Patent Grant
11319532
Traditional genome editing methods introduce a double-stranded DNA break (DSB) at a genomic target locus (14). The cellular response to a DSB lesion primarily proceeds through nonhomologous end joining (NHEJ) and related processes (15). Although NHEJ usually rejoins the two ends flanking the DSB, under typical genome editing conditions DSBs are continuously reintroduced, eventually resulting in the accumulation of insertions and deletions (indels) or translocations at the site of the DSB and disruption of the corresponding genomic locus (16). Actively dividing cells can also respond to DSBs by initiating homology-directed repair (HDR) in the presence of a donor DNA template containing homology to the regions surrounding the DSB, which allows researchers to more precisely and predictably manipulate genomes than is possible through NHEJ (17). HDR-dependent genome editing is limited by low efficiency arising from competition with NHEJ outcomes, and from the dependence of HDR on mitosis (18).
The development of base editing, which enables the direct, irreversible conversion of a C:G base pair to a T:A base pair in a programmable manner without requiring HDR or the introduction of a DSB, was recently reported (1). Base editors contain a single-stranded DNA-specific cytidine deaminase enzyme tethered to a catalytically impaired Cas9 protein and a base excision repair inhibitor (1, 4, 9, 10). The Cas9 variant binds a genomic locus of interest, programmed by a corresponding guide RNA. Formation of the protein:RNA:DNA ternary “R-loop” complex (19) exposes a small (˜5-nt) window of single-stranded DNA that serves as a substrate for the tethered cytidine deaminase enzyme. Cytidines within this window may be hydrolytically deaminated to uracils, resulting in G:U intermediates.
Base excision repair (BER) is the cell's primary response to G:U mismatches and is initiated by excision of the uracil by uracil N-glycosylase (UNG)(20). In an effort to protect the edited G:U intermediate from excision by UNG, an 83-amino acid uracil glycosylase inhibitor (UGI) was fused directly to the C-terminus of catalytically dead Cas9 (dCas9) (1). To manipulate cellular DNA mismatch repair systems into preferentially replacing the G in the G:U mismatch with an A, the Ala 840 amino acid in dCas9 was reverted to His, enabling the Cas9 protein to nick the DNA strand opposite the newly formed uracil, resulting in much more efficient conversion of the G:U intermediate to desired A:U and A:T products (1). Combining these two engineering efforts resulted in BE3, a single protein having a three-part fusion of the APOBEC1 cytidine deaminase enzyme tethered through a 16-amino acid linker to S. pyogenes dCas9(A840H), which is covalently linked to UGI through a 4-amino acid linker(1). Subsequent to this report, the scientific community has used BE3 and related base editors for a wide variety of applications including plant genome editing, in vivo mammalian genome editing, targeted mutagenesis, and knockout studies (2-13). The scope of base editing was expanded as described by reporting BE3 variants with altered PAM requirements (4), narrowed editing windows (4), reduced off-target editing (10), and small molecule dependence (21).
The programmable conversion of target C:G base pairs to T:A base pairs without inducing double-stranded DNA breaks or requiring homology-directed repair using engineered fusions of Cas9 variants and cytidine deaminases (1) was recently developed. Over the past year, third-generation base editors (e.g., BE3) and related technologies have been successfully used by many researchers in a wide range of organisms (2-13). At some loci, base editors such as BE3 give rise to undesired byproducts in which the target C:G base pair is converted into a G:C or A:T base pair, rather than the desired T:A product (2, 3, 6-8). Thus, there is a need to generate base editors that have improved performance, for example, base editors that have improved editing efficiency, improved product purity, and/or yield lower indel frequency.
Provided herein are new base editors that convert C:G base pairs to T:A base pairs with greater efficiency, higher product purity, and/or reduced indel frequencies than previously described base editors (e.g., BE3). Some aspects of the disclosure are based on the discovery that base editors fused to a protein that binds to the ends of double strand breaks, for example, the Gam protein of bacteriophage Mu, minimize the formation of undesired indels during base editing, and further increase product purity. Thus, the disclosure provides new base editors comprising proteins (e.g., Gam) that minimize the formation of indels that result from double strand breaks (DSBs).
Determinants of base editing product purity, which establish that UNG activity is required for the formation of undesired byproducts, are described herein. By analyzing individual DNA sequencing reads, it was discovered that blocking UNG access to the uracil intermediate is important for target loci in which a single C is within the editing window in order to minimize undesired products. Using these insights, a fourth-generation base editor, BE4 (e.g., SaBE4), was generated that performs base editing with higher efficiency and greatly improved product purity compared to previously described base editors including BE3. Further, additional base editors (e.g., BE3-Gam and BE4-Gam) were generated, which incorporate the dsDNA end-binding protein Gam to minimize the formation of undesired indels during base editing, and to further increase product purity.
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 “nucleic acid programmable DNA binding protein” or “napDNAbp” refers to a protein that associates with a nucleic acid (e.g., DNA or RNA), such as a guide nucleic acid (e.g., gRNA), that guides the napDNAbp to a specific nucleic acid sequence, for example, by hybridinzing to the target nucleic acid sequence. For example, a Cas9 protein can associate with a guide RNA that guides the Cas9 protein to a specific DNA sequence is has complementary to the guide RNA. In some embodiments, the napDNAbp is a class 2 microbial CRISPR-Cas effector. In some embodiments, the napDNAbp is a Cas9 domain, for example, a nuclease active Cas9, a Cas9 nickase (nCas9), or a nuclease inactive Cas9 (dCas9). Examples of nucleic acid programmable DNA binding proteins include, without limitation, Cas9 (e.g., dCas9 and nCas9), CasX, CasY, Cpf1, C2c1, C2c2, C2C3, and Argonaute. It should be appreciated, however, that nucleic acid programmable DNA binding proteins also include nucleic acid programmable proteins that bind RNA. For example, the napDNAbp may be associated with a nucleic acid that guides the napDNAbp to an RNA. Other nucleic acid programmable DNA binding proteins are also within the scope of this disclosure, though they may not be specifically described in this disclosure.
In some embodiments, the napDNAby is an “RNA-programmable nuclease” or “RNA-guided nuclease.” The terms are used interchangeably herein and refer to a nuclease that forms a complex with (e.g., binds or associates with) one or more RNA(s) 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 also used 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 a single RNA species comprise two domains: (1) a domain that shares homology to a target nucleic acid (i.e., 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. 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 Ser. No. 61/874,682, filed Sep. 6, 2013, entitled “Switchable Cas9 Nucleases And Uses Thereof,” and U.S. Provisional Patent Application 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 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 (Csnl) 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 target, in principle, 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 “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, inactive, or partially active DNA cleavage domain of Cas9, and/or the gRNA binding domain of Cas9). A Cas9 nuclease is also referred to sometimes as a casnl 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 is 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, that is, the Cas9 is a nickase.
A nuclease-inactivated Cas9 protein may interchangeably be referred to as a “dCas9” protein (for nuclease-“dead” Cas9). Methods for generating a Cas9 protein (or a fragment thereof) 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, or a fragment thereof. 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% identical to wild type Cas9. In some embodiments, the Cas9 variant may have 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 21, 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, 50 or more amino acid changes compared 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% identical to the corresponding fragment of wild type Cas9. In some embodiments, the 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.
In some embodiments, the fragment is at least 100 amino acids in length. In some embodiments, the 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, or at least 1300 amino acids in length. 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)).
LLFGSGETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFFHR
MGHKPENIVIEMARENQTTQKGQKNSRERMKRIEEGIKELGSQILKEHPV
ENTQLQNEKLYLYYLQNGRDMYVDQELDINRLSDYDVDHIVPQSFIKDDS
IDNKVLTRSDKNRGKSDNVPSEEVVKKMKNYWRQLLNAKLITQRKFDNLT
KAERGGLSELDKAGFIKRQLVETRQITKHVAQILDSRMNTKYDENDKLIR
EVKVITLKSKLVSDFRKDFQFYKVREINNYHHAHDAYLNAVVGTALIKKY
PKLESEFVYGDYKVYDVRKMIAKSEQEIGKATAKYFFYSNIMNFFKTEIT
LANGEIRKRPLIETNGETGEIVWDKGRDFATVRKVLSMPQVNIVKKTEVQ
TGGFSKESILPKRNSDKLIARKKDWDPKKYGGFDSPTVAYSVLVVAKVEK
In some embodiments, wild type Cas9 corresponds to, or comprises SEQ ID NO:3 (nucleotide) and/or SEQ ID NO: 4 (amino acid):
LLFDSGETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFFHR
MGRHKPENIVIEMARENQTTQKGQKNSRERMKRIEEGIKELGSQILKEHP
VENTQLQNEKLYLYYLQNGRDMYVDQELDINRLSDYDVDHIVPQSFLKDD
SIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNWRQLLNAKLITQRKFDNLT
KAERGGLSELDKAGFIKRQLVETRQITKHVAQILDSRMNTKYDENDKLIR
EVKVITLKSKLVSDFRKDFQFYKVREINNYHHAHDAYLNAVVGTALIKKY
PKLESEFVYGDYKVYDVRKMIAKSEQEIGKATAKYFFYSNIMNFFKTEIT
LANGEIRKRPLIETNGETGEIVWDKGRDFATVRKVLSMPQVNIVKKTEVQ
TGGFSKESILPKRNSDKLIARKKDWDPKKYGGFDSPTVAYSVLVVAKVEK
In some embodiments, wild type Cas9 corresponds to Cas9 from Streptococcus pyogenes (NCBI Reference Sequence: NC_002737.2, SEQ ID NO: 5 (nucleotide); and Uniport Reference Sequence: Q99ZW2, SEQ ID NO: 6 (amino acid).
LLFDSGETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFFHR
MGRHKPENIVIEMARENQTTQKGQKNSRERMKRIEEGIKELGSQILKEHP
VENTQLQNEKLYLYYLQNGRDMYVDQELDINRLSDYDVDHIVPQSFLKDD
SIDNKVLTRSDKNRGKSDNVPSEEVVKKMKNWRQLLNAKLITQRKFDNLT
KAERGGLSELDKAGFIKRQLVETRQITKHVAQILDSRMNTKYDENDKLIR
EVKVITLKSKLVSDFRKDFQFYKVREINNYHHAHDAYLNAVVGTALIKKY
PKLESEFVYGDYKVYDVRKMIAKSEQEIGKATAKYFFYSNIMNFFKTEIT
LANGEIRKRPLIETNGETGEIVWDKGRDFATVRKVLSMPQVNIVKKTEVQ
TGGFSKESILPKRNSDKLIARKKDWDPKKYGGFDSPTVAYSVLVVAKVEK
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 2.
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. dCas9 (D10A and H840A):
ETAEATRLKRTARRRYTRRKNRICYLQEIFSNEMAKVDDSFFHRLEESFLVEEDKKHER
QELDINRLSDYDVDAIVPQSFLKDDSIDNKVLTRSDKNRGKSDNVPSEEVVKK1VIKN
In some embodiments, the Cas9 domain comprises a D10A mutation, while the residue at position 840 remains a histidine in the amino acid sequence provided in SEQ ID NO: 6, or at corresponding positions in any of the amino acid sequences provided in SEQ ID NOs: 11-260. Without wishing to be bound by any particular theory, the presence of the catalytic residue H840 restores the activity of the Cas9 to cleave the non-edited (e.g., non-deaminated) strand containing a G opposite the targeted C. Restoration of H840 (e.g., from A840) does not result in the cleavage of the target strand containing the C. Such Cas9 variants are able to generate a single-strand DNA break (nick) at a specific location based on the gRNA-defined target sequence, leading to repair of the non-edited strand, ultimately resulting in a G to A change on the non-edited strand. Briefly, the C of a C-G basepair can be deaminated to a U by a deaminase, e.g., an APOBEC deamonase. Nicking the non-edited strand, having the G, facilitates removal of the G via mismatch repair mechanisms. UGI inhibits UDG, which prevents removal of the U.
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: 6) 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: 6. In some embodiments, variants of dCas9 (e.g., variants of SEQ ID NO: 6) are provided having amino acid sequences which are shorter, or longer than SEQ ID NO: 6, 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 Cas9 sequences provided herein. 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 sgRNA, but does not comprise a functional nuclease domain, e.g., in that 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 fragments will be apparent to those of skill in the art.
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 cytidine deaminase domain, 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 “Gam protein,” as used herein, refers generally to proteins capable of binding to one or more ends of a double strand break of a double stranded nucleic acid (e.g., double stranded DNA). In some embodiments, the Gam protein prevents or inhibits degradation of one or more strands of a nucleic acid at the site of the double strand break. In some embodiments, a Gam protein is a naturally-occurring Gam protein from bacteriophage Mu, or a non-naturally occurring variant thereof.
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 nucleic acid editing 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 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 “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 Cas9 domain (e.g., a Cas9 nickase) and a nucleic acid editing 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 a catalytic domain of a nucleic-acid editing domain (e.g., a deaminase domain). In some embodiments, a linker joins a Cas9 domain (e.g., a Cas9 nickase) and a Gam 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, an 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).
The term “nucleic acid editing domain,” as used herein refers to a protein or enzyme capable of making one or more modifications (e.g., deamination of a cytidine residue) to a nucleic acid (e.g., DNA or RNA). Exemplary nucleic acid editing domains include, but are not limited to a deaminase, a nuclease, a nickase, a recombinase, a methyltransferase, a methylase, an acetylase, an acetyltransferase, a transcriptional activator, or a transcriptional repressor domain. In some embodiments the nucleic acid editing domain is a deaminase (e.g., a cytidine deaminase, such as an APOBEC or an AID deaminase).
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 neoplasms. 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 “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 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 Gam-nCas9-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 “pharmaceutical composition,” as used herein, refers to a composition that can be administrated to a subject in the context of treatment of a disease or disorder. In some embodiments, a pharmaceutical composition comprises an active ingredient, e.g., a nuclease or a nucleic acid encoding a nuclease, and a pharmaceutically acceptable excipient.
The term “base editor (BE),” or “nucleobase editor (NBE),” as used herein, refers to an agent comprising a polypeptide that is capable of making a modification to a base (e.g., A, T, C, G, or U) within a nucleic acid sequence (e.g., DNA or RNA). In some embodiments, the base editor is capable of deaminating a base within a nucleic acid. In some embodiments, the base editor is capable of deaminating a base within a DNA molecule. In some embodiments, the base editor is capable of deaminating a cytosine (C) in DNA. In some embodiments, the base editor is a fusion protein comprising a Gam protein, a nucleic acid programmable DNA binding protein (napDNAbp), and a cytidine deaminase domain. In some embodiments, the base editor comprises a Cas9 (e.g., dCas9 and nCas9), CasX, CasY, Cpf1, C2c1, C2c2, C2c3, or Argonaute protein fused to a cytidine deaminase. In some embodiments, the base editor comprises a Cas9 nickase (nCas9) fused to a cytidine deaminase. In some embodiments, the base editor comprises a nuclease-inactive Cas9 (dCas9) fused to a cytidine deaminase. In some embodiments, the base editor is fused to a protein that binds to one or more ends of a double strand break in a double stranded nucleic acid (e.g., DNA or RNA). In some embodiments, the base editor is fused to an inhibitor of base excision repair, for example, a UGI domain. In some embodiments, the base editor comprises a Gam protein, fused to a CasX protein, which is fused to a cytidine deaminase. In some embodiments, the base editor comprises a Gam protein, fused to a CasY protein, which is fused to a cytidine deaminase. In some embodiments, the base editor comprises a Gam protein, fused to a Cpf1 protein, which is fused to a cytidine deaminase. In some embodiments, the base editor comprises a Gam protein, fused to a C2c1 protein, which is fused to a cytidine deaminase. In some embodiments, the base editor comprises a Gam protein, fused to a C2c2 protein, which is fused to a cytidine deaminase. In some embodiments, the base editor comprises a Gam protein, fused to a C2c3 protein, which is fused to a cytidine deaminase. In some embodiments, the base editor comprises a Gam protein, fused to an Argonaute protein, which is fused to a cytidine deaminase.
