US20160017366A1 - Crispr-based genome modification and regulation - Google Patents

Crispr-based genome modification and regulation Download PDF

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US20160017366A1
US20160017366A1 US14/649,777 US201314649777A US2016017366A1 US 20160017366 A1 US20160017366 A1 US 20160017366A1 US 201314649777 A US201314649777 A US 201314649777A US 2016017366 A1 US2016017366 A1 US 2016017366A1
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cell
sequence
protein
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rna
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Fuqiang Chen
Gregory D. Davis
Qiaohua Kang
Scott W. KNIGHT
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Sigma Aldrich Co LLC
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Definitions

  • the present disclosure relates targeted genome modification.
  • the disclosure relates to RNA-guided endonucleases or fusion proteins comprising CRISPR/Cas-like protein and methods of using said proteins to modify or regulate targeted chromosomal sequences.
  • Targeted genome modification is a powerful tool for genetic manipulation of eukaryotic cells, embryos, and animals.
  • exogenous sequences can be integrated at targeted genomic locations and/or specific endogenous chromosomal sequences can be deleted, inactivated, or modified.
  • Current methods rely on the use of engineered nuclease enzymes, such as, for example, zinc finger nucleases (ZFNs) or transcription activator-like effector nucleases (TALENs).
  • ZFNs zinc finger nucleases
  • TALENs transcription activator-like effector nucleases
  • These chimeric nucleases contain programmable, sequence-specific DNA-binding modules linked to a nonspecific DNA cleavage domain.
  • Each new genomic target however, requires the design of a new ZFN or TALEN comprising a novel sequence-specific DNA-binding module.
  • these custom designed nucleases tend to be costly and time-consuming to prepare.
  • the specificities of ZFNs and TALENS are such
  • RNA-guided endonuclease wherein the endonuclease comprises at least one nuclear localization signal, at least one nuclease domain, and at least one domain that interacts with a guide RNA to target the endonuclease to a specific nucleotide sequence for cleavage.
  • the endonuclease can be derived from a Cas9 protein.
  • the endonuclease can be modified to lack at least one functional nuclease domain.
  • the endonuclease can further comprise a cell-penetrating domain, a marker domain, or both.
  • the endonuclease can be part of a protein-RNA complex comprising the guide RNA.
  • the guide RNA can be a single molecule comprising a 5′ region that is complementary to a target site.
  • an isolated nucleic acid encoding any of the RNA-guided endonucleases disclosed herein.
  • the nucleic acid can be codon optimized for translation in mammalian cells, such as, for example, human cells.
  • the nucleic acid sequence encoding the RNA-guided endonuclease can be operably linked to a promoter control sequence, and optionally, can be part of a vector.
  • a vector comprising sequence encoding the RNA-guided endonuclease, which can be operably linked to a promoter control sequence can also comprise sequence encoding a guide RNA, which can be operably linked to a promoter control sequence.
  • Another aspect of the present invention encompasses a method for modifying a chromosomal sequence in a eukaryotic cell or embryo.
  • the method comprises introducing into a eukaryotic cell or embryo (i) at least one RNA-guided endonuclease comprising at least one nuclear localization signal or nucleic acid encoding at least one RNA-guided endonuclease as defined herein, (ii) at least one guide RNA or DNA encoding at least one guide RNA, and, optionally, (iii) at least one donor polynucleotide comprising a donor sequence.
  • the method further comprises culturing the cell or embryo such that each guide RNA directs a RNA-guided endonuclease to a targeted site in the chromosomal sequence where the RNA-guided endonuclease introduces a double-stranded break in the targeted site, and the double-stranded break is repaired by a DNA repair process such that the chromosomal sequence is modified.
  • the RNA-guided endonuclease can be derived from a Cas9 protein.
  • the nucleic acid encoding the RNA-guided endonuclease introduced into the cell or embryo can be mRNA.
  • the nucleic acid encoding the RNA-guided endonuclease introduced into the cell or embryo can be DNA.
  • the DNA encoding the RNA-guided endonuclease can be part of a vector that further comprises a sequence encoding the guide RNA.
  • the eukaryotic cell can be a human cell, a non-human mammalian cell, a stem cell, a non-mammalian vertebrate cell, an invertebrate cell, a plant cell, or a single cell eukaryotic organism.
  • the embryo is a non-human one cell animal embryo.
  • a further aspect of the disclosure provides a fusion protein comprising a CRISPR/Cas-like protein or fragment thereof and an effector domain.
  • the fusion protein comprises at least one nuclear localization signal.
  • the effector domain of the fusion protein can be a cleavage domain, an epigenetic modification domain, a transcriptional activation domain, or a transcriptional repressor domain.
  • the CRISPR/Cas-like protein of the fusion protein can be derived from a Cas9 protein.
  • the Cas9 protein can be modified to lack at least one functional nuclease domain.
  • the Cas9 protein can be modified to lack all nuclease activity.
  • the effector domain can be a cleavage domain, such as, for example, a FokI endonuclease domain or a modified FokI endonuclease domain.
  • one fusion protein can form a dimer with another fusion protein.
  • the dimer can be a homodimer or a heterodimer.
  • the fusion protein can form a heterodimer with a zinc finger nuclease, wherein the cleavage domain of both the fusion protein and the zinc finger nucleases is a FokI endonuclease domain or a modified FokI endonuclease domain.
  • the fusion protein comprises a CRISPR/Cas-like protein derived from a Cas9 protein modified to lack all nuclease activity, and the effector domain is a FokI endonuclease domain or a modified FokI endonuclease domain.
  • the fusion protein comprises a CRISPR/Cas-like protein derived from a Cas9 protein modified to lack all nuclease activity, and the effector domain can be an epigenetic modification domain, a transcriptional activation domain, or a transcriptional repressor domain.
  • any of the fusion proteins disclosed herein can comprise at least one additional domain chosen from a nuclear localization signal, a cell-penetrating domain, and a marker domain. Also provided are isolated nucleic acids encoding any of the fusion proteins provided herein.
  • Still another aspect of the disclosure encompasses a method for modifying a chromosomal sequence or regulating expression of a chromosomal sequence in a cell or embryo.
  • the method comprises introducing into the cell or embryo (a) at least one fusion protein or nucleic acid encoding at least one fusion protein, wherein the fusion protein comprises a CRISPR/Cas-like protein or a fragment thereof and an effector domain, and (b) at least one guide RNA or DNA encoding at least one guide RNA, wherein the guide RNA guides the CRISPR/Cas-like protein of the fusion protein to a targeted site in the chromosomal sequence and the effector domain of the fusion protein modifies the chromosomal sequence or regulates expression of the chromosomal sequence.
  • the CRISPR/Cas-like protein of the fusion protein can be derived from a Cas9 protein.
  • the CRISPR/Cas-like protein of the fusion protein can be modified to lack at least one functional nuclease domain.
  • the CRISPR/Cas-like protein of the fusion protein can be modified to lack all nuclease activity.
  • the method can comprise introducing into the cell or embryo one fusion protein or nucleic acid encoding one fusion protein and two guide RNAs or DNA encoding two guide RNAs, and wherein one double-stranded break is introduced in the chromosomal sequence.
  • the method can comprise introducing into the cell or embryo two fusion proteins or nucleic acid encoding two fusion proteins and two guide RNAs or DNA encoding two guide RNAs, and wherein two double-stranded breaks are introduced in the chromosomal sequence.
  • the method can comprise introducing into the cell or embryo one fusion protein or nucleic acid encoding one fusion protein, one guide RNA or nucleic acid encoding one guide RNA, and one zinc finger nuclease or nucleic acid encoding one zinc finger nuclease, wherein the zinc finger nuclease comprises a FokI cleavage domain or a modified a FokI cleavage domain, and wherein one double-stranded break is introduced into the chromosomal sequence.
  • the method can further comprise introducing into the cell or embryo at least one donor polynucleotide.
  • the fusion protein comprises an effector domain chosen from an epigenetic modification domain, a transcriptional activation domain, or a transcriptional repressor domain
  • the fusion protein can comprise a Cas9 protein modified to lack all nuclease activity
  • the method can comprise introducing into the cell or embryo one fusion protein or nucleic acid encoding one fusion protein, and one guide RNA or nucleic acid encoding one guide RNA, and wherein the structure or expression of the targeted chromosomal sequence is modified.
  • the eukaryotic cell can be a human cell, a non-human mammalian cell, a stem cell, a non-mammalian vertebrate cell, an invertebrate cell, a plant cell, or a single cell eukaryotic organism.
  • the embryo is a non-human one cell animal embryo.
  • FIG. 1 diagrams genome modification using protein dimers.
  • A depicts a double stranded break created by a dimer composed of two fusion proteins, each of which comprises a Cas-like protein for DNA binding and a FokI cleavage domain.
  • B depicts a double stranded break created by a dimer composed of a fusion protein comprising a Cas-like protein and a FokI cleavage domain and a zinc finger nuclease comprising a zinc finger (ZF) DNA-binding domain and a FokI cleavage domain.
  • ZF zinc finger
  • FIG. 2 illustrates regulation of gene expression using RNA-guided fusion proteins comprising gene regulatory domains.
  • A depicts a fusion protein comprising a Cas-like protein used for DNA binding and an “AIR” domain that activates or represses gene expression.
  • B diagrams a fusion protein comprising a Cas-like protein for DNA binding and a epigenetic modification domain (“Epi-mod”) that affects epigenetic states by covalent modification of proximal DNA or proteins.
  • Epi-mod epigenetic modification domain
  • FIG. 3 diagrams genome modification using two RNA-guided endonuclease.
  • A depicts a double stranded break created by two RNA-guided endonuclease that have been converted into nickases.
  • B depicts two double stranded breaks created by two RNA-guided endonuclease having endonuclease activity.
  • FIG. 4 presents fluorescence-activated cell sorting (FACS) of human K562 cells transfected with Cas9 nucleic acid, Cas9 guiding RNA, and AAVS1-GFP DNA donor.
  • the Y axis represents the auto fluorescence intensity at a red channel, and the X axis represents the green fluorescence intensity.
  • A K562 cells transfected with 10 ⁇ g of Cas9 mRNA transcribed with an Anti-Reverse Cap Analog, 0.3 nmol of pre-annealed crRNA-tracrRNA duplex, and 10 ⁇ g of AAVS1-GFP plasmid DNA
  • B K562 cells transfected 10 ⁇ g of Cas9 mRNA transcribed with an Anti-Reverse Cap Analog, 0.3 nmol of chimeric RNA, and 10 ⁇ g of AAVS1-GFP plasmid DNA
  • C K562 cells transfected 10 ⁇ g of Cas9 mRNA that was capped by post-transcription capping reaction, 0.3 nmol of chimeric RNA, and 10 ⁇ g of AAVS1-GFP plasmid DNA
  • D K562 cells transfected with 10 ⁇ g of Cas9 plasmid DNA, 5 ⁇ g of U6-chimeric RNA plasmid DNA, and 10 ⁇ g of AA
  • FIG. 5 presents a junction PCR analysis documenting the targeted integration of GFP into the AAVS1 locus in human cells.
  • Lane M 1 kb DNA molecular markers
  • Lane A K562 cells transfected with 10 ⁇ g of Cas9 mRNA transcribed with an Anti-Reverse Cap Analog, 0.3 nmol of pre-annealed crRNA-tracrRNA duplex, and 10 ⁇ g of AAVS1-GFP plasmid DNA
  • Lane B K562 cells transfected 10 ⁇ g of Cas9 mRNA transcribed with an Anti-Reverse Cap Analog, 0.3 nmol of chimeric RNA, and 10 ⁇ g of AAVS1-GFP plasmid DNA
  • Lane C K562 cells transfected 10 ⁇ g of Cas9 mRNA that was capped by post-transcription capping reaction, 0.3 nmol of chimeric RNA, and 10 ⁇ g of AAVS1-GFP plasmid DNA
  • Lane D K562
  • RNA-guided endonucleases which comprise at least one nuclear localization signal, at least one nuclease domain, and at least one domain that interacts with a guide RNA to target the endonuclease to a specific nucleotide sequence for cleavage.
  • nucleic acids encoding the RNA-guided endonucleases as well as methods of using the RNA-guided endonucleases to modify chromosomal sequences of eukaryotic cells or embryos.
