US20150284727A1 - Composition for cleaving a target dna comprising a guide rna specific for the target dna and cas protein-encoding nucleic acid or cas protein, and use thereof - Google Patents

Composition for cleaving a target dna comprising a guide rna specific for the target dna and cas protein-encoding nucleic acid or cas protein, and use thereof Download PDF

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US20150284727A1
US20150284727A1 US14/438,098 US201314438098A US2015284727A1 US 20150284727 A1 US20150284727 A1 US 20150284727A1 US 201314438098 A US201314438098 A US 201314438098A US 2015284727 A1 US2015284727 A1 US 2015284727A1
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guide rna
composition
cas protein
dna
cas9
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Jin-soo Kim
Seung Woo Cho
Sojung Kim
Jong Min Kim
Seokjoong Kim
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Toolgen Inc
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Definitions

  • the present invention relates to targeted genome editing in eukaryotic cells or organisms. More particularly, the present invention relates to a composition for cleaving a target DNA in eukaryotic cells or organisms comprising a guide RNA specific for the target DNA and Cas protein-encoding nucleic acid or Cas protein, and use thereof.
  • CRISPRs are loci containing multiple short direct repeats that are found in the genomes of approximately 40% of sequenced bacteria and 90% of sequenced archaea.
  • CRISPR functions as a prokaryotic immune system, in that it confers resistance to exogenous genetic elements such as plasmids and phages.
  • the CRISPR system provides a form of acquired immunity. Short segments of foreign DNA, called spacers, are incorporated into the genome between CRISPR repeats, and serve as a memory of past exposures. CRISPR spacers are then used to recognize and silence exogenous genetic elements in a manner analogous to RNAi in eukaryotic organisms.
  • Cas9 an essential protein component in the Type II CRISPR/Cas system, forms an active endonuclease when complexed with two RNAs termed CRISPR RNA (crRNA) and trans-activating crRNA (tracrRNA), thereby slicing foreign genetic elements in invading phages or plasmids to protect the host cells.
  • crRNA is transcribed from the CRISPR element in the host genome, which was previously captured from such foreign invaders.
  • Jinek et al. (1) demonstrated that a single-chain chimeric RNA produced by fusing an essential portion of crRNA and tracrRNA could replace the two RNAs in the Cas9/RNA complex to form a functional endonuclease.
  • CRISPR/Cas systems offer an advantage to zinc finger and transcription activator-like effector DNA-binding proteins, as the site specificity in nucleotide binding CRISPR-Cas proteins is governed by a RNA molecule instead of the DNA-binding protein, which can be more challenging to design and synthesize.
  • RFLP Restriction fragment length polymorphism
  • Engineered nuclease-induced mutations are detected by various methods, which include mismatch-sensitive T7 endonuclease I (T7E1) or Surveyor nuclease assays, RFLP, capillary electrophoresis of fluorescent PCR products, Dideoxy sequencing, and deep sequencing.
  • T7E1 and Surveyor assays are widely used but are cumbersome.
  • theses enzymes tend to underestimate mutation frequencies because mutant sequences can form homoduplexes with each other and cannot distinguish homozygous bi-allelic mutant clones from wildtype cells.
  • RFLP is free of these limitations and therefore is a method of choice. Indeed, RFLP was one of the first methods to detect engineered nuclease-mediated mutations in cells and animals. Unfortunately, however, RFLP is limited by the availability of appropriate restriction sites. It is possible that no restriction sites are available at the target site of interest.
  • the present inventors have made many efforts to develop a genome editing method based on CRISPR/Cas system and finally established a programmable RNA-guided endonuclease that cleave DNA in a targeted manner in eukaryotic cells and organisms.
  • RGENs RNA-guided endonucleases
  • It is still another object of the present invention to provide a kit for cleaving a target DNA in eukaryotic cells or organisms comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • It is still another object of the present invention to provide a kit for inducing targeted mutagenesis in eukaryotic cells or organisms comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • It is still another object of the present invention to provide a method for cleaving a target DNA in eukaryotic cells or organisms comprising a step of transfecting the eukaryotic cells or organisms comprising a target DNA with a composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • It is still another object of the present invention to provide a method for inducing targeted mutagenesis in a eukaryotic cell or organism comprising a step of treating a eukaryotic cell or organism with a composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • It is still another object of the present invention to provide a method of preparing a genome-modified animal comprising a step of introducing the composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein into an embryo of an animal; and a step of transferring the embryo into a oviduct of pseudopregnant foster mother to produce a genome-modified animal.
  • RNA-guided endonuclease RGEN
  • the RGEN comprises a guide RNA specific for target DNA and Cas protein.
  • RGEN RNA-guided endonuclease
  • It is still another object of the present invention to provide a kit for cleaving a target DNA in eukaryotic cells or organisms comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • It is still another object of the present invention to provide a kit for inducing targeted mutagenesis in eukaryotic cells or organisms comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • It is still another object of the present invention to provide a method for cleaving a target DNA in eukaryotic cells or organisms comprising a step of transfecting the eukaryotic cells or organisms comprising a target DNA with a composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • It is still another object of the present invention to provide a method for inducing targeted mutagenesis in a eukaryotic cell or organism comprising a step of treating a eukaryotic cell or organism with a composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • It is still another object of the present invention to provide a method of preparing a genome-modified animal comprising a step of introducing the composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein into an embryo of an animal; and a step of transferring the embryo into a oviduct of pseudopregnant foster mother to produce a genome-modified animal.
  • RGEN RNA-guided endonuclease
  • RGEN RNA-guided endonuclease
  • the present composition for cleaving a target DNA or inducing a targeted mutagenesis in eukaryotic cells or organisms comprising a guide RNA specific for the target DNA and Cas protein-encoding nucleic acid or Cas protein, the kit comprising the composition, and the method for inducing targeted mutagenesis provide a new convenient genome editing tools.
  • custom RGENs can be designed to target any DNA sequence, almost any single nucleotide polymorphism or small insertion/deletion (indel) can be analyzed via RGEN-mediated RFLP, therefore, the composition and method of the present invention may be used in detection and cleaving naturally-occurring variations and mutations.
  • FIG. 1 shows Cas9-catalyzed cleavage of plasmid DNA in vitro.
  • FIG. 2 shows Cas9-induced mutagenesis at an episomal target site.
  • (b) Flow cytometry of cells transfected with Cas9. The percentage of cells that express the RFP-GFP fusion protein is indicated.
  • FIG. 3 shows RGEN-driven mutations at endogenous chromosomal sites.
  • FIG. 4 shows that RGEN-driven off-target mutations are undetectable.
  • On-target and potential off-target sequences The human genome was searched in silico for potential off-target sites. Four sites were identified, each of which carries 3-base mismatches with the CCR5 on-target site. Mismatched bases are underlined.
  • the T7E1 assay was used to investigate whether these sites were mutated in cells transfected with the Cas9/RNA complex. No mutations were detected at these sites. N/A (not applicable), an intergenic site.
  • Cas9 did not induce off-target-associated chromosomal deletions. The CCR5-specific RGEN and ZFN were expressed in human cells. PCR was used to detect the induction of the 15-kb chromosomal deletions in these cells.
  • FIG. 5 shows RGEN-induced Foxn1 gene targeting in mice.
  • (a) A schematic diagram depicting a sgRNA specific to exon 2 of the mouse Foxn1 gene. PAM in exon 2 is shown in red and the sequence in the sgRNA that is complementary to exon 2 is underlined. Triangles indicate cleavage sites.
  • (b) Representative T7E1 assays demonstrating gene-targeting efficiencies of Cas9 mRNA plus Foxn1-specific sgRNA that were delivered via intra-cytoplasmic injection into one-cell stage mouse embryos. Numbers indicate independent founder mice generated from the highest dose. Arrows indicate bands cleaved by T7E1.
  • (c) DNA sequences of mutant alleles observed in three Foxn1 mutant founders identified in b.
  • FIG. 6 shows Foxn1 gene targeting in mouse embryos by intra-cytoplasmic injection of Cas9 mRNA and Foxn1-sgRNA.
  • FIG. 7 shows Foxn1 gene targeting in mouse embryos using the recombinant Cas9 protein: Foxn1-sgRNA complex.
  • (a) and (b) are representative T7E1 assays results and their summaries. Embryos were cultivated in vitro after they underwent pronuclear (a) or intra-cytoplasmic injection (b). Numbers in red indicate T7E1-positive mutant founder mice.
  • FIG. 8 shows Germ-line transmission of the mutant alleles found in Foxn1 mutant founder #12.
