The instant application contains a Sequence Listing which has been submitted electronically in ASCII format and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Apr. 25, 2018, is named P14458-02_SL.txt and is 43,512 bytes in size.
RNA-binding proteins are integral to the function of RNAs. Many RNA functions are mediated by associating proteins (e.g., chromatin modification by 1ncRNA-bound enzymes, recruitment of telomerase RNA to telomeres by protein subunits of telomerase). As for functional RNAs that ultimately act protein-independently (e.g., peptide-bond formation by ribosomal RNA, mRNA splicing by spliceosomal RNA), these transcripts still require associated proteins for their proper folding, processing, modification, stabilization, and localization. Because so many cellular RNA-protein interactions still remain unknown, it is advantageous to pursue their discovery using high-throughput approaches. The advent and continual improvement of high-throughput DNA-sequencing technology has led to the development of many powerful techniques, such as RIP-seq and CLIP-seq, which can be used to identify the full repertoire of RNAs bound by a protein of interest. However, protocols exist for identifying the proteins bound to a particular RNA. Most available techniques involve RNA pull-down followed by protein identification via mass spectrometry, which requires highly specific, robust biochemical enrichment and is prone to non-biological associations of molecules that can occur between the steps of cell lysis and affinity purification. New techniques for identifying nucleic acid-binding proteins are needed to identify novel biological processes and targets for drug development.
To address the relative dearth of techniques for identifying binding partners for a given RNA, the inventors have developed a novel technique: CRISPR-assisted RNA/RBP yeast (CARRY) two-hybrid (
One embodiment of the present invention is a CRISPR-assisted RNA/RBP yeast (CARRY) two-hybrid system. This system comprises a yeast cell comprising a genomic bacterial dCas9 gene expressing a dCas9 protein, or functional part thereof; a genomic first reporter gene comprising a first upstream CRISPR sgRNA-binding region; and a genomic second reporter gene comprising a second upstream CRISPR sgRNA binding region. The yeast cell also comprises exogenous DNA sequences comprising a first nucleic acid sequence expressing a noncoding CRISPR sgRNA, and a second nucleic acid sequence comprising a cloning site for the insertion of a test sequence. The second nucleic acid may comprise a test sequence. The CARRY two-hybrid system exogenous DNA sequences may further comprises a third nucleic acid sequence expressing a Gal4 activation domain (GAD) or functional part thereof and one or more vectors may comprise the exogenous DNA sequences. The first, second and third nucleic acid sequences may be connected in order beginning with the first nucleic acid sequence and ending with the third nucleic acid sequence (if present). In some embodiments of the present invention the vector is a plasmid comprising all of the exogenous DNA sequences. Any suitable plasmid may be used such as a high-copy plasmid including a MS2 plasmid, for example. The first nucleic acid sequence of a CARRY two-hybrid system of the present invention may expresses a hybrid CRISPR sgRNA from an RNA polymerase II promoter. In some embodiments of the present invention the RNA polymerase II promoter is flanked by a hammerhead ribozyme and a HDV ribozyme and/or the 5′ end of the sgRNA targets RNA to one or more LexA-binding sites upstream of the first reporter gene and the second reporter gene. In some embodiments of the present invention the cloning site is adjacent to the 3′ end of the sgRNA. The cloning site of the present invention comprises one or more suitable restriction enzyme sites and may be located in suitable locations on a vector. In some embodiments of the present invention the cloning site is located four nucleotides from a 5′ end of the hepatitis delta virus (HDV) ribozyme cleavage site. In some embodiments a CARRY two-hybrid system of claim 1 may include any suitable reporter genes including a HIS3, LacZ or both, as examples