  • the RNA-guided endonuclease interacts with specific guide RNAs, each of which directs the endonuclease to a specific targeted site, at which site the RNA-guided endonuclease introduces a double-stranded break that can be repaired by a DNA repair process such that the chromosomal sequence is modified. Since the specificity is provided by the guide RNA, the RNA-based endonuclease is universal and can be used with different guide RNAs to target different genomic sequences. The methods disclosed herein can be used to target and modify specific chromosomal sequences and/or introduce exogenous sequences at targeted locations in the genome of cells or embryos. Furthermore, the targeting is specific with limited off target effects.
  • fusion proteins wherein a fusion protein comprises a CRISPR/Cas-like protein or fragment thereof and an effector domain.
  • Suitable effector domains include, without limit, cleavage domains, epigenetic modification domains, transcriptional activation domains, and transcriptional repressor domains.
  • Each fusion protein is guided to a specific chromosomal sequence by a specific guide RNA, wherein the effector domain mediates targeted genome modification or gene regulation.
  • the fusion proteins can function as dimers thereby increasing the length of the target site and increasing the likelihood of its uniqueness in the genome (thus, reducing off target effects).
  • endogenous CRISPR systems modify genomic locations based on DNA binding word lengths of approximately 13-20 bp (Cong et al., Science, 339:819-823). At this word size, only 5-7% of the target sites are unique within the genome (Iseli et al, PLos One 2 (6):e579). In contrast, DNA binding word sizes for zinc finger nucleases typically range from 30-36 bp, resulting in target sites that are approximately 85-87% unique within the human genome.
  • the smaller sized DNA binding sites utilized by CRISPR-based systems limits and complicates design of targeted CRISP-based nucleases near desired locations, such as disease SNPs, small exons, start codons, and stop codons, as well as other locations within complex genomes.
  • the present disclosure not only provides means for expanding the CRISPR DNA binding word length (i.e., so as to limit off-target activity), but further provides CRISPR fusion proteins having modified functionality. According, the disclosed CRISPR fusion proteins have increased target specificity and unique functionality(ies). Also provided herein are methods of using the fusion proteins to modify or regulate expression of targeted chromosomal sequences.
  • RNA-guided endonucleases comprising at least one nuclear localization signal, which permits entry of the endonuclease into the nuclei of eukaryotic cells and embryos such as, for example, non-human one cell embryos.
  • RNA-guided endonucleases also comprise at least one nuclease domain and at least one domain that interacts with a guide RNA.
  • An RNA-guided endonuclease is directed to a specific nucleic acid sequence (or target site) by a guide RNA.
  • the guide RNA interacts with the RNA-guided endonuclease as well as the target site such that, once directed to the target site, the RNA-guided endonuclease is able to introduce a double-stranded break into the target site nucleic acid sequence. Since the guide RNA provides the specificity for the targeted cleavage, the endonuclease of the RNA-guided endonuclease is universal and can be used with different guide RNAs to cleave different target nucleic acid sequences.
  • RNA-guided endonucleases isolated nucleic acids (i.e., RNA or DNA) encoding the RNA-guided endonucleases, vectors comprising nucleic acids encoding the RNA-guided endonucleases, and protein-RNA complexes comprising the RNA-guided endonuclease plus a guide RNA.
  • isolated nucleic acids i.e., RNA or DNA
  • vectors comprising nucleic acids encoding the RNA-guided endonucleases
  • protein-RNA complexes comprising the RNA-guided endonuclease plus a guide RNA.
  • the RNA-guided endonuclease can be derived from a clustered regularly interspersed short palindromic repeats (CRISPR)/CRISPR-associated (Cas) system.
  • CRISPR/Cas system can be a type I, a type II, or a type III system.
  • Non-limiting examples of suitable CRISPR/Cas proteins include Cas3, Cas4, Cas5, Cas5e (or CasD), Cas6, Cas6e, Cas6f, Cas7, Cas8a1, Cas8a2, Cas8b, Cas8c, Cas9, Cas10, Cas10d, CasF, CasG, CasH, Csy1, Csy2, Csy3, Cse1 (or CasA), Cse2 (or CasB), Cse3 (or CasE), Cse4 (or CasC), Csc1, Csc2, Csa5, Csn2, Csm2, Csm3, Csm4, Csm5, Csm6, Cmr1, Cmr3, Cmr4, Cmr5, Cmr6, Csb1, Csb2, Csb3, Csx17, Csx14, Csx10, Csx16, CsaX, Csx3, Csz1, Csx15,
  • the RNA-guided endonuclease is derived from a type II CRISPR/Cas system.
  • the RNA-guided endonuclease is derived from a Cas9 protein.
  • the Cas9 protein can be from Streptococcus pyogenes, Streptococcus thermophilus, Streptococcus sp., Nocardiopsis rougevillei, Streptomyces pristinaespiralis, Streptomyces viridochromogenes, Streptomyces viridochromogenes, Streptosporangium roseum, Streptosporangium roseum, Alicyclobacillus acidocaldarius, Bacillus pseudomycoides, Bacillus selenitireducens, Exiguobacterium sibiricum, Lactobacillus delbrueckii, Lactobacillus salivarius, Microscilla marina, Burkholderiales bacterium, Polaro
  • CRISPR/Cas proteins comprise at least one RNA recognition and/or RNA binding domain.
  • RNA recognition and/or RNA binding domains interact with guide RNAs.
  • CRISPR/Cas proteins can also comprise nuclease domains (i.e., DNase or RNase domains), DNA binding domains, helicase domains, RNAse domains, protein-protein interaction domains, dimerization domains, as well as other domains.
  • the CRISPR/Cas-like protein can be a wild type CRISPR/Cas protein, a modified CRISPR/Cas protein, or a fragment of a wild type or modified CRISPR/Cas protein.
  • the CRISPR/Cas-like protein can be modified to increase nucleic acid binding affinity and/or specificity, alter an enzymatic activity, and/or change another property of the protein.
  • nuclease i.e., DNase, RNase
  • the CRISPR/Cas-like protein can be truncated to remove domains that are not essential for the function of the fusion protein.
  • the CRISPR/Cas-like protein can also be truncated or modified to optimize the activity of the effector domain of the fusion protein.
  • the CRISPR/Cas-like protein can be derived from a wild type Cas9 protein or fragment thereof.
  • the CRISPR/Cas-like protein can be derived from modified Cas9 protein.
  • the amino acid sequence of the Cas9 protein can be modified to alter one or more properties (e.g., nuclease activity, affinity, stability, etc.) of the protein.
  • domains of the Cas9 protein not involved in RNA-guided cleavage can be eliminated from the protein such that the modified Cas9 protein is smaller than the wild type Cas9 protein.
  • a Cas9 protein comprises at least two nuclease (i.e., DNase) domains.
  • a Cas9 protein can comprise a RuvC-like nuclease domain and a HNH-like nuclease domain. The RuvC and HNH domains work together to cut single strands to make a double-stranded break in DNA. (Jinek et al., Science, 337: 816-821).
  • the Cas9-derived protein can be modified to contain only one functional nuclease domain (either a RuvC-like or a HNH-like nuclease domain).
  • the Cas9-derived protein can be modified such that one of the nuclease domains is deleted or mutated such that it is no longer functional (i.e., the nuclease activity is absent).
  • the Cas9-derived protein is able to introduce a nick into a double-stranded nucleic acid (such protein is termed a “nickase”), but not cleave the double-stranded DNA.
  • nickase such protein is termed a “nickase”
  • an aspartate to alanine (D10A) conversion in a RuvC-like domain converts the Cas9-derived protein into a nickase.
  • H840A or H839A a histidine to alanine (H840A or H839A) conversion in a HNH domain converts the Cas9-derived protein into a nickase.
  • Each nuclease domain can be modified using well-known methods, such as site-directed mutagenesis, PCR-mediated mutagenesis, and total gene synthesis, as well as other methods known in the art.
  • the RNA-guided endonuclease disclosed herein comprises at least one nuclear localization signal.
  • an NLS comprises a stretch of basic amino acids. Nuclear localization signals are known in the art (see, e.g., Lange et al., J. Biol. Chem., 2007, 282:5101-5105).
  • the NLS can be a monopartite sequence, such as PKKKRKV (SEQ ID NO:1) or PKKKRRV (SEQ ID NO:2).
  • the NLS can be a bipartite sequence.
  • the NLS can be KRPAATKKAGQAKKKK (SEQ ID NO:3).
  • the NLS can be located at the N-terminus, the C-terminal, or in an internal location of the RNA-guided endonuclease.
  • the RNA-guided endonuclease can further comprise at least one cell-penetrating domain.
  • the cell-penetrating domain can be a cell-penetrating peptide sequence derived from the HIV-1 TAT protein.
  • the TAT cell-penetrating sequence can be GRKKRRQRRRPPQPKKKRKV (SEQ ID NO:4).
  • the cell-penetrating domain can be TLM (PLSSIFSRIGDPPKKKRKV; SEQ ID NO:5), a cell-penetrating peptide sequence derived from the human hepatitis B virus.
  • the cell-penetrating domain can be MPG (GALFLGWLGAAGSTMGAPKKKRKV; SEQ ID NO:6 or GALFLGFLGAAGSTMGAWSQPKKKRKV; SEQ ID NO:7).
  • the cell-penetrating domain can be Pep-1 (KETWWETWWTEWSQPKKKRKV; SEQ ID NO:8), VP22, a cell penetrating peptide from Herpes simplex virus, or a polyarginine peptide sequence.
  • the cell-penetrating domain can be located at the N-terminus, the C-terminus, or in an internal location of the protein.
  • the RNA-guided endonuclease can also comprise at least one marker domain.
  • marker domains include fluorescent proteins, purification tags, and epitope tags.
  • the marker domain can be a fluorescent protein.
  • suitable fluorescent proteins include green fluorescent proteins (e.g., GFP, GFP-2, tagGFP, turboGFP, EGFP, Emerald, Azami Green, Monomeric Azami Green, CopGFP, AceGFP, ZsGreen1), yellow fluorescent proteins (e.g. YFP, EYFP, Citrine, Venus, YPet, PhiYFP, ZsYellow1), blue fluorescent proteins (e.g.
  • EBFP EBFP2, Azurite, mKalama1, GFPuv, Sapphire, T-sapphire), cyan fluorescent proteins (e.g. ECFP, Cerulean, CyPet, AmCyan1, Midoriishi-Cyan), red fluorescent proteins (mKate, mKate2, mPlum, DsRed monomer, mCherry, mRFP1, DsRed-Express, DsRed2, DsRed-Monomer, HcRed-Tandem, HcRed1, AsRed2, eqFP611, mRasberry, mStrawberry, Jred), and orange fluorescent proteins (mOrange, mKO, Kusabira-Orange, Monomeric Kusabira-Orange, mTangerine, tdTomato) or any other suitable fluorescent protein.
  • cyan fluorescent proteins e.g. ECFP, Cerulean, CyPet, AmCyan1, Midoriishi-C
  • the marker domain can be a purification tag and/or an epitope tag.
  • tags include, but are not limited to, glutathione-S-transferase (GST), chitin binding protein (CBP), maltose binding protein, thioredoxin (TRX), poly(NANP), tandem affinity purification (TAP) tag, myc, AcV5, AU1, AU5, E, ECS, E2, FLAG, HA, nus, Softag 1, Softag 3, Strep, SBP, Glu-Glu, HSV, KT3, S, S1, T7, V5, VSV-G, 6 ⁇ His, biotin carboxyl carrier protein (BCCP), and calmodulin.
  • GST glutathione-S-transferase
  • CBP chitin binding protein
  • TRX thioredoxin
  • poly(NANP) poly(NANP)
  • TAP tandem affinity purification
  • the RNA-guided endonuclease may be part of a protein-RNA complex comprising a guide RNA.
  • the guide RNA interacts with the RNA-guided endonuclease to direct the endonuclease to a specific target site, wherein the 5′ end of the guide RNA base pairs with a specific protospacer sequence.
  • a fusion protein comprising a CRISPR/Cas-like protein or fragment thereof and an effector domain.
  • the CRISPR/Cas-like protein is directed to a target site by a guide RNA, at which site the effector domain can modify or effect the targeted nucleic acid sequence.
  • the effector domain can be a cleavage domain, an epigenetic modification domain, a transcriptional activation domain, or a transcriptional repressor domain.
  • the fusion protein can further comprise at least one additional domain chosen from a nuclear localization signal, a cell-penetrating domain, or a marker domain.