The term “uracil glycosylase inhibitor” or “UGI,” as used herein, refers to a protein that is capable of inhibiting a uracil-DNA glycosylase base-excision repair enzyme.
The term “Cas9 nickase,” as used herein, refers to a Cas9 protein that is capable of cleaving only one strand of a duplexed nucleic acid molecule (e.g., a duplexed DNA molecule). In some embodiments, a Cas9 nickase comprises a D10A mutation and has a histidine at position H840 of SEQ ID NO: 6, or a corresponding mutation in any of SEQ ID NOs: 11-260. For example, a Cas9 nickase may comprise the amino acid sequence as set forth in SEQ ID NO: 8. Such a Cas9 nickase has an active HNH nuclease domain and is able to cleave the non-targeted strand of DNA, i.e., the strand bound by the gRNA. Further, such a Cas9 nickase has an inactive RuvC nuclease domain and is not able to cleave the targeted strand of the DNA, i.e., the strand where base editing is desired.
Exemplary Cas9 nickase (Cloning vector pPlatTET-gRNA2; Accession No. BAV54124).
Some aspects of this disclosure provide fusion proteins that comprise a domain capable of binding to one or more ends of a double strand break of a nucleic acid (e.g., a Gam protein); a domain capable of binding to a nucleotide sequence (e.g., a Cas9, or a Cpf1 protein) and an enzyme 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 respective residue, which constitutes nucleic acid editing. Fusion proteins comprising a Gam protein, or variant thereof, a napDNAbp domain, or variant thereof, and a DNA editing domain, or variant thereof, 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. Such fusion proteins are useful for targeted editing of DNA that generate fewer indels (e.g., <0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.5%, or 1% indels) than other base editors (e.g., BE3 or BE4). Typically, the Cas9 domain of the fusion proteins described herein does not have full nuclease activity but instead is a Cas9 nickase, a Cas9 fragment, or a nuclease-inactive Cas9 domain (dCas9). Methods for the use of Cas9 fusion proteins as described herein are also provided.
Some aspects of the disclosure are based on the discovery that fusing BE3 or BE4 to Gam, a bacteriophage Mu protein that binds double-stranded DNA breaks, greatly reduces indel formation during base editing, in most cases to below 0.5%. BE4 and BE4-Gam represent the state-of-the-art in C:G to T:A base editing.
Fusion Proteins Comprising Gam
Some aspects of the disclosure provide fusion proteins comprising a Gam protein. Some aspects of the disclosure provide base editors that further comprise a Gam protein. Base editors are known in the art and have been described previously, for example, in U.S. Patent Application Publication Nos.: US-2015-0166980, published Jun. 18, 2015; US-2015-0166981, published Jun. 18, 2015; US-2015-0166984, published Jun. 18, 2015; US-2015-01669851, published Jun. 18, 2015; US-2016-0304846, published Oct. 20, 2016; US-2017-0121693-A1, published May 4, 2017; and PCT Application publication Nos.: WO2015089406, published Jun. 18, 2015; and WO2017070632, published Apr. 27, 2017; the entire contents of each of which are hereby incorporated by reference. A skilled artisan would understand, based on the disclosure, how to make and use base editors that further comprise a Gam protein.
In some embodiments, the disclosure provides fusion proteins comprising a nucleic acid programmable DNA binding protein (napDNAbp) and a Gam protein. In some embodiments, the disclosure provides fusion proteins comprising a cytidine deaminase domain and a Gam protein. In some embodiments, the disclosure provides fusion proteins comprising a UGI domain and a Gam protein. In some embodiments, the disclosure provides fusion proteins comprising a nucleic acid programmable DNA binding protein (napDNAbp), a cytidine deaminase domain and a Gam protein. In some embodiments, the disclosure provides fusion proteins comprising a nucleic acid programmable DNA binding protein (napDNAbp), a cytidine deaminase domain a Gam protein and a UGI domain.
In some embodiments, the Gam protein is a protein that binds to double strand breaks in DNA and prevents or inhibits degradation of the DNA at the double strand breaks. In some embodiments, the Gam protein is encoded by the bacteriophage Mu, which binds to double stranded breaks in DNA. Without wishing to be bound by any particular theory, Mu transposes itself between bacterial genomes and uses Gam to protect double stranded breaks in the transposition process. Gam can be used to block homologous recombination with sister chromosomes to repair double strand breaks, sometimes leading to cell death. The survival of cells exposed to UV is similar for cells expression Gam and cells where the recB is mutated. This indicates that Gam blocks DNA repair (Cox, 2013). The Gam protein can thus promote Cas9-mediated killing (Cui et al., 2016). GamGFP is used to label double stranded breaks, although this can be difficult in eukaryotic cells as the Gam protein competes with similar eukaryotic protein Ku (Shee et al., 2013).
Gam is related to Ku70 and Ku80, two eukaryotic proteins involved in non-homologous DNA end-joining (Cui et al., 2016). Gam has sequence homology with both subunits of Ku (Ku70 and Ku80), and can have a similar structure to the core DNA-binding region of Ku. Orthologs to Mu Gam are present in the bacterial genomes of Haemophilus influenzae, Salmonella typhi, Neisseria meningitidis and the enterohemorrhagic O157:H7 strain of E. coli (d'Adda di Fagagna et al., 2003). Gam proteins have been described previously, for example, in COX, Proteins pinpoint double strand breaks. eLife. 2013; 2: e01561.; CUI et al., Consequences of Cas9 cleavage in the chromosome of Escherichia coli. Nucleic Acids Res. 2016 May 19; 44(9):4243-51. doi: 10.1093/nar/gkw223. Epub 2016 Apr. 8.; D′ADDA DI FAGAGNA et al., The Gam protein of bacteriophage Mu is an orthologue of eukaryotic Ku. EMBO Rep. 2003 January; 4(1):47-52.; and SHEE et al., Engineered proteins detect spontaneous DNA breakage in human and bacterial cells. Elife. 2013 Oct. 29; 2:e01222. doi: 10.7554/eLife.01222; the contents of each of which are incorporated herein by reference.
In some embodiments, the Gam protein is a protein that binds double strand breaks in DNA and prevents or inhibits degradation of the DNA at the double strand breaks. In some embodiments, the Gam protein is a naturally occurring Gam protein from any organism (e.g., a bacterium), for example, any of the organisms provided herein. In some embodiments, the Gam protein is a variant of a naturally-occurring Gam protein from an organism. In some embodiments, the Gam protein does not occur in nature. In some embodiments, the Gam protein 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 Gam protein. In some embodiments, the Gam protein 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 any of the Gam proteins provided herein (e.g., SEQ ID NO: 9). Exemplary Gam proteins are provided below. In some embodiments, the Gam protein comprises any of the Gam proteins provided herein (e.g., SEQ ID NO: 9). In some embodiments, the Gam protein is a truncated version of any of the Gam proteins provided herein. In some embodiments, the truncated Gam protein is missing 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 6, 17, 18, 19, or 20 N-terminal amino acid residues relative to a full-length Gam protein. In some embodiments, the truncated Gam protein may be missing 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 6, 17, 18, 19, or 20 C-terminal amino acid residues relative to a full-length Gam protein. In some embodiments, the Gam protein does not comprise an N-terminal methionine.
In some embodiments, the Gam protein comprises an amino acid sequence that is at least 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95, 98%, 99%, or 99.5% identical to any of the Gam proteins provided herein. In some embodiments, the Gam protein comprises an amino acid sequence that has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 21, 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, 50 or more mutations compared to any one of the Gam Proteins provided herein. In some embodiments, the Gam protein comprises an amino acid sequence that has 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, at least 100, at least 110, at least 120, at least 130, at least 140, at least 150, at least 160, or at least 170, identical contiguous amino acid residues as compared to any of the Gam proteins provided herein. In some embodiments, the Gam protein comprises the amino acid sequence of any of the Gam proteins provided herein. In some embodiments, the Gam protein comprises the amino acid sequence of SEQ ID NO: 9. In some embodiments, the Gam protein consists of the any of the Gam proteins provided herein (e.g., SEQ ID NO: 9). In some embodiments, the Gam protein comprises the amino acid sequence of SEQ ID NO: 10 (i.e., contains an N-terminal methionine residue). In some embodiments, the Gam protein comprises the amino acid sequence of any one of SEQ ID NOs: 261-283.
>WP_001107937.1 MULTISPECIES: host-nuclease inhibitor protein Gam [Enterobacteriaceae]>EJL11163.1 bacteriophage Mu Gam like family protein [Shigella sonnei str. Moseley]>CSO81529.1 host-nuclease inhibitor protein [Shigella sonnei]>OCE38605.1 host-nuclease inhibitor protein Gam [Shigella sonnei]>SJK50067.1 host-nuclease inhibitor protein [Shigella sonnei]>SJK19110.1 host-nuclease inhibitor protein [Shigella sonnei]>SIY81859.1 host-nuclease inhibitor protein [Shigella sonnei]>S1134359.1 host-nuclease inhibitor protein [Shigella sonnei]>SJK07688.1 host-nuclease inhibitor protein [Shigella sonnei]>SJI95156.1 host-nuclease inhibitor protein [Shigella sonnei]>SIY86865.1 host-nuclease inhibitor protein [Shigella sonnei]>S1167303.1 host-nuclease inhibitor protein [Shigella sonnei]>SJJ18596.1 host-nuclease inhibitor protein [Shigella sonnei]>SIX52979.1 host-nuclease inhibitor protein [Shigella sonnei]>SJDO5143.1 host-nuclease inhibitor protein [Shigella sonnei]>SJD37118.1 host-nuclease inhibitor protein [Shigella sonnei]>SJE51616.1 host-nuclease inhibitor protein [Shigella sonnei]
>WP_001107936.1 MULTISPECIES: host-nuclease inhibitor protein Gam [Enterobacteriaceae]>EGI94970.1 host-nuclease inhibitor protein gam [Shigella boydii 5216-82]>CSR34065.1 host-nuclease inhibitor protein [Shigella sonnei]>CSQ65903.1 host-nuclease inhibitor protein [Shigella sonnei]>CSQ94361.1 host-nuclease inhibitor protein [Shigella sonnei]>SJK23465.1 host-nuclease inhibitor protein [Shigella sonnei]>SJB59111.1 host-nuclease inhibitor protein [Shigella sonnei]>SJI55768.1 host-nuclease inhibitor protein [Shigella sonnei]>SJI56601.1 host-nuclease inhibitor protein [Shigella sonnei]>SJJ20109.1 host-nuclease inhibitor protein [Shigella sonnei]>SJJ54643.1 host-nuclease inhibitor protein [Shigella sonnei]>SJI29650.1 host-nuclease inhibitor protein [Shigella sonnei]>SIZ53226.1 host-nuclease inhibitor protein [Shigella sonnei]>SJA65714.1 host-nuclease inhibitor protein [Shigella sonnei]>SJJ21793.1 host-nuclease inhibitor protein [Shigella sonnei]>SJD61405.1 host-nuclease inhibitor protein [Shigella sonnei]>SJJ14326.1 host-nuclease inhibitor protein [Shigella sonnei]>SIZ57861.1 host-nuclease inhibitor protein [Shigella sonnei]>SJD58744.1 host-nuclease inhibitor protein [Shigella sonnei]>SJD84738.1 host-nuclease inhibitor protein [Shigella sonnei]>SJJ51125.1 host-nuclease inhibitor protein [Shigella sonnei]>SJDO1353.1 host-nuclease inhibitor protein [Shigella sonnei]>SJE63176.1 host-nuclease inhibitor protein [Shigella sonnei]
>WP_065226797.1 host-nuclease inhibitor protein Gam [Escherichia coli]>AN088858.1 host-nuclease inhibitor protein Gam [Escherichia coli]>AN089006.1 host-nuclease inhibitor protein Gam [Escherichia coli]
Nucleic Acid Programmable DNA Binding Proteins
Some aspects of the disclosure provide nucleic acid programmable DNA binding proteins, which may be used to guide a protein, such as a base editor, to a specific nucleic acid (e.g., DNA or RNA) sequence. It should be appreciated that any of the fusion proteins (e.g., base editors) provided herein may include any nucleic acid programmable DNA binding protein (napDNAbp). For example, any of the fusion proteins described herein that include a Cas9 domain, can use another napDNAbp, such as CasX, CasY, Cpf1, C2c1, C2c2, C2c3, and Argonaute, in place of the Cas9 domain. Nucleic acid programmable DNA binding proteins include, without limitation, Cas9 (e.g., dCas9 and nCas9), CasX, CasY, Cpf1, C2c1, C2c2, C2C3, and Argonaute. One example of a nucleic acid programmable DNA-binding protein that has a different PAM specificity than Cas9 is Clustered Regularly Interspaced Short Palindromic Repeats from Prevotella and Francisella 1 (Cpf1). Similar to Cas9, Cpf1 is also a class 2 CRISPR effector. It has been shown that Cpflmediates robust DNA interference with features distinct from Cas9. Cpf1 is a single RNA-guided endonuclease lacking tracrRNA, and it utilizes a T-rich protospacer-adjacent motif (TTN, TTTN (SEQ ID NO: 284), or YTN). Moreover, Cpf1 cleaves DNA via a staggered DNA double-stranded break. Out of 16 Cpf1-family proteins, two enzymes from Acidaminococcus and Lachnospiraceae are shown to have efficient genome-editing activity in human cells. Cpf1 proteins are known in the art and have been described previously, for example, Yamano et al., “Crystal structure of Cpf1 in complex with guide RNA and target DNA.” Cell (165) 2016, p. 949-962; the entire contents of which are incorporated herein by reference.
Also useful in the present compositions and methods are nuclease-inactive Cpf1 (dCpf1) variants that may be used as a guide nucleotide sequence-programmable DNA-binding protein domain. The Cpf1 protein has a RuvC-like endonuclease domain that is similar to the RuvC domain of Cas9 but does not have a HNH endonuclease domain, and the N-terminal of Cpf1 does not have the alpha-helical recognition lobe of Cas9. It was shown in Zetsche et al., Cell, 163, 759-771, 2015 (which is incorporated herein by reference) that, the RuvC-like domain of Cpf1 is responsible for cleaving both DNA strands and inactivation of the RuvC-like domain inactivates Cpf1 nuclease activity. For example, mutations corresponding to D917A, E1006A, or D1255A in Francisella novicida Cpf1 (SEQ ID NO: 753) inactivate Cpf1 nuclease activity. In some embodiments, the dead Cpf1 (dCpf1) comprises mutations corresponding to D917A, E1006A, D1255A, D917A/E1006A, D917A/D1255A, E1006A/D1255A, or D917A/E1006A/D1255A in SEQ ID NO: 285. It is to be understood that any mutations, e.g., substitution mutations, deletions, or insertions, that inactivate the RuvC domain of Cpf1, may be used in accordance with the present disclosure.
In some embodiments, the nucleic acid programmable DNA binding protein (napDNAbp) of any of the fusion proteins provided herein is a Cpf1 protein. In some embodiments, the Cpf1 protein is a Cpf1 nickase (nCpf1). In some embodiments, the Cpf1 protein is a nuclease inactive Cpf1 (dCpf1). In some embodiments, the Cpf1, the nCpf1, or the dCpf1 comprises an amino acid sequence that is at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, 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: 285-292 or 293-303. In some embodiments, the dCpf1 comprises an amino acid sequence that is at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, 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: 285-292, and comprises mutations corresponding to D917A, E1006A, D1255A, D917A/E1006A, D917A/D1255A, E1006A/D1255A, or D917A/E1006A/D1255A in SEQ ID NO: 376. In some embodiments, the dCpf1 protein comprises an amino acid sequence of any one SEQ ID NOs: 285-292. It should be appreciated that Cpf1 from other species may also be used in accordance with the present disclosure.