Another embodiment of the present invention is a method of identifying an RNA-binding protein, an RNA binding site, or a combination. The method includes providing exogenous DNA sequences comprising a first nucleic acid sequence expressing a noncoding RNA fused to the CRISPR sgRNA, a second nucleic acid sequence comprising a variable a RNA X cloning site, and a third nucleic acid sequence expressing a Gal4 activation protein domain (GAD). A test nucleic acid sequence is cloned into the RNA X cloning site to allow expression of a variable RNA X. A yeast cell is provided comprising a genomic bacterial dCas9 gene expressing a dCas9 protein, or functional part thereof; a first reporter gene comprising a first upstream sgRNA-binding region; and a second reporter gene comprising a second upstream sgRNA binding region, wherein the first and second reporter genes do not express a first reporter protein or second reporter protein, or functional parts thereof, until an RNA binding protein binds to the test sequence. The yeast cell is transformed with the exogenous DNA sequences comprising the inserted test nucleic acid sequence forming a transformed yeast. The transformed yeast is incubated to allow for expression of the first reporter protein, the second reporter protein, or a combination thereof should an RNA binding protein bind to the test nucleic acid sequence of the variable RNA X. An RNA binding protein, RNA binding site, or a combination thereof are identified when there is expression of the first, second or both reporter genes indicating the RNA binding protein is bound to the test sequence of the variable RNA X. Any suitable reporter gene may be used in the present such as a first reporter gene being HIS3 gene and the second reporter gene being the LacZ gene, as examples. In some embodiments of the present invention, the noncoding sgRNA is covalently connected to the test sequence; the test sequence is noncovalently connected with the RNA binding protein, and the RNA binding protein is covalently connected to the GAD protein resulting in the expression of the first and/or second reporter genes. In some embodiments of the present invention, the RNA-binding site is identified by repeatedly performing the method steps further comprising exogenous sequences expressing smaller pieces of the RNA-binding protein bound to the test sequence to narrow down the interacting portion of the RNA binding protein.
Another embodiment of the present invention is a method of identifying an RNA or portion thereof that affects reporter-gene transcription. Exogenous DNA sequences are provided comprising a first nucleic acid sequence expressing a noncoding RNA fused to the CRISPR sgRNA, and a second nucleic acid sequence comprising a variable RNA X multiple-cloning site. A test nucleic acid sequence is inserted into the RNA X cloning site to allow expression of a variable RNA X. A yeast cell is provided comprising a genomic bacterial dCas9 gene expressing a dCas9 protein, or functional part thereof; a genomic first reporter gene comprising a first upstream sgRNA-binding region; and a genomic second reporter gene comprising a second upstream sgRNA binding region, wherein the first and second reporter genes do not express a first reporter protein or second reporter protein, or functional parts thereof, until an RNA is fused to sgRNA that induces reporter gene expression. The yeast cell is transformed with the exogenous DNA sequences comprising the inserted test nucleic acid sequence forming a transformed yeast. The transformed yeast is incubated to allow expression of the first reporter protein, the second reporter protein, or a combination thereof should an RNA binds to sgRNA activating the first, second, or both reporter genes; and identifying a transcription-activating test nucleic acid sequences when there is expression of the first, second or both reporters.
Unless defined otherwise, all technical and scientific terms used herein have the meaning commonly understood by a person skilled in the art to which this invention belongs. The following references provide one of skill with a general definition of many of the terms used in this invention: Singleton et al., Dictionary of Microbiology and Molecular Biology (2nd ed. 1994); The Cambridge Dictionary of Science and Technology (Walker ed., 1988); The Glossary of Genetics, 5th Ed., R. Rieger et al. (eds.), Springer Verlag (1991); and Hale & Marham, The Harper Collins Dictionary of Biology (1991). As used herein, the following terms have the meanings ascribed to them below, unless specified otherwise.
The term “activity” refers to the ability of a gene to perform its function, such as HIS3 encoding a protein Imidazoleglycerol-phosphate dehydratase which catalyzes the sixth step in histidine biosynthesis.
By “alteration” is meant a change (increase or decrease) in the expression levels or activity of a gene or polypeptide. As used herein, an alteration includes a 10% change in expression levels, preferably a 25% change, more preferably a 40% change, and most preferably a 50% or greater change in expression levels.