  • the fusion protein comprises a CRISPR/Cas-like protein or a fragment thereof.
  • CRISPR/Cas-like proteins are detailed above in section (I).
  • the CRISPR/Cas-like protein can be located at the N-terminus, the C-terminus, or in an internal location of the fusion protein
  • the CRISPR/Cas-like protein of the fusion protein can be derived from a Cas9 protein.
  • the Cas9-derived protein can be wild type, modified, or a fragment thereof.
  • the Cas9-derived protein can be modified to contain only one functional nuclease domain (either a RuvC-like or a HNH-like nuclease domain).
  • the Cas9-derived protein can be modified such that one of the nuclease domains is deleted or mutated such that it is no longer functional (i.e., the nuclease activity is absent).
  • the Cas9-derived protein is able to introduce a nick into a double-stranded nucleic acid (such protein is termed a “nickase”), but not cleave the double-stranded DNA.
  • a nickase such protein is termed a “nickase”
  • an aspartate to alanine (D10A) conversion in a RuvC-like domain converts the Cas9-derived protein into a nickase.
  • a histidine to alanine (H840A or H839A) conversion in a HNH domain converts the Cas9-derived protein into a nickase.
  • both of the RuvC-like nuclease domain and the HNH-like nuclease domain can be modified or eliminated such that the Cas9-derived protein is unable to nick or cleave double stranded nucleic acid.
  • all nuclease domains of the Cas9-derived protein can be modified or eliminated such that the Cas9-derived protein lacks all nuclease activity.
  • any or all of the nuclease domains can be inactivated by one or more deletion mutations, insertion mutations, and/or substitution mutations using well-known methods, such as site-directed mutagenesis, PCR-mediated mutagenesis, and total gene synthesis, as well as other methods known in the art.
  • the CRISPR/Cas-like protein of the fusion protein is derived from a Cas9 protein in which all the nuclease domains have been inactivated or deleted.
  • the fusion protein also comprises an effector domain.
  • the effector domain can be a cleavage domain, an epigenetic modification domain, a transcriptional activation domain, or a transcriptional repressor domain.
  • the effector domain can be located at the N-terminus, the C-terminus, or in an internal location of the fusion protein.
  • the effector domain is a cleavage domain.
  • a “cleavage domain” refers to a domain that cleaves DNA.
  • the cleavage domain can be obtained from any endonuclease or exonuclease.
  • Non-limiting examples of endonucleases from which a cleavage domain can be derived include, but are not limited to, restriction endonucleases and homing endonucleases. See, for example, New England Biolabs Catalog or Belfort et al. (1997) Nucleic Acids Res. 25:3379-3388.
  • cleave DNA e.g., S1 Nuclease; mung bean nuclease; pancreatic DNase I; micrococcal nuclease; yeast HO endonuclease. See also Linn et al. (eds.) Nucleases, Cold Spring Harbor Laboratory Press, 1993. One or more of these enzymes (or functional fragments thereof) can be used as a source of cleavage domains.
  • the cleavage domain can be derived from a type II-S endonuclease.
  • Type II-S endonucleases cleave DNA at sites that are typically several base pairs away the recognition site and, as such, have separable recognition and cleavage domains. These enzymes generally are monomers that transiently associate to form dimers to cleave each strand of DNA at staggered locations.
  • suitable type II-S endonucleases include BfiI, BpmI, BsaI, BsgI, BsmBI, BsmI, BspMI, FokI, MbolI, and SapI.
  • the cleavage domain of the fusion protein is a FokI cleavage domain or a derivative thereof.
  • the type II-S cleavage can be modified to facilitate dimerization of two different cleavage domains (each of which is attached to a CRISPR/Cas-like protein or fragment thereof).
  • the cleavage domain of FokI can be modified by mutating certain amino acid residues.
  • amino acid residues at positions 446, 447, 479, 483, 484, 486, 487, 490, 491, 496, 498, 499, 500, 531, 534, 537, and 538 of FokI cleavage domains are targets for modification.
  • modified cleavage domains of FokI that form obligate heterodimers include a pair in which a first modified cleavage domain includes mutations at amino acid positions 490 and 538 and a second modified cleavage domain that includes mutations at amino acid positions 486 and 499 (Miller et al., 2007, Nat. Biotechnol, 25:778-785; Szczpek et al., 2007, Nat. Biotechnol, 25:786-793).
  • modified FokI cleavage domains can include three amino acid changes (Doyon et al. 2011, Nat. Methods, 8:74-81).
  • one modified FokI domain (which is termed ELD) can comprise Q486E, I499L, N496D mutations and the other modified FokI domain (which is termed KKR) can comprise E490K, I538K, H537R mutations.
  • the effector domain of the fusion protein is a FokI cleavage domain or a modified FokI cleavage domain.
  • the Cas9-derived can be modified as discussed herein such that its endonuclease activity is eliminated.
  • the Cas9-derived can be modified by mutating the RuvC and HNH domains such that they no longer possess nuclease activity.
  • the effector domain of the fusion protein can be an epigenetic modification domain.
  • epigenetic modification domains alter histone structure and/or chromosomal structure without altering the DNA sequence. Changes histone and/or chromatin structure can lead to changes in gene expression. Examples of epigenetic modification include, without limit, acetylation or methylation of lysine residues in histone proteins, and methylation of cytosine residues in DNA.
  • Non-limiting examples of suitable epigenetic modification domains include histone acetyltansferase domains, histone deacetylase domains, histone methyltransferase domains, histone demethylase domains, DNA methyltransferase domains, and DNA demethylase domains.
  • the HAT domain can be derived from EP300 (i.e., E1A binding protein p300), CREBBP (i.e., CREB-binding protein), CDY1, CDY2, CDYL1, CLOCK, ELP3, ESA1, GCN5 (KAT2A), HAT1, KAT2B, KAT5, MYST1, MYST2, MYST3, MYST4, NCOA1, NCOA2, NCOA3, NCOAT, P/CAF, Tip60, TAFII250, or TF3C4.
  • the HAT domain is p300
  • the Cas9-derived can be modified as discussed herein such that its endonuclease activity is eliminated.
  • the Cas9-derived can be modified by mutating the RuvC and HNH domains such that they no longer possess nuclease activity.
  • the effector domain of the fusion protein can be a transcriptional activation domain.
  • a transcriptional activation domain interacts with transcriptional control elements and/or transcriptional regulatory proteins (i.e., transcription factors, RNA polymerases, etc.) to increase and/or activate transcription of a gene.
  • the transcriptional activation domain can be, without limit, a herpes simplex virus VP16 activation domain, VP64 (which is a tetrameric derivative of VP16), a NF ⁇ B p65 activation domain, p53 activation domains 1 and 2, a CREB (cAMP response element binding protein) activation domain, an E2A activation domain, and an NFAT (nuclear factor of activated T-cells) activation domain.
  • the transcriptional activation domain can be Gal4, Gcn4, MLL, Rtg3, Gln3, Oaf1, Pip2, Pdr1, Pdr3, Pho4, and Leu3.
  • the transcriptional activation domain may be wild type, or it may be a modified version of the original transcriptional activation domain.
  • the effector domain of the fusion protein is a VP16 or VP64 transcriptional activation domain.
  • the Cas9-derived protein can be modified as discussed herein such that its endonuclease activity is eliminated.
  • the Cas9-derived can be modified by mutating the RuvC and HNH domains such that they no longer possess nuclease activity.
  • the effector domain of the fusion protein can be a transcriptional repressor domain.
  • a transcriptional repressor domain interacts with transcriptional control elements and/or transcriptional regulatory proteins (i.e., transcription factors, RNA polymerases, etc.) to decrease and/or terminate transcription of a gene.
  • transcriptional repressor domains include inducible cAMP early repressor (ICER) domains, Kruppel-associated box A (KRAB-A) repressor domains, YY1 glycine rich repressor domains, Sp1-like repressors, E(spl) repressors, I ⁇ B repressor, and MeCP2.
  • the Cas9-derived protein can be modified as discussed herein such that its endonuclease activity is eliminated.
  • the cas9 can be modified by mutating the RuvC and HNH domains such that they no longer possess nuclease activity.
  • the fusion protein further comprises at least one additional domain.
  • suitable additional domains include nuclear localization signals, cell-penetrating or translocation domains, and marker domains.
  • suitable nuclear localization signals, cell-penetrating domains, and marker domains are presented above in section (I).
  • a dimer comprising at least one fusion protein can form.
  • the dimer can be a homodimer or a heterodimer.
  • the heterodimer comprises two different fusion proteins.
  • the heterodimer comprises one fusion protein and an additional protein.
  • the dimer is a homodimer in which the two fusion protein monomers are identical with respect to the primary amino acid sequence.
  • the Cas9-derived proteins are modified such that their endonuclease activity is eliminated, i.e., such that they have no functional nuclease domains.
  • each fusion protein monomer comprises an identical Cas9 like protein and an identical cleavage domain.
  • the cleavage domain can be any cleavage domain, such as any of the exemplary cleavage domains provided herein.
  • the cleavage domain is a FokI cleavage domain or a modified FokI cleavage domain.
  • specific guide RNAs would direct the fusion protein monomers to different but closely adjacent sites such that, upon dimer formation, the nuclease domains of the two monomers would create a double stranded break in the target DNA.
  • the dimer is a heterodimer of two different fusion proteins.
  • the CRISPR/Cas-like protein of each fusion protein can be derived from a different CRISPR/Cas protein or from an orthologous CRISPR/Cas protein from a different bacterial species.
  • each fusion protein can comprise a Cas9-like protein, which Cas9-like protein is derived from a different bacterial species.
  • each fusion protein would recognize a different target site (i.e., specified by the protospacer and/or PAM sequence).
  • the guide RNAs could position the heterodimer to different but closely adjacent sites such that their nuclease domains results in an effective double stranded break in the target DNA.
  • the heterodimer can also have modified Cas9 proteins with nicking activity such that the nicking locations are different.
  • two fusion proteins of a heterodimer can have different effector domains.
  • each fusion protein can contain a different modified cleavage domain.
  • each fusion protein can contain a different modified FokI cleavage domain, as detailed above in section (II)(b)(i).
  • the Cas-9 proteins can be modified such that their endonuclease activities are eliminated.
  • the two fusion proteins forming a heterodimer can differ in both the CRISPR/Cas-like protein domain and the effector domain.
  • the homodimer or heterodimer can comprise at least one additional domain chosen from nuclear localization signals (NLSs), cell-penetrating, translocation domains and marker domains, as detailed above.
  • NLSs nuclear localization signals
  • cell-penetrating cell-penetrating
  • translocation domains translocation domains
  • marker domains marker domains
  • one or both of the Cas9-derived proteins can be modified such that its endonuclease activity is eliminated or modified.
  • the heterodimer comprises one fusion protein and an additional protein.
  • the additional protein can be a nuclease.
  • the nuclease is a zinc finger nuclease.
  • a zinc finger nuclease comprises a zinc finger DNA binding domain and a cleavage domain.
  • a zinc finger recognizes and binds three (3) nucleotides.
  • a zinc finger DNA binding domain can comprise from about three zinc fingers to about seven zinc fingers.
  • the zinc finger DNA binding domain can be derived from a naturally occurring protein or it can be engineered. See, for example, Beerli et al. (2002) Nat. Biotechnol. 20:135-141; Pabo et al. (2001) Ann. Rev. Biochem.
  • the cleavage domain of the zinc finger nuclease can be any cleavage domain detailed above in section (II)(b)(i).
  • the cleavage domain of the zinc finger nuclease is a FokI cleavage domain or a modified FokI cleavage domain.
  • Such a zinc finger nuclease will dimerize with a fusion protein comprising a FokI cleavage domain or a modified FokI cleavage domain.
  • the zinc finger nuclease can comprise at least one additional domain chosen from nuclear localization signals, cell-penetrating or translocation domains, which are detailed above.
  • any of the fusion protein detailed above or a dimer comprising at least one fusion protein may be part of a protein-RNA complex comprising at least one guide RNA.
  • a guide RNA interacts with the CRISPR-Cas0 like protein of the fusion protein to direct the fusion protein to a specific target site, wherein the 5′ end of the guide RNA base pairs with a specific protospacer sequence.
  • nucleic acids encoding any of the RNA-guided endonucleases or fusion proteins described above in sections (I) and (II), respectively.