  • FIG. 9 shows Genotypes of embryos generated by crossing Prkdc mutant founders. Prkdc mutant founders ⁇ 25 and ⁇ 15 were crossed and E13.5 embryos were isolated.
  • FIG. 10 shows Cas9 protein/sgRNA complex induced targeted mutation.
  • FIG. 11 shows recombinant Cas9 protein-induced mutations in Arabidopsis protoplasts.
  • FIG. 12 shows recombinant Cas9 protein-induced mutant sequences in the Arabidopsis BRI1 gene.
  • FIG. 13 shows T7E1 assay showing endogenous CCR5 gene disruption in 293 cells by treatment of Cas9-mal-9R4L and sgRNA/C9R4LC complex.
  • FIG. 14 ( a, b ) shows mutation frequencies at on-target and off-target sites of RGENs reported in Fu et al. (2013).
  • T7E1 assays analyzing genomic DNA from K562 cells (R) transfected serially with 20 ⁇ g of Cas9-encoding plasmid and with 60 ⁇ g and 120 ⁇ g of in vitro transcribed GX19 crRNA and tracrRNA, respectively (1 ⁇ 10 6 cells), or (D) co-transfected with 1 ⁇ g of Cas9-encoding plasmid and 1 ⁇ g of GX 19 sgRNA expression plasmid (2 ⁇ 10 5 cells).
  • FIG. 15 ( a, b ) shows comparison of guide RNA structure. Mutation frequencies of the RGENs reported in Fu et al. (2013) were measured at on-target and off-target sites using the T7E1 assay. K562 cells were co-transfected with the Cas9-encoding plasmid and the plasmid encoding GX19 sgRNA or GGX20 sgRNA. Off-target sites (OT1-3 etc.) are labeled as in Fu et al. (2013).
  • FIG. 16 shows that in vitro DNA cleavage by Cas9 nickases.
  • (a) Schematic overview of the Cas9 nuclease and the paired Cas9 nickase. The PAM sequences and cleavage sites are shown in box.
  • (c) Schematic overview of DNA cleavage reactions. FAM dyes (shown in box) were linked to both 5′ ends of the DNA substrate.
  • DSBs and SSBs analyzed using fluorescent capillary eletrophoresis. Fluorescentlylabeled DNA substrates were incubated with Cas9 nucleases or nickases before electrophoresis.
  • FIG. 17 shows comparison of Cas9 nuclease and nickase behavior.
  • FIG. 18 shows paired Cas9 nickases tested at other endogenous human loci.
  • (a,c) The sgRNA target sites at human CCR5 and BRCA2 loci. PAM sequences are indicated in red.
  • (b,d) Genome editing activities at each target site were detected by the T7E1 assay. The repair of two nicks that would produce 5′ overhangs led to the formation of indels much more frequently than did those producing 3′ overhangs.
  • FIG. 19 shows that paired Cas9 nickases mediate homologous recombination.
  • FIG. 20 shows DNA splicing induced by paired Cas9 nickases.
  • FIG. 21 shows that paired Cas9 nickases do not induce translocations.
  • FIG. 22 shows a conceptual diagram of the T7E1 and RFLP assays.
  • FIG. 23 shows in vitro cleavage assay of a linearized plasmid containing the C4BPB target site bearing indels.
  • DNA sequences of individual plasmid substrates (upper panel).
  • the PAM sequence is underlined. Inserted bases are shown in box.
  • Arrows (bottom panel) indicate expected positions of DNA bands cleaved by the wild-type-specific RGEN after electrophoresis.
  • FIG. 24 shows genotyping of mutations induced by engineered nucleases in cells via RGEN-mediated RFLP.
  • FIG. 25 shows genotyping of RGEN-induced mutations via the RGEN-RFLP technique.
  • FIG. 26 shows genotyping of mutations induced by engineered nucleases in organisms via RGEN-mediated RFLP.
  • FIG. 27 shows RGEN-mediated genotyping of ZFN-induced mutations.
  • the ZFN target site is shown in box.
  • Black arrows indicate DNA bands cleaved by T7E1.
  • FIG. 28 shows polymorphic sites in a region of the human HLA-B gene.
  • the sequence, which surrounds the RGEN target site, is that of a PCR amplicon from HeLa cells. Polymorphic positions are shown in box.
  • the RGEN target site and the PAM sequence are shown in dashed and bolded box, respectively. Primer sequences are underlined.
  • FIG. 29 shows genotyping of oncogenic mutations via RGEN-RFLP analysis.
  • a recurrent mutation c.133-135 deletion of TCT
  • HCT116 cells was detected by RGENs.
  • HeLa cells were used as a negative control.
  • Genotyping of the KRAS substitution mutation c.34 G>A
  • Mismatched nucleotides are shown in box.
  • HeLa cells were used as a negative control.
  • Arrows indicate DNA bands cleaved by RGENs. DNA sequences confirmed by Sanger sequencing are shown.
  • FIG. 30 shows genotyping of the CCR5 delta32 allele in HEK293T cells via RGEN-RFLP analysis.
  • FIG. 31 shows genotyping of a KRAS point mutation (c.34 G>A).
  • Plasmids harboring either the wild-type or mutant KRAS sequences were digested using RGENs with perfectly matched crRNAs or attenuated, one-base mismatched crRNAs. Attenuated crRNAs that were chosen for genotyping are labeled in box above the gels.
  • FIG. 32 shows genotyping of a PIK3CA point mutation (c.3140 A>G).
  • Plasmids harboring either the wild-type or mutant PIK3CA sequences were digested using RGENs with perfectly matched crRNAs or attenuated, one-base mismatched crRNAs. Attenuated crRNAs that were chosen for genotyping are labeled in box above the gels.
  • FIG. 33 shows genotyping of recurrent point mutations in cancer cell lines.
  • Genotypes of each cell line confirmed by Sanger sequencing are shown. Mismatched nucleotides are shown in box. Black arrows indicate DNA bands cleaved by RGENs.
  • the present invention provides a composition for cleaving target DNA in eukaryotic cells or organisms comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • the present invention provides a use of the composition for cleaving target DNA in eukaryotic cells or organisms comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • the composition is also referred to as a RNA-guided endonuclease (RGEN) composition.
  • RGEN RNA-guided endonuclease
  • ZFNs and TALENs enable targeted mutagenesis in mammalian cells, model organisms, plants, and livestock, but the mutation frequencies obtained with individual nucleases are widely different from each other. Furthermore, some ZFNs and TALENs fail to show any genome editing activities. DNA methylation may limit the binding of these engineered nucleases to target sites. In addition, it is technically challenging and time-consuming to make customized nucleases.
  • the present inventors have developed a new RNA-guided endonuclease composition based on Cas protein to overcome the disadvantages of ZFNs and TALENs.
  • an endonuclease activity of Cas proteins has been known. However, it has not been known whether the endonuclease activity of Cas protein would function in an eukaryotic cell because of the complexity of the eukaryotic genome. Further, until now, a composition comprising Cas protein or Cas protein-encoding nucleic acid and a guide RNA specific for the target DNA to cleave a target DNA in eukaryotic cells or organisms has not been developed.
  • the present RGEN composition based on Cas protein can be more readily customized because only the synthetic guide RNA component is replaced to make a new genome-editing nuclease. No sub-cloning steps are involved to make customized RNA guided endonucleases.
  • the relatively small size of the Cas gene for example, 4.2 kbp for Cas9 as compared to a pair of TALEN genes ( ⁇ 6 kbp) provides an advantage for this RNA-guided endonuclease composition in some applications such as virus-mediated gene delivery. Further, this RNA-guided endonuclease does not have off-target effects and thus does not induce unwanted mutations, deletion, inversions, and duplications.
  • RNA-guided endonuclease composition a scalable, versatile, and convenient tools for genome engineering in eukaryotic cells and organisms.
  • RGEN can be designed to target any DNA sequence, almost any single nucleotide polymorphism or small insertion/deletion (indel) can be analyzed via RGEN-mediated RFLP.
  • the specificity of RGENs is determined by the RNA component that hybridizes with a target DNA sequence of up to 20 base pairs (bp) in length and by the Cas9 protein that recognize the protospacer-adjacent motif (PAM).
  • PAM protospacer-adjacent motif
  • RGENs are readily reprogrammed by replacing the RNA component. Therefore, RGENs provide a platform to use simple and robust RFLP analysis for various sequence variations.
  • the target DNA may be an endogenous DNA, or artificial DNA, preferably, endogenous DNA.
  • Cas protein refers to an essential protein component in the CRISPR/Cas system, forms an active endonuclease or nickase when complexed with two RNAs termed CRISPR RNA (crRNA) and trans-activating crRNA (tracrRNA).