The term “express” refers to transcription by RNA polymerase (and possibly also translation by the ribosome) of a gene, including, for example, its corresponding mRNA or protein sequence(s).
The term, “high-copy plasmid” refers to a plasmid comprising a 2-micron replication and partitioning DNA sequence.
“Hybridization” means non-covalent bonding, which may be Watson-Crick, Hoogsteen or reversed Hoogsteen hydrogen bonding between complementary DNA and/or RNA nucleobases. For example, adenine and thymine are complementary nucleobases that pair through the formation of hydrogen bonds. By “hybridize” is meant pair to form a double-stranded molecule between complementary polynucleotide sequences (e.g., a gene described herein), or portions thereof, under various conditions of stringency. (See, e.g., Wahl, G. M. and S. L. Berger (1987) Methods Enzymol. 152:399; Kimmel, A. R. (1987) Methods Enzymol. 152:507).
The term “low-copy plasmid” refers to a plasmid containing a yeast centromeric sequence.
The term, “obtaining” as in “obtaining an agent” includes synthesizing, purchasing, or otherwise acquiring the agent.
By “reduces” is meant a negative alteration of at least 10%, 25%, 50%, 75%, or 100%.
By “specifically binds” is meant a compound, antibody, or nucleic acid that recognizes and binds a nucleic acid of the invention, but which does not substantially recognize and bind other molecules in a sample.
As used herein, the term “subject” is intended to refer to any individual or patient to which the method described herein is performed. Generally the subject is yeast or human, although as will be appreciated by those in the art, the subject may be an animal. Thus other animals, including mammals such as rodents (including mice, rats, hamsters and guinea pigs), cats, dogs, rabbits, farm animals including cows, horses, goats, sheep, pigs, etc., and primates (including monkeys, chimpanzees, orangutans and gorillas) are included within the definition of subject.
Nucleic acid molecules useful in the methods of the invention include noncoding RNA as well as any nucleic acid molecule that encodes a polypeptide of the invention or a fragment thereof. Such nucleic acid molecules need not be 100% identical with an endogenous nucleic-acid sequence but will typically exhibit substantial identity. Polynucleotides having “substantial identity” to an endogenous sequence are typically capable of hybridizing with at least one strand of a double-stranded nucleic acid molecule.
By “substantially identical” is meant a polypeptide or nucleic acid molecule exhibiting at least 50% identity to a reference amino acid sequence (for example, any one of the amino acid sequences described herein) or nucleic acid sequence (for example, any one of the nucleic acid sequences described herein). Preferably, such a sequence is at least 60%, more preferably 80% or 85%, and more preferably 90%, 95% or even 99% identical at the amino acid level or nucleic acid to the sequence used for comparison.
Sequence identity is typically measured using sequence analysis software (for example, Sequence Analysis Software Package of the Genetics Computer Group, University of Wisconsin Biotechnology Center, 1710 University Avenue, Madison, Wis. 53705, BLAST, BESTFIT, GAP, or PILEUP/PRETTYBOX programs). Such software matches identical or similar sequences by assigning degrees of homology to various substitutions, deletions, and/or other modifications. Conservative substitutions typically include substitutions within the following groups: glycine, alanine; valine, isoleucine, leucine; aspartic acid, glutamic acid, asparagine, glutamine; serine, threonine; lysine, arginine; and phenylalanine, tyrosine. In an exemplary approach to determining the degree of identity, a BLAST program may be used, with a probability score between e−3 and e−100 indicating a closely related sequence.
Ranges provided herein are understood to be shorthand for all of the values within the range. For example, a range of 1 to 50 is understood to include any number, combination of numbers, or sub-range from the group consisting 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, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50.
Unless specifically stated or obvious from context, as used herein, the term “or” is understood to be inclusive. Unless specifically stated or obvious from context, as used herein, the terms “a”, “an”, and “the” are understood to be singular or plural.
Unless specifically stated or obvious from context, as used herein, the term “about” is understood as within a range of normal tolerance in the art, for example within 2 standard deviations of the mean. About can be understood as within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless otherwise clear from context, all numerical values provided herein are modified by the term about.