D
ANGAYHIGLKGLMLLGRIKNNQEGKKLNLVIKNEEYFEFVQNRNN
Francisella novicida Cpf1 D917A (SEQ ID NO: 286)(A917, E1006, and D1255 are bolded and
D
ANGAYHIGLKGLMLLGRIKNNQEGKKLNLVIKNEEYFEFVQNRNN
Francisella novicida Cpf1 E1006A (SEQ ID NO: 287)(D917, A1006, and D1255 are bolded
D
ANGAYHIGLKGLMLLGRIKNNQEGKKLNLVIKNEEYFEFVQNRNN
Francisella novicida Cpf1 D1255A (SEQ ID NO: 288)(D917, E1006, and A1255 are bolded
A
ANGAYHIGLKGLMLLGRIKNNQEGKKLNLVIKNEEYFEFVQNRNN
Francisella novicida Cpf1 D917A/E1006A (SEQ ID NO: 289)(A917, A1006, and D1255 are
D
ANGAYHIGLKGLMLLGRIKNNQEGKKLNLVIKNEEYFEFVQNRNN
Francisella novicida Cpf1 D917A/D1255A (SEQ ID NO: 290)(A917, E1006, and A1255 are
A
ANGAYHIGLKGLMLLGRIKNNQEGKKLNLVIKNEEYFEFVQNRNN
Francisella novicida Cpf1 E1006A/D1255A (SEQ ID NO: 291)(D917, A1006, and A1255 are
A
ANGAYHIGLKGLMLLGRIKNNQEGKKLNLVIKNEEYFEFVQNRNN
Francisella novicida Cpf1 D917A/E1006A/D1255A (SEQ ID NO: 292)(A917, A1006, and
A
ANGAYHIGLKGLMLLGRIKNNQEGKKLNLVIKNEEYFEFVQNRNN
In some embodiments, the nucleic acid programmable DNA binding protein is a Cpf1 protein from an Acidaminococcus species (AsCpf1). Cpf1 proteins form Acidaminococcus species have been described previously and would be apparent to the skilled artisan. Exemplary Acidaminococcus Cpf1 proteins (AsCpf1) include, without limitation, any of the AsCpf1 proteins provided herein
In some embodiments, the nucleic acid programmable DNA binding protein is a Cpf1 protein from a Lachnospiraceae species (LbCpf1). Cpf1 proteins form Lachnospiraceae species have been described previously have been described previously and would be apparent to the skilled artisan. Exemplary Lachnospiraceae Cpf1 proteins (LbCpf1) include, without limitation, any of the LbCpf1 proteins provided herein.
In some embodiments, the Cpf1 protein is a crippled Cpf1 protein. As used herein a “crippled Cpf1” protein is a Cpf1 protein having diminished nuclease activity as compared to a wild-type Cpf1 protein. In some embodiments, the crippled Cpf1 protein preferentially cuts the target strand more efficiently than the non-target strand. For example, the Cpf1 protein preferentially cuts the strand of a duplexed nucleic acid molecule in which a nucleotide to be edited resides. In some embodiments, the crippled Cpf1 protein preferentially cuts the non-target strand more efficiently than the target strand. For example, the Cpf1 protein preferentially cuts the strand of a duplexed nucleic acid molecule in which a nucleotide to be edited does not reside. In some embodiments, the crippled Cpf1 protein preferentially cuts the target strand at least 5% more efficiently than it cuts the non-target strand. In some embodiments, the crippled Cpf1 protein preferentially cuts the target strand at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80%, 90%, or at least 100% more efficiently than it cuts the non-target strand.
In some embodiments, a crippled Cpf1 protein is a non-naturally occurring Cpf1 protein. In some embodiments, the crippled Cpf1 protein comprises one or more mutations relative to a wild-type Cpf1 protein. In some embodiments, the crippled Cpf1 protein comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 mutations relative to a wild-type Cpf1 protein. In some embodiments, the crippled Cpf1 protein comprises an R836A mutation mutation as set forth in SEQ ID NO: 295, or in a corresponding amino acid in another Cpf1 protein. It should be appreciated that a Cpf1 comprising a homologous residue (e.g., a corresponding amino acid) to R836A of SEQ ID NO: 295 could also be mutated to achieve similar results. In some embodiments, the crippled Cpf1 protein comprises a R1138A mutation as set forth in SEQ ID NO: 295, or in a corresponding amino acid in another Cpf1 protein. In some embodiments, the crippled Cpf1 protein comprises an R912A mutation mutation as set forth in SEQ ID NO: 293, or in a corresponding amino acid in another Cpf1 protein. Without wishing to be bound by any particular theory, residue R838 of SEQ ID NO: 295 (LbCpf1) and residue R912 of SEQ ID NO: 293 (AsCpf1) are examples of corresponding (e.g., homologous) residues. For example, a portion of the alignment between SEQ ID NO: 293 and 295 shows that R912 and R838 are corresponding residues.
In some embodiments, any of the Cpf1 proteins provided herein comprises one or more amino acid deletions. In some embodiments, any of the Cpf1 proteins provided herein comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 amino acid deletions. Without wishing to be bound by any particular theory, there is a helical region in Cpf1, which includes residues 661-667 of AsCpf1 (SEQ ID NO: 293), that may obstruct the function of a deaminase (e.g., APOBEC) that is fused to the Cpf1. This region comprises the amino acid sequence KKTGDQK (SEQ ID NO: 300). Accordingly, aspects of the disclosure provide Cpf1 proteins comprising mutations (e.g., deletions) that disrupt this helical region in Cpf1. In some embodiments, the Cpf1 protein comprises one or more deletions of the following residues in SEQ ID NO: 293, or one or more corresponding deletions in another Cpf1 protein: K661, K662, T663, G664, D665, Q666, and K667. In some embodiments, the Cpf1 protein comprises a T663 and a D665 deletion in SEQ ID NO: 293, or corresponding deletions in another Cpf1 protein. In some embodiments, the Cpf1 protein comprises a K662, T663, D665, and Q666 deletion in SEQ ID NO: 293, or corresponding deletions in another Cpf1 protein. In some embodiments, the Cpf1 protein comprises a K661, K662, T663, D665, Q666 and K667 deletion in SEQ ID NO: 293, or corresponding deletions in another Cpf1 protein.
In some embodiments, the nucleic acid programmable DNA binding protein (napDNAbp) is a nucleic acid programmable DNA binding protein that does not require a canonical (NGG) PAM sequence in the target sequence. In some embodiments, the napDNAbp is an Argonaute protein. One example of such a nucleic acid programmable DNA binding protein is an Argonaute protein from Natronobacterium gregoryi (NgAgo). NgAgo is a ssDNA-guided endonuclease. NgAgo binds 5′-phosphorylated ssDNA of ˜24 nucleotides (gDNA) in length to guide it to a target site and makes DNA double-strand breaks at the gDNA site. In contrast to Cas9, the NgAgo-gDNA system does not require a protospacer-adjacent motif (PAM). Using a nuclease inactive NgAgo (dNgAgo) can greatly expand the bases that may be targeted. The characterization and use of NgAgo have been described in Gao et al., Nat. Biotechnol., 2016 July; 34(7):768-73. PubMed PMID: 27136078; Swarts et al., Nature 507(7491) (2014):258-61; and Swarts et al., Nucleic Acids Res. 43(10) (2015):5120-9, each of which is incorporated herein by reference. The sequence of Natronobacterium gregoryi Argonaute is provided in SEQ ID NO: 304.
In some embodiments, the napDNAbp is an Argonaute protein. In some embodiments, the napDNAbp comprises an amino acid sequence that is at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, 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 Argonaute protein. In some embodiments, the napDNAbp is a naturally-occurring Argonaute protein. In some embodiments, the napDNAbp comprises an amino acid sequence that is at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, 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 NO: 304. In some embodiments, the napDNAbp comprises an amino acid sequence of any one SEQ ID NO: 304.
In some embodiments, the napDNAbp is a prokaryotic homolog of an Argonaute protein. Prokaryotic homologs of Argonaute proteins are known and have been described, for example, in Makarova K., et al., “Prokaryotic homologs of Argonaute proteins are predicted to function as key components of a novel system of defense against mobile genetic elements”, Biol. Direct. 2009 Aug. 25; 4:29. doi: 10.1186/1745-6150-4-29, is incorporated herein by reference. In some embodiments, the napDNAbp is a Marinitoga piezophila Argunaute (MpAgo) protein. The CRISPR-associated Marinitoga piezophila Argonaute (MpAgo) protein cleaves single-stranded target sequences using 5′-phosphorylated guides. The 5′ guides are used by all known Argonautes. The crystal structure of an MpAgo-RNA complex shows a guide strand binding site comprising residues that block 5′ phosphate interactions. This data suggests the evolution of an Argonaute subclass with noncanonical specificity for a 5′-hydroxylated guide. See, e.g., Kaya et al., “A bacterial Argonaute with noncanonical guide RNA specificity”, Proc Natl Acad Sci USA. 2016 Apr. 12; 113(15):4057-62, the entire contents of which are hereby incorporated by reference). It should be appreciated that other Argonaute proteins may be used in any of the fusion proteins (e.g., base editors) described herein, for example, to guide a deaminase (e.g., cytidine deaminase) to a target nucleic acid (e.g., ssRNA).
In some embodiments, the nucleic acid programmable DNA binding protein (napDNAbp) is a single effector of a microbial CRISPR-Cas system. Single effectors of microbial CRISPR-Cas systems include, without limitation, Cas9, Cpf1, C2c1, C2c2, and C2c3. Typically, microbial CRISPR-Cas systems are divided into Class 1 and Class 2 systems. Class 1 systems have multisubunit effector complexes, while Class 2 systems have a single protein effector. Cas9 and Cpf1 are Class 2 effectors. In addition to Cas9 and Cpf1, three distinct Class 2 CRISPR-Cas systems (C2c1, C2c2, and C2c3) have been described by Shmakov et al., “Discovery and Functional Characterization of Diverse Class 2 CRISPR Cas Systems”, Mol. Cell, 2015 Nov. 5; 60(3): 385-397, the entire contents of which are herein incorporated by reference. Effectors of two of the systems, C2c1 and C2c3, contain RuvC-like endonuclease domains related to Cpf1. A third system, C2c2 contains an effector with two predicted HEPN RNase domains. Production of mature CRISPR RNA is tracrRNA-independent, unlike production of CRISPR RNA by C2c1. C2c1 depends on both CRISPR RNA and tracrRNA for DNA cleavage. Bacterial C2c2 has been shown to possess a unique RNase activity for CRISPR RNA maturation distinct from its RNA-activated single-stranded RNA degradation activity. These RNase functions are different from each other and from the CRISPR RNA-processing behavior of Cpf1. See, e.g., East-Seletsky, et al., “Two distinct RNase activities of CRISPR-C2c2 enable guide-RNA processing and RNA detection”, Nature, 2016 Oct. 13; 538(7624):270-273, the entire contents of which are hereby incorporated by reference. In vitro biochemical analysis of C2c2 in Leptotrichia shahii has shown that C2c2 is guided by a single CRISPR RNA and can be programmed to cleave ssRNA targets carrying complementary protospacers. Catalytic residues in the two conserved HEPN domains mediate cleavage. Mutations in the catalytic residues generate catalytically inactive RNA-binding proteins. See e.g., Abudayyeh et al., “C2c2 is a single-component programmable RNA-guided RNA-targeting CRISPR effector,” Science, 2016 Aug. 5; 353(6299), the entire contents of which are hereby incorporated by reference.
The crystal structure of Alicyclobaccillus acidoterrastris C2c1 (AacC2c1) has been reported in complex with a chimeric single-molecule guide RNA (sgRNA). See, e.g., Liu et al., “C2c1-sgRNA Complex Structure Reveals RNA-Guided DNA Cleavage Mechanism”, Mol. Cell, 2017 Jan. 19; 65(2):310-322, incorporated herein by reference. The crystal structure has also been reported for Alicyclobacillus acidoterrestris C2c1 bound to target DNAs as ternary complexes. See, e.g., Yang et al., “PAM-dependent Target DNA Recognition and Cleavage by C2C1 CRISPR-Cas endonuclease”, Cell, 2016 Dec. 15; 167(7):1814-1828, the entire contents of which are hereby incorporated by reference. Catalytically competent conformations of AacC2c1, both with target and non-target DNA strands, have been captured independently positioned within a single RuvC catalytic pocket, with C2c1-mediated cleavage resulting in a staggered seven-nucleotide break of target DNA. Structural comparisons between C2c1 ternary complexes and previously identified Cas9 and Cpf1 counterparts demonstrate the diversity of mechanisms used by CRISPR-Cas9 systems.
In some embodiments, the nucleic acid programmable DNA binding protein (napDNAbp) of any of the fusion proteins provided herein is a C2c1, a C2c2, or a C2c3 protein. In some embodiments, the napDNAbp is a C2c1 protein. In some embodiments, the napDNAbp is a C2c2 protein. In some embodiments, the napDNAbp is a C2c3 protein. In some embodiments, the napDNAbp comprises an amino acid sequence that is at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, 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 C2c1, C2c2, or C2c3 protein. In some embodiments, the napDNAbp is a naturally-occurring C2c1, C2c2, or C2c3 protein. In some embodiments, the napDNAbp comprises an amino acid sequence that is at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, 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: 305-307. In some embodiments, the napDNAbp comprises an amino acid sequence of any one SEQ ID NOs: 305-307. It should be appreciated that C2c1, C2c2, or C2c3 from other bacterial species may also be used in accordance with the present disclosure.
acidoterrestris (strain ATCC49025 / DSM 3922/ CIP 106132 / NCIMB 13137 / GD3B)
In some embodiments, the nucleic acid programmable DNA binding protein (napDNAbp) of any of the fusion proteins provided herein is a Cas9 from archaea (e.g. nanoarchaea), which constitute a domain and kingdom of single-celled prokaryotic microbes. In some embodiments, the napDNAbp is CasX or CasY, which have been described in, for example, Burstein et al., “New CRISPR-Cas systems from uncultivated microbes.” Cell Res. 2017 Feb. 21. doi: 10.1038/cr.2017.21, which is incorporated herein by reference. Using genome-resolved metagenomics, a number of CRISPR-Cas systems were identified, including the first reported Cas9 in the archaeal domain of life. This divergent Cas9 protein was found in nanoarchaea as part of an active CRISPR-Cas system. In bacteria, two previously unknown systems were discovered, CRISPR-CasX and CRISPR-CasY, which are among the most compact systems yet discovered. In some embodiments, Cas9 refers to CasX, or a variant of CasX. In some embodiments, Cas9 refers to a CasY, or a variant of CasY. It should be appreciated that other RNA-guided DNA binding proteins may be used as a nucleic acid programmable DNA binding protein (napDNAbp) and are within the scope of this disclosure.
In some embodiments, the nucleic acid programmable DNA binding protein (napDNAbp) of any of the fusion proteins provided herein is a CasX or CasY protein. In some embodiments, the napDNAbp is a CasX protein. In some embodiments, the napDNAbp is a CasY protein. In some embodiments, the napDNAbp comprises an amino acid sequence that is at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, 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 CasX or CasY protein. In some embodiments, the napDNAbp is a naturally-occurring CasX or CasY protein. In some embodiments, the napDNAbp comprises an amino acid sequence that is at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, 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: 308-310. In some embodiments, the napDNAbp comprises an amino acid sequence of any one SEQ ID NOs: 308-310. It should be appreciated that CasX and CasY from other bacterial species may also be used in accordance with the present disclosure.