  • the nucleic acid can be RNA or DNA.
  • the nucleic acid encoding the RNA-guided endonuclease or fusion protein is mRNA.
  • the mRNA can be 5′ capped and/or 3′ polyadenylated.
  • the nucleic acid encoding the RNA-guided endonuclease or fusion protein is DNA.
  • the DNA can be present in a vector (see below).
  • the nucleic acid encoding the RNA-guided endonuclease or fusion protein can be codon optimized for efficient translation into protein in the eukaryotic cell or animal of interest.
  • codons can be optimized for expression in humans, mice, rats, hamsters, cows, pigs, cats, dogs, fish, amphibians, plants, yeast, insects, and so forth (see Codon Usage Database at www.kazusa.or.jp/codon/).
  • Programs for codon optimization are available as freeware (e.g., OPTIMIZER at genomes.urv.es/OPTIMIZER; OptimumGeneTM from GenScript at www.genscript.com/codon_opt.html).
  • Commercial codon optimization programs are also available.
  • DNA encoding the RNA-guided endonuclease or fusion protein can be operably linked to at least one promoter control sequence.
  • the DNA coding sequence can be operably linked to a promoter control sequence for expression in the eukaryotic cell or animal of interest.
  • the promoter control sequence can be constitutive, regulated, or tissue-specific.
  • Suitable constitutive promoter control sequences include, but are not limited to, cytomegalovirus immediate early promoter (CMV), simian virus (SV40) promoter, adenovirus major late promoter, Rous sarcoma virus (RSV) promoter, mouse mammary tumor virus (MMTV) promoter, phosphoglycerate kinase (PGK) promoter, elongation factor (ED1)-alpha promoter, ubiquitin promoters, actin promoters, tubulin promoters, immunoglobulin promoters, fragments thereof, or combinations of any of the foregoing.
  • suitable regulated promoter control sequences include without limit those regulated by heat shock, metals, steroids, antibiotics, or alcohol.
  • tissue-specific promoters include B29 promoter, CD14 promoter, CD43 promoter, CD45 promoter, CD68 promoter, desmin promoter, elastase-1 promoter, endoglin promoter, fibronectin promoter, Flt-1 promoter, GFAP promoter, GPIIb promoter, ICAM-2 promoter, INF- ⁇ promoter, Mb promoter, NphsI promoter, 00-2 promoter, SP-B promoter, SYN1 promoter, and WASP promoter.
  • the promoter sequence can be wild type or it can be modified for more efficient or efficacious expression.
  • the encoding DNA can be operably linked to a CMV promoter for constitutive expression in mammalian cells.
  • the sequence encoding the RNA-guided endonuclease or fusion protein can be operably linked to a promoter sequence that is recognized by a phage RNA polymerase for in vitro mRNA synthesis.
  • the in vitro-transcribed RNA can be purified for use in the methods detailed below in sections (IV) and (V).
  • the promoter sequence can be a T7, T3, or SP6 promoter sequence or a variation of a T7, T3, or SP6 promoter sequence.
  • the DNA encoding the fusion protein is operably linked to a T7 promoter for in vitro mRNA synthesis using T7 RNA polymerase.
  • the sequence encoding the RNA-guided endonuclease or fusion protein can be operably linked to a promoter sequence for in vitro expression of the RNA-guided endonuclease or fusion protein in bacterial or eukaryotic cells.
  • the expressed protein can be purified for use in the methods detailed below in sections (IV) and (V).
  • Suitable bacterial promoters include, without limit, T7 promoters, lac operon promoters, trp promoters, variations thereof, and combinations thereof.
  • An exemplary bacterial promoter is tac which is a hybrid of trp and lac promoters.
  • suitable eukaryotic promoters are listed above.
  • the DNA encoding the RNA-guided endonuclease or fusion protein also can be linked to a polyadenylation signal (e.g., SV40 polyA signal, bovine growth hormone (BGH) polyA signal, etc.) and/or at least one transcriptional termination sequence.
  • a polyadenylation signal e.g., SV40 polyA signal, bovine growth hormone (BGH) polyA signal, etc.
  • BGH bovine growth hormone
  • the sequence encoding the RNA-guided endonuclease or fusion protein also can be linked to sequence encoding at least one nuclear localization signal, at least one cell-penetrating domain, and/or at least one marker domain, which are detailed above in section (I).
  • the DNA encoding the RNA-guided endonuclease or fusion protein can be present in a vector.
  • Suitable vectors include plasmid vectors, phagemids, cosmids, artificial/mini-chromosomes, transposons, and viral vectors (e.g., lentiviral vectors, adeno-associated viral vectors, etc.).
  • the DNA encoding the RNA-guided endonuclease or fusion protein is present in a plasmid vector.
  • suitable plasmid vectors include pUC, pBR322, pET, pBluescript, and variants thereof.
  • the vector can comprise additional expression control sequences (e.g., enhancer sequences, Kozak sequences, polyadenylation sequences, transcriptional termination sequences, etc.), selectable marker sequences (e.g., antibiotic resistance genes), origins of replication, and the like. Additional information can be found in “Current Protocols in Molecular Biology” Ausubel et al., John Wiley & Sons, New York, 2003 or “Molecular Cloning: A Laboratory Manual” Sambrook & Russell, Cold Spring Harbor Press, Cold Spring Harbor, N.Y., 3 rd edition, 2001.
  • additional expression control sequences e.g., enhancer sequences, Kozak sequences, polyadenylation sequences, transcriptional termination sequences, etc.
  • selectable marker sequences e.g., antibiotic resistance genes
  • the expression vector comprising the sequence encoding the RNA-guided endonuclease or fusion protein can further comprise sequence encoding a guide RNA.
  • the sequence encoding the guide RNA generally is operably linked to at least one transcriptional control sequence for expression of the guide RNA in the cell or embryo of interest.
  • DNA encoding the guide RNA can be operably linked to a promoter sequence that is recognized by RNA polymerase III (Pol III).
  • Pol III RNA polymerase III
  • suitable Pol III promoters include, but are not limited to, mammalian U6, U3, H1, and 7SL RNA promoters.
  • Another aspect of the present disclosure encompasses a method for modifying a chromosomal sequence in a eukaryotic cell or embryo.
  • the method comprises introducing into a eukaryotic cell or embryo (i) at least one RNA-guided endonuclease comprising at least one nuclear localization signal or nucleic acid encoding at least one RNA-guided endonuclease comprising at least one nuclear localization signal, (ii) at least one guide RNA or DNA encoding at least one guide RNA, and, optionally, (iii) at least one donor polynucleotide comprising a donor sequence.
  • the method further comprises culturing the cell or embryo such that each guide RNA directs an RNA-guided endonuclease to a targeted site in the chromosomal sequence where the RNA-guided endonuclease introduces a double-stranded break in the targeted site, and the double-stranded break is repaired by a DNA repair process such that the chromosomal sequence is modified.
  • the method can comprise introducing one RNA-guided endonuclease (or encoding nucleic acid) and one guide RNA (or encoding DNA) into a cell or embryo, wherein the RNA-guided endonuclease introduces one double-stranded break in the targeted chromosomal sequence.
  • the double-stranded break in the chromosomal sequence can be repaired by a non-homologous end-joining (NHEJ) repair process.
  • NHEJ non-homologous end-joining
  • the targeted chromosomal sequence can be modified or inactivated.
  • a single nucleotide change can give rise to an altered protein product, or a shift in the reading frame of a coding sequence can inactivate or “knock out” the sequence such that no protein product is made.
  • the donor sequence in the donor polynucleotide can be exchanged with or integrated into the chromosomal sequence at the targeted site during repair of the double-stranded break.
  • the donor sequence in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted site in the chromosomal sequence, the donor sequence can be exchanged with or integrated into the chromosomal sequence at the targeted site during repair mediated by homology-directed repair process.
  • the donor sequence can be ligated directly with the cleaved chromosomal sequence by a non-homologous repair process during repair of the double-stranded break.
  • Exchange or integration of the donor sequence into the chromosomal sequence modifies the targeted chromosomal sequence or introduces an exogenous sequence into the chromosomal sequence of the cell or embryo.
  • the method can comprise introducing two RNA-guided endonucleases (or encoding nucleic acid) and two guide RNAs (or encoding DNA) into a cell or embryo, wherein the RNA-guided endonucleases introduce two double-stranded breaks in the chromosomal sequence. See FIG. 3B .
  • the two breaks can be within several base pairs, within tens of base pairs, or can be separated by many thousands of base pairs.
  • the resultant double-stranded breaks can be repaired by a non-homologous repair process such that the sequence between the two cleavage sites is lost and/or deletions of at least one nucleotide, insertions of at least one nucleotide, substitutions of at least one nucleotide, or combinations thereof can occur during the repair of the break(s).
  • the donor sequence in the donor polynucleotide can be exchanged with or integrated into the chromosomal sequence during repair of the double-stranded breaks by either a homology-based repair process (e.g., in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted sites in the chromosomal sequence) or a non-homologous repair process (e.g., in embodiments in which the donor sequence is flanked by compatible overhangs).
  • a homology-based repair process e.g., in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted sites in the chromosomal sequence
  • a non-homologous repair process e.g., in embodiments in which the donor sequence is flanked by compatible overhangs.
  • the method can comprise introducing one RNA-guided endonuclease modified to cleave one strand of a double-stranded sequence (or encoding nucleic acid) and two guide RNAs (or encoding DNA) into a cell or embryo, wherein each guide RNA directs the RNA-guided endonuclease to a specific target site, at which site the modified endonuclease cleaves one strand (i.e., nicks) of the double-stranded chromosomal sequence, and wherein the two nicks are in opposite stands and in close enough proximity to constitute a double-stranded break. See FIG. 3A .
  • the resultant double-stranded break can be repaired by a non-homologous repair process such that deletions of at least one nucleotide, insertions of at least one nucleotide, substitutions of at least one nucleotide, or combinations thereof can occur during the repair of the break.
  • the donor sequence in the donor polynucleotide can be exchanged with or integrated into the chromosomal sequence during repair of the double-stranded break by either a homology-based repair process (e.g., in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted sites in the chromosomal sequence) or a non-homologous repair process (e.g., in embodiments in which the donor sequence is flanked by compatible overhangs).
  • a homology-based repair process e.g., in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted sites in the chromosomal sequence
  • a non-homologous repair process e.g., in embodiments in which the donor sequence is flanked by compatible overhangs.
  • the method comprises introducing into a cell or embryo at least one RNA-guided endonuclease comprising at least one nuclear localization signal or nucleic acid encoding at least one RNA-guided endonuclease comprising at least one nuclear localization signal.
  • RNA-guided endonucleases and nucleic acids encoding RNA-guided endonucleases are described above in sections (I) and (III), respectively.
  • the RNA-guided endonuclease can be introduced into the cell or embryo as an isolated protein. In such embodiments, the RNA-guided endonuclease can further comprise at least one cell-penetrating domain, which facilitates cellular uptake of the protein. In other embodiments, the RNA-guided endonuclease can be introduced into the cell or embryo as an mRNA molecule. In still other embodiments, the RNA-guided endonuclease can be introduced into the cell or embryo as a DNA molecule. In general, DNA sequence encoding the fusion protein is operably linked to a promoter sequence that will function in the cell or embryo of interest. The DNA sequence can be linear, or the DNA sequence can be part of a vector. In still other embodiments, the fusion protein can be introduced into the cell or embryo as an RNA-protein complex comprising the fusion protein and the guide RNA.
  • DNA encoding the RNA-guided endonuclease can further comprise sequence encoding a guide RNA.
  • each of the sequences encoding the RNA-guided endonuclease and the guide RNA is operably linked to appropriate promoter control sequence that allows expression of the RNA-guided endonuclease and the guide RNA, respectively, in the cell or embryo.
  • the DNA sequence encoding the RNA-guided endonuclease and the guide RNA can further comprise additional expression control, regulatory, and/or processing sequence(s).
  • the DNA sequence encoding the RNA-guided endonuclease and the guide RNA can be linear or can be part of a vector
  • the method also comprises introducing into a cell or embryo at least one guide RNA or DNA encoding at least one guide RNA.
  • a guide RNA interacts with the RNA-guided endonuclease to direct the endonuclease to a specific target site, at which site the 5′ end of the guide RNA base pairs with a specific protospacer sequence in the chromosomal sequence.