Any compositions or methods provided herein can be combined with one or more of any of the other compositions and methods provided herein.
In an effort to address the relative dearth of techniques for identifying binding partners for a given RNA, the inventors have developed a novel technique: CRISPR-assisted RNA/RBP yeast (CARRY) two-hybrid (
The inventors have shown that the yeast two-hybrid reporter genes are activated contingent on binding between a sgRNA-fused RNA and GAD-fused protein. Furthermore, the inventors' CARRY two-hybrid assay is specific, and their tests also show that it is sufficiently sensitive to detect RNA-protein interactions with up to—and potentially including—micromolar dissociation constants. The inventors expect that CARRY two-hybrid will prove to be a useful tool for both the identification and characterization of RNA-protein interactions.
The inventors constructed the yeast strain used for CARRY two-hybrid, “CARRYeast-1a,” by integrating a dCas9 expression cassette in the genome of a previously published yeast two-hybrid strain, L40, which contains the reporter genes HIS3 and LacZ with 4 or 8 LexA binding sites inserted in their promoters, respectively. While several adaptations of the CRISPR/Cas9 system for use in S. cerevisiae express the sgRNA from an RNA polymerase III promoter, the inventors chose to express the hybrid sgRNA for CARRY two-hybrid using an RNA polymerase II promoter (
In order to express the hybrid sgRNA, the inventors modified a previously published RNA polymerase II sgRNA expression construct (
The inventors first sought to test the CARRY two-hybrid system with a well-understood RNA-protein interaction, such as the MS2 bacteriophage's RNA binding to coat protein (MCP). The inventors cloned the MS2 RNA hairpin mutant, U-5C—which binds the MS2 coat protein more tightly than the wild-type hairpin—into the sgRNA expression vector, and the inventors also cloned a tandem dimer of the MS2 coat protein (MCP2) into pGAD424, which is a standard vector for expression of Ga14-activating domain (GAD) fusion proteins in the yeast two-hybrid system. These plasmids were then transformed into CARRYeast, and expression of HIS3 and LacZ were assessed by growth of cells on media lacking histidine and by a colorimetric assay, respectively. When both the sgRNA-U-5C MS2 hybrid RNA and the GAD-MCP2 hybrid protein were expressed, expression of both HIS3 and LacZ was strongly induced (
Next, to test the sensitivity of the CARRY two-hybrid system, the inventors replaced the U-5C MS2 hairpin with the wild-type MS2 hairpin and several biochemically characterized mutants of the MS2 hairpin with reduced binding affinity for the MS2 coat protein (
To test if the inventors could increase the sensitivity of the CARRY two-hybrid system, the inventors subcloned the sgRNA expression cassette from a single-copy centromeric plasmid to a high-copy 2μ (or 2-micron) plasmid and re-tested activation for several of the MS2 hairpin mutants. Although expression of the hybrid sgRNA from the high-copy plasmid could not increase the already-maximal HIS3 activation for the U-5C or AU helix mutant MS2 hairpins (
The inventors have developed a new assay for investigating RNA-protein interactions, “CARRY two-hybrid,” that combines CRISPR/dCas9-mediated targeting of RNA to a specific DNA sequence with the highly effective yeast two-hybrid protein-protein interaction assay. As evidenced by tests the inventors performed using CARRY two-hybrid to analyze bacteriophage MS2 hairpin binding to MS2 coat protein, this new assay can detect RNA-protein interactions in vivo with high specificity (i.e., virtually no background signal for the HIS3 reporter gene) and can detect interactions with near-micromolar dissociation constants in vitro.