Cas9 Domains of Nucleobase Editors
Some aspects of the disclosure provide fusion proteins comprising a Cas9 domain. Non-limiting, exemplary Cas9 domains are provided herein. The Cas9 domain may be a nuclease active Cas9 domain, a nuclease inactive Cas9 domain, or a Cas9 nickase. In some embodiments, the Cas9 domain is a nuclease active domain. For example, the Cas9 domain may be a Cas9 domain that cuts both strands of a duplexed nucleic acid (e.g., both strands of a duplexed DNA molecule). In some embodiments, the Cas9 domain comprises any one of the amino acid sequences as set forth in SEQ ID NOs: 6 or 11-260. In some embodiments the Cas9 domain 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 the amino acid sequences set forth in SEQ ID NOs: 6 or 11-260. In some embodiments, the Cas9 domain comprises an amino acid sequence that has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 21, 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, 50, or more mutations compared to any one of the amino acid sequences set forth in SEQ ID NOs: 6 or 11-260. In some embodiments, the Cas9 domain 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 as compared to any one of the amino acid sequences set forth in SEQ ID NOs: 6 or 11-260.
In some embodiments, the Cas9 domain is a nuclease-inactive Cas9 domain (dCas9). For example, the dCas9 domain may bind to a duplexed nucleic acid molecule (e.g., via a gRNA molecule) without cleaving either strand of the duplexed nucleic acid molecule. In some embodiments, the nuclease-inactive dCas9 domain comprises a D10× mutation and a H840× mutation of the amino acid sequence set forth in SEQ ID NO: 6, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260, wherein X is any amino acid change. In some embodiments, the nuclease-inactive dCas9 domain comprises a D10A mutation and a H840A mutation of the amino acid sequence set forth in SEQ ID NO: 6, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. As one example, a nuclease-inactive Cas9 domain comprises the amino acid sequence set forth in SEQ ID NO: 311 (Cloning vector pPlatTET-gRNA2, Accession No. BAV54124).
Additional suitable nuclease-inactive dCas9 domains will be apparent to those of skill in the art based on this disclosure and knowledge in the field, and are within the scope of this disclosure. Such additional exemplary suitable nuclease-inactive Cas9 domains include, but are not limited to, D10A/H840A, D10A/D839A/H840A, and D10A/D839A/H840A/N863A mutant domains (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). In some embodiments the dCas9 domain 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 the dCas9 domains provided herein. In some embodiments, the Cas9 domain comprises an amino acid sequences that has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 21, 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, 50 or more or more mutations compared to any one of the amino acid sequences set forth in SEQ ID NOs: 6 or 11-260. In some embodiments, the Cas9 domain comprises an amino acid sequence that has at least 10, at least 15, at least 20, at least 30, at leat 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 as compared to any one of the amino acid sequences set forth in SEQ ID NOs: 6 or 11-260.
In some embodiments, the Cas9 domain is a Cas9 nickase. The Cas9 nickase may be a Cas9 protein that is capable of cleaving only one strand of a duplexed nucleic acid molecule (e.g., a duplexed DNA molecule). In some embodiments the Cas9 nickase cleaves the target strand of a duplexed nucleic acid molecule, meaning that the Cas9 nickase cleaves the strand that is base paired to (complementary to) a gRNA (e.g., an sgRNA) that is bound to the Cas9. In some embodiments, a Cas9 nickase comprises a D10A mutation and has a histidine at position 840 of SEQ ID NO: 6, or a mutation in any of SEQ ID NOs: 11-260. For example, a Cas9 nickase may comprise the amino acid sequence as set forth in SEQ ID NO: 674. In some embodiments the Cas9 nickase cleaves the non-target, non-base-edited strand of a duplexed nucleic acid molecule, meaning that the Cas9 nickase cleaves the strand that is not base paired to a gRNA (e.g., an sgRNA) that is bound to the Cas9. In some embodiments, a Cas9 nickase comprises an H840A mutation and has an aspartic acid residue at position 10 of SEQ ID NO: 6, or a corresponding mutation in any of SEQ ID NOs: 11-260. In some embodiments the Cas9 nickase 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 the Cas9 nickases provided herein. Additional suitable Cas9 nickases will be apparent to those of skill in the art based on this disclosure and knowledge in the field, and are within the scope of this disclosure.
Cas9 Domains with Reduced PAM Exclusivity
Some aspects of the disclosure provide Cas9 domains 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 edit desired bases within a genome. In some embodiments, the base editing fusion proteins provided herein may need to be placed at a precise location, for example where a target base is placed within a 4 base region (e.g., a “deamination window”), which is approximately 15 bases upstream of the PAM. See Komor, A. C., et al., “Programmable editing of a target base in genomic DNA without double-stranded DNA cleavage” Nature 533, 420-424 (2016), the entire contents of which are hereby incorporated by reference. Accordingly, in some embodiments, any of the fusion proteins provided herein may contain a Cas9 domain that is capable of binding a nucleotide sequence that does not contain a canonical (e.g., NGG) PAM sequence. Cas9 domains that bind to non-canonical PAM sequences have been described in the art and would be apparent to the skilled artisan. For example, Cas9 domains 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 domain is a Cas9 domain from Staphylococcus aureus (SaCas9). In some embodiments, the SaCas9 domain 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: 313. In some embodiments, the SaCas9 comprises a N579X mutation of SEQ ID NO: 313, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260, wherein X is any amino acid except for N. In some embodiments, the SaCas9 comprises a N579A mutation of SEQ ID NO: 313, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the SaCas9 domain, the SaCas9d domain, or the SaCas9n domain can bind to a nucleic acid sequence having a non-canonical PAM. In some embodiments, the SaCas9 domain, the SaCas9d domain, or the SaCas9n domain can bind to a nucleic acid sequence having a NNGRRT (SEQ ID NO: 312) PAM sequence. In some embodiments, the SaCas9 domain comprises one or more of a E781X, a N967X, and a R1014X mutation of SEQ ID NO: 313, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260, wherein X is any amino acid. In some embodiments, the SaCas9 domain comprises one or more of a E781K, a N967K, and a R1014H mutation of SEQ ID NO: 313, or one or more corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the SaCas9 domain comprises a E781K, a N967K, or a R1014H mutation of SEQ ID NO: 313, or corresponding mutations in any of the amino acid sequences provided in SEQ ID NOs: 11-260.
In some embodiments, the Cas9 domain 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: 313-315. 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: 313-315. 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: 313-315.
H
IIKTIASKTQSIKKYSTDILGNLYEVKSKKHPQIIKKG.
In some embodiments, the Cas9 domain is a Cas9 domain from Streptococcus pyogenes (SpCas9). In some embodiments, the SpCas9 domain 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: 316. In some embodiments, the SpCas9 comprises a D9X mutation of SEQ ID NO: 316, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260, wherein X is any amino acid except for D. In some embodiments, the SpCas9 comprises a D9A mutation of SEQ ID NO: 316, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the SpCas9 domain, the SpCas9d domain, or the SpCas9n domain can bind to a nucleic acid sequence having a non-canonical PAM. In some embodiments, the SpCas9 domain, the SpCas9d domain, or the SpCas9n domain can bind to a nucleic acid sequence having a NGG, a NGA, or a NGCG PAM sequence. In some embodiments, the SpCas9 domain comprises one or more of a D1134X, a R1334X, and a T1336X mutation of SEQ ID NO: 316, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260, wherein X is any amino acid. In some embodiments, the SpCas9 domain comprises one or more of a D1134E, R1334Q, and T1336R mutation of SEQ ID NO: 316, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the SpCas9 domain comprises a D1134E, a R1334Q, and a T1336R mutation of SEQ ID NO: 316, or corresponding mutations in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the SpCas9 domain comprises one or more of a D1134X, a R1334X, and a T1336X mutation of SEQ ID NO: 316, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260, wherein X is any amino acid. In some embodiments, the SpCas9 domain comprises one or more of a D1134V, a R1334Q, and a T1336R mutation of SEQ ID NO: 316, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the SpCas9 domain comprises a D1134V, a R1334Q, and a T1336R mutation of SEQ ID NO: 316, or corresponding mutations in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the SpCas9 domain comprises one or more of a D1134X, a G1217X, a R1334X, and a T1336X mutation of SEQ ID NO: 316, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260, wherein X is any amino acid. In some embodiments, the SpCas9 domain comprises one or more of a D1134V, a G1217R, a R1334Q, and a T1336R mutation of SEQ ID NO: 316, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the SpCas9 domain comprises a D1134V, a G1217R, a R1334Q, and a T1336R mutation of SEQ ID NO: 316, or corresponding mutations in any of the amino acid sequences provided in SEQ ID NOs: 11-260.
In some embodiments, the Cas9 domain 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: 316-320. 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: 316-320. 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: 316-320.
High Fidelity Base Editors
Some aspects of the disclosure provide Cas9 fusion proteins (e.g., any of the fusion proteins provided herein) comprising a Cas9 domain that has high fidelity. Additional aspects of the disclosure provide Cas9 fusion proteins (e.g., any of the fusion proteins provided herein) comprising a Cas9 domain with decreased electrostatic interactions between the Cas9 domain and a sugar-phosphate backbone of a DNA, as compared to a wild-type Cas9 domain. In some embodiments, a Cas9 domain (e.g., a wild type Cas9 domain) comprises one or more mutations that decreases the association between the Cas9 domain and a sugar-phosphate backbone of a DNA. In some embodiments, any of the Cas9 fusion 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: 6, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260, wherein X is any amino acid. In some embodiments, any of the Cas9 fusion 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: 10, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the Cas9 domain comprises a D10A mutation of the amino acid sequence provided in SEQ ID NO: 6, or a corresponding mutation in any of the amino acid sequences provided in SEQ ID NOs: 11-260. In some embodiments, the Cas9 domain (e.g., of any of the fusion proteins provided herein) comprises the amino acid sequence as set forth in SEQ ID NO: 321. In some embodiments, the fusion protein comprises the amino acid sequence as set forth in SEQ ID NO: 322. Cas9 domains with high fidelity are known in the art and would be apparent to the skilled artisan. For example, Cas9 domains with high fidelity 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 the base editors provided herein, for example, base editor 2 (BE2) or base editor 3 (BE3), may be converted into high fidelity base editors by modifying the Cas9 domain as described herein to generate high fidelity base editors, for example, high fidelity base editor 2 (HF-BE2) or high fidelity base editor 3 (HF-BE3). In some embodiments, base editor 2 (BE2) comprises a deaminase domain, a dCas9, and a UGI domain. In some embodiments, base editor 3 (BE3) comprises a deaminase domain, anCas9 domain and a UGI domain.
Deaminase Domains of the Fusion Proteins
Some aspects of the disclosure provide fusion proteins comprising one or more nucleic acid editing domains (e.g., deaminase domains). In some embodiments, the nucleic acid editing domain can catalyze a C to U base change. In some embodiments, the nucleic acid editing domain is a deaminase domain. In some embodiments, the deaminase is a cytidine 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 APOBEC3B deaminase. In some embodiments, the deaminase is an APOBEC3C 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 deaminase is a vertebrate deaminase. In some embodiments, the deaminase is an invertebrate deaminase. In some embodiments, the deaminase is a human, chimpanzee, gorilla, monkey, cow, dog, rat, or mouse deaminase. In some embodiments, the deaminase is a human deaminase. In some embodiments, the deaminase is a rat deaminase, e.g., rAPOBEC1. In some embodiments, the deaminase is a Petromyzon marinus cytidine deaminase 1 (pmCDA1). In some embodiments, the deaminase is a human APOBEC3G (SEQ ID NO: 333). In some embodiments, the deaminase is a fragment of the human APOBEC3G (SEQ ID NO: 356). In some embodiments, the deaminase is a human APOBEC3G variant comprising a D316R_D317R mutation (SEQ ID NO: 355). In some embodiments, the deaminase is a fragment of the human APOBEC3G and comprising mutations corresponding to the D316R_D317R mutations in SEQ ID NO: 333 (SEQ ID NO: 357).
In some embodiments, the nucleic acid editing 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 any of the deaminase domains provided herein. In some embodiments, the nucleic acid editing 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: 323-361. In some embodiments, the nucleic acid editing domain comprises the amino acid sequence of any one of SEQ ID NOs: 323-361.
Deaminase Domains that Modulate the Editing Window of Base Editors
Some aspects of the disclosure are based on the recognition that modulating the deaminase domain catalytic activity of any of the fusion proteins provided herein, for example by making point mutations in the deaminase domain, affect the processivity of the fusion proteins (e.g., base editors). For example, mutations that reduce, but do not eliminate, the catalytic activity of a deaminase domain within a base editing fusion protein can make it less likely that the deaminase domain will catalyze the deamination of a residue adjacent to a target residue, thereby narrowing the deamination window. The ability to narrow the deamination window may prevent unwanted deamination of residues adjacent of specific target residues, which may decrease or prevent off-target effects.
In some embodiments, any of the fusion proteins provided herein comprises a deaminase domain (e.g., a cytidine deaminase domain) that has reduced catalytic deaminase activity. In some embodiments, any of the fusion proteins provided herein comprises a deaminase domain (e.g., a cytidine deaminase domain) that has a reduced catalytic deaminase activity as compared to an appropriate control. For example, the appropriate control may be the deaminase activity of the deaminase prior to introducing one or more mutations into the deaminase. In other embodiments, the appropriate control may be a wild-type deaminase. In some embodiments, the appropriate control is a wild-type apolipoprotein B mRNA-editing complex (APOBEC) family deaminase. In some embodiments, the appropriate control is an APOBEC1 deaminase, an APOBEC2 deaminase, an APOBEC3A deaminase, an APOBEC3B deaminase, an APOBEC3C deaminase, an APOBEC3D deaminase, an APOBEC3F deaminase, an APOBEC3G deaminase, or an APOBEC3H deaminase. In some embodiments, the appropriate control is an activation induced deaminase (AID). In some embodiments, the appropriate control is a cytidine deaminase 1 from Petromyzon marinus (pmCDA1). In some embodiments, the deaminase domain may be a deaminase domain that has at least 1%, at least 5%, at least 15%, at least 20%, at least 25%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, or at least 95% less catalytic deaminase activity as compared to an appropriate control.
In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising one or more mutations selected from the group consisting of H121X, H122X, R126X, R126X, R118X, W90X, W90X, and R132X of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase, wherein X is any amino acid. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising one or more mutations selected from the group consisting of H121R, H122R, R126A, R126E, R118A, W90A, W90Y, and R132E of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase.
In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising one or more mutations selected from the group consisting of D316X, D317X, R320X, R320X, R313X, W285X, W285X, R326X of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase, wherein X is any amino acid. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising one or more mutations selected from the group consisting of D316R, D317R, R320A, R320E, R313A, W285A, W285Y, R326E of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase.
In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a H121R and a H122R mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R126A mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R126E mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R118A mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W90A mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W90Y mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R132E mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W90Y and a R126E mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R126E and a R132E mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W90Y and a R132E mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W90Y, R126E, and R132E mutation of rAPOBEC1 (SEQ ID NO: 349), or one or more corresponding mutations in another APOBEC deaminase.
In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a D316R and a D317R mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R320A mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R320E mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R313A mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W285A mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W285Y mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R326E mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W285Y and a R320E mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a R320E and a R326E mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W285Y and a R326E mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase. In some embodiments, any of the fusion proteins provided herein comprise an APOBEC deaminase comprising a W285Y, R320E, and R326E mutation of hAPOBEC3G (SEQ ID NO: 333), or one or more corresponding mutations in another APOBEC deaminase.