  • Each guide RNA comprises three regions: a first region at the 5′ end that is complementary to the target site in the chromosomal sequence, a second internal region that forms a stem loop structure, and a third 3′ region that remains essentially single-stranded.
  • the first region of each guide RNA is different such that each guide RNA guides a fusion protein to a specific target site.
  • the second and third regions of each guide RNA can be the same in all guide RNAs.
  • the first region of the guide RNA is complementary to sequence (i.e., protospacer sequence) at the target site in the chromosomal sequence such that the first region of the guide RNA can base pair with the target site.
  • the first region of the guide RNA can comprise from about 10 nucleotides to more than about 25 nucleotides.
  • the region of base pairing between the first region of the guide RNA and the target site in the chromosomal sequence can be about 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, or more than 25 nucleotides in length.
  • the first region of the guide RNA is about 19, 20, or 21 nucleotides in length.
  • the guide RNA also comprises a second region that forms a secondary structure.
  • the secondary structure comprises a stem (or hairpin) and a loop.
  • the length of the loop and the stem can vary.
  • the loop can range from about 3 to about 10 nucleotides in length
  • the stem can range from about 6 to about 20 base pairs in length.
  • the stem can comprise one or more bulges of 1 to about 10 nucleotides.
  • the overall length of the second region can range from about 16 to about 60 nucleotides in length.
  • the loop is about 4 nucleotides in length and the stem comprises about 12 base pairs.
  • the guide RNA also comprises a third region at the 3′ end that remains essentially single-stranded.
  • the third region has no complementarity to any chromosomal sequence in the cell of interest and has no complementarity to the rest of the guide RNA.
  • the length of the third region can vary. In general, the third region is more than about 4 nucleotides in length. For example, the length of the third region can range from about 5 to about 60 nucleotides in length.
  • the combined length of the second and third regions (also called the universal or scaffold region) of the guide RNA can range from about 30 to about 120 nucleotides in length. In one aspect, the combined length of the second and third regions of the guide RNA range from about 70 to about 100 nucleotides in length.
  • the guide RNA comprises a single molecule comprising all three regions.
  • the guide RNA can comprise two separate molecules.
  • the first RNA molecule can comprise the first region of the guide RNA and one half of the “stem” of the second region of the guide RNA.
  • the second RNA molecule can comprise the other half of the “stem” of the second region of the guide RNA and the third region of the guide RNA.
  • the first and second RNA molecules each contain a sequence of nucleotides that are complementary to one another.
  • the first and second RNA molecules each comprise a sequence (of about 6 to about 20 nucleotides) that base pairs to the other sequence to form a functional guide RNA.
  • the guide RNA can be introduced into the cell or embryo as a RNA molecule.
  • the RNA molecule can be transcribed in vitro.
  • the RNA molecule can be chemically synthesized.
  • the guide RNA can be introduced into the cell or embryo as a DNA molecule.
  • the DNA encoding the guide RNA can be operably linked to promoter control sequence for expression of the guide RNA in the cell or embryo of interest.
  • the RNA coding sequence can be operably linked to a promoter sequence that is recognized by RNA polymerase III (Pol III).
  • Pol III RNA polymerase III
  • suitable Pol III promoters include, but are not limited to, mammalian U6 or H1 promoters.
  • the RNA coding sequence is linked to a mouse or human U6 promoter.
  • the RNA coding sequence is linked to a mouse or human H1 promoter.
  • the DNA molecule encoding the guide RNA can be linear or circular.
  • the DNA sequence encoding the guide RNA can be part of a vector.
  • Suitable vectors include plasmid vectors, phagemids, cosmids, artificial/mini-chromosomes, transposons, and viral vectors.
  • the DNA encoding the RNA-guided endonuclease is present in a plasmid vector.
  • suitable plasmid vectors include pUC, pBR322, pET, pBluescript, and variants thereof.
  • the vector can comprise additional expression control sequences (e.g., enhancer sequences, Kozak sequences, polyadenylation sequences, transcriptional termination sequences, etc.), selectable marker sequences (e.g., antibiotic resistance genes), origins of replication, and the like.
  • additional expression control sequences e.g., enhancer sequences, Kozak sequences, polyadenylation sequences, transcriptional termination sequences, etc.
  • selectable marker sequences e.g., antibiotic resistance genes
  • each can be part of a separate molecule (e.g., one vector containing fusion protein coding sequence and a second vector containing guide RNA coding sequence) or both can be part of the same molecule (e.g., one vector containing coding (and regulatory) sequence for both the fusion protein and the guide RNA).
  • RNA-guided endonuclease in conjunction with a guide RNA is directed to a target site in the chromosomal sequence, wherein the RNA-guided endonuclease introduces a double-stranded break in the chromosomal sequence.
  • the target site has no sequence limitation except that the sequence is immediately followed (downstream) by a consensus sequence.
  • This consensus sequence is also known as a protospacer adjacent motif (PAM).
  • PAM protospacer adjacent motif
  • Examples of PAM include, but are not limited to, NGG, NGGNG, and NNAGAAW (wherein N is defined as any nucleotide and W is defined as either A or T).
  • the first region (at the 5′ end) of the guide RNA is complementary to the protospacer of the target sequence.
  • the first region of the guide RNA is about 19 to 21 nucleotides in length.
  • the sequence of the target site in the chromosomal sequence is 5′-N 19-21 -NGG-3′.
  • the PAM is in italics.
  • the target site can be in the coding region of a gene, in an intron of a gene, in a control region of a gene, in a non-coding region between genes, etc.
  • the gene can be a protein coding gene or an RNA coding gene.
  • the gene can be any gene of interest.
  • the method further comprises introducing at least one donor polynucleotide into the embryo.
  • a donor polynucleotide comprises at least one donor sequence.
  • a donor sequence of the donor polynucleotide corresponds to an endogenous or native chromosomal sequence.
  • the donor sequence can be essentially identical to a portion of the chromosomal sequence at or near the targeted site, but which comprises at least one nucleotide change.
  • the donor sequence can comprise a modified version of the wild type sequence at the targeted site such that, upon integration or exchange with the native sequence, the sequence at the targeted chromosomal location comprises at least one nucleotide change.
  • the change can be an insertion of one or more nucleotides, a deletion of one or more nucleotides, a substitution of one or more nucleotides, or combinations thereof.
  • the cell or embryo/animal can produce a modified gene product from the targeted chromosomal sequence.
  • the donor sequence of the donor polynucleotide corresponds to an exogenous sequence.
  • an “exogenous” sequence refers to a sequence that is not native to the cell or embryo, or a sequence whose native location in the genome of the cell or embryo is in a different location.
  • the exogenous sequence can comprise protein coding sequence, which can be operably linked to an exogenous promoter control sequence such that, upon integration into the genome, the cell or embryo/animal is able to express the protein coded by the integrated sequence.
  • the exogenous sequence can be integrated into the chromosomal sequence such that its expression is regulated by an endogenous promoter control sequence.
  • the exogenous sequence can be a transcriptional control sequence, another expression control sequence, an RNA coding sequence, and so forth. Integration of an exogenous sequence into a chromosomal sequence is termed a “knock in.”
  • the length of the donor sequence can and will vary.
  • the donor sequence can vary in length from several nucleotides to hundreds of nucleotides to hundreds of thousands of nucleotides.
  • the donor sequence in the donor polynucleotide is flanked by an upstream sequence and a downstream sequence, which have substantial sequence identity to sequences located upstream and downstream, respectively, of the targeted site in the chromosomal sequence. Because of these sequence similarities, the upstream and downstream sequences of the donor polynucleotide permit homologous recombination between the donor polynucleotide and the targeted chromosomal sequence such that the donor sequence can be integrated into (or exchanged with) the chromosomal sequence.
  • the upstream sequence refers to a nucleic acid sequence that shares substantial sequence identity with a chromosomal sequence upstream of the targeted site.
  • the downstream sequence refers to a nucleic acid sequence that shares substantial sequence identity with a chromosomal sequence downstream of the targeted site.
  • the phrase “substantial sequence identity” refers to sequences having at least about 75% sequence identity.
  • the upstream and downstream sequences in the donor polynucleotide can have about 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity with sequence upstream or downstream to the targeted site.
  • the upstream and downstream sequences in the donor polynucleotide can have about 95% or 100% sequence identity with chromosomal sequences upstream or downstream to the targeted site.
  • the upstream sequence shares substantial sequence identity with a chromosomal sequence located immediately upstream of the targeted site (i.e., adjacent to the targeted site). In other embodiments, the upstream sequence shares substantial sequence identity with a chromosomal sequence that is located within about one hundred (100) nucleotides upstream from the targeted site. Thus, for example, the upstream sequence can share substantial sequence identity with a chromosomal sequence that is located about 1 to about 20, about 21 to about 40, about 41 to about 60, about 61 to about 80, or about 81 to about 100 nucleotides upstream from the targeted site.
  • the downstream sequence shares substantial sequence identity with a chromosomal sequence located immediately downstream of the targeted site (i.e., adjacent to the targeted site). In other embodiments, the downstream sequence shares substantial sequence identity with a chromosomal sequence that is located within about one hundred (100) nucleotides downstream from the targeted site. Thus, for example, the downstream sequence can share substantial sequence identity with a chromosomal sequence that is located about 1 to about 20, about 21 to about 40, about 41 to about 60, about 61 to about 80, or about 81 to about 100 nucleotides downstream from the targeted site.
  • Each upstream or downstream sequence can range in length from about 20 nucleotides to about 5000 nucleotides.
  • upstream and downstream sequences can comprise about 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2800, 3000, 3200, 3400, 3600, 3800, 4000, 4200, 4400, 4600, 4800, or 5000 nucleotides.
  • upstream and downstream sequences can range in length from about 50 to about 1500 nucleotides.
  • Donor polynucleotides comprising the upstream and downstream sequences with sequence similarity to the targeted chromosomal sequence can be linear or circular.
  • the donor polynucleotide can be part of a vector.
  • the vector can be a plasmid vector.
  • the donor polynucleotide can additionally comprise at least one targeted cleavage site that is recognized by the RNA-guided endonuclease.
  • the targeted cleavage site added to the donor polynucleotide can be placed upstream or downstream or both upstream and downstream of the donor sequence.
  • the donor sequence can be flanked by targeted cleavage sites such that, upon cleavage by the RNA-guided endonuclease, the donor sequence is flanked by overhangs that are compatible with those in the chromosomal sequence generated upon cleavage by the RNA-guided endonuclease.
  • the donor sequence can be ligated with the cleaved chromosomal sequence during repair of the double stranded break by a non-homologous repair process.
  • donor polynucleotides comprising the targeted cleavage site(s) will be circular (e.g., can be part of a plasmid vector).
  • Donor Polynucleotide Comprising a Short Donor Sequence with Optional Overhangs.
  • the donor polynucleotide can be a linear molecule comprising a short donor sequence with optional short overhangs that are compatible with the overhangs generated by the RNA-guided endonuclease.
  • the donor sequence can be ligated directly with the cleaved chromosomal sequence during repair of the double-stranded break.
  • the donor sequence can be less than about 1,000, less than about 500, less than about 250, or less than about 100 nucleotides.
  • the donor polynucleotide can be a linear molecule comprising a short donor sequence with blunt ends.
  • the donor polynucleotide can be a linear molecule comprising a short donor sequence with 5′ and/or 3′ overhangs.
  • the overhangs can comprise 1, 2, 3, 4, or 5 nucleotides.
  • the donor polynucleotide will be DNA.
  • the DNA may be single-stranded or double-stranded and/or linear or circular.
  • the donor polynucleotide may be a DNA plasmid, a bacterial artificial chromosome (BAC), a yeast artificial chromosome (YAC), a viral vector, a linear piece of DNA, a PCR fragment, a naked nucleic acid, or a nucleic acid complexed with a delivery vehicle such as a liposome or poloxamer.
  • the donor polynucleotide comprising the donor sequence can be part of a plasmid vector. In any of these situations, the donor polynucleotide comprising the donor sequence can further comprise at least one additional sequence.
  • RNA-targeted endonuclease(s) (or encoding nucleic acid), the guide RNA(s) (or encoding DNA), and the optional donor polynucleotide(s) can be introduced into a cell or embryo by a variety of means. In some embodiments, the cell or embryo is transfected.