Given the simplicity of the CARRY two-hybrid system and the ease with which it has functioned in the inventors' hands thus far, the inventors expect that it will prove to be a highly effective method for dissecting known RNA-protein interfaces, as well as for the discovery of new RNA-protein interactions. The inventors have constructed a vector with a multiple-cloning site to facilitate fusing an RNA of interest to the sgRNA (see
CARRY two-hybrid is similar to the yeast “three-hybrid” system in the sense the three-hybrid method also assays for RNA-protein interactions by building upon the basic principles underlying the original yeast two-hybrid assay. The three-hybrid system, published over 15 years ago, employs a well-characterized, high-affinity RNA-protein interaction (either MS2-MCP or RRE-RevM10 from HIV) to tether RNAs of interest to reporter-gene promoters by way of fusing them to the characterized MS2 RNA, while also appending the characterized RNA-binding protein to a specific DNA-binding protein domain; thus, there is a total of three hybrid molecules. However, there has been limited success using the three-hybrid system, as evidenced by the relative paucity of publications referencing use of three-hybrid. Although the inventors have yet to directly compare the capabilities of CARRY two-hybrid with those of yeast three-hybrid, the inventors anticipate that CARRY two-hybrid is likely to prove even more useful. The recruitment of the Gal4 activating domain to the reporter genes in yeast three-hybrid necessitates three different binding interactions (e.g., DNA LexA sites⋅LexADBD-MCP⋅MS2 RNA-X⋅Y-GAD). In contrast, the CARRY two-hybrid system uses CRISPR/dCas9 to directly target RNA to DNA. By reducing the number of stable binding events required for activating reporter genes to two, as well as other features that promote efficiency and robustness described above, the CARRY two-hybrid is likely to be more effective at detecting RNA-protein interactions.
The inventors also expect that, given the advantageously low background of HIS3 reporter gene expression in the absence of an interaction between RNA “X” (a test nucleic acid sequence fused to sgRNA) and protein “Y” (fused to GAD), the CARRY two-hybrid system will allow forward-genetic selection to discover novel proteins that interact with an RNA “X” (i.e., test nucleic sequence) of interest. Using CARRY two-hybrid, one should be able to introduce into yeast an RNA “X” (i.e. a test nucleic acid sequence) of interest along with a GAD-hybrid “library,” containing fragments of yeast/human/other genomic DNA or cDNA and then select from the library GAD-hybrid proteins that bind to the RNA, by way of HIS3 reporter-gene activation and recovery and DNA sequencing of the causative GAD-hybrid expressing library plasmid, similar to what is performed in the standard protein-protein yeast two-hybrid protocol. Further evidence of this important claim of the invention is that
Other applications of the compositions and methods of the present invention will include:
The following Examples/Methods have been included to provide guidance to one of ordinary skill in the art for practicing representative embodiments of the presently disclosed subject matter. In light of the present disclosure and the general level of skill in the art, those of skill can appreciate that the following Examples/Methods are intended to be exemplary only and that numerous changes, modifications, and alterations can be employed without departing from the scope of the presently disclosed subject matter. The following Examples/Methods are offered by way of illustration and not by way of limitation.
CARRYeast-1a was generated by modifying the yeast two-hybrid strain L40 (MATa his3Δ200 trp1-901 leu2-3,112 ade2 LYS2:: (4LexAop-HIS3) URA3::(8LexAop-LacZ)) (Hollenberg et al., Molecular and Cellular Biology 1995). First, yeast cells were transformed with linearized pJZC518 containing a cassette for expression of S. pyogenes dCas9 in S. cerevisiae, C. glabrata LEU2 selectable marker, and homology arms for integration at the S. cerevisiae LEU2 locus. In the resulting yeast strain, the C. glabrata LEU2 selectable marker was knocked back out using a cassette generated using pFA6a-KanMX6 CARRYeast-1b was created by mating CARRYeast-1a with the yeast two-hybrid strain AMR70 (MATαhis3Δ200 lys2-801am trp1-901 leu2-3,112 URA3:: (8LexAop-LacZ)) (Hollenberg et al., Molecular and Cellular Biology 1995), sporulating the resulting diploid strain, and then selecting for a MATα spore that was both LYS+, indicating presence of the LexAop-HIS3 cassette from CARRYeast-1a, and resistant to the drug G418, indicating presence of the dCas9 expression cassette from CARRYeast-1a.