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. It should 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 localization sequence, without nuclear export signal, cytoplasmic localizing signal).
MDSLLMNRRKFLYQFKNVRWAKGRRETYLCYVVKRRDSATSFSLDFGYLRNKNGCH
MDSLLMKQKKFLYHFKNVRWAKGRHETYLCYVVKRRDSATSCSLDFGHLRNKSGCH
MDSLLMKQRKFLYHFKNVRWAKGRHETYLCYVVKRRDSATSFSLDFGHLRNKSGCHV
MDSLLKKQRQFLYQFKNVRWAKGRHETYLCYVVKRRDSPTSFSLDFGHLRNKAGCHV
MAVGSKPKAALVGPHWERERIWCFLCSTGLGTQQTGQTSRWLRPAATQDPVSPPRSLL
DAFRTLGL
RSMELSQVTITCYLTWSPCPNCAWQLAAFKRDRPDLILHIYTSRLYFHWKRPFQKGLCSL
SMELSQVIITCYLTWSPCPNCAWQLAAFKRDRPDLILHIYTSRLYFHWKRPFQKGLCSLW
MVEPMDPRTFVSNFNNRPILSGLNTVWLCCEVKTKDPSGPPLDAKIFQGKVYSKAKYH
PEM
RFLRWFHKWRQLHHDQEYKVTWYVSWSPCTRCANSVATFLAKDPKVTLTIFVARLY
MKPHFRNPVERMYQDTFSDNFYNRPILSHRNTVWLCYEVKTKGPSRPPLDAKIFRGQV
YSKLKYHPEMRFFHWFSKWRKLHRDQEYEVTWYISWSPCTKCTRDVATFLAEDPKVTLTI
MNPQIRNMVEQMEPDIFVYYFNNRPILSGRNTVWLCYEVKTKDPSGPPLDANIFQGKLY
PEAKDHPEMKELHWFRKWRQLHRDQEYEVTWYVSWSPCTRCANSVATFLAEDPKVTLTIF
MKPHFRNTVERMYRDTFSYNFYNRPILSRRNTVWLCYEVKTKGPSRPPLDAKIFRGQV
YSELKYHPEMRFFHWFSKWRKLHRDQEYEVTWYISWSPCTKCTRDMATFLAEDPKVTLTI
LYFLGKIHSWNLDRNQHYRLTCFISWSPCYDCAQKLTTFLKENHHISLHILASRIYTHNRFG
INEIKSMGLDETQCYQVTCYLTWSPCSSCAWELVDFIKAHDHLNLGIFASRLYYHWCKPQ
CPECAGEVAEFLARHSNVNLTIFTARLCYFWDTDYQEGLCSLSQEGASVKIMGYKDFV
In some embodiments, fusion proteins as provided herein comprise the full-length amino acid of a nucleic acid editing enzyme, e.g., one of the sequences provided herein. In other embodiments, however, fusion proteins as provided herein do not comprise a full-length sequence of a nucleic acid editing enzyme, but only a fragment thereof. For example, in some embodiments, a fusion protein provided herein comprises a fragment of a nucleic acid editing enzyme. Exemplary nucleic acid editing domains (e.g. cytidine deaminases) are provided herein, and additional suitable sequences of such domains will be apparent to those of skill in the art.
Additional suitable nucleic-acid editing enzyme sequences, e.g., deaminase enzyme and domain sequences, that can be used according to aspects of this invention, e.g., that can be fused to a nuclease-inactive Cas9 domain, will be apparent to those of skill in the art based on this disclosure. In some embodiments, such additional enzyme sequences include deaminase enzyme or 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 any of the sequences provided herein.
Uracil Glycosylase Inhibitor Fusion Proteins
Some aspects of the disclosure relate to fusion proteins that comprise a uracil glycosylase inhibitor (UGI) domain. In some embodiments, the fusion protein comprises a nucleic acid programmable DNA binding protein, a cytidine deaminase domain, a Gam protein and a UGI domain. In some embodiments, any of the fusion proteins provided herein that comprise a nucleic acid programmable DNA binding protein (e.g., a Cas9 domain), a cytidine deaminase, and a Gam protein may be further fused to a UGI domain either directly or via a linker. Without wishing to be bound by any particular theory, cellular DNA-repair response to the presence of U:G heteroduplex DNA may be responsible for the decrease in nucleobase editing efficiency in cells. For example, uracil DNA glycosylase (UDG) catalyzes removal of U from DNA in cells, which may initiate base excision repair, with reversion of the U:G pair to a C:G pair as the most common outcome. As demonstrated in the Examples below, Uracil DNA Glycosylase Inhibitor (UGI) may inhibit human UDG activity. Thus, this disclosure contemplates a fusion protein comprising a napDNAbp, a cytidine deaminase domain, and a Gam protein, further fused to a UGI domain. This disclosure also contemplates a fusion protein comprising a Cas9 nickase-nucleic acid editing domain fused to a cytidine deaminase, and a Gam protein, which is further fused to a UGI domain. It should be understood that the use of a UGI domain may increase the editing efficiency of a nucleic acid editing domain that is capable of catalyzing a C to U change. For example, fusion proteins comprising a UGI domain may be more efficient in deaminating C residues.
In some embodiments, a UGI domain comprises a wild-type UGI or a UGI as set forth in SEQ ID NO: 362. 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 domain comprises a fragment of the amino acid sequence set forth in SEQ ID NO: 362. In some embodiments, a UGI fragment comprises an amino acid sequence that comprises 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% of the amino acid sequence of any of the UGI domains provided herein. In some embodiments, a UGI fragment comprises an amino acid sequence that comprises 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% of the amino acid sequence as set forth in SEQ ID NO: 362. In some embodiments, a UGI comprises an amino acid sequence homologous to the amino acid sequence set forth in SEQ ID NO: 362 or an amino acid sequence homologous to a fragment of the amino acid sequence set forth in SEQ ID NO: 362. 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 70% identical, at least 75% identical, at least 80% identical, at least 85% identical, at least 90% identical, at least 95% identical, at least 96% identical, at least 97% identical, at least 98% identical, at least 99% identical, at least 99.5% identical, or at least 99.9% identical to a wild type UGI or a UGI as set forth in SEQ ID NO: 362. In some embodiments, the UGI variant comprises a fragment of UGI, such that the fragment is at least 70% identical, at least 80% identical, at least 90% identical, at least 95% identical, at least 96% identical, at least 97% identical, at least 98% identical, at least 99% identical, at least 99.5% identical, or at least 99.9% to the corresponding fragment of wild-type UGI or a UGI as set forth in SEQ ID NO: 362. In some embodiments, the UGI comprises the following amino acid sequence:
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. Additionally, any proteins that block or inhibit base-excision repair as also within the scope of this disclosure. In some embodiments, a protein that binds DNA is used. In another embodiment, a substitute for UGI is used. In some embodiments, a uracil glycosylase inhibitor is a protein that binds single-stranded DNA. For example, a uracil glycosylase inhibitor may be a Envinia tasmaniensis single-stranded binding protein. In some embodiments, the single-stranded binding protein comprises the amino acid sequence (SEQ ID NO: 363). 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: 364). 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: 365). It should be appreciated that other uracil glycosylase inhibitors would be apparent to the skilled artisan and are within the scope of this disclosure. In some embodiments, a uracil glycosylase inhibitor is a protein that is homologous to any one of SEQ ID NOs: 363-365 or 366-376. In some embodiments, a uracil glycosylase inhibitor is a protein that is at least 50% identical, at least 55% identical at least 60% identical, at least 65% identical, at least 70% identical, at least 75% identical, at least 80% identical at least 85% identical, at least 90% identical, at least 95% identical, at least 96% identical, at least 98% identical, at least 99% identical, or at least 99.5% identical to any one of SEQ ID NOs: 363-365 or 366-376.
Fusion Proteins
Some aspects of the disclosure provide fusion proteins comprising (i) a nucleic acid programmable DNA binding protein (napDNAbp), (ii) a cytidine deaminase domain and (iii) a Gam protein. In some embodiments, the fusion protein further comprises a uracil glycosylase inhibitor (UGI) domain. In some embodiments, the nucleic acid programmable DNA binding protein is any of the nucleic acid programmable DNA binding proteins, or variants thereof, provided herein (e.g., nCas9). In some embodiments, the napDNAbp is a Cas9 domain. Any of the Cas9 domains (e.g., a nuclease active Cas9 protein, a nuclease-inactive dCas9 protein, or a Cas9 nickase protein) disclosed herein may be the napDNAbp of any of the fusion proteins, or variants thereof, provided herein. In some embodiments, the cytidine deaminase domain is any of the cytidine deaminase domainss, or variants thereof, provided herein. In some embodiments, the cytidine deaminase domain is an APOBEC cytidine deaminase domain (e.g. rAPOBEC1). In some embodiments, the Gam protein is any of the Gam proteins, or variants thereof, provided herein. In some embodiments, the Gam protein is a Gam from bacteriophage Mu. In some embodiments, the UGI domain is any of the UGI domains, or variants thereof, provided herein. In some embodiments, the UGI domain comprises an amino acid sequence that is at least 80% (e.g., 85%, 90%, 95%, 98%, or 98%) identical to SEQ ID NO: 362. In some embodiments, the UGI domain comprises the amino acid sequence of SEQ ID NO: 362.
Some aspects of the disclosure provide fusion proteins comprising a nucleic acid programmable DNA binding protein (napDNAbp) a cytidine deaminase domain and a Gam protein. In some embodiments, any of the fusion proteins provided herein are base editors. In some embodiments, the napDNAbp is a Cas9 domain, a Cpf1 domain, a CasX domain, a CasY domain, a C2c1 domain, a C2c2 domain, aC2c3 domain, or an Argonaute domain. In some embodiments, the napDNAbp is any napDNAbp provided herein. In some embodiments, the napDNAbp is a Cas9 domain, which may be any of the Cas9 domains or Cas9 proteins (e.g., dCas9 or nCas9) provided herein. In some embodiments, any of the Cas9 domains or Cas9 proteins (e.g., dCas9 or nCas9) provided herein may be fused with any of the cytidine deaminases provided herein. In some embodiments, the fusion protein comprises the structure:
In some embodiments, the fusion protein further comprises a UGI domain. In some embodiments, the fusion protein further comprises one or more (e.g., 2, 3, 4, or 5) UGI domains. In some embodiments, the UGI domain is any of the UGI domains, or variants thereof, provided herein. In some embodiments, the fusion protein comprises the structure:
In some embodiments, the fusion protein further comprises a second UGI domain. In some embodiments, the second UGI domain is any of the UGI domains, or variants thereof, provided herein. In some embodiments, the second UGI domain is the same as the UGI domain. In some embodiments, the second UGI domain is different from the UGI domain. In some embodiments, the fusion protein comprises the structure:
In some embodiments, the fusion proteins provided herein, for example any of the fusion proteins comprising the above structures, do not include a linker sequence. In some embodiments, a linker is present between any of the proteins or domains provided herein. In some embodiments, the “-” used in the structures above indicates the presence of an optional linker. In some embodiments, the “-” may be any of the linkers provided herein. In some embodiments, the Gam protein and the cytidine deaminase domain are fused via any of the linkers provided herein. In some embodiments, the Gam protein and the napDNAbp are fused via any of the linkers provided herein. In some embodiments, the Gam protein and the UGI domain are fused via any of the linkers provided herein. In some embodiments, the Gam protein and the second UGI domain are fused via any of the linkers provided herein.
In some embodiments, the cytidine deaminase domain and the Gam protein are fused via any of the linkers provided herein. In some embodiments, the cytidine deaminase domain and the napDNAbp are fused via any of the linkers provided herein. In some embodiments, the cytidine deaminase domain and the UGI domain are fused via any of the linkers provided herein. In some embodiments, the cytidine deaminase domain and the second UGI domain are fused via any of the linkers provided herein. In some embodiments, the napDNAbp and the Gam protein are fused via any of the linkers provided herein. In some embodiments, the napDNAbp and the cytidine deaminase domain are fused via any of the linkers provided herein. In some embodiments, the napDNAbp and the UGI domain are fused via any of the linkers provided herein. In some embodiments, the napDNAbp and the second UGI domain are fused via any of the linkers provided herein. In some embodiments, the UGI domain and the Gam protein are fused via any of the linkers provided herein. In some embodiments, the UGI domain and the cytidine deaminase domain are fused via any of the linkers provided herein. In some embodiments, the UGI domain and the napDNAbp domain are fused via any of the linkers provided herein. In some embodiments, the UGI domain and the second UGI domain are fused via any of the linkers provided herein. In some embodiments, the second UGI domain and the Gam protein are fused via any of the linkers provided herein. In some embodiments, the second UGI domain and the cytidine deaminase domain are fused via any of the linkers provided herein. In some embodiments, the second UGI domain and the napDNAbp domain are fused via any of the linkers provided herein. In some embodiments, the second UGI domain and the UGI domain are fused via any of the linkers provided herein.
For example, in some embodiments the domains and/or proteins described above are fused via any of the linkers provided below in the section entitled “Linkers”. In some embodiments, any of the domains and/or proteins provided herein are fused via a linker that comprises between 1 and 200 amino acids. In some embodiments, any of the domains and/or proteins provided herein are fused via a linker that comprises or consists of 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, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, or more amino acids in length. In some embodiments, any of the domains and/or proteins provided herein are fused via a linker that comprises from 1 to 5, 1 to 10, 1 to 20, 1 to 30, 1 to 40, 1 to 50, 1 to 60, 1 to 80, 1 to 100, 1 to 150, 1 to 200, 5 to 10, 5 to 20, 5 to 30, 5 to 40, 5 to 60, 5 to 80, 5 to 100, 5 to 150, 5 to 200, 10 to 20, 10 to 30, 10 to 40, 10 to 50, 10 to 60, 10 to 80, 10 to 100, 10 to 150, 10 to 200, 20 to 30, 20 to 40, 20 to 50, 20 to 60, 20 to 80, 20 to 100, 20 to 150, 20 to 200, 30 to 40, 30 to 50, 30 to 60, 30 to 80, 30 to 100, 30 to 150, 30 to 200, 40 to 50, 40 to 60, 40 to 80, 40 to 100, 40 to 150, 40 to 200, 50 to 60 50 to 80, 50 to 100, 50 to 150, 50 to 200, 60 to 80, 60 to 100, 60 to 150, 60 to 200, 80 to 100, 80 to 150, 80 to 200, 100 to 150, 100 to 200, or 150 to 200 amino acids in length. In some embodiments, any of the domains and/or proteins provided herein are fused via a linker that comprises 4, 9, 10, 16, or 32, amino acids in length. In some embodiments, any of the domains and/or proteins provided herein are fused via a linker that comprises the amino acid sequence of SGSETPGTSESATPES (SEQ ID NO: 377), SGGS (SEQ ID NO: 378), SGGSSGSETPGTSESATPESSGGS (SEQ ID NO: 379), SGGSSGGSSGSETPGTSESATPESSGGSSGGS (SEQ ID NO: 380), or GGSGGSPGSPAGSPTSTEEGTSESATPESGPGTSTEPSEGSAPGSPAGSPTSTEEGTSTEPS EGSAPGTSTEPSEGSAPGTSESATPESGPGSEPATSGGSGGS (SEQ ID NO: 381). In some embodiments, any of the domains and/or proteins provided herein are fused via a linker comprising the amino acid sequence SGSETPGTSESATPES (SEQ ID NO: 377), which may also be referred to as the XTEN linker. In some embodiments, the linker is 24 amino acids in length. In some embodiments, the linker comprises the amino acid sequence SGGSSGGSSGSETPGTSESATPES (SEQ ID NO: 382). In some embodiments, the linker is 40 amino acids in length. In some embodiments, the linker comprises the amino acid sequence SGGSSGGSSGSETPGTSESATPESSGGSSGGSSGGSSGGS (SEQ ID NO:383). In some embodiments, the linker is 64 amino acids in length. In some embodiments, the linker comprises the amino acid sequence SGGSSGGSSGSETPGTSESATPESSGGSSGGSSGGSSGGSSGSETPGTSESATPESSGGSSG GS (SEQ ID NO: 384). In some embodiments, the linker is 92 amino acids in length. In some embodiments, the linker comprises the amino acid sequence PGSPAGSPTSTEEGTSESATPESGPGTSTEPSEGSAPGSPAGSPTSTEEGTSTEPSEGSAPG TSTEPSEGSAPGTSESATPESGPGSEPATS (SEQ ID NO: 385). In some embodiments, the linker is 10 amino acids in length. In some embodiments, the linker comprises the amino acid sequence SGGSGGSGGS (SEQ ID NO: 386)
In some embodiments, the Gam protein and the cytidine deaminase domain of any of the fusion proteins provided herein are fused via a linker comprising from 10-20 amino acids in length. In some embodiments, the Gam protein and the cytidine deaminase domain of any of the fusion proteins provided herein are fused via a linker comprising 16 amino acids in length. In some embodiments, the Gam protein and the cytidine deaminase domain of any of the fusion proteins provided herein are fused via a linker comprising the amino acid sequence SGSETPGTSESATPES (SEQ ID NO: 377).