  • Suitable transfection methods include calcium phosphate-mediated transfection, nucleofection (or electroporation), cationic polymer transfection (e.g., DEAE-dextran or polyethylenimine), viral transduction, virosome transfection, virion transfection, liposome transfection, cationic liposome transfection, immunoliposome transfection, nonliposomal lipid transfection, dendrimer transfection, heat shock transfection, magnetofection, lipofection, gene gun delivery, impalefection, sonoporation, optical transfection, and proprietary agent-enhanced uptake of nucleic acids.
  • nucleofection or electroporation
  • cationic polymer transfection e.g., DEAE-dextran or polyethylenimine
  • viral transduction virosome transfection, virion transfection, liposome transfection, cationic liposome transfection, immunoliposome transfection, nonliposomal lipid transfection, dendrimer transfection, heat shock trans
  • the molecules are introduced into the cell or embryo by microinjection.
  • the embryo is a fertilized one-cell stage embryo of the species of interest.
  • the molecules can be injected into the pronuclei of one cell embryos.
  • RNA-targeted endonuclease(s) (or encoding nucleic acid), the guide RNA(s) (or DNAs encoding the guide RNA), and the optional donor polynucleotide(s) can be introduced into the cell or embryo simultaneously or sequentially.
  • the ratio of the RNA-targeted endonuclease(s) (or encoding nucleic acid) to the guide RNA(s) (or encoding DNA) generally will be about stoichiometric such that they can form an RNA-protein complex.
  • DNA encoding an RNA-targeted endonuclease and DNA encoding a guide RNA are delivered together within the plasmid vector.
  • the method further comprises maintaining the cell or embryo under appropriate conditions such that the guide RNA(s) directs the RNA-guided endonuclease(s) to the targeted site(s) in the chromosomal sequence, and the RNA-guided endonuclease(s) introduce at least one double-stranded break in the chromosomal sequence.
  • a double-stranded break can be repaired by a DNA repair process such that the chromosomal sequence is modified by a deletion of at least one nucleotide, an insertion of at least one nucleotide, a substitution of at least one nucleotide, or a combination thereof.
  • the double-stranded break can be repaired via a non-homologous end-joining (NHEJ) repair process.
  • NHEJ non-homologous end-joining
  • sequence at the chromosomal sequence can be modified such that the reading frame of a coding region can be shifted and that the chromosomal sequence is inactivated or “knocked out.”
  • An inactivated protein-coding chromosomal sequence does not give rise to the protein coded by the wild type chromosomal sequence.
  • the double-stranded break can be repaired by a homology-directed repair (HDR) process such that the donor sequence is integrated into the chromosomal sequence.
  • HDR homology-directed repair
  • an exogenous sequence can be integrated into the genome of the cell or embryo, or the targeted chromosomal sequence can be modified by exchange of a modified sequence for the wild type chromosomal sequence.
  • the RNA-guided endonuclease can cleave both the targeted chromosomal sequence and the donor polynucleotide.
  • the linearized donor polynucleotide can be integrated into the chromosomal sequence at the site of the double-stranded break by ligation between the donor polynucleotide and the cleaved chromosomal sequence via a NHEJ process.
  • the short donor sequence can be integrated into the chromosomal sequence at the site of the double-stranded break via a NHEJ process.
  • the integration can proceed via the ligation of blunt ends between the short donor sequence and the chromosomal sequence at the site of the double stranded break.
  • the integration can proceed via the ligation of sticky ends (i.e., having 5′ or 3′ overhangs) between a short donor sequence that is flanked by overhangs that are compatible with those generated by the RNA-targeting endonuclease in the cleaved chromosomal sequence.
  • the cell is maintained under conditions appropriate for cell growth and/or maintenance. Suitable cell culture conditions are well known in the art and are described, for example, in Santiago et al. (2008) PNAS 105:5809-5814; Moehle et al. (2007) PNAS 104:3055-3060; Urnov et al. (2005) Nature 435:646-651; and Lombardo et al (2007) Nat. Biotechnology 25:1298-1306. Those of skill in the art appreciate that methods for culturing cells are known in the art and can and will vary depending on the cell type. Routine optimization may be used, in all cases, to determine the best techniques for a particular cell type.
  • An embryo can be cultured in vitro (e.g., in cell culture). Typically, the embryo is cultured at an appropriate temperature and in appropriate media with the necessary O 2 /CO 2 ratio to allow the expression of the RNA endonuclease and guide RNA, if necessary. Suitable non-limiting examples of media include M2, M16, KSOM, BMOC, and HTF media. A skilled artisan will appreciate that culture conditions can and will vary depending on the species of embryo. Routine optimization may be used, in all cases, to determine the best culture conditions for a particular species of embryo. In some cases, a cell line may be derived from an in vitro-cultured embryo (e.g., an embryonic stem cell line).
  • an embryo may be cultured in vivo by transferring the embryo into the uterus of a female host.
  • the female host is from the same or similar species as the embryo.
  • the female host is pseudo-pregnant.
  • Methods of preparing pseudo-pregnant female hosts are known in the art.
  • methods of transferring an embryo into a female host are known. Culturing an embryo in vivo permits the embryo to develop and can result in a live birth of an animal derived from the embryo. Such an animal would comprise the modified chromosomal sequence in every cell of the body.
  • the cell can be a human cell, a non-human mammalian cell, a non-mammalian vertebrate cell, an invertebrate cell, an insect cell, a plant cell, a yeast cell, or a single cell eukaryotic organism.
  • the embryo is non-human mammalian embryo.
  • the embryos can be a one cell non-human mammalian embryo.
  • Exemplary mammalian embryos, including one cell embryos include without limit mouse, rat, hamster, rodent, rabbit, feline, canine, ovine, porcine, bovine, equine, and primate embryos.
  • the cell can be a stem cell.
  • Suitable stem cells include without limit embryonic stem cells, ES-like stem cells, fetal stem cells, adult stem cells, pluripotent stem cells, induced pluripotent stem cells, multipotent stem cells, oligopotent stem cells, unipotent stem cells and others.
  • the cell is a mammalian cell.
  • Non-limiting examples of suitable mammalian cells include Chinese hamster ovary (CHO) cells, baby hamster kidney (BHK) cells; mouse myeloma NS0 cells, mouse embryonic fibroblast 3T3 cells (NIH3T3), mouse B lymphoma A20 cells; mouse melanoma B16 cells; mouse myoblast C2C12 cells; mouse myeloma SP2/0 cells; mouse embryonic mesenchymal C3H-10T1/2 cells; mouse carcinoma CT26 cells, mouse prostate DuCuP cells; mouse breast EMT6 cells; mouse hepatoma Hepa1c1c7 cells; mouse myeloma J5582 cells; mouse epithelial MTD-1A cells; mouse myocardial MyEnd cells; mouse renal RenCa cells; mouse pancreatic RIN-5F cells; mouse melanoma X64 cells; mouse lymphoma YAC-1 cells; rat glioblastoma 9 L cells; rat B lymphoma RBL cells;
  • Another aspect of the present disclosure encompasses a method for modifying a chromosomal sequence or regulating expression of a chromosomal sequence in a cell or embryo.
  • the method comprises introducing into the cell or embryo (a) at least one fusion protein or nucleic acid encoding at least one fusion protein, wherein the fusion protein comprises a CRISPR/Cas-like protein or a fragment thereof and an effector domain, and (b) at least one guide RNA or DNA encoding the guide RNA, wherein the guide RNA guides the CRISPR/Cas-like protein of the fusion protein to a targeted site in the chromosomal sequence and the effector domain of the fusion protein modifies the chromosomal sequence or regulates expression of the chromosomal sequence.
  • Fusion proteins comprising a CRISPR/Cas-like protein or a fragment thereof and an effector domain are detailed above in section (II).
  • the fusion proteins disclosed herein further comprise at least one nuclear localization signal.
  • Nucleic acids encoding fusion proteins are described above in section (III).
  • the fusion protein can be introduced into the cell or embryo as an isolated protein (which can further comprise a cell-penetrating domain).
  • the isolated fusion protein can be part of a protein-RNA complex comprising the guide RNA.
  • the fusion protein can be introduced into the cell or embryo as a RNA molecule (which can be capped and/or polyadenylated).
  • the fusion protein can be introduced into the cell or embryo as a DNA molecule.
  • the fusion protein and the guide RNA can be introduced into the cell or embryo as discrete DNA molecules or as part of the same DNA molecule.
  • DNA molecules can be plasmid vectors.
  • the method further comprises introducing into the cell or embryo at least one zinc finger nuclease.
  • Zinc finger nucleases are described above in section (II)(d).
  • the method further comprises introducing into the cell or embryo at least one donor polynucleotide. Donor polynucleotides are detailed above in section (IV)(d). Means for introducing molecules into cells or embryos, as well as means for culturing cell or embryos are described above in sections (IV)(e) and (IV)(f), respectively. Suitable cells and embryos are described above in section (IV)(g).
  • the method can comprise introducing into the cell or embryo one fusion protein (or nucleic acid encoding one fusion protein) and two guide RNAs (or DNA encoding two guide RNAs).
  • the two guide RNAs direct the fusion protein to two different target sites in the chromosomal sequence, wherein the fusion protein dimerizes (e.g., form a homodimer) such that the two cleavage domains can introduce a double stranded break into the chromosomal sequence. See FIG. 1A .
  • the double-stranded break in the chromosomal sequence can be repaired by a non-homologous end-joining (NHEJ) repair process.
  • NHEJ non-homologous end-joining
  • a single nucleotide change can give rise to an altered protein product, or a shift in the reading frame of a coding sequence can inactivate or “knock out” the sequence such that no protein product is made.
  • the donor sequence in the donor polynucleotide can be exchanged with or integrated into the chromosomal sequence at the targeted site during repair of the double-stranded break.
  • the donor sequence in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted site in the chromosomal sequence, the donor sequence can be exchanged with or integrated into the chromosomal sequence at the targeted site during repair mediated by homology-directed repair process.
  • the donor sequence in embodiments in which the donor sequence is flanked by compatible overhangs (or the compatible overhangs are generated in situ by the RNA-guided endonuclease) the donor sequence can be ligated directly with the cleaved chromosomal sequence by a non-homologous repair process during repair of the double-stranded break.
  • Exchange or integration of the donor sequence into the chromosomal sequence modifies the targeted chromosomal sequence or introduces an exogenous sequence into the chromosomal sequence of the cell or embryo.
  • the method can comprise introducing into the cell or embryo two different fusion proteins (or nucleic acid encoding two different fusion proteins) and two guide RNAs (or DNA encoding two guide RNAs).
  • the fusion proteins can differ as detailed above in section (II).
  • Each guide RNA directs a fusion protein to a specific target site in the chromosomal sequence, wherein the fusion proteins dimerize (e.g., form a heterodimer) such that the two cleavage domains can introduce a double stranded break into the chromosomal sequence.
  • the resultant double-stranded breaks can be repaired by a non-homologous repair process such that deletions of at least one nucleotide, insertions of at least one nucleotide, substitutions of at least one nucleotide, or combinations thereof can occur during the repair of the break.
  • the donor sequence in the donor polynucleotide can be exchanged with or integrated into the chromosomal sequence during repair of the double-stranded break by either a homology-based repair process (e.g., in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted sites in the chromosomal sequence) or a non-homologous repair process (e.g., in embodiments in which the donor sequence is flanked by compatible overhangs).
  • a homology-based repair process e.g., in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted sites in the chromosomal sequence
  • a non-homologous repair process e.g., in embodiments in which the donor sequence is flanked by compatible overhangs.
  • the method can comprise introducing into the cell or embryo one fusion protein (or nucleic acid encoding one fusion protein), one guide RNA (or DNA encoding one guide RNA), and one zinc finger nuclease (or nucleic acid encoding the zinc finger nuclease), wherein the zinc finger nuclease comprises a FokI cleavage domain or a modified FokI cleavage domain.
  • one fusion protein or nucleic acid encoding one fusion protein
  • one guide RNA or DNA encoding one guide RNA
  • zinc finger nuclease or nucleic acid encoding the zinc finger nuclease
  • the guide RNA directs the fusion protein to a specific chromosomal sequence, and the zinc finger nuclease is directed to another chromosomal sequence, wherein the fusion protein and the zinc finger nuclease dimerize such that the cleavage domain of the fusion protein and the cleavage domain of the zinc finger nuclease can introduce a double stranded break into the chromosomal sequence. See FIG. 1B .