  • crRNA CRISPR RNA
  • tracrRNA trans-activating crRNA
  • the information on the gene and protein of Cas are available from GenBank of National Center for Biotechnology Information (NCBI), without limitation.
  • CRISPR-associated (cas) genes encoding Cas proteins are often associated with CRISPR repeat-spacer arrays. More than forty different Cas protein families have been described. Of these protein families, Cas1 appears to be ubiquitous among different CRISPR/Cas systems. There are three types of CRISPR-Cas system. Among them, Type II CRISPR/Cas system involving Cas9 protein and crRNA and tracrRNA is representative and is well known. Particular combinations of cas genes and repeat structures have been used to define 8 CRISPR subtypes ( E. coli , Ypest, Nmeni, Dvulg, Tneap, Hmari, Apern, and Mtube).
  • the Cas protein may be linked to a protein transduction domain.
  • the protein transduction domain may be poly-arginine or a TAT protein derived from HIV, but it is not limited thereto.
  • the present composition may comprise Cas component in the form of a protein or in the form of a nucleic acid encoding Cas protein.
  • Cas protein may be any Cas protein provided that it has an endonuclease or nickase activity when complexed with a guide RNA.
  • Cas protein is Cas9 protein or variants thereof.
  • the variant of the Cas9 protein may be a mutant form of Cas9 in which the cataytic asapartate residue is changed to any other amino acid.
  • the other amino acid may be an alanine, but it is not limited thereto.
  • Cas protein may be the one isolated from an organism such as Streptococcus sp., preferably Streptococcus pyogens or a recombinant protein, but it is not limited thereto.
  • the Cas protein derived from Streptococcus pyogens may recognizes NGG trinucleotide.
  • the Cas protein may comprise an amino acid sequence of SEQ ID NO: 109, but it is not limited thereto.
  • recombinant when used with reference, e.g., to a cell, nucleic acid, protein, or vector, indicates that the cell, nucleic acid, protein or vector, has been modified by the introduction of a heterologous nucleic acid or protein or the alteration of a native nucleic acid or protein, or that the cell is derived from a cell so modified.
  • a recombinant Cas protein may be generated by reconstituting Cas protein-encoding sequence using the human codon table.
  • Cas protein-encoding nucleic acid may be a form of vector, such as plasmid comprising Cas-encoding sequence under a promoter such as CMV or CAG.
  • Cas protein is Cas9
  • Cas9 encoding sequence may be derived from Streptococcus sp., and preferably derived from Streptococcus pyogenes .
  • Cas9 encoding nucleic acid may comprise the nucleotide sequence of SEQ ID. NO: 1.
  • Cas9 encoding nucleic acid may comprise the nucleotide sequence having homology of at least 50% to the sequence of SEQ ID NO: 1, preferably at least 60, 70, 80, 90, 95, 97, 98, or 99% to the SEQ ID NO:1, but it is not limited thereto.
  • Cas9 encoding nucleic acid may comprise the nucleotide sequence of SEQ ID NOs. 108, 110, 106, or 107.
  • guide RNA refers to a RNA which is specific for the target DNA and can form a complex with Cas protein and bring Cas protein to the target DNA.
  • the guide RNA may consist of two RNA, i.e., CRISPR RNA (crRNA) and transactivating crRNA (tracrRNA) or be a single-chain RNA (sgRNA) produced by fusion of an essential portion of crRNA and tracrRNA.
  • crRNA CRISPR RNA
  • tracrRNA transactivating crRNA
  • sgRNA single-chain RNA
  • the guide RNA may be a dualRNA comprising a crRNA and a tracrRNA.
  • the guide RNA comprises the essential portion of crRNA and tracrRNA and a portion complementary to a target, any guide RNA may be used in the present invention.
  • the crRNA may hybridize with a target DNA.
  • the RGEN may consist of Cas protein, and dualRNA (invariable tracrRNA and target-specific crRNA), or Cas protein and sgRNA (fusion of an essential portion of invariable tracrRNA and target-specific crRNA), and may be readily reprogrammed by replacing crRNA.
  • the guide RNA further comprises one or more additional nucleotides at the 5′ end of the single-chain guide RNA or the crRNA of the dualRNA.
  • the guide RNA further comprises 2-additional guanine nucleotides at the 5′ end of the single-chain guide RNA or the crRNA of the dualRNA.
  • the guide RNA may be transferred into a cell or an organism in the form of RNA or DNA that encodes the guide RNA.
  • the guide RNA may be in the form of an isolated RNA, RNA incorporated into a viral vector, or is encoded in a vector.
  • the vector may be a viral vector, plasmid vector, or agrobacterium vector, but it is not limited thereto.
  • a DNA that encodes the guide RNA may be a vector comprising a sequence coding for the guide RNA.
  • the guide RNA may be transferred into a cell or organism by transfecting the cell or organism with the isolated guide RNA or plasmid DNA comprising a sequence coding for the guide RNA and a promoter.
  • the guide RNA may be transferred into a cell or organism using virus-mediated gene delivery.
  • the guide RNA When the guide RNA is transfected in the form of an isolated RNA into a cell or organism, the guide RNA may be prepared by in vitro transcription using any in vitro transcription system known in the art.
  • the guide RNA is preferably transferred to a cell in the form of isolated RNA rather than in the form of plasmid comprising encoding sequence for a guide RNA.
  • isolated RNA may be interchangeable to “naked RNA”. This is cost- and time-saving because it does not require a step of cloning.
  • the use of plasmid DNA or virus-mediated gene delivery for transfection of the guide RNA is not excluded.
  • the present RGEN composition comprising Cas protein or Cas protein-encoding nucleic acid and a guide RNA can specifically cleave a target DNA due to a specificity of the guide RNA for a target and an endonuclease or nickase activity of Cas protein.
  • cleavage refers to the breakage of the covalent backbone of a nucleotide molecule.
  • a guide RNA may be prepared to be specific for any target which is to be cleaved. Therefore, the present RGEN composition can cleave any target DNA by manipulating or genotyping the target-specific portion of the guide RNA.
  • the guide RNA and the Cas protein may function as a pair.
  • the term “paired Cas nickase” may refer to the guide RNA and the Cas protein functioning as a pair.
  • the pair comprises two guide RNAs.
  • the guide RNA and Cas protein may function as a pair, and induce two nicks on different DNA strand.
  • the two nicks may be separated by at least 100 bps, but are not limited thereto.
  • paired Cas nickase allow targeted mutagenesis and large deletions of up to 1-kbp chromosomal segments in human cells.
  • paired nickases did not induce indels at off-target sites at which their corresponding nucleases induce mutations.
  • paired nickases did not promote unwanted translocations associated with off-target DNA cleavages.
  • paired nickases double the specificity of Cas9-mediated mutagenesis and will broaden the utility of RNA-guided enzymes in applications that require precise genome editing such as gene and cell therapy.
  • the composition may be used in the genotyping of a genome in the eukaryotic cells or organisms in vitro.
  • the guide RNA may comprise the nucleotide sequence of Seq ID. No. 1, wherein the portion of nucleotide position 3 ⁇ 22 is a target-specific portion and thus, the sequence of this portion may be changed depending on a target.
  • a eukaryotic cell or organism may be yeast, fungus, protozoa, plant, higher plant, and insect, or amphibian cells, or mammalian cells such as CHO, HeLa, HEK293, and COS-1, for example, cultured cells (in vitro), graft cells and primary cell culture (in vitro and ex vivo), and in vivo cells, and also mammalian cells including human, which are commonly used in the art, without limitation.
  • Cas9 protein/single-chain guide RNA could generate site-specific DNA double-strand breaks in vitro and in mammalian cells, whose spontaneous repair induced targeted genome mutations at high frequencies.
  • composition comprising Cas protein and a guide RNA may be used to develop therapeutics or value-added crops, livestock, poultry, fish, pets, etc.
  • the present invention provides a composition for inducing targeted mutagenesis in eukaryotic cells or organisms, comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • the present invention provides a use of the composition for inducing targeted mutagenesis in eukaryotic cells or organisms, comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • a guide RNA, Cas protein-encoding nucleic acid or Cas protein are as described in the above.
  • the present invention provides a kit for cleaving a target DNA or inducing targeted mutagenesis in eukaryotic cells or organisms comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • a guide RNA, Cas protein-encoding nucleic acid or Cas protein are as described in the above.
  • the kit may comprise a guide RNA and Cas protein-encoding nucleic acid or Cas protein as separate components or as one composition.
  • the present kit may comprise some additional components necessary for transferring the guide RNA and Cas component to a cell or an organism.
  • the kit may comprise an injection buffer such as DEPC-treated injection buffer, and materials necessary for analysis of mutation of a target DNA, but are not limited thereto.