In some embodiments, the cytidine deaminase domain and the napDNAbp of any of the fusion proteins provided herein are fused via a linker comprising from 10-20 amino acids in length, or from 25-40 amino acids in length. In some embodiments, the cytidine deaminase domain and the napDNAbp of any of the fusion proteins provided herein are fused via a linker comprising 16 or 32 amino acids in length. In some embodiments, the cytidine deaminase domain and the napDNAbp of any of the fusion proteins provided herein are fused via a linker comprising the amino acid sequence SGSETPGTSESATPES (SEQ ID NO: 377) or SGGSSGGSSGSETPGTSESATPESSGGSSGGS (SEQ ID NO: 380).
In some embodiments, the napDNAbp and the UGI domain of any of the fusion proteins provided herein are fused via a linker comprising from 1-8 amino acids in length, or from 4-15 amino acids in length. In some embodiments, the napDNAbp and the UGI domain of any of the fusion proteins provided herein are fused via a linker comprising 4, 9 or 10 amino acids in length. In some embodiments, the napDNAbp and the UGI domain of any of the fusion proteins provided herein are fused via a linker comprising the amino acid sequence SGGSGGSGGS (SEQ ID NO: 386) or SGGS (SEQ ID NO: 378).
In some embodiments, the UGI domain and the second UGI domain of any of the fusion proteins provided herein are fused via a linker comprising from 2-15 amino acids in length. In some embodiments, the UGI domain and the second UGI domain of any of the fusion proteins provided herein are fused via a linker comprising 9 or 10 amino acids in length. In some embodiments, the UGI domain and the second UGI domain of any of the fusion proteins provided herein are fused via a linker comprising the amino acid sequence SGGSGGSGGS (SEQ ID NO: 386).
Linkers
In certain embodiments, linkers may be used to link any of the proteins or protein domains described herein. 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 include 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 is an amino acid or a plurality of amino acids (e.g., a peptide or protein). In some embodiments, the linker is a bond (e.g., a covalent bond), an organic molecule, group, polymer, or chemical moiety. In some embodiments, the linker is 2-100 amino acids in length, for example, 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, 30, 30-35, 35-40, 40-45, 45-50, 50-60, 60-70, 70-80, 80-90, 90-100, 100-110, 110-120, 120-130, 130-140, 140-150, or 150-200 amino acids in length. Longer or shorter linkers are also contemplated. In some embodiments, a linker comprises the amino acid sequence SGSETPGTSESATPES (SEQ ID NO: 377), which may also be referred to as the XTEN linker. In some embodiments, a linker comprises the amino acid sequence SGGS (SEQ ID NO: 378). In some embodiments, a linker comprises (SGGS)n (SEQ ID NO: 387), (GGGS)n (SEQ ID NO: 388), (GGGGS)n (SEQ ID NO: 389), (G)n, (EAAAK)n (SEQ ID NO: 390), (GGS)n (SEQ ID NO:391), SGSETPGTSESATPES (SEQ ID NO: 377), or (XP)n motif, or a combination of any of these, wherein n is independently an integer between 1 and 30, and wherein X is any amino acid. In some embodiments, n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15. In some embodiments, a linker comprises SGSETPGTSESATPES (SEQ ID NO: 377), and SGGS (SEQ ID NO: 378). In some embodiments, a linker comprises SGGSSGSETPGTSESATPESSGGS (SEQ ID NO: 379). In some embodiments, a linker comprises SGGSSGGSSGSETPGTSESATPESSGGSSGGS (SEQ ID NO: 380). In some embodiments, a linker comprises GGSGGSPGSPAGSPTSTEEGTSESATPESGPGTSTEPSEGSAPGSPAGSPTSTEEGTSTEPS EGSAPGTSTEPSEGSAPGTSESATPESGPGSEPATSGGSGGS (SEQ ID NO: 381). In some embodiments, the linker is 24 amino acids in length. In some embodiments, the linker comprises the amino acid sequence SGGSSGGSSGSETPGTSESATPES (SEQ ID NO: 382). In some embodiments, the linker is 40 amino acids in length. In some embodiments, the linker comprises the amino acid sequence SGGSSGGSSGSETPGTSESATPESSGGSSGGSSGGSSGGS (SEQ ID NO: 383). In some embodiments, the linker is 64 amino acids in length. In some embodiments, the linker comprises the amino acid sequence SGGSSGGSSGSETPGTSESATPESSGGSSGGSSGGSSGGSSGSETPGTSESATPESSGGSSG GS (SEQ ID NO: 384). In some embodiments, the linker is 92 amino acids in length. In some embodiments, the linker comprises the amino acid sequence PGSPAGSPTSTEEGTSESATPESGPGTSTEPSEGSAPGSPAGSPTSTEEGTSTEPSEGSAPG TSTEPSEGSAPGTSESATPESGPGSEPATS (SEQ ID NO: 385). It should be appreciated that any of the linkers provided herein may be used to link a Gam protein and a cytidine deaminase domain, a cytidine deaminase domain and a napDNAbp, a napDNAbp and a UGI domain, and/or a UGI domain and a second UGI domain in any of the fusion proteins provided herein.
NLS
Some aspects of the disclosure provide fusion proteins (e.g., any of the fusion proteins provided herein) that comprise one or more NLSs. The term “nuclear localization sequence” or “NLS” refers to an amino acid sequence that promotes import of a protein into the cell nucleus, for example, by nuclear transport. Nuclear localization sequences are known in the art and would be apparent to the skilled artisan. For example, NLS sequences are described in Plank et al., international PCT application, PCT/EP2000/011690, filed Nov. 23, 2000, published asWO/2001/038547 on May 31, 2001, the contents of which are incorporated herein by reference for their disclosure of exemplary nuclear localization sequences. In some embodiments, the NLS is a bipartite nuclear localization sequence (BPNLS), e.g., KRTADGSEFEPKKKRKV (SEQ ID NO: 405). In some embodiments, a NLS comprises the amino acid sequence PKKKRKV (SEQ ID NO: 392), MDSLLMNRRKFLYQFKNVRWAKGRRETYLC (SEQ ID NO: 393), or KRTADGSEFEPKKKRKV (SEQ ID NO: 405).
In some embodiments, fusion proteins provided herein further comprise a nuclear localization sequence (NLS). In some embodiments, the NLS is fused to the N-terminus of the fusion protein. In some embodiments, the NLS is fused to the C-terminus of the fusion protein. In some embodiments, the NLS is fused to the N-terminus of the UGI domain. In some embodiments, the NLS is fused to the C-terminus of the UGI domain. In some embodiments, the NLS is fused to the N-terminus of the napDNAbp. In some embodiments, the NLS is fused to the C-terminus of the napDNAbp. In some embodiments, the NLS is fused to the N-terminus of the cytidine deaminase domain. In some embodiments, the NLS is fused to the C-terminus of the cytidine deaminase domain. In some embodiments, the NLS is fused to the N-terminus of the Gam protein. In some embodiments, the NLS is fused to the C-terminus of the Gam protein. In some embodiments, the NLS is fused to the N-terminus of the second UGI domain. In some embodiments, the NLS is fused to the C-terminus of the second UGI domain. In some embodiments, the NLS is fused to the fusion protein via one or more linkers. In some embodiments, the NLS is fused to the fusion protein without a linker. In some embodiments, the NLS comprises an amino acid sequence of any one of the NLS sequences provided or referenced herein. In some embodiments, the NLS comprises an amino acid sequence PKKKRKV (SEQ ID NO: 392), MDSLLMNRRKFLYQFKNVRWAKGRRETYLC (SEQ ID NO: 393), or KRTADGSEFEPKKKRKV (SEQ ID NO: 405).
Some aspects of the disclosure provide fusion proteins that are capable of editing a base within a nucleic acid molecule (e.g., DNA or RNA). In some embodiments, any of the fusion proteins provided herein are base editors. Exemplary base editors are provided below. For Example, the amino acid sequences of BE3, BE4, BE3-Gam and BE4-Gam, which are described in the Examples, are provided below. In some embodiments, the fusion protein comprises an amino acid sequence that is at least 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% of the amino acid sequence of any of the fusion proteins provided herein. In some embodiments, a fusion protein 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 the amino acid sequence of BE3-Gam or BE4-Gam, provided below. In some embodiments, the fusion protein comprises the amino acid sequence of BE3-Gam or BE4-Gam, provided below.
Exemplary Base Editors:
Amino acid sequences of exemplary base editors (e.g., for BE3-Gam, BE4, and BE4-Gam) are provided below. Domains of the below base editors are identified, for the purposes of clarity, using text formatting. Gam is indicated in bold text, linkers are indicated by underlining, the cytidine deaminase domain (e.g., APOBEDC1) is indicated in italics, the napDNAbp (e.g., nCas9) is indicated in unformatted text, the UGI domain is indicated in bold italics, and the NLS is indicated in double underlining. It should be appreciated that amino acid sequences provided herein, for example base editors, cytidine deaminases, napDNAbps, Gam proteins, and UGI domains need not include an N-terminal methionine (M) residue. Accordingly, the disclosure contemplates any of the proteins provided herein absent an N-terminal M residue.
MSSETGPVAVDPTLRRRIEPHEFEVFFDPRELRKETCLLYEINWGGRHSIWRHTSQNTNKHVE
VNFIEKFTTERYFCPNTRCSITWFLSWSPCGECSRAITEFLSRYPHVTLFIYIARLYHHADPRNR
QGLRDLISSGVTIQIMTEQESGYCWRNFVNYSPSNEAHWPRYPHLWVRLYVLELYCHLGLPPC
LNILRRKQPQLTFFTIALQSCHYQRLPPHILWATGLK
SGSETPGTSESATPESDKKYSIGLAI
SGGS
PKKKRKV
MAKPAKRIKSAAAAYVPQNRDAVITDIKRIGDLQREASRLETEMNDAIAEITEKFA
ARIAPIKTDIETLSKGVQGWCEANRDELTNGGKVKTANLVTGDVSWRVRPPSVSIR
GMDAVMETLERLGLQRFIRTKQEINKEAILLEPKAVAGVAGITVKSGIEDFSIIPFE
QEAGI
SGSETPGTSESATPES
SSETGPVAVDPTLRRRIEPHEFEVFFDPRELRKETCLLYEIN
WGGRHSIWRHTSQNTNKHVEVNFIEKFTTERYFCPNTRCSITWFLSWSPCGECSRAITEFLSR
YPHVTLFIYIARLYHHADPRNRQGLRDLISSGVTIQIMTEQESGYCWRNFVNYSPSNEAHWPRY
PHLWVRLYVLELYCIILGLPPCLNILRRKQPQLTFFTIALQSCHYQRLPPHILWATGLK
SGSET
PGTSESATPESDKKYSIGLAIGTNSVGWAVITDEYKVPSKKFKVLGNTDRHSIKKNLIGA
SGGS
PKKKRKV
MSSETGPVAVDPTLRRRIEPHEFEVFFDPRELRKETCLLYEINWGGRHSIWRHTSQNTNKHV
EVNFIEKFTTERYFCPNTRCSITWFLSWSPCGECSRAITEFLSRYPHVTLFIYIARLYHHADPRN
RQGLRDLISSGVTIQIMTEQESGYCWRNFVNYSPSNEAHWPRYPHLWVRLYVLELYCIILGLPP
CLNILRRKQPQLTFFTIALQSCHYQRLPPHILWATGLK
SGGSSGGSSGSETPGTSESATPESS
GGSSGGSDKKYSIGLAIGTNSVGWAVITDEYKVPSKKFKVLGNTDRHSIKKNLIGALLF
SGGSGGSGGS
SGGS
PKKKRK
MAKPAKRIKSAAAAYVPQNRDAVITDIKRIGDLQREASRLETEMNDAIAEITEKFA
ARIAPIKTDIETLSKGVQGWCEANRDELTNGGKVKTANLVTGDVSWRVRPPSVSIR
GMDAVMETLERLGLQRFIRTKQEINKEAILLEPKAVAGVAGITVKSGIEDFSIIPFE
QEAGI
SGSETPGTSESATPES
SSETGPVAVDPTLRRRIEPHEFEVFFDPRELRKETCLLYEIN
WGGRHSIWRHTSQNTNKHVEVNFIEKETTERYFCPNTRCSITWFLSWSPCGECSRAITEFLSR
YPHVTLFIYIARLYHHADPRNRQGLRDLISSGVTIQIMTEQESGYCWRNFVNYSPSNEAHWPRY
PHLWVRLYVLELYCIILGLPPCLNILRRKQPQLTFFTIALQSCHYQRLPPHILWATGLKSGGSS
GGSSGSETPGTSESATPESSGGSSGGSDKKYSIGLAIGTNSVGWAVITDEYKVPSKKFKV
SGGSGGSGGS
SGGS
PKKKRK
The description of exemplary embodiments of the above disclosure is provided for illustration purposes only and not meant to be limiting. Additional fusion proteins and methods of using the same, e.g., variations of the exemplary systems described in detail above, are also embraced by this disclosure.
UNG Activity is Required for Byproduct Formation
It was hypothesized that undesired base editing byproducts arise during base excision repair due to the formation and error-prone resolution of abasic sites within the uracil-containing DNA strand. This hypothesis predicts that the product purity of base editing in cells lacking uracil Nglycosylase (UNG) should be greatly improved. To test this prediction, HAP1 cells (a haploid human cell line) and HAP1 UNG-cells were nucleofected with plasmids encoding BE3 and sgRNAs targeting the EMX1, FANCF, HEK2, HEK3, HEK4, or RNF2 loci (see
Fusion with Gam Further Reduces Indel Frequencies and Improves Product Purity
For some genome editing applications, the formation of indels confounds research or poses safety risks. It was therefore sought to further decrease indel frequencies that arise from base editing. It was hypothesized that the majority of base editing-induced indels occur as a result of DNA-(apurinic or apyrimidinic site) lyase (AP lyase), a BER enzyme that converts abasic sites into ssDNA nicks (25). Since base editors nick the strand opposite the U, cleavage of the glycosidic bond by UNG followed by processing of the resulting AP site by AP lyase would result in a DSB, which promotes indel formation. This model is consistent with the observation of greatly reduced indel frequencies in UNG knockout cells (
BE3-Gam decreased indel frequencies relative to BE3 at all six genomic loci tested by an average of 1.7±0.3-fold (
BE4-Gam exhibited greatly decreased indel frequencies relative to BE4 at all genomic loci tested, with an average decrease of 3.3±0.8-fold (
For base editing applications in which minimizing indel production is critical, BE4-Gam or BE3-Gam may be preferred (
Collectively, these developments advance the state-of-the-art in programmable C:G to T:A base pair conversion, and thereby increase the utility and applicability of base editing. Findings also suggest that Gam has the potential to be repurposed to minimize indel formation in other genome editing applications. Finally, relationships among uracil incorporation, UNG activity, and cellular DNA repair outcomes illuminated in this study may guide future efforts to understand or manipulate eukaryotic DNA repair.