  • the resultant double-stranded breaks can be repaired by a non-homologous repair process such that deletions of at least one nucleotide, insertions of at least one nucleotide, substitutions of at least one nucleotide, or combinations thereof can occur during the repair of the break.
  • the donor sequence in the donor polynucleotide can be exchanged with or integrated into the chromosomal sequence during repair of the double-stranded break by either a homology-based repair process (e.g., in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted sites in the chromosomal sequence) or a non-homologous repair process (e.g., in embodiments in which the donor sequence is flanked by compatible overhangs).
  • a homology-based repair process e.g., in embodiments in which the donor sequence is flanked by upstream and downstream sequences having substantial sequence identity with upstream and downstream sequences, respectively, of the targeted sites in the chromosomal sequence
  • a non-homologous repair process e.g., in embodiments in which the donor sequence is flanked by compatible overhangs.
  • the method can comprise introducing into the cell or embryo one fusion protein (or nucleic acid encoding one fusion protein) and one guide RNA (or DNA encoding one guide RNA).
  • the guide RNA directs the fusion protein to a specific chromosomal sequence, wherein the transcriptional activation domain or a transcriptional repressor domain activates or represses expression, respectively, of the targeted chromosomal sequence. See FIG. 2A .
  • the method can comprise introducing into the cell or embryo one fusion protein (or nucleic acid encoding one fusion protein) and one guide RNA (or DNA encoding one guide RNA).
  • the guide RNA directs the fusion protein to a specific chromosomal sequence, wherein the epigenetic modification domain modifies the structure of the targeted the chromosomal sequence. See FIG. 2A .
  • Epigenetic modifications include acetylation, methylation of histone proteins and/or nucleotide methylation.
  • structural modification of the chromosomal sequence leads to changes in expression of the chromosomal sequence.
  • the present disclosure encompasses genetically modified cells, non-human embryos, and non-human animals comprising at least one chromosomal sequence that has been modified using an RNA-guided endonuclease-mediated or fusion protein-mediated process, for example, using the methods described herein.
  • the disclosure provides cells comprising at least one DNA or RNA molecule encoding an RNA-guided endonuclease or fusion protein targeted to a chromosomal sequence of interest or a fusion protein, at least one guide RNA, and optionally one or more donor polynucleotide(s).
  • the disclosure also provides non-human embryos comprising at least one DNA or RNA molecule encoding an RNA-guided endonuclease or fusion protein targeted to a chromosomal sequence of interest, at least one guide RNA, and optionally one or more donor polynucleotide(s).
  • the present disclosure provides genetically modified non-human animals, non-human embryos, or animal cells comprising at least one modified chromosomal sequence.
  • the modified chromosomal sequence may be modified such that it is (1) inactivated, (2) has an altered expression or produces an altered protein product, or (3) comprises an integrated sequence.
  • the chromosomal sequence is modified with an RNA guided endonuclease-mediated or fusion protein-mediated process, using the methods described herein.
  • one aspect of the present disclosure provides a genetically modified animal in which at least one chromosomal sequence has been modified.
  • the genetically modified animal comprises at least one inactivated chromosomal sequence.
  • the modified chromosomal sequence may be inactivated such that the sequence is not transcribed and/or a functional protein product is not produced.
  • a genetically modified animal comprising an inactivated chromosomal sequence may be termed a “knock out” or a “conditional knock out.”
  • the inactivated chromosomal sequence can include a deletion mutation (i.e., deletion of one or more nucleotides), an insertion mutation (i.e., insertion of one or more nucleotides), or a nonsense mutation (i.e., substitution of a single nucleotide for another nucleotide such that a stop codon is introduced).
  • a deletion mutation i.e., deletion of one or more nucleotides
  • an insertion mutation i.e., insertion of one or more nucleotides
  • a nonsense mutation i.e., substitution of a single nucleotide for another nucleotide such that a stop codon is introduced.
  • the inactivated chromosomal sequence comprises no exogenously introduced sequence.
  • genetically modified animals in which two, three, four, five
  • the modified chromosomal sequence can be altered such that it codes for a variant protein product.
  • a genetically modified animal comprising a modified chromosomal sequence can comprise a targeted point mutation(s) or other modification such that an altered protein product is produced.
  • the chromosomal sequence can be modified such that at least one nucleotide is changed and the expressed protein comprises one changed amino acid residue (missense mutation).
  • the chromosomal sequence can be modified to comprise more than one missense mutation such that more than one amino acid is changed.
  • the chromosomal sequence can be modified to have a three nucleotide deletion or insertion such that the expressed protein comprises a single amino acid deletion or insertion.
  • the altered or variant protein can have altered properties or activities compared to the wild type protein, such as altered substrate specificity, altered enzyme activity, altered kinetic rates, etc.
  • the genetically modified animal can comprise at least one chromosomally integrated sequence.
  • a genetically modified animal comprising an integrated sequence may be termed a “knock in” or a “conditional knock in.”
  • the chromosomally integrated sequence can, for example, encode an orthologous protein, an endogenous protein, or combinations of both.
  • a sequence encoding an orthologous protein or an endogenous protein can be integrated into a chromosomal sequence encoding a protein such that the chromosomal sequence is inactivated, but the exogenous sequence is expressed.
  • the sequence encoding the orthologous protein or endogenous protein may be operably linked to a promoter control sequence.
  • a sequence encoding an orthologous protein or an endogenous protein may be integrated into a chromosomal sequence without affecting expression of a chromosomal sequence.
  • a sequence encoding a protein can be integrated into a “safe harbor” locus, such as the Rosa26 locus, HPRT locus, or AAV locus.
  • the present disclosure also encompasses genetically modified animals in which two, three, four, five, six, seven, eight, nine, or ten or more sequences, including sequences encoding protein(s), are integrated into the genome.
  • the chromosomally integrated sequence encoding a protein can encode the wild type form of a protein of interest or can encode a protein comprising at least one modification such that an altered version of the protein is produced.
  • a chromosomally integrated sequence encoding a protein related to a disease or disorder can comprise at least one modification such that the altered version of the protein produced causes or potentiates the associated disorder.
  • the chromosomally integrated sequence encoding a protein related to a disease or disorder can comprise at least one modification such that the altered version of the protein protects against the development of the associated disorder.
  • the genetically modified animal can be a “humanized” animal comprising at least one chromosomally integrated sequence encoding a functional human protein.
  • the functional human protein can have no corresponding ortholog in the genetically modified animal.
  • the wild type animal from which the genetically modified animal is derived may comprise an ortholog corresponding to the functional human protein.
  • the orthologous sequence in the “humanized” animal is inactivated such that no functional protein is made and the “humanized” animal comprises at least one chromosomally integrated sequence encoding the human protein.
  • the genetically modified animal can comprise at least one modified chromosomal sequence encoding a protein such that the expression pattern of the protein is altered.
  • regulatory regions controlling the expression of the protein such as a promoter or a transcription factor binding site, can be altered such that the protein is over-produced, or the tissue-specific or temporal expression of the protein is altered, or a combination thereof.
  • the expression pattern of the protein can be altered using a conditional knockout system.
  • a non-limiting example of a conditional knockout system includes a Cre-lox recombination system.
  • a Cre-lox recombination system comprises a Cre recombinase enzyme, a site-specific DNA recombinase that can catalyze the recombination of a nucleic acid sequence between specific sites (lox sites) in a nucleic acid molecule.
  • Methods of using this system to produce temporal and tissue specific expression are known in the art.
  • a genetically modified animal is generated with lox sites flanking a chromosomal sequence.
  • the genetically modified animal comprising the lox-flanked chromosomal sequence can then be crossed with another genetically modified animal expressing Cre recombinase.
  • Progeny animals comprising the lox-flanked chromosomal sequence and the Cre recombinase are then produced, and the lox-flanked chromosomal sequence is recombined, leading to deletion or inversion of the chromosomal sequence encoding the protein.
  • Expression of Cre recombinase can be temporally and conditionally regulated to effect temporally and conditionally regulated recombination of the chromosomal sequence.
  • the genetically modified animal disclosed herein can be heterozygous for the modified chromosomal sequence.
  • the genetically modified animal can be homozygous for the modified chromosomal sequence.
  • the genetically modified animals disclosed herein can be crossbred to create animals comprising more than one modified chromosomal sequence or to create animals that are homozygous for one or more modified chromosomal sequences.
  • two animals comprising the same modified chromosomal sequence can be crossbred to create an animal homozygous for the modified chromosomal sequence.
  • animals with different modified chromosomal sequences can be crossbred to create an animal comprising both modified chromosomal sequences.
  • a first animal comprising an inactivated chromosomal sequence gene “x” can be crossed with a second animal comprising a chromosomally integrated sequence encoding a human gene “X” protein to give rise to “humanized” gene “X” offspring comprising both the inactivated gene “x” chromosomal sequence and the chromosomally integrated human gene “X” sequence.
  • a humanized gene “X” animal can be crossed with a humanized gene “Y” animal to create humanized gene X/gene Y offspring.
  • an animal comprising a modified chromosomal sequence can be crossbred to combine the modified chromosomal sequence with other genetic backgrounds.
  • other genetic backgrounds may include wild-type genetic backgrounds, genetic backgrounds with deletion mutations, genetic backgrounds with another targeted integration, and genetic backgrounds with non-targeted integrations.
  • animal refers to a non-human animal.
  • the animal may be an embryo, a juvenile, or an adult.
  • Suitable animals include vertebrates such as mammals, birds, reptiles, amphibians, shellfish, and fish. Examples of suitable mammals include without limit rodents, companion animals, livestock, and primates.
  • rodents include mice, rats, hamsters, gerbils, and guinea pigs.
  • Suitable companion animals include but are not limited to cats, dogs, rabbits, hedgehogs, and ferrets.
  • livestock include horses, goats, sheep, swine, cattle, llamas, and alpacas.
  • Suitable primates include but are not limited to capuchin monkeys, chimpanzees, lemurs, macaques, marmosets, tamarins, spider monkeys, squirrel monkeys, and vervet monkeys.
  • Non-limiting examples of birds include chickens, turkeys, ducks, and geese.
  • the animal may be an invertebrate such as an insect, a nematode, and the like.
  • Non-limiting examples of insects include Drosophila and mosquitoes.
  • An exemplary animal is a rat.
  • suitable rat strains include Dahl Salt-Sensitive, Fischer 344, Lewis, Long Evans Hooded, Sprague-Dawley, and Wistar.
  • the animal is not a genetically modified mouse. In each of the foregoing iterations of suitable animals for the invention, the animal does not include exogenously introduced, randomly integrated transposon sequences.
  • a further aspect of the present disclosure provides genetically modified cells or cell lines comprising at least one modified chromosomal sequence.
  • the genetically modified cell or cell line can be derived from any of the genetically modified animals disclosed herein.
  • the chromosomal sequence can be modified in a cell as described herein above (in the paragraphs describing chromosomal sequence modifications in animals) using the methods descried herein.
  • the disclosure also encompasses a lysate of said cells or cell lines.
  • the cells are eukaryotic cells.
  • Suitable host cells include fungi or yeast, such as Pichia, Saccharomyces , or Schizosaccharomyces ; insect cells, such as SF9 cells from Spodoptera frugiperda or S2 cells from Drosophila melanogaster ; and animal cells, such as mouse, rat, hamster, non-human primate, or human cells.
  • Exemplary cells are mammalian.
  • the mammalian cells can be primary cells. In general, any primary cell that is sensitive to double strand breaks may be used.
  • the cells may be of a variety of cell types, e.g., fibroblast, myoblast, T or B cell, macrophage, epithelial cell, and so forth.
  • the cell line can be any established cell line or a primary cell line that is not yet described.
  • the cell line can be adherent or non-adherent, or the cell line can be grown under conditions that encourage adherent, non-adherent or organotypic growth using standard techniques known to individuals skilled in the art.
  • suitable mammalian cells and cell lines are provided herein in section (IV)(g).
  • the cell can be a stem cell.
  • suitable stem cells are provided in section (IV)(g).
  • the present disclosure also provides a genetically modified non-human embryo comprising at least one modified chromosomal sequence.
  • the chromosomal sequence can be modified in an embryo as described herein above (in the paragraphs describing chromosomal sequence modifications in animals) using the methods descried herein.
  • the embryo is a non-human fertilized one-cell stage embryo of the animal species of interest.