The sgRNA expression vectors, pCARRY1 and pCARRY2, were based on pJZC625. This plasmid contains a ribozyme-guide RNA-ribozyme (RGR) cassette. The sgRNA in pJZC625 contained a guide sequence targeted to the TET operator and a U-5C MS2 hairpin inserted 4 nucleotides before the HDV ribozyme cut site. The RGR cassette is flanked by the S. cerevisiae ADH1 promoter and the C. albicans ADH1 terminator. To generate pCARRY1, pJZC625 was digested with ApaI and Bg1II, and the full expression cassette was cloned into pRS414 that had been digested with ApaI and BamHI. Second, the guide sequence of the sgRNA was changed to target the LexA operator sequence ACTGCTGTATATAAAACCAG (SEQ ID NO: 1), which is followed by a PAM with sequence TGG in the LexA operators present in CARRYeast. Additionally, in order to maintain base-pairing in the H1 stem of the hammerhead ribozyme of the RGR cassette (the 3′ half of which consists of the first 6 nucleotides of the sgRNA guide sequence), the sequence of the 5′ half of the H1 stem was changed to AGCAGT. Third, the MS2 hairpin was replaced with GGATCCCATGGGTCGACCCCGGGAATTC (SEQ ID NO: 2), an earlier-designed version of the hairpin-forming multiple cloning site sequence (MCSv0.5). This sequence was later replaced with the MCS sequence shown in
The vector used to express the GAD-MCP2 fusion protein, pDZ982, was cloned using pGAD424. DNA encoding a tandem MCP dimer and an N-terminal linker (i.e., ultimately between GAD and MCP2 in the final plasmid) with amino-acid sequence GGGR was PCR amplified from the plasmid pDZ349 and cloned into pGAD424 using XmaI and PstI. Both MCP monomers contain the N55K mutation, reported to strengthen binding to the MS2 hairpin ˜10-fold, while the first monomer also contains the incidental mutations K57R and 1104V.
Expression of the HIS3 reporter gene in CARRYeast was assayed by first growing yeast in liquid culture (using minimal media lacking tryptophan and leucine) to saturation overnight. 100-μL aliquots were taken from these cultures and used to make six 10-fold serial dilutions of the culture. 5μL of the undiluted aliquot and of each serial dilution were spotted to both solid -Trp-Leu and -Trp-Leu-His minimal media. These spotted cells were then incubated for two days at 30° C. and photographed.
Colorimetric LacZ reporter gene expression assays were performed as described previously. Briefly, expression of the LacZ reporter gene in CARRYeast was assayed by first streaking the cells as patches on -Trp-Leu medium and incubating the cells for ˜15-24 hours at 30° C. Yeast were then removed from the agar plate by laying a circle of nitrocellulose filter down onto the agar, patting it down firmly, and peeling them off. Yeast attached to the nitrocellulose filter were lysed by briefly submerging the filter in liquid nitrogen. Then, in a petri dish, a piece of Whatman filter paper was wetted with 1.8 mL of 100 mM sodium phosphate buffer pH 7.0 with 10 mM KCl, 1 mM MgSO4, and 333 μg/mL X-gal. The nitrocellulose filter was soaked in the X-gal solution by laying it on top of the Whatman paper, and the petri dish was incubated at 30° C. The color of the lysed yeast cells was monitored and photographed at time intervals over ˜24 hours or until the dish had dried out and stopped the reaction.
All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
This application claims the benefit of U.S. Provisional Patent application 62/489,538, filed 25 Apr. 2017, which are hereby incorporated by reference for all purposes as if fully set forth herein.
This invention was made with government support under grant no. R01 GM118757 awarded by the National Institutes of Health. The government has certain rights in the invention.
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/US2018/029329 | 4/25/2018 | WO | 00 |
Number | Date | Country | |
---|---|---|---|
62489538 | Apr 2017 | US |