Cloning of Plasmids
All plasmids in this study were generated by USER cloning using Phusion U Hot Start polymerase (Thermo Fisher). Deaminase and SSB genes were synthesized as gBlocks Gene Fragments (Integrated DNA Technologies), and Target-AID was obtained from Addgene (plasmid #79620). Protein sequences are listed in the Supplementary Notes.
Cell Culture
HEK293T (ATCC CRL-3216) cells were maintained in Dulbecco's Modified Eagle's Medium plus GlutaMax (ThermoFisher) supplemented with 10% (v/v) fetal bovine serum (FBS), at 37° C. with 5% CO2. HAP1 (Horizon Discovery C631) and HAP1 UNG-(Horizon Discovery HZGHC001531c012) were maintained in Iscove's Modified Dulbecco's Medium plus GlutaMax (ThermoFisher Scientific) supplemented with 10% (v/v) fetal bovine serum (FBS), at 37° C. with 5% CO2.
Transfections
HEK293T cells were seeded on 48-well collagen-coated BioCoat plates (Corning) and transfected at approximately 75% confluency. Briefly, 750 ng of BE and 250 ng of sgRNA expression plasmids were transfected using 1.5 μL of Lipofectamine 2000 (ThermoFisher Scientific) per well according to the manufacturer's protocol. HAP1 and HAP1 UNG-cells were nucleofected using the SE Cell Line 4DNucleofector™ X Kit S (Lonza) according to the manufacturer's protocol. Briefly, 4×105 cells were nucleofected with 300 ng of BE and 100 ng of sgRNA expression plasmids using the 4DNucleofector™ program DZ-113.
High-Throughput DNA Sequencing of Genomic DNA Samples
Transfected cells were harvested after 3 d and the genomic DNA was isolated by incubating cells in lysis buffer (10 mM Tris-HCl pH 8.0, 0.05% SDS, 25 μg/mL proteinase K) at 37° C. for 1 hr followed by 80° C. for 30 min. Genomic regions of interest were amplified by PCR with flanking HTS primer pairs as previously described 6,1. PCR amplification was carried out with Phusion high-fidelity DNA polymerase (ThermoFisher) according to the manufacturer's instructions and as previously described. Purified DNA was amplified by PCR with primers containing sequencing adaptors. The products were gel-purified and quantified using the QuantiT™ PicoGreen dsDNA Assay Kit (ThermoFisher) and KAPA Library Quantification Kit-Illumina (KAPA Biosystems). Samples were sequenced on an Illumina MiSeq as previously described.
Data Analysis
Sequencing reads were automatically demultiplexed using MiSeq Reporter (IIlumina), and individual FASTQ files were analyzed with a custom Matlab script as previously described (1). Each read was pairwise aligned to the appropriate reference sequence using the Smith-Waterman algorithm. Base calls with a Q-score below 31 were replaced with Ns and were thus excluded in calculating nucleotide frequencies. This treatment yields an expected MiSeq basecalling error rate of approximately 1 in 1,000. Aligned sequences in which the read and reference sequence contained no gaps were stored in an alignment table from which base frequencies could be tabulated for each locus.
Indel frequencies were quantified with the previously described Matlab script 5,6,1. Briefly, sequencing reads were scanned for exact matches to two 10-bp sequences that flank both sides of a window in which indels might occur. If no exact matches were located, the read was excluded from analysis. If the length of this indel window exactly matched the reference sequence the read was classified as not containing an indel. If the indel window was two or more bases longer or shorter than the reference sequence, then the sequencing read was classified as an insertion or deletion, respectively.
In order to evaluate interdependency (linkage disequilibrium) between the base editing outcomes at the multiple target cytidines within an editing window, target site sequences from BE treated cells were analyzed by a custom Python script (Supplementary Note 1). Briefly, sequencing reads were scanned for exact matches to two 7-bp sequences that flank each side of the protospacer. If the intervening region was not exactly 20-bp, then it was excluded further analysis. The protospacer sequences were further filtered into four groups based upon the identity of the nucleotide at the position with the most non-T editing outcomes (the primary target C). For each of these four groups as well as the entire pool, we tallied the nucleotide abundance at each of the 20 positions within the protospacer.
napDNAbp Complexes with Guide RNAs
Some aspects of this disclosure provide complexes comprising any of the fusion proteins provided herein, and a nucleic acid (e.g., DNA or RNA) bound to the napDNAbp of any of the fusion proteins provided herein. Some aspects of this disclosure provide complexes comprising any of the fusion proteins provided herein, and a guide RNA bound to a Cas9 domain (e.g., a dCas9, a nuclease active Cas9, or a Cas9 nickase) of fusion protein.
In some embodiments, the guide RNA is from 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 immediately adjacent to a canonical PAM sequence (NGG). In some embodiments, the guide RNA is complementary to a sequence associated with a disease or disorder.
Methods of Using Fusion Proteins
Some aspects of the disclosure provide methods for using the fusion proteins (e.g., base editors) provided herein. Some aspects of this disclosure provide methods of using the 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 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 a canonical PAM sequence (NGG). 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 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 base 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 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 to C or A to 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. 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).38
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 base editing 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 a Gam protein, a napDNAbp and a cytidine deaminase domain 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 base 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 base editor 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
It will be apparent to those of skill in the art that in order to target a base editor 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 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:nucleic acid editing enzyme/domain fusion protein. In some embodiments, the guide RNA comprises a structure 5′-[guide sequence]-guuuuagagcuagaaauagcaaguuaaaauaaggcuaguccguuaucaacuugaaaaaguggcaccgagucggugcuuuuu-3′ (SEQ ID NO: 398), 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 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. Some exemplary guide RNA sequences suitable for targeting Cas9 fusion proteins to specific target sequences are provided below. Exemplary guide RNA structures, including guide RNA backbone sequences, are described, for example, in Jinek M, et al. (2012) A programmable dual-RNA-guided DNA endonuclease in adaptive bacterial immunity. Science, 337, 816-812; Mali P, et al. (2013) Cas9 as a versatile tool for engineering biology. Nature Methods, 10, 957-963; Li J F, et al. (2013) Multiplex and homologous recombination-mediated genome editing in Arabidopsis and Nicotiana benthamiana using guide RNA and Cas9. Nature Biotech, 31, 688-691; Hwang W Y, et al. (2013) Efficient in vivo genome editing using RNA-guided nucleases. Nat Biotechnol, 31, 227-229; Cong L, et al. (2013) Multiplex genome engineering using CRIPSR/Cas systems. Science, 339, 819-823; Cho S W, et al. (2013) Targeted genome engineering in human cells with the Cas9 RNA-guided endonuclease. Nat Biotechnol, 31, 230-232; Jinek M J, et al. (2013) RNA-programmed genome editing in human cells. eLIFE, 2:e00471; DiCarlo J E, et al. (2013) Genome engineering in Saccharomyces cerevisiae using CRISPR-Cas systems. Nucl Acids Res, 41, 4336-4343; Qi L S, et al. (2013) Repruposing CRISPR as an RNA-Guided Platform for Sequence-Specific Control of Gene Expression. Cell, 152, 1173-1183; and Briner A E, et al. (2014) Guide RNA functional modules direct Cas9 activity and orthogonality. Mol Cell, 56, 333-339; each of which is incorporated herein by reference.
Base Editor Efficiency
Some aspects of the disclosure are based on the recognition that any of the base editors provided herein are capable of modifying a specific nucleotide base without generating a significant proportion of indels. An “indel”, as used herein, refers to the insertion or deletion of a nucleotide base within a nucleic acid. Such insertions or deletions can lead to frame shift mutations within a coding region of a gene. In some embodiments, it is desirable to generate base editors that efficiently modify (e.g. mutate or deaminate) a specific nucleotide within a nucleic acid, without generating a large number of insertions or deletions (i.e., indels) in the nucleic acid. In certain embodiments, any of the base editors provided herein are capable of generating a greater proportion of intended modifications (e.g., point mutations or deaminations) versus indels. In some embodiments, the base editors provided herein are capable of generating a ratio of intended point mutations to indels that is greater than 1:1. In some embodiments, the base editors provided herein are capable of generating a ratio of intended point mutations to indels that is at least 1.5:1, at least 2:1, at least 2.5:1, at least 3:1, at least 3.5:1, at least 4:1, at least 4.5:1, at least 5:1, at least 5.5:1, at least 6:1, at least 6.5:1, at least 7:1, at least 7.5:1, at least 8:1, at least 10:1, at least 12:1, at least 15:1, at least 20:1, at least 25:1, at least 30:1, at least 40:1, at least 50:1, at least 100:1, at least 200:1, at least 300:1, at least 400:1, at least 500:1, at least 600:1, at least 700:1, at least 800:1, at least 900:1, or at least 1000:1, or more. The number of intended mutations and indels may be determined using any suitable method, for example the methods used in the below Examples.
In some embodiments, the base editors provided herein are capable of limiting formation of indels in a region of a nucleic acid. In some embodiments, the region is at a nucleotide targeted by a base editor or a region within 2, 3, 4, 5, 6, 7, 8, 9, or 10 nucleotides of a nucleotide targeted by a base editor. In some embodiments, any of the base editors provided herein are capable of limiting the formation of indels at a region of a nucleic acid to less than 1%, less than 1.5%, less than 2%, less than 2.5%, less than 3%, less than 3.5%, less than 4%, less than 4.5%, less than 5%, less than 6%, less than 7%, less than 8%, less than 9%, less than 10%, less than 12%, less than 15%, or less than 20%. The number of indels formed at a nucleic acid region may depend on the amount of time a nucleic acid (e.g., a nucleic acid within the genome of a cell) is exposed to a base editor. In some embodiments, an number or proportion of indels is determined after at least 1 hour, at least 2 hours, at least 6 hours, at least 12 hours, at least 24 hours, at least 36 hours, at least 48 hours, at least 3 days, at least 4 days, at least 5 days, at least 7 days, at least 10 days, or at least 14 days of exposing a nucleic acid (e.g., a nucleic acid within the genome of a cell) to a base editor.
Some aspects of the disclosure are based on the recognition that any of the base editors provided herein are capable of efficiently generating an intended mutation, such as a point mutation, in a nucleic acid (e.g. a nucleic acid within a genome of a subject) without generating a significant number of unintended mutations, such as unintended point mutations. In some embodiments, a intended mutation is a mutation that is generated by a specific base editor bound to a gRNA, specifically designed to generate the intended mutation. In some embodiments, the intended mutation is a mutation associated with a disease or disorder. In some embodiments, the intended mutation is a cytosine (C) to thymine (T) point mutation associated with a disease or disorder. In some embodiments, the intended mutation is a guanine (G) to adenine (A) point mutation associated with a disease or disorder. In some embodiments, the intended mutation is a cytosine (C) to thymine (T) point mutation within the coding region of a gene. In some embodiments, the intended mutation is a guanine (G) to adenine (A) point mutation within the coding region of a gene. In some embodiments, the intended mutation is a point mutation that generates a stop codon, for example, a premature stop codon within the coding region of a gene. In some embodiments, the intended mutation is a mutation that eliminates a stop codon. In some embodiments, the intended mutation is a mutation that alters the splicing of a gene. In some embodiments, the intended mutation is a mutation that alters the regulatory sequence of a gene (e.g., a gene promotor or gene repressor). In some embodiments, any of the base editors provided herein are capable of generating a ratio of intended mutations to unintended mutations (e.g., intended point mutations:unintended point mutations) that is greater than 1:1. In some embodiments, any of the base editors provided herein are capable of generating a ratio of intended mutations to unintended mutations (e.g., intended point mutations:unintended point mutations) that is at least 1.5:1, at least 2:1, at least 2.5:1, at least 3:1, at least 3.5:1, at least 4:1, at least 4.5:1, at least 5:1, at least 5.5:1, at least 6:1, at least 6.5:1, at least 7:1, at least 7.5:1, at least 8:1, at least 10:1, at least 12:1, at least 15:1, at least 20:1, at least 25:1, at least 30:1, at least 40:1, at least 50:1, at least 100:1, at least 150:1, at least 200:1, at least 250:1, at least 500:1, or at least 1000:1, or more. It should be appreciated that the characteristics of the base editors described in the “Base Editor Efficiency” section, herein, may be applied to any of the fusion proteins, or methods of using the fusion proteins provided herein.
Methods for Editing Nucleic Acids
Some aspects of the disclosure provide methods for editing a nucleic acid. In some embodiments, the method is a method for editing a nucleobase of a nucleic acid (e.g., a base pair of a double-stranded DNA sequence). In some embodiments, the method comprises the steps of: a) contacting a target region of a nucleic acid (e.g., a double-stranded DNA sequence) with a complex comprising a base editor (e.g., any of the fusion proteins provided herein) and a guide nucleic acid (e.g., gRNA), wherein the target region comprises a targeted nucleobase pair, b) inducing strand separation of said target region, c) converting a first nucleobase of said target nucleobase pair in a single strand of the target region to a second nucleobase, and d) cutting no more than one strand of said target region, where a third nucleobase complementary to the first nucleobase base is replaced by a fourth nucleobase complementary to the second nucleobase; and the method results in less than 20% (e.g., less than 15%, 10%, 5%, 1%, 0.5% or 0.1%) indel formation in the nucleic acid. It should be appreciated that in some embodiments, step b is omitted. In some embodiments, the first nucleobase is a cytosine. In some embodiments, the second nucleobase is a deaminated cytosine, or a uracil. In some embodiments, the third nucleobase is a guanine. In some embodiments, the fourth nucleobase is an adenine. In some embodiments, the first nucleobase is a cytosine, the second nucleobase is a deaminated cytosine, or a uracil, the third nucleobase is a guanine, and the fourth nucleobase is an adenine. In some embodiments, the method results in less than 19%, 18%, 16%, 14%, 12%, 10%, 8%, 6%, 4%, 2%, 1%, 0.5%, 0.2%, or less than 0.1% indel formation. In some embodiments, the method further comprises replacing the second nucleobase with a fifth nucleobase that is complementary to the fourth nucleobase, thereby generating an intended edited base pair (e.g., C:G->T:A). In some embodiments, the fifth nucleobase is a thymine. In some embodiments, at least 5% of the intended basepaires are edited. In some embodiments, at least 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50% of the intended basepaires are edited.