  • the present invention provides a method for preparing a eukaryotic cell or organism comprising Cas protein and a guide RNA comprising a step of co-transfecting or serial-transfecting the eukaryotic cell or organism with a Cas protein-encoding nucleic acid or Cas protein, and a guide RNA or DNA that encodes the guide RNA.
  • a guide RNA, Cas protein-encoding nucleic acid or Cas protein are as described in the above.
  • a Cas protein-encoding nucleic acid or Cas protein and a guide RNA or DNA that encodes the guide RNA may be transferred into a cell by various methods known in the art, such as microinjection, electroporation, DEAEdextran treatment, lipofection, nanoparticle-mediated transfection, protein transduction domain mediated transduction, virus-mediated gene delivery, and PEG-mediated transfection in protoplast, and so on, but are not limited thereto.
  • a Cas protein encoding nucleic acid or Cas protein and a guide RNA may be transferred into an organism by various method known in the art to administer a gene or a protein such as injection.
  • a Cas protein-encoding nucleic acid or Cas protein may be transferred into a cell in the form of complex with a guide RNA, or separately. Cas protein fused to a protein transduction domain such as Tat can also be delivered efficiently into cells.
  • the eukarotic cell or organisms is co-transfected or serial-transfected with a Cas9 protein and a guide RNA.
  • serial-transfection may be performed by transfection with Cas protein-encoding nucleic acid first, followed by second transfection with naked guide RNA.
  • the second transfection is after 3, 6, 12, 18, 24 hours, but it is not limited thereto.
  • the present invention provides a eukaryotic cell or organism comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • the eukaryotic cells or organisms may be prepared by transferring the composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein into the cell or organism.
  • the eukaryotic cell may be yeast, fungus, protozoa, higher plant, and insect, or amphibian cells, or mammalian cells such as CHO, HeLa, HEK293, and COS-1, for example, cultured cells (in vitro), graft cells and primary cell culture (in vitro and ex vivo), and in vivo cells, and also mammalian cells including human, which are commonly used in the art, without limitation.
  • the organism may be yeast, fungus, protozoa, plant, higher plant, insect, amphibian, or mammal.
  • the present invention provides a method for cleaving a target DNA or inducing targeted mutagenesis in eukaryotic cells or organisms, comprising a step of treating a cell or organism comprising a target DNA with a composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • the step of treating a cell or organism with the composition may be performed by transferring the present composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein into the cell or organism.
  • such transfer may be performed by microinjection, transfection, electroporation, and so on.
  • the present invention provides an embryo comprising a genome edited by the present RGEN composition comprising a guide RNA specific for target DNA or DNA that encodes the guide RNA, and Cas protein-encoding nucleic acid or Cas protein.
  • the embryo may be an embryo of a mouse.
  • the embryo may be produced by injecting PMSG (Pregnant Mare Serum Gonadotropin) and hCG (human Coldinic Gonadotropin) into a female mouse of 4 to 7 weeks and the super-ovulated female mouse may be mated to males, and the fertilized embryos may be collected from oviduts.
  • PMSG Pregnant Mare Serum Gonadotropin
  • hCG human Cold-ovulated female mouse may be mated to males, and the fertilized embryos may be collected from oviduts.
  • the present RGEN composition introduced into an embryo can cleave a target DNA complementary to the guide RNA by the action of Cas protein and cause a mutation in the target DNA.
  • the embryo into which the present RGEN composition has been introduced has an edited genome.
  • the present RGEN composition could cause a mutation in a mouse embryo and the mutation could be transmitted to offsprings.
  • a method for introducing the RGEN composition into the embryo may be any method known in the art, such as microinjection, stem cell insertion, retrovirus insertion, and so on.
  • a microinjection technique can be used.
  • the present invention provides a genome-modified animal obtained by transferring the embryo comprising a genome edited by the present RGEN composition into the oviducts of an animal.
  • the term “genome-modified animal” refers to an animal of which genome has been modified in the stage of embryo by the present RGEN composition and the type of the animal is not limited.
  • the genome-modified animal has mutations caused by a targeted mutagenesis based on the present RGEN composition.
  • the mutations may be any one of deletion, insertion, translocation, inversion.
  • the site of mutation depends on the sequence of guide RNA of the RGEN composition.
  • the genome-modified animal having a mutation of a gene may be used to determine the function of the gene.
  • the present invention provides a method of preparing a genome-modified animal comprising a step of introducing the present RGEN composition comprising a guide RNA specific for the target DNA or DNA that encodes the guide RNA and Cas protein-encoding nucleic acid or Cas protein into an embryo of an animal; and a step of transferring the embryo into a oviduct of pseudopregnant foster mother to produce a genome-modified animal.
  • the step of introducing the present RGEN composition may be accomplished by any method known in the art such as microinjection, stem cell insertion, retroviral insertion, and so on.
  • the present invention provides a plant regenerated form the genome-modified protoplasts prepared by the method for eukaryotic cells comprising the RGEN composition.
  • the present invention provides a composition for genotyping mutations or variations in an isolated biological sample, comprising a guide RNA specific for the target DNA sequence Cas protein.
  • the present invention provides a composition for genotyping nucleic acid sequences in pathogenic microorganisms in an isolated biological sample, comprising a guide RNA specific for the target DNA sequence and Cas protein.
  • a guide RNA, Cas protein-encoding nucleic acid or Cas protein are as described in the above.
  • genotyping refers to the “Restriction fragment length polymorphism (RFLP) assay”.
  • RFLP may be used in 1) the detection of indel in cells or organisms induced by the engineered nucleases, 2) the genotyping naturally-occurring mutations or variations in cells or organisms, or 3) the genotyping the DNA of infected pathogenic microorganisms including virus or bacteria, etc.
  • the mutations or variation may be induced by engineered nucleases in cells.
  • the engineered nuclease may be a Zinc Finger Nuclease (ZFNs), Transcription Activator-Like Effector Nucleases (TALENs), or RGENs, but it is not limited thereto.
  • ZFNs Zinc Finger Nuclease
  • TALENs Transcription Activator-Like Effector Nucleases
  • RGENs RGENs
  • biological sample includes samples for analysis, such as tissues, cells, whole blood, semm, plasma, saliva, sputum, cerbrospinal fluid or urine, but is not limited thereto
  • the mutations or variation may be a naturally-occurring mutations or variations.
  • the mutations or variations are induced by the pathogenic microorganisms. Namely, the mutations or variation occur due to the infection of pathogenic microorganisms, when the pathogenic microorganisms are detected, the biological sample is identified as infected.
  • the pathogenic microorganisms may be virus or bacteria, but are not limited thereto.
  • Engineered nuclease-induced mutations are detected by various methods, which include mismatch-sensitive Surveyor or T7 endonuclease I (T7E1) assays, RFLP analysis, fluorescent PCR, DNA melting analysis, and Sanger and deep sequencing.
  • T7E1 and Surveyor assays are widely used but often underestimate mutation frequencies because the assays detect heteroduplexes (formed by the hybridization of mutant and wild-type sequences or two different mutant sequences); they fail to detect homoduplexes formed by the hybridization of two identical mutant sequences. Thus, these assays cannot distinguish homozygous bialleic mutant clones from wild-type cells nor heterozygous biallelic mutants from heterozygous monoalleic mutants ( FIG. 22 ).
  • sequence polymorphisms near the nuclease target site can produce confounding results because the enzymes can cleave heteroduplexes formed by hybridization of these different wild-type alleles.
  • RFLP analysis is free of these limitations and therefore is a method of choice. Indeed, RFLP analysis was one of the first methods used to detect engineered nuclease-mediated mutations. Unfortunately, however, it is limited by the availability of appropriate restriction sites.
  • the present invention provides a kit for genotyping mutations or variations in an isolated biological sample, comprising the composition for genotyping mutations or variations in an isolated biological sample.
  • the present invention provides a kit for genotyping nucleic acid sequences in pathogenic microorganisms in an isolated biological sample, comprising a guide RNA specific for the target DNA sequence and Cas protein.
  • a guide RNA, Cas protein-encoding nucleic acid or Cas protein are as described in the above.
  • the present invention provides a method of genotyping mutations or variations in an isolated biological sample, using the composition for genotyping mutations or variations in an isolated biological sample.
  • the present invention provides a method of genotyping nucleic acid sequences in pathogenic microorganisms in an isolated biological sample, comprising a guide RNA specific for the target DNA sequence and Cas protein.
  • a guide RNA, Cas protein-encoding nucleic acid or Cas protein are as described in the above.
