clones. A number of the clones either had the K294R/Q1256K mutations or the A262T/S409I mutations but those mutations were never seen together, suggesting that the clones had taken two divergent paths along the evolutionary landscape. The new mutations are given in Tables 8 and 9 below.
As expected, variation in activity was seen with different targets. The PAM depletion assay scores are given in Table 10. NGN consistently showed cutting activity with some targets. Variation was seen amongst the xCas9 3.x mutants in terms of which mutant had the best activity. Of note, xCas9 3.3 contained the K294R/Q1256K series of mutations, while the other three mutants (3.6, 3.7, and 3.8) contained the A262T/S409I series of mutations. xCas9 3.6 and 3.7 outperformed 3.8. While 3.3 seemed to have the highest activity for most cases, 3.6 and 3.7 performed better on certain PAM sequences. The results of the PAM depletion assays for three of the new targets described above are given in
A NNNNN PAM depletion library was constructed. It was assayed to examine any fourth or fifth base specificity. Initial results of the PAM depletion assay show that there is no preference at the fourth and fifth base as expected.
In summary, E1219V was found to be one of the earliest mutations that fixed in the evaluation. It is close to the PAM sequence in the crystal structure. E480K and E543D were also seen in all of the clones from the early stages of the evolution, and may be important. K294R/Q1256K and A262T/S409I seem to be two divergent paths, and may be important. Their PAM sequence profiles seem to be slightly different, which implies their importance relative to PAM activity determination.
All publications, patents, patent applications, publication, and database entries (e.g., sequence database entries) mentioned herein, e.g., in the Background, Summary, Detailed Description, Examples, and/or References sections, are hereby incorporated by reference in their entirety as if each individual publication, patent, patent application, publication, and database entry was specifically and individually incorporated herein by reference. In case of conflict, the present application, including any definitions herein, will control.
Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents of the embodiments described herein. The scope of the present disclosure is not intended to be limited to the above description, but rather is as set forth in the appended claims.
Articles such as “a,” “an,” and “the” may mean one or more than one unless indicated to the contrary or otherwise evident from the context. Claims or descriptions that include “or” between two or more members of a group are considered satisfied if one, more than one, or all of the group members are present, unless indicated to the contrary or otherwise evident from the context. The disclosure of a group that includes “or” between two or more group members provides embodiments in which exactly one member of the group is present, embodiments in which more than one members of the group are present, and embodiments in which all of the group members are present. For purposes of brevity those embodiments have not been individually spelled out herein, but it will be understood that each of these embodiments is provided herein and may be specifically claimed or disclaimed.
It is to be understood that the invention encompasses all variations, combinations, and permutations in which one or more limitation, element, clause, or descriptive term, from one or more of the claims or from one or more relevant portion of the description, is introduced into another claim. For example, a claim that is dependent on another claim can be modified to include one or more of the limitations found in any other claim that is dependent on the same base claim. Furthermore, where the claims recite a composition, it is to be understood that methods of making or using the composition according to any of the methods of making or using disclosed herein or according to methods known in the art, if any, are included, unless otherwise indicated or unless it would be evident to one of ordinary skill in the art that a contradiction or inconsistency would arise.
Where elements are presented as lists, e.g., in Markush group format, it is to be understood that every possible subgroup of the elements is also disclosed, and that any element or subgroup of elements can be removed from the group. It is also noted that the term “comprising” is intended to be open and permits the inclusion of additional elements or steps. It should be understood that, in general, where an embodiment, product, or method is referred to as comprising particular elements, features, or steps, embodiments, products, or methods that consist, or consist essentially of, such elements, features, or steps, are provided as well. For purposes of brevity those embodiments have not been individually spelled out herein, but it will be understood that each of these embodiments is provided herein and may be specifically claimed or disclaimed.
Where ranges are given, endpoints are included. Furthermore, it is to be understood that unless otherwise indicated or otherwise evident from the context and/or the understanding of one of ordinary skill in the art, values that are expressed as ranges can assume any specific value within the stated ranges in some embodiments, to the tenth of the unit of the lower limit of the range, unless the context clearly dictates otherwise. For purposes of brevity, the values in each range have not been individually spelled out herein, but it will be understood that each of these values is provided herein and may be specifically claimed or disclaimed. It is also to be understood that unless otherwise indicated or otherwise evident from the context and/or the understanding of one of ordinary skill in the art, values expressed as ranges can assume any subrange within the given range, wherein the endpoints of the subrange are expressed to the same degree of accuracy as the tenth of the unit of the lower limit of the range.
In addition, it is to be understood that any particular embodiment of the present invention may be explicitly excluded from any one or more of the claims. Where ranges are given, any value within the range may explicitly be excluded from any one or more of the claims. Any embodiment, element, feature, application, or aspect of the compositions and/or methods of the invention, can be excluded from any one or more claims. For purposes of brevity, all of the embodiments in which one or more elements, features, purposes, or aspects is excluded are not set forth explicitly herein.
This application is a national stage filing under 35 U.S.C. § 371 of international PCT application, PCT/US2016/058345, filed Oct. 22, 2016, which claims priority under 35 U.S.C. § 119(e) to U.S. provisional patent applications, U.S. Ser. No. 62/245,828 filed Oct. 23, 2015, U.S. Ser. No. 62/279,346 filed Jan. 15, 2016, U.S. Ser. No. 62/311,763 filed Mar. 22, 2016, U.S. Ser. No. 62/322,178 filed Apr. 13, 2016, U.S. Ser. No. 62/357,352 filed Jun. 30, 2016, U.S. Ser. No. 62/370,700 filed Aug. 3, 2016, U.S. Ser. No. 62/398,490 filed Sep. 22, 2016, U.S. Ser. No. 62/408,686 filed Oct. 14, 2016, and U.S. Ser. No. 62/357,332 filed Jun. 30, 2016; each of which is incorporated herein by reference.
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| PCT/US2016/058345 | 10/22/2016 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
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