In some embodiments, the ratio of intended products to unintended products in the target nucleotide is at least 2:1, 5:1, 10:1, 20:1, 30:1, 40:1, 50:1, 60:1, 70:1, 80:1, 90:1, 100:1, or 200:1, or more. In some embodiments, the ratio of intended point mutation to indel formation is greater than 1:1, 10:1, 50:1, 100:1, 500:1, or 1000:1, or more. In some embodiments, the cut single strand (nicked strand) is hybridized to the guide nucleic acid. In some embodiments, the cut single strand is opposite to the strand comprising the first nucleobase. In some embodiments, the base editor comprises a Cas9 domain. In some embodiments, the first base is cytosine, and the second base is not a G, C, A, or T. In some embodiments, the second base is uracil. In some embodiments, the first base is cytosine. In some embodiments, the second base is not a G, C, A, or T. In some embodiments, the second base is uracil. In some embodiments, the base editor inhibits base excision repair of the edited strand. In some embodiments, the base editor protects or binds the non-edited strand. In some embodiments, the base editor comprises UGI activity. In some embodiments, the base editor comprises nickase activity. In some embodiments, the intended edited basepair is upstream of a PAM site. In some embodiments, the intended edited base pair is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 nucleotides upstream of the PAM site. In some embodiments, the intended edited basepair is downstream of a PAM site. In some embodiments, the intended edited base pair is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 nucleotides downstream stream of the PAM site. In some embodiments, the method does not require a canonical (e.g., NGG) PAM site. In some embodiments, the nucleobase editor comprises a linker. In some embodiments, the linker is 1-25 amino acids in length. In some embodiments, the linker is 5-20 amino acids in length. In some embodiments, linker is 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 amino acids in length. In some embodiments, the target region comprises a target window, wherein the target window comprises the target nucleobase pair. In some embodiments, the target window comprises 1-10 nucleotides. In some embodiments, the target window is 1-9, 1-8, 1-7, 1-6, 1-5, 1-4, 1-3, 1-2, or 1 nucleotides in length. In some embodiments, the target window is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 nucleotides in length. In some embodiments, the intended edited base pair is within the target window. In some embodiments, the target window comprises the intended edited base pair. In some embodiments, the method is performed using any of the base editors provided herein. In some embodiments, a target window is a deamination window
In some embodiments, the disclosure provides methods for editing a nucleotide. In some embodiments, the disclosure provides a method for editing a nucleobase pair of a double-stranded DNA sequence. In some embodiments, the method comprises a) contacting a target region of the double-stranded DNA sequence with a complex comprising a base editor and a guide nucleic acid (e.g., gRNA), where the target region comprises a target nucleobase pair, b) inducing strand separation of said target region, c) converting a first nucleobase of said target nucleobase pair in a single strand of the target region to a second nucleobase, d) cutting no more than one strand of said target region, wherein a third nucleobase complementary to the first nucleobase base is replaced by a fourth nucleobase complementary to the second nucleobase, and the second nucleobase is replaced with a fifth nucleobase that is complementary to the fourth nucleobase, thereby generating an intended edited basepair, wherein the efficiency of generating the intended edited basepair is at least 5%. It should be appreciated that in some embodiments, step b is omitted. In some embodiments, at least 5% of the intended basepaires are edited. In some embodiments, at least 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50% of the intended basepaires are edited. In some embodiments, the method causes less than 19%, 18%, 16%, 14%, 12%, 10%, 8%, 6%, 4%, 2%, 1%, 0.5%, 0.2%, or less than 0.1% indel formation. In some embodiments, the ratio of intended product to unintended products at the target nucleotide is at least 2:1, 5:1, 10:1, 20:1, 30:1, 40:1, 50:1, 60:1, 70:1, 80:1, 90:1, 100:1, or 200:1, or more. In some embodiments, the ratio of intended point mutation to indel formation is greater than 1:1, 10:1, 50:1, 100:1, 500:1, or 1000:1, or more. In some embodiments, the cut single strand is hybridized to the guide nucleic acid. In some embodiments, the cut single strand is opposite to the strand comprising the first nucleobase. In some embodiments, the first base is cytosine. In some embodiments, the second nucleobase is not G, C, A, or T. In some embodiments, the second base is uracil. In some embodiments, the base editor inhibits base excision repair of the edited strand. In some embodiments, the base editor protects or binds the non-edited strand. In some embodiments, the nucleobase editor comprises UGI activity. In some embodiments, the nucleobase edit comprises nickase activity. In some embodiments, the intended edited basepair is upstream of a PAM site. In some embodiments, the intended edited base pair is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 nucleotides upstream of the PAM site. In some embodiments, the intended edited basepair is downstream of a PAM site. In some embodiments, the intended edited base pair is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 nucleotides downstream stream of the PAM site. In some embodiments, the method does not require a canonical (e.g., NGG) PAM site. In some embodiments, the nucleobase editor comprises a linker. In some embodiments, the linker is 1-25 amino acids in length. In some embodiments, the linker is 5-20 amino acids in length. In some embodiments, the linker is 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 amino acids in length. In some embodiments, the target region comprises a target window, wherein the target window comprises the target nucleobase pair. In some embodiments, the target window comprises 1-10 nucleotides. In some embodiments, the target window is 1-9, 1-8, 1-7, 1-6, 1-5, 1-4, 1-3, 1-2, or 1 nucleotides in length. In some embodiments, the target window is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 nucleotides in length. In some embodiments, the intended edited base pair occurs within the target window. In some embodiments, the target window comprises the intended edited base pair. In some embodiments, the nucleobase editor is any one of the base editors provided herein.
Pharmaceutical Compositions
In some embodiments, any of the fusion proteins, gRNAs, and/or complexes described herein are provided as part of a pharmaceutical composition. In some embodiments, the pharmaceutical composition comprises any of the fusion proteins provided herein. In some embodiments, the pharmaceutical composition comprises any of the complexes provided herein. In some embodiments, the pharmaceutical composition comprises a ribonucleoprotein complex comprising an RNA-guided nuclease (e.g., Cas9) that forms a complex with a gRNA and a cationic lipid. In some embodiments pharmaceutical composition comprises a gRNA, a nucleic acid programmable DNA binding protein, a cationic lipid, and a pharmaceutically acceptable excipient. Pharmaceutical compositions may optionally comprise one or more additional therapeutically active substances.
In some embodiments, compositions provided herein are administered to a subject, for example, to a human subject, in order to effect a targeted genomic modification within the subject. In some embodiments, cells are obtained from the subject and contacted with a any of the pharmaceutical compositions provided herein. In some embodiments, cells removed from a subject and contacted ex vivo with a pharmaceutical composition are re-introduced into the subject, optionally after the desired genomic modification has been effected or detected in the cells. Methods of delivering pharmaceutical compositions comprising nucleases are known, and are described, for example, in U.S. Pat. Nos. 6,453,242; 6,503,717; 6,534,261; 6,599,692; 6,607,882; 6,689,558; 6,824,978; 6,933,113; 6,979,539; 7,013,219; and 7,163,824, the disclosures of all of which are incorporated by reference herein in their entireties. Although the descriptions of pharmaceutical compositions provided herein are principally directed to pharmaceutical compositions which are suitable for administration to humans, it will be understood by the skilled artisan that such compositions are generally suitable for administration to animals or organisms of all sorts. Modification of pharmaceutical compositions suitable for administration to humans in order to render the compositions suitable for administration to various animals is well understood, and the ordinarily skilled veterinary pharmacologist can design and/or perform such modification with merely ordinary, if any, experimentation. Subjects to which administration of the pharmaceutical compositions is contemplated include, but are not limited to, humans and/or other primates; mammals, domesticated animals, pets, and commercially relevant mammals such as cattle, pigs, horses, sheep, cats, dogs, mice, and/or rats; and/or birds, including commercially relevant birds such as chickens, ducks, geese, and/or turkeys.
Formulations of the pharmaceutical compositions described herein may be prepared by any method known or hereafter developed in the art of pharmacology. In general, such preparatory methods include the step of bringing the active ingredient(s) into association with an excipient and/or one or more other accessory ingredients, and then, if necessary and/or desirable, shaping and/or packaging the product into a desired single- or multi-dose unit.
Pharmaceutical formulations may additionally comprise a pharmaceutically acceptable excipient, which, as used herein, includes any and all solvents, dispersion media, diluents, or other liquid vehicles, dispersion or suspension aids, surface active agents, isotonic agents, thickening or emulsifying agents, preservatives, solid binders, lubricants and the like, as suited to the particular dosage form desired. Remington's The Science and Practice of Pharmacy, 21st Edition, A. R. Gennaro (Lippincott, Williams & Wilkins, Baltimore, Md., 2006; incorporated in its entirety herein by reference) discloses various excipients used in formulating pharmaceutical compositions and known techniques for the preparation thereof. See also PCT application PCT/US2010/055131 (Publication number WO2011053982 A8, filed Nov. 2, 2010), incorporated in its entirety herein by reference, for additional suitable methods, reagents, excipients and solvents for producing pharmaceutical compositions comprising a nuclease. Except insofar as any conventional excipient medium is incompatible with a substance or its derivatives, such as by producing any undesirable biological effect or otherwise interacting in a deleterious manner with any other component(s) of the pharmaceutical composition, its use is contemplated to be within the scope of this disclosure.
In some embodiments, compositions in accordance with the present invention may be used for treatment of any of a variety of diseases, disorders, and/or conditions, including but not limited to one or more of the following: autoimmune disorders (e.g. diabetes, lupus, multiple sclerosis, psoriasis, rheumatoid arthritis); inflammatory disorders (e.g. arthritis, pelvic inflammatory disease); infectious diseases (e.g. viral infections (e.g., HIV, HCV, RSV), bacterial infections, fungal infections, sepsis); neurological disorders (e.g. Alzheimer's disease, Huntington's disease; autism; Duchenne muscular dystrophy); cardiovascular disorders (e.g. atherosclerosis, hypercholesterolemia, thrombosis, clotting disorders, angiogenic disorders such as macular degeneration); proliferative disorders (e.g. cancer, benign neoplasms); respiratory disorders (e.g. chronic obstructive pulmonary disease); digestive disorders (e.g. inflammatory bowel disease, ulcers); musculoskeletal disorders (e.g. fibromyalgia, arthritis); endocrine, metabolic, and nutritional disorders (e.g. diabetes, osteoporosis); urological disorders (e.g. renal disease); psychological disorders (e.g. depression, schizophrenia); skin disorders (e.g. wounds, eczema); blood and lymphatic disorders (e.g. anemia, hemophilia); etc.
Kits, Vectors, Cells
Some aspects of this disclosure provide kits comprising a nucleic acid construct, comprising (a) a nucleotide sequence encoding any of the fusion proteins 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 fusion protein (e.g., base editor) 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 any of the fusion proteins provided herein, a nucleic acid molecule encoding any of the fusion proteins provided herein, a complex comprising any of the fusion proteins provided herein and the gRNA, and/or a vector as provided herein.
The description of exemplary embodiments of the reporter systems above is provided for illustration purposes only and not meant to be limiting. Additional variations of the exemplary compostions and methods described in detail above, are also embraced by this disclosure.
This disclosure provides Cas9 variants in which one or more of the amino acid residues identified (e.g., 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 (e.g., 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 domains, 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: 11|WP_010922251|gi 499224711|type II CRISPR RNA-guided endonuclease Cas9 [Streptococcus pyogenes]; Sequence 2 (S2): SEQ ID NO: 12|WP_039695303|gi 746743737|type II CRISPR RNA-guided endonuclease Cas9 [Streptococcus gallolyticus]; Sequence 3 (S3): SEQ ID NO: 13|WP_045635197|gi 782887988|type II CRISPR RNA-guided endonuclease Cas9 [Streptococcus mitis]; Sequence 4 (S4): SEQ ID NO: 14|5AW_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. A similar approach can be employed to determine homologous amino acid residues suitable for mutation based on the amino acid mutations of Cas9 domains identified herein.
YSIGLD*IGTNSVGWAVITDEYKVPSKKFKVIGNTDRHSIKKNLI--GALLFDSG--ETAEATRIKRTARRRYT
YSIGLD*IGTNSVGWAVITDDYKVPAKENEVLGNTDKKYIKKNLL--GALLFDSG--ETAEATRIKRTARRRYT
YILGLD*IGITSVGYGII--DYET-----------------RDVIDAGVRIFKEANVENNEGRRSKRGARRLKR
KRIEEGIKELGSQIL-------KEHPVENTQLQNEKLYLYYLQNGRDMYVDQELDINRLSD----YDVDH*IVPQSFLKDD
KKLQNSLKELGSNILNEEKPSYIEDKVENSHLQNDQLFLYYIQNGKDMYTGDELDIDHLSD----YDIDH*IIPQAFIKDD
KRIEDSLKILASGL---DSNILKENPTDNNQLQNDRIFLYYLQNGKDMYTGEALDINQLSS----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: 11 are mutated as described herein. The residues in Cas9 sequences other than SEQ ID NO: 11 that correspond to the residues identified in SEQ ID NO: 11 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: 11 that correspond to mutations identified in SEQ ID NO: 11 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: 11, are referred to herein as “homologous” or “corresponding” mutations. For example, the mutations corresponding to the D10A mutation in 51 for the four aligned sequences above are D10A for S2, D9A for S3, and D13A for S4; the corresponding mutations for H840A in 51 are H850A for S2, H842A for S3, and H560 for S4; the corresponding mutation for X1219V in 51 are X1228V for S2, X1226 for S3, and X903V for S4, and so on.
A total of 250 Cas9 sequences (SEQ ID NOs: 11-260) from different species were aligned using the same algorithm and alignment parameters outlined above, and is provided in Patent Publication No. WO2017/070633, published Apr. 27, 2017, entitled “Evolved Cas9 domains For Gene Editing”; the entire contents of which are incorporated herein by reference. Additional suitable Cas9 homologues, as well as performing alignments of homologues, will be apparent to those of ordinary skill in the art based on this disclosure and knowledge in the field, and are within the scope of the present disclosure.
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: 11 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: 11, 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: 11.
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: 11 are provided herein. In some embodiments, the Cas9 variants provided herein comprise mutations corresponding to the D10A mutations in SEQ ID NO: 11, 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: 11.
Additional suitable Cas9 sequences in which amino acid residues homologous to residues 50, 86, 115, 108, 141, 175, 217, 230, 257, 261, 262, 267, 274, 284, 294, 331, 319, 324, 341, 388, 405, 409, 435, 461, 466, 480, 510, 522, 543, 548, 593, 653, 673, 694, 711, 712, 715, 772, 777, 798, 811, 839, 847, 955, 967, 991, 1063, 1139, 1199, 1207, 1219, 1224, 1227, 1229, 1256, 1264, 1296, 1318, 1356, and/or 1362 of SEQ ID NO: 11 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 residues 50, 86, 115, 108, 141, 175, 217, 230, 257, 261, 262, 267, 274, 284, 294, 331, 319, 324, 341, 388, 405, 409, 435, 461, 466, 480, 510, 522, 543, 548, 593, 653, 673, 694, 711, 712, 715, 772, 777, 798, 811, 839, 847, 955, 967, 991, 1063, 1139, 1199, 1207, 1219, 1224, 1227, 1229, 1256, 1264, 1296, 1318, 1356, and/or 1362 in SEQ ID NO: 9 are provided by this disclosure, for example, Cas9 variants comprising a A262T, K294R, S4091, E480K, E543D, M6941, and/or E1219V mutation.
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/US2018/048969, filed Aug. 30, 2018, which claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Application, U.S. Ser. No. 62/661,974, filed Apr. 24, 2018, and to U.S. Provisional Application, U.S. Ser. No. 62/551,938, filed Aug. 30, 2017, each of which is incorporated herein by reference.
This invention was made with government support under HR0011-17-2-0049, EB022376 and GM118062 awarded by DARPA and National Institutes of Health. The government has certain rights in the invention.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2018/048969 | 8/30/2018 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/139645 | 7/18/2019 | WO | A |
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| Number | Date | Country | |
|---|---|---|---|
| 20200190493 A1 | Jun 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62661974 | Apr 2018 | US | |
| 62551938 | Aug 2017 | US |