  • a Cas9 target sequence consists of a 20-bp DNA sequence complementary to crRNA or a chimeric guide RNA and the trinucleotide (5′-NGG-3′) protospacer adjacent motif (PAM) recognized by Cas9 itself ( FIG. 1A ).
  • the Cas9-coding sequence (4,104 bp), derived from Streptococcus pyogenes strain M1 GAS (NC — 002737.1), was reconstituted using the human codon usage table and synthesized using oligonucleotides.
  • 1-kb DNA segments were assembled using overlapping ⁇ 35-mer oligonucleotides and Phusion polymerase (New England Biolabs) and cloned into T-vector (SolGent).
  • SolGent SolGent
  • a full-length Cas9 sequence was assembled using four 1-kbp DNA segments by overlap PCR.
  • the Cas9-encoding DNA segment was subcloned into p3s, which was derived from pcDNA3.1 (Invitrogen).
  • a peptide tag (NH2-GGSGPPKKKRKVYPYDVPDYA-COOH, SEQ ID NO: 2) containing the HA epitope and a nuclear localization signal (NLS) was added to the C-terminus of Cas9. Expression and nuclear localization of the Cas9 protein in HEK 293T cells were confirmed by western blotting using anti-HA antibody (Santa Cruz).
  • the Cas9 cassette was subcloned into pET28-b(+) and transformed into BL21(DE3).
  • the expression of Cas9 was induced using 0.5 mM IPTG for 4 h at 25° C.
  • the Cas9 protein containing the His6-tag at the C terminus was purified using Ni-NTA agarose resin (Qiagen) and dialyzed against 20 mM HEPES (pH 7.5), 150 mM KCl, 1 mM DTT, and 10% glycerol (1).
  • Cas9 cleaved the plasmid DNA efficiently at the expected position only in the presence of the synthetic RNA and did not cleave a control plasmid that lacked the target sequence ( FIG. 1B ).
  • a RFP-GFP reporter was used to investigate whether the Cas9/guide RNA complex can cleave the target sequence incorporated between the RFP and GFP sequences in mammalian cells.
  • the GFP sequence is fused to the RFP sequence out-of-frame (2).
  • the active GFP is expressed only when the target sequence is cleaved by site-specific nucleases, which causes frameshifting small insertions or deletions (indels) around the target sequence via error-prone non-homologous end-joining (NHEJ) repair of the double-strand break (DSB) ( FIG. 2 ).
  • the RFP-GFP reporter plasmids used in this study were constructed as described previously (2). Oligonucleotides corresponding to target sites (Table 1) were synthesized (Macrogen) and annealed. The annealed oligonucleotides were ligated into a reporter vector digested with EcoRI and BamHI.
  • HEK 293T cells were co-transfected with Cas9-encoding plasmid (0.8 ⁇ g) and the RFP-GFP reporter plasmid (0.2 ⁇ g) in a 24-well plate using Lipofectamine 2000 (Invitrogen).
  • chimeric RNA (1 ⁇ g) prepared by in vitro transcription was transfected using Lipofectamine 2000.
  • transfected cells were subjected to flow cytometry and cells expressing both RFP and GFP were counted.
  • GFP-expressing cells were obtained only when the cells were transfected first with the Cas9 plasmid and then with the guide RNA 12 h later ( FIG. 2 ), demonstrating that RGENs could recognize and cleave the target DNA sequence in cultured human cells.
  • GFP-expressing cells were obtained by serial-transfection of the Cas9 plasmid and the guide RNA rather than co-transfection.
  • T7E1 T7 endonuclease I
  • K562 cells were transfected with 20 ⁇ g of Cas9-encoding plasmid using the 4D-Nucleofector, SF Cell Line 4D-Nucleofector X Kit, Program FF-120 (Lonza) according to the manufacturer's protocol.
  • K562 ATCC, CCL-243 cells were grown in RPMI1640 with 10% FBS and the penicillin/streptomycin mix (100 U/ml and 100 ⁇ g/ml, respectively).
  • in vitro transcribed chimeric RNA was nucleofected into 1 ⁇ 10 6 K562 cells.
  • the in vitro transcribed chimeric RNA had been prepared as described in the Example 1-2.
  • Mutation frequencies (Indels (%) in FIG. 3A ) estimated from the relative DNA band intensities were RNA-dosage dependent, ranging from 1.3% to 5.1%.
  • DNA sequencing analysis of the PCR amplicons corroborated the induction of RGEN-mediated mutations at the endogenous sites. Indels and microhomologies, characteristic of error-prone NHEJ, were observed at the target site.
  • the most striking off-target sites associated with these CCR5-specific engineered nucleases reside in the CCR2 locus, a close homolog of CCR5, located 15-kbp upstream of CCR5.
  • the present inventors intentionally chose the target site of our CCR5-specific RGEN to recognize a region within the CCR5 sequence that has no apparent homology with the CCR2 sequence.
  • the present inventors investigated whether the CCR5-specific RGEN had off-target effects. To this end, we searched for potential off-target sites in the human genome by identifying sites that are most homologous to the intended 23-bp target sequence. As expected, no such sites were found in the CCR2 gene. Instead, four sites, each of which carries 3-base mismatches with the on-target site, were found ( FIG. 4A ). The T7E1 assays showed that mutations were not detected at these sites (assay sensitivity, ⁇ 0.5%), demonstrating extraordinar specificities of RGENs ( FIG. 4B ).
  • PCR was used to detect the induction of chromosomal deletions in cells separately transfected with plasmids encoding the ZFN and RGEN specific to CCR5. Whereas the ZFN induced deletions, the RGEN did not ( FIG. 4C ).
  • RGENs was reprogrammed by replacing the CCR5-specific guide RNA with a newly-synthesized RNA designed to target the human C4BPB gene, which encodes the beta chain of C4b-binding protein, a transcription factor.
  • RGENs can be delivered into cells in many different forms.
  • RGENs consist of Cas9 protein, crRNA, and tracrRNA.
  • the two RNAs can be fused to form a single-chain guide RNA (sgRNA).
  • sgRNA single-chain guide RNA
  • a plasmid that encodes Cas9 under a promoter such as CMV or CAG can be transfected into cells.
  • crRNA, tracrRNA, or sgRNA can also be expressed in cells using plasmids that encode these RNAs.
  • Use of plasmids however, often results in integration of the whole or part of the plasmids in the host genome.
  • the bacterial sequences incorporated in plasmid DNA can cause unwanted immune response in vivo.
  • Plasmid DNA can persist in cells for several days post-transfection, aggravating off-target effects of RGENs.
  • Recombinant Cas9 protein complexed with in vitro transcribed guide RNA to induce targeted disruption of endogenous genes in human cells.
  • Recombinant Cas9 protein fused with the hexa-histidine tag was expressed in and purified from E. coli using standard Ni ion affinity chromatography and gel filtration. Purifed recombinant Cas9 protein was concentrated in storage buffer (20 mM HEPES pH 7.5, 150 mM KCl, 1 mM DTT, and 10% glycerol).
  • Cas9 protein/sgRNA complex was introduced directly into K562 cells by nucleofection: 1 ⁇ 10 6 K562 cells were transfected with 22.5-225 (1.4-14 ⁇ M) of Cas9 protein mixed with 100 ug (29 ⁇ M) of in vitro transcribed sgRNA (or crRNA 40 ug and tracrRNA 80 ug) in 1000 solution using the 4D-Nucleofector, SF Cell Line 4D-Nucleofector X Kit, Program FF-120 (Lonza) according to the manufacturer's protocol. After nucleofection, cells were placed in growth media in 6-well plates and incubated for 48 hr.
  • Cas9 protein/sgRNA complex induced targeted mutation at the CCR5 locus at frequencies that ranged from 4.8 to 38% in a sgRNA or Cas9 protein dose-dependent manner, on par with the frequency obtained with Cas9 plasmid transfection (45%).
  • Cas9 protein/crRNA/tracrRNA complex was able to induce mutations at a frequency of 9.4%.
  • Cas9 protein alone failed to induce mutations.
  • the forkhead box N1 (Foxn1) gene which is important for thymus development and keratinocyte differentiation (Nehls et al., 1996), and the protein kinase, DNA activated, catalytic polypeptide (Prkdc) gene, which encodes an enzyme critical for DNA DSB repair and recombination (Taccioli et al., 1998) were used.
  • Cas9 mRNA and sgRNAs were synthesized in vitro from linear DNA templates using the mMESSAGE mMACHINE T7 Ultra kit (Ambion) and MEGAshortscript T7 kit (Ambion), respectively, according to the manufacturers' instructions, and were diluted with appropriate amounts of diethyl pyrocarbonate (DEPC, Sigma)-treated injection buffer (0.25 mM EDTA, 10 mM Tris, pH 7.4). Templates for sgRNA synthesis were generated using oligonucleotides listed in Table 3. Recombinant Cas9 protein was obtained from ToolGen, Inc.
  • Cas9 mRNA and sgRNAs in M2 medium were injected into the cytoplasm of fertilized eggs with well-recognized pronuclei using a Piezo-driven micromanipulator (Prime Tech).
  • the recombinant Cas9 protein: Foxn1-sgRNA complex was diluted with DEPC-treated injection buffer (0.25 mM EDTA, 10 mM Tris, pH 7.4) and injected into male pronuclei using a TransferMan NK2 micromanipulator and a FemtoJet microinjector (Eppendorf).
  • the manipulated embryos were transferred into the oviducts of pseudo-pregnant foster mothers to produce live animals, or were cultivated in vitro for further analyses.
  • T7E1 assays were performed as previously described using genomic DNA samples from tail biopsies and lysates of whole embryos (Cho et al., 2013).
  • the genomic region encompassing the RGEN target site was PCR-amplified, melted, and re-annealed to form heteroduplex DNA, which was treated with T7 endonuclease 1 (New England Biolabs), and then analyzed by agarose gel electrophoresis. Potential off-target sites were identified by searching with bowtie 0.12.9 and were also similarly monitored by T7E1 assays.
  • the primer pairs used in these assays were listed in Tables 4 and 5.
  • mutant fractions (the number of mutant embryos/the number of total embryos) were dose-dependent, ranging from 33% (1 ng/ ⁇ l sgRNA) to 91% (100 ng/ ⁇ l) ( FIG. 6 b ).
  • Sequence analysis confirmed mutations in the Foxn1 gene; most mutations were small deletions ( FIG. 6 c ), reminiscent of those induced by ZFNs and TALENs (Kim et al., 2013).
  • mutant fractions were proportional to the doses of Foxn1-sgRNA, and reached up to 93% (100 ng/ ⁇ l Foxn1-sgRNA) (Tables 6 and 7, FIG. 5 b ).
  • Prkdc-targeted mice To generate Prkdc-targeted mice, we applied a 5-fold higher concentration of Cas9 mRNA (50 ng/ ⁇ l) with increasing doses of Prkdc-sgRNA (50, 100, and 250 ng/ ⁇ l). Again, the birth rates were very high, ranging from 51% to 60%, enough to produce a sufficient number of newborns for the analysis (Table 6). The mutant fraction was 57% (21 mutant founders among 37 newborns) at the maximum dose of Prkdc-sgRNA. These birth rates obtained with RGENs were approximately 2- to 10-fold higher than those with TALENs reported in our previous study (Sung et al., 2013). These results demonstrate that RGENs are potent gene-targeting reagents with minimal toxicity.
  • Genotyping Summary Detected alleles 58* 1 not determined ⁇ 11 19 100 bi-allelic ⁇ 60/+1 20 100 bi-allelic ⁇ 67/ ⁇ 19 13 100 bi-allelic ⁇ 18/+455 32 10 bi-allelic (heterozygote) ⁇ 13/ ⁇ 15 + 1 115 10 bi-allelic (heterozygote) ⁇ 18/ ⁇ 5 111 10 bi-allelic (heterozygote) ⁇ 11/+1 110 10 bi-allelic (homozygote) ⁇ 8/ ⁇ 8 120 10 bi-allelic (homozygote) +2/+2 81 100 heterozygote +1/WT 69 100 homozygote ⁇ 11/ ⁇ 11 55 1 mosaic ⁇ 18/ ⁇ 1/ +1/+3 56 1 mosaic ⁇ 127/ ⁇ 41 / ⁇ 2/ +1 127 1 mosaic ⁇ 18 / +1/WT 53 1 mosaic ⁇ 11
  • the Cas9 coding sequence (4104 bps), derived from Streptococcus pyogenes strain M1 GAS (NC — 002737.1), was cloned to pET28-b(+) plasmid.
  • a nuclear targeting sequence (NLS) was included at the protein N terminus to ensure the localization of the protein to the nucleus.
  • pET28-b(+) plasmid containing Cas9 ORF was transformed into BL21(DE3).
  • Cas9 was then induced using 0.2 mM IPTG for 16 hrs at 18° C. and purified using Ni-NTA agarose beads (Qiagen) following the manufacturer's instructions. Purified Cas9 protein was concentrated using Ultracel—100K (Millipore).
  • the genomic sequence of the Arabidopsis gene encoding the BRI1 was screened for the presence of a NGG motif, the so called protospacer adjacent motif (PAM), in an exon which is required for Cas9 targeting
  • PAM protospacer adjacent motif
  • sgRNAs were produced in vitor using template DNA. Each template DNA was generated by extension with two partially overlapped oligonucleotides (Macrogen, Table X1) and Phusion polymerase (Thermo Scientific) using the following conditions—98° C. 30 sec ⁇ 98° C. 10 sec, 54° C. 20 sec, 72° C. 2 min ⁇ 20, 72° C. 5 min.
  • Oligonucleotides for the production of the template DNA for in vitro transcription SEQ Oligonuc- ID leotides Sequence (5′-3′) NO BRI1 target 1 GAAATTAATACGACTCACTATAGGTTTGAA 73 (Forward) AGATGGAAGCGCGGGTTTTAGAGCTAGAA ATAGCAAGTTAAAATAAGGCTAGTCCG BRI1 target 2 GAAATTAATACGACTCACTATAGGTGAAAC 74 (Forward) TAAACTGGTCCACAGTTTTAGAGCTAGAAA TAGCAAGTTAAAATAAGGCTAGTCCG Universal AAAAAAGCACCGACTCGGTGCCACTTTTTC 75 (Reverse) AAGTTGATAACGGACTAGCCTTATTTTAAC TTGC
  • the extended DNA was purified and used as a template for the in vitro production of the guide RNA's using the MEGAshortscript T7 kit (Life Technologies). Guide RNA were then purified by Phenol/Chloroform extraction and ethanol precipitation.
  • 10 ul of purified Cas9 protein (12 ⁇ g/ ⁇ l) and 4 ul each of two sgRNAs (11 ⁇ g/ ⁇ l) were mixed in 20 ⁇ l NEB3 buffer (New England Biolabs) and incubated for 10 min at 37° C.
  • the leaves of 4-week-old Arabidopsis seedlings grown aseptically in petri dishes were digested in enzyme solution (1% cellulose R10, 0.5% macerozyme R10, 450 mM mannitol, 20 mM MES pH 5.7 and CPW salt) for 8 ⁇ 16 hrs at 25° C. with 40 rpm shaking in the dark. Enzyme/protoplast solutions were filtered and centrifuged at 100 ⁇ g for 3 ⁇ 5 min. Protoplasts were re-suspended in CPW solution after counting cells under the microscope ( ⁇ 100) using a hemacytometer.
  • enzyme solution 1% cellulose R10, 0.5% macerozyme R10, 450 mM mannitol, 20 mM MES pH 5.7 and CPW salt
  • protoplasts were re-suspended at 1 ⁇ 10 6 /ml in MMG solution (4 mM HEPES pH 5.7, 400 mM mannitol and 15 mM MgCl2).
  • MMG solution 4 mM HEPES pH 5.7, 400 mM mannitol and 15 mM MgCl2.
  • Cas9/sgRNA complex 200 ⁇ L (200,000 protoplasts) of the protoplast suspension were gently mixed with 3.3 or 10 uL of Cas9/sgRNA complex [Cas9 protein (6 ⁇ g/ ⁇ L) and two sgRNAs (2.2 ⁇ g/ ⁇ L each)] and 200 ul of 40% polyethylene glycol transfection buffer (40% PEG4000, 200 mM mannitol and 100 mM CaCl2) in 2 ml tubes.
  • Cas9 with a cysteine at the C-terminal was prepared by PCR amplification using the previously described Cas9 plasmid ⁇ Cho, 2013 #166 ⁇ as the template and cloned into pET28-(a) vector (Novagen, Merk Millipore, Germany) containing His-tag at the N-terminus.
  • 293T Human embryonic kidney cell line
  • HeLa human ovarian cancer cell line
  • DMEM Gibco-BRL Rockville
  • E. coli BL21 cells were transformed with thepET28-(a) vector encoding Cas9 and plated onto Luria-Bertani (LB) agar medium containing 50 ⁇ g/mL kanamycin (Amresco, Solon, Ohio). Next day, a single colony was picked and cultured in LB broth containing 50 ⁇ g/mL kanamycin at 37° C. overnight. Following day, this starter culture at 0.1 OD600 was inoculated into Luria broth containing 50 ⁇ g/mL kanamycin and incubated for 2 hrs at 37° C. until OD600 reached to 0.6-0.8. To induce Cas9 protein expression, the cells were cultured at 30° C. overnight after addition of isopropyl- ⁇ -D-thiogalactopyranoside (IPTG) (Promega, Madison, Wis.) to the final concentration of 0.5 mM.
  • IPTG isopropyl- ⁇ -D-thiogalactopyranoside
  • the cells were collected by centrifugation at 4000 rpm for 15-20 mins, resuspendedin a lysis buffer (20 mM Tris-Cl pH8.0, 300 mM NaCl, 20 mM imidazole, 1 ⁇ protease inhibitor cocktail, 1 mg/ml lysozyme), and lysed by sonication (40% duty, 10 sec pulse, 30 sec rest, for 10 mins on ice).
  • the soluble fraction was separated as the supernatant after centrifugation at 15,000 rpm for 20 mins at 4° C.
  • Cas9 protein was purified at 4° C. using a column containing Ni-NTA agarose resin (QIAGEN) and AKTA prime instrument (AKTA prime, GE Healthcare, UK).
  • soluble protein fractions were loaded onto Ni-NTA agarose resin column (GE Healthcare, UK) at the flow rate of 1 mL/min.
  • the column was washed with a washing buffer (20 mM Tris-Cl pH8.0, 300 mM NaCl, 20 mM imidazole, lx protease inhibitor cocktail) and the bound protein was eluted at the flow rate of 0.5 ml/min with an elution buffer (20 mM Tris-Cl pH8.0, 300 mM NaCl, 250 mM imidazole, 1 ⁇ protease inhibitor cocktail).
  • the pooled eluted fraction was concentrated and dialyzed against storage buffer (50 mM Tris-HCl, pH8.0, 200 mM KCl, 0.1 mM EDTA, 1 mM DTT, 0.5 mM PMSF, 20% Glycerol). Protein concentration was quantitated by Bradford assay (Biorad, Hercules, Calif.) and purity was analyzed by SDS-PAGE using bovine serum albumin as the control.
  • sgRNA (1 ⁇ g) was gently added to various amounts of C9R4LC peptide (ranging from 1 to 40 weight ratio) in 100 ⁇ l of DPBS (pH 7.4). This mixture was incubated at room temperature for 30 mins and diluted to 10 folds using RNAse-free deionized water. The hydrodynamic diameter and z-potential of the formed nanoparticles were measured using dynamic light scattering (Zetasizer-nano analyzer ZS; Malvern instruments, Worcestershire, UK).
  • Cas9-9R4L and sgRNA-C9R4LC were treated to the cells as follows: 1 ⁇ g of sgRNA and 15 ⁇ g of C9R4LC peptide were added to 250 mL of OPTIMEM medium and incubated at room temperature for 30 mins. At 24 hrs after seeding, cells were washed with OPTIMEM medium and treated with sgRNA-C9R4LC complex for 4 hrs at 37° C. Cells were washed again with OPTIMEM medium and treated with Cas9-9R4L for 2 hrs at 37° C. After treatment, culture media was replaced with serum-containing complete medium and incubated at 37° C. for 24 hrs before the next treatment. Same procedure was followed for multiple treatments of Cas9 and sgRNA for three consecutive days.
  • Cas9-9R4L and sgRNA-9R4L can Edit Endogenous Genes in Cultured Mammalian Cells without the Use of Additional Delivery Tools
  • our guide RNA had two additional guanine nucleotides at the 5′ end, which are required for efficient transcription by T7 polymerase in vitro. No such additional nucleotides were included in the sgRNA used by others.
  • the RNA sequence of our guide RNA can be shown as 5′-GGX 20 , whereas 5′-GX 19 , in which X 20 or GX 19 corresponds to the 20-bp target sequence, represents the sequence used by others.
  • the first guanine nucleotide is required for transcription by RNA polymerase in cells. To test whether off-target RGEN effects can be attributed to these differences, we chose four RGENs that induced off-target mutations in human cells at high frequencies (13).
  • SSBs single-strand breaks
  • HDR homology-directed repair
  • nickase-induced targeted mutagenesis via HDR is much less efficient than is nuclease-induced mutagenesis.
  • paired Cas9 nickases would produce composite DSBs, which trigger DNA repair via NHEJ or HDR, leading to efficient mutagenesis ( FIG. 16A ).
  • paired nickases would double the specificity of Cas9-based genome editing.
  • Cas9 nucleases and nickases designed to target sites in the AAVS1 locus ( FIG. 16B ) in vitro via fluorescent capillary electrophoresis.
  • Cas9 nickases composed of guide RNA and a mutant form of Cas9 in which a catalytic aspartate residue is changed to an alanine (D10A Cas9) cleaved only one strand, producing site-specific nicks (FIG. 16 C,D).
  • some nickases AS1, AS2, AS3, and S6 in FIG.
  • the Cas9 nuclease complexed with the S2 sgRNA was equally efficient at this site and the on-target site.
  • D10A Cas9 complexed with the S2 and AS2 sgRNAs discriminated this site from the on-target site by a factor of 270 fold.
  • This paired nickase also discriminated the AS2 off-target sites (Off-1 and Off-9 in FIG. 17B ) from the on-target site by factors of 160 fold and 990 fold, respectively.
  • FIG. 21A We then investigated whether Cas9 nucleases and nickases can induce unwanted chromosomal translocations that result from NHEJ repair of on-target and off-target DNA cleavages.
  • FIG. 21B We were able to detect translocations induced by Cas9 nucleases using PCR (FIG. 21 B,C). No such PCR products were amplified using genomic DNA isolated from cells transfected with the plasmids encoding the AS2+S3 Cas9 nickase pair. This result is in line with the fact that both AS2 and S3 nickases, unlike their corresponding nucleases, did not produce indels at off-target sites ( FIG. 17B ).
  • paired Cas9 nickases allow targeted mutagenesis and large deletions of up to 1-kbp chromosomal segments in human cells.
  • paired nickases did not induce indels at off-target sites at which their corresponding nucleases induce mutations.
  • paired nickases did not promote unwanted translocations associated with off-target DNA cleavages.
  • paired nickases double the specificity of Cas9-mediated mutagenesis and will broaden the utility of RNA-guided enzymes in applications that require precise genome editing such as gene and cell therapy.
  • paired nickases double the specificity of Cas9-mediated mutagenesis and will broaden the utility of RNA-guided enzymes in applications that require precise genome editing such as gene and cell therapy.
  • One caveat to this approach is that two highly active sgRNAs are needed to make an efficient nickase pair, limiting targetable sites.
  • RGENs can be used in Restriction fragment length polymorphism (RFLP) analysis, replacing conventional restriction enzymes.
  • Engineered nucleases including RGENs induce indels at target sites, when the DSBs caused by the nucleases are repaired by the error-prone non-homologous end-joining (NHEJ) system.
  • NHEJ error-prone non-homologous end-joining
  • crRNA and tracrRNA were prepared by in vitro transcription using MEGAshortcript T7 kit (Ambion) according to the manufacturer's instruction. Transcribed RNAs were resolved on a 8% denaturing urea-PAGE gel. The gel slice containing RNA was cut out and transferred to elution buffer. RNA was recovered in nuclease-free water followed by phenol:chloroform extraction, chloroform extraction, and ethanol precipitation. Purified RNA was quantified by spectrometry.
  • Templates for crRNA were prepared by annealing an oligonucleotide whose sequence is shown as 5′-GAAATTAATACGACTCACTATAGGX 20 GTTTTAGAGCTATGCTGTTTTG-3′ (SEQ ID NO: 76), in which X 20 is the target sequence, and its complementary oligonucleotide.
  • the template for tracrRNA was synthesized by extension of forward and reverse oligonucleotides (5′-GAAATTAATACGACTCACTATAGGAACCATTCAAAACAGCATAGCAAG TTAAAATAAGGCTAGTCCG-3′ (SEQ ID NO: 77) and 5′-AAAAAAAGCACCGACTCGGTGCCACTTTTTCAAGTTGATAACGGACTAG CCTTATTTTAACTTGCTATG-3′(SEQ ID NO: 78)) using Phusion polymerase (New England Biolabs).
  • the Cas9 DNA construct used in our previous Example which encodes Cas9 fused to the His6-tag at the C terminus, was inserted in the pET-28a expression vector.
  • the recombinant Cas9 protein was expressed in E. coli strain BL21(DE3) cultured in LB medium at 25° C. for 4 hour after induction with 1 mM IPTG. Cells were harvested and resuspended in buffer containing 20 mM Tris PH 8.0, 500 mM NaCl, 5 mM immidazole, and 1 mM PMSF. Cells were frozen in liquid nitrogen, thawed at 4° C., and sonicated.
  • the Cas9 protein in the lysate was bound to Ni-NTA agarose resin (Qiagen), washed with buffer containing 20 mM Tris pH 8.0, 500 mM NaCl, and 20 mM immidazole, and eluted with buffer containing 20 mM Tris pH 8.0, 500 mM NaCl, and 250 mM immidazole.
  • Purified Cas9 protein was dialyzed against 20 mM HEPES (pH 7.5), 150 mM KCl, 1 mM DTT, and 10% glycerol and analyzed by SDS-PAGE.
  • the T7E1 assay was performed as following. In brief, PCR products amplified using genomic DNA were denatured at 95° C., reannealed at 16° C., and incubated with 5 units of T7 Endonuclease I (New England BioLabs) for 20 min at 37° C. The reaction products were resolved using 2 to 2.5% agarose gel electrophoresis.
  • PCR products (100-150 ng) were incubated for 60 min at 37° C. with optimized concentrations (Table 10) of Cas9 protein, tracrRNA, crRNA in 10 ⁇ l NEB buffer 3 (1 ⁇ ). After the cleavage reaction, RNase A (4 ⁇ g) was added, and the reaction mixture was incubated for 30 min at 37° C. to remove RNA. Reactions were stopped with 6 ⁇ stop solution buffer containing 30% glycerol, 1.2% SDS, and 100 mM EDTA. Products were resolved with 1-2.5% agarose gel electrophoresis and visualized with EtBr staining.
  • Restriction enzyme-treated linearized plasmid 100 ng was incubated for 60 min at 37° C. with Cas9 protein (0.1 ⁇ g), tracrRNA (60 ng), and crRNA (25 ng) in 10 ⁇ l NEB 3 buffer (1 ⁇ ). Reactions were stopped with 6 ⁇ stop solution containing 30% glycerol, 1.2% SDS, and 100 mM EDTA. Products were resolved with 1% agarose gel electrophoresis and visualized with EtBr staining.
  • New RGENs with desired DNA specificities can be readily created by replacing crRNA; no de novo purification of custom proteins is required once recombinant Cas9 protein is available.
  • Engineered nucleases, including RGENs induce small insertions or deletions (indels) at target sites when the DSBs caused by the nucleases are repaired by error-prone non-homologous end-joining (NHEJ).
  • NHEJ error-prone non-homologous end-joining
  • RGENs can differentially cleave plasmids that contain wild-type or modified C4BPB target sequences that harbor 1- to 3-base indels at the cleavage site. None of the six plasmids with these indels were cleaved by a C4BPB-specific RGEN5 composed of target-specific crRNA, tracrRNA, and recombinant Cas9 protein ( FIG. 23 ). In contrast, the plasmid with the intact target sequence was cleaved efficiently by this RGEN.
  • Target sequence of RGENs used in this study Gene Target sequence SEQ ID NO human AATGACCACTACATCCTCAA 104 C4BPB GGG mouse Pibf1 AGATGATGTCTCATCATCAG 105 AGG
  • C4BPB mutant clones used in this study have various mutations ranging from 94 bp deletion to 67 bp insertion ( FIG. 24A ). Importantly, all mutations occurred in mutant clones resulted in the loss of RGEN target site. Among 6 C4BPB clones analyzed, 4 clones have both wildtype and mutant alleles (+/ ⁇ ) and 2 clones have only mutant alleles ( ⁇ / ⁇ ).
  • PCR products spanning the RGEN target site amplified from wildtype K562 genomic DNA were digested completely by the RGEN composed of target-specific crRNA, tracrRNA, and recombinant Cas9 protein expressed in and purified from E. coli (FIG. 24 B/Lane 1).
  • RGEN target-specific crRNA
  • tracrRNA tracrRNA
  • Cas9 protein expressed in and purified from E. coli FIG. 24 B/Lane 1
  • PCR amplicons of +/ ⁇ clones that contained both wild-type and mutant alleles were partially digested, and those of ⁇ / ⁇ cloned that did not contain the wildtype allele were not digested at all, yielding no cleavage products corresponding to the wildtype sequence ( FIG. 24B ).
  • RGEN-RFLP analysis is a quantitative method. Genomic DNA samples isolated from the C4BPB null clone and the wild-type cells were mixed at various ratios and used for PCR amplifications. The PCR products were subjected to RGEN genotyping and the T7E1 assay in parallel ( FIG. 25 b ). As expected, DNA cleavage by the RGEN was proportional to the wild type to mutant ratio. In contrast, results of the T7E1 assay correlated poorly with mutation frequencies inferred from the ratios and were inaccurate, especially at high mutant %, a situation in which complementary mutant sequences can hybridize with each other to form homoduplexes.
  • RGEN genotyping in short
  • RGEN genotyping was applied to the analysis of mutant mouse founders that had been established by injection of TALENs into mouse one-cell embryos.
  • FIG. 26A We designed and used an RGEN that recognized the TALEN target site in the Pibf1 gene (Table 10).
  • Genomic DNA was isolated from a wildtype mouse and mutant mice and subjected to RGEN genotyping after PCR amplification.
  • RGEN genotyping successfully detected various mutations, which ranged from one to 27-bp deletions ( FIG. 26B ).
  • RGEN genotyping enabled differential detection of +/ ⁇ and ⁇ / ⁇ founder.
  • RGENs to detect mutations induced in human cells by a CCR5-specific ZFN, representing yet another class of engineered nucleases ( FIG. 27 ). These results show that RGENs can detect mutations induced by nucleases other than RGENs themselves. In fact, we expect that RGENs can be designed to detect mutations induced by most, if not all, engineered nucleases.
  • the only limitation in the design of an RGEN genotyping assay is the requirement for the GG or AG (CC or CT on the complementary strand) dinucleotide in the PAM sequence recognized by the Cas9 protein, which occurs once per 4 bp on average.
  • Indels induced anywhere within the seed region of several bases in crRNA and the PAM nucleotides are expected to disrupt RGEN-catalyzed DNA cleavage. Indeed, we identified at least one RGEN site in most (98%) of the ZFN and TALEN sites.
  • RGEN-RFLP analysis has applications beyond genotyping of engineered nuclease-induced mutations.
  • HCT116 human colorectal cancer cell line
  • PCR products amplified from HCT116 genomic DNA were cleaved partially by both wild-type-specific and mutant-specific RGENs, in line with the heterozygous genotype in HCT116 cells ( FIG. 29 a ).
  • PCR products amplified from DNA from HeLa cells harboring only wild-type alleles were digested completely by the wild-type-specific RGEN and were not cleaved at all by the mutation-specific RGEN.
  • HEK293 cells harbor the 32-bp deletion (del32) in the CCR5 gene, which encodes an essential co-receptor of HIV infection: Homozygous del32 CCR5 carriers are immune to HIV infection.
  • the wild-type-specific RGEN cleaved the PCR products obtained from K562, SKBR3, or HeLa cells (used as wild-type controls) completely but those from HEK293 cells partially ( FIG. 30 a ), confirming the presence of the uncleavable del32 allele in HEK293 cells.
  • the del32-specific RGEN cleaved the PCR products from wild-type cells as efficiently as those from HEK293 cells.
  • this RGEN had an off-target site with a single-base mismatch immediately downstream of the on-target site ( FIG. 30 ).
  • RGENs that contained the perfectly-matched guide RNA specific to the wild-type sequence or mutant sequence cleaved both sequences ( FIGS. 31 a and 32 a ).
  • RGENs that contained a single-base mismatched guide RNA distinguished the two sequences, enabling genotyping of three recurrent oncogenic point mutations in the KRAS, PIK3CA, and IDH1 genes in human cancer cell lines ( FIG. 29 b and FIGS. 33 a, b ).
  • RGENs as providing a platform to use simple and robust RFLP analysis for various sequence variations.
  • RGENs can be used to detect various genetic variations (single nucleotide variations, small insertion/deletions, structural variations) such as diseaserelated recurring mutations, genotypes related to drug-response by a patient and also mutations induced by engineered nucleases in cells.
  • RGEN genotyping to detect mutations induced by engineered nucleases in cells and animals. In principle, one could also use RGENs that will specifically detect and cleave naturally-occurring variations and mutations.

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US20150050699A1 (en) * 2012-03-20 2015-02-19 Vilnius University RNA-DIRECTED DNA CLEAVAGE BY THE Cas9-crRNA COMPLEX
US20150376587A1 (en) * 2014-06-25 2015-12-31 Caribou Biosciences, Inc. RNA Modification to Engineer Cas9 Activity
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