  • Exemplary mammalian embryos, including one cell embryos include without limit, mouse, rat, hamster, rodent, rabbit, feline, canine, ovine, porcine, bovine, equine, and primate embryos.
  • endogenous sequence refers to a chromosomal sequence that is native to the cell.
  • exogenous refers to a sequence that is not native to the cell, or a chromosomal sequence whose native location in the genome of the cell is in a different chromosomal location.
  • a “gene,” as used herein, refers to a DNA region (including exons and introns) encoding a gene product, as well as all DNA regions which regulate the production of the gene product, whether or not such regulatory sequences are adjacent to coding and/or transcribed sequences. Accordingly, a gene includes, but is not necessarily limited to, promoter sequences, terminators, translational regulatory sequences such as ribosome binding sites and internal ribosome entry sites, enhancers, silencers, insulators, boundary elements, replication origins, matrix attachment sites, and locus control regions.
  • heterologous refers to an entity that is not endogenous or native to the cell of interest.
  • a heterologous protein refers to a protein that is derived from or was originally derived from an exogenous source, such as an exogenously introduced nucleic acid sequence. In some instances, the heterologous protein is not normally produced by the cell of interest.
  • nucleic acid and “polynucleotide” refer to a deoxyribonucleotide or ribonucleotide polymer, in linear or circular conformation, and in either single- or double-stranded form. For the purposes of the present disclosure, these terms are not to be construed as limiting with respect to the length of a polymer.
  • the terms can encompass known analogs of natural nucleotides, as well as nucleotides that are modified in the base, sugar and/or phosphate moieties (e.g., phosphorothioate backbones). In general, an analog of a particular nucleotide has the same base-pairing specificity; i.e., an analog of A will base-pair with T.
  • nucleotide refers to deoxyribonucleotides or ribonucleotides.
  • the nucleotides may be standard nucleotides (i.e., adenosine, guanosine, cytidine, thymidine, and uridine) or nucleotide analogs.
  • a nucleotide analog refers to a nucleotide having a modified purine or pyrimidine base or a modified ribose moiety.
  • a nucleotide analog may be a naturally occurring nucleotide (e.g., inosine) or a non-naturally occurring nucleotide.
  • Non-limiting examples of modifications on the sugar or base moieties of a nucleotide include the addition (or removal) of acetyl groups, amino groups, carboxyl groups, carboxymethyl groups, hydroxyl groups, methyl groups, phosphoryl groups, and thiol groups, as well as the substitution of the carbon and nitrogen atoms of the bases with other atoms (e.g., 7-deaza purines).
  • Nucleotide analogs also include dideoxy nucleotides, 2′-O-methyl nucleotides, locked nucleic acids (LNA), peptide nucleic acids (PNA), and morpholinos.
  • polypeptide and “protein” are used interchangeably to refer to a polymer of amino acid residues.
  • nucleic acid and amino acid sequence identity are known in the art. Typically, such techniques include determining the nucleotide sequence of the mRNA for a gene and/or determining the amino acid sequence encoded thereby, and comparing these sequences to a second nucleotide or amino acid sequence. Genomic sequences can also be determined and compared in this fashion. In general, identity refers to an exact nucleotide-to-nucleotide or amino acid-to-amino acid correspondence of two polynucleotides or polypeptide sequences, respectively. Two or more sequences (polynucleotide or amino acid) can be compared by determining their percent identity.
  • the percent identity of two sequences is the number of exact matches between two aligned sequences divided by the length of the shorter sequences and multiplied by 100.
  • An approximate alignment for nucleic acid sequences is provided by the local homology algorithm of Smith and Waterman, Advances in Applied Mathematics 2:482-489 (1981). This algorithm can be applied to amino acid sequences by using the scoring matrix developed by Dayhoff, Atlas of Protein Sequences and Structure, M. O. Dayhoff ed., 5 suppl. 3:353-358, National Biomedical Research Foundation, Washington, D.C., USA, and normalized by Gribskov, Nucl. Acids Res. 14(6):6745-6763 (1986).
  • a Cas9 gene from Streptococcus pyogenes strain MGAS15252 was optimized with Homo sapiens codon preference to enhance its translation in mammalian cells.
  • the Cas9 gene also was modified by adding a nuclear localization signal PKKKRKV (SEQ ID NO:1) at the C terminus for targeting the protein into the nuclei of mammalian cells.
  • Table 1 presents the modified Cas9 amino acid sequence, with the nuclear localization sequence underlined.
  • Table 2 presents the codon optimized, modified Cas9 DNA sequence.
  • the modified Cas9 DNA sequence was placed under the control of cytomegalovirus (CMV) promoter for constituent expression in mammalian cells.
  • CMV cytomegalovirus
  • the modified Cas9 DNA sequence was also placed under the control T7 promoter for in vitro mRNA synthesis with T7 RNA polymerase.
  • In vitro RNA transcription was performed by using MessageMAX T7 ARCA-Capped Message Transcription Kit and T7 mScript Standard mRNA Production System (Cellscript).
  • the adeno-associated virus integration site 1 (AAVS1) locus was used as a target for Cas9-mediated human genome modification.
  • the human AAVS1 locus is located in intron 1 (4427 bp) of protein phosphatase 1, regulatory subunit 12C (PPP1R12C).
  • PPP1R12C protein phosphatase 1, regulatory subunit 12C
  • Table 3 presents the first exon (shaded gray) and the first intron of PPP1R12C.
  • the underlined sequence within the intron is the targeted modification site (i.e., AAVS1 locus).
  • Cas9 guide RNAs were designed for targeting the human AAVS1 locus.
  • a 42 nucleotide RNA (referred to herein as a “crRNA” sequence) comprising (5′ to 3′) a target recognition sequence (i.e., sequence complementary to the non-coding strand of the target sequence) and protospacer sequence; a 85 nucleotide RNA (referred to herein as a “tracrRNA” sequence) comprising 5′ sequence with complementarity to the 3′ sequence of the crRNA and additional hairpin sequence; and a chimeric RNA comprising nucleotides 1-32 of the crRNA, a GAAA loop, and nucleotides 19-45 of the tracrRNA were prepared.
  • the crRNA was chemically synthesized by Sigma-Aldrich.
  • the tracrRNA and chimeric RNA were synthesized by in vitro transcription with T7 RNA polymerase using T7-Scribe Standard RNA IVT Kit (Cellscript).
  • the chimeric RNA coding sequence was also placed under the control of human U6 promoter for in vivo transcription in human cells.
  • Table 4 presents the sequences of the guide RNAs.
  • RNA 5′-3′ Sequence NO: AAVS1- ACCCCACAGUGGGGCCACUAGUUUUAGAG 12 crRNA CUAUGCUGUUUUG tracrRNA GGAACCAUUCAAAACAGCAUAGCAAGUUA 13 AAAUAAGGCUAGUCCGUUAUCAACUUGAA AAAGUGGCACCGAGUCGGUGCUUUUUU chimeric ACCCCACAGUGGGGCCACUAGUUUUAGAG 14 RNA CUAGAAAUAGCAAGUUAAAAUAAGGCUAG UCCG
  • AAVS1-GFP DNA donor contained a 5′ (1185 bp) AAVS1 locus homologous arm, an RNA splicing receptor, a turbo GFP coding sequence, a 3′ transcription terminator, and a 3′ (1217 bp) AAVS1 locus homologous arm.
  • Table 5 presents the sequences of the RNA splicing receptor and the GFP coding sequence followed by the 3′ transcription terminator.
  • Plasmid DNA was prepared by using GenElute Endotoxin-Free Plasmid Maxiprep Kit (Sigma).
  • Targeted gene integration will result in a fusion protein between the first 107 amino acids of the PPP1R12C and the turbo GFP.
  • the expected fusion protein contains the first 107 amino acid residues of PPP1R12C (highlighted in grey) from RNA splicing between the first exon of PPP1R12C and the engineered splice receptor (see Table 6).
  • the K562 cell line was obtained from American Type Culture Collection (ATCC) and grown in Iscove's Modified Dulbecco's Medium, supplemented with 10% FBS and 2 mM L-glutamine. All media and supplements were obtained from Sigma-Aldrich. Cultures were split one day before transfection (at approximately 0.5 million cells per mL before transfection). Cells were transfected with Nucleofector Solution V (Lonza) on a Nucleofector (Lonza) with the T-016 program. Each nucleofection contained approximately 0.6 million cells. Transfection treatments are detailed in Table 7. Cells were grown at 37° C. and 5% CO 2 immediately after nucleofection.
  • Fluorescence-activated cell sorting was performed 4 days after transfection. FACS data are presented in FIG. 4 .
  • the percent GFP detected in each of the four experimental treatments was greater than in the control treatments (E, F), confirming integration of the donor sequence and expression of the fusion protein.
  • Genomic DNA was extracted from transfected cells with GenElute Mammalian Genomic DNA Miniprep Kit (Sigma) 12 days after transfection. Genomic DNA was then PCR amplified with a forward primer located outside the 5′ homologous arm of the AAVS1-GFP plasmid donor and a reverse primer located at the 5′ region of the GFP.
  • the forward primer was 5′-CCACTCTGTGCTGACCACTCT-3′ (SEQ ID NO:18) and reverse primer was 5′-GCGGCACTCGATCTCCA-3′ (SEQ ID NO:19).
  • the expected fragment size from the junction PCR was 1388 bp.
  • the amplification was carried out with JumpStart Taq ReadyMix (Sigma), using the following cycling conditions: 98° C.
  • PCR products were resolved on 1% agarose gel.
  • the mouse Rosa26 locus can be targeted for genome modifications.
  • Table 8 presents a portion of the mouse Rosa26 sequence in which potential target sites are shown in bold. Each target site comprises a protospacer.
  • RNAs were designed to target each of the target sites in the mouse Rosa26 locus.
  • the sequences are shown in Table 9, each is 42 nucleotides in length and the 5′ region is complementary to the strand that is not presented in Table 8 (i.e., the strand that is complementary to the strand shown in Table 8).
  • the crRNAs were chemically synthesized and pre-annealed to the tracrRNA (SEQ ID NO:13; see Example 2).
  • Pre-annealed crRNA/tracrRNA and in vitro transcribed mRNA encoding modified Cas9 protein (SEQ ID NO. 9; see Example 1) can be microinjected into the pronuclei of fertilized mouse embryos.
  • the Cas9 protein cleaves the target site, and the resultant double-stranded break can be repaired via a non-homologous end-joining (NHEJ) repair process.
  • NHEJ non-homologous end-joining
  • the injected embryos can be either incubated at 37° C., 5% CO 2 overnight or for up to 4 days, followed by genotyping analysis, or the injected embryos can be implanted into recipient female mice such that live born animals can be genotyped.
  • the in vitro-incubated embryos or tissues from live born animals can be screened for the presence of Cas9-induced mutation at the Rosa locus using standard methods.
  • the embryos or tissues from fetus or live-born animals can be harvested for DNA extraction and analysis. DNA can be isolated using standard procedures.
  • the targeted region of the Rosa26 locus can be PCR amplified using appropriate primers.
  • NHEJ is error-prone, deletions of at least one nucleotide, insertions of at least one nucleotide, substitutions of at least one nucleotide, or combinations thereof can occur during the repair of the break. Mutations can be detected using PCR-based genotyping methods, such as Cel-I mismatch assays and DNA sequencing.
  • the Rosa26 locus can be modified in mouse embryos by co-injecting a donor polynucleotide, as detailed above in section (IV)(d), along with the pre-annealed crRNA/tracrRNA and mRNA encoding modified Cas9 as described above in Example 6.
  • a donor polynucleotide as detailed above in section (IV)(d)
  • mRNA encoding modified Cas9 as described above in Example 6.
  • In vitro-incubated embryos or tissues from live born animals (as described in Example 6) can be screened for a modified Rosa26 locus using PCR-based genotyping methods, such as RFLP assays, junction PCR, and DNA sequencing.
  • the rat Rosa26 locus can be targeted for genome modifications.
  • Table 10 presents a portion of the rat sequence in which potential target sites are shown in bold. Each target site comprises a protospacer.
  • RNAs were designed to target each of the target sites in the rat Rosa26 locus.
  • the sequences are shown in Table 11, each is 42 nucleotides in length and the 5′ region is complementary to the strand that is not presented in Table 10 (i.e., the strand that is complementary to the strand shown in Table 10).
  • the crRNAs were chemically synthesized and pre-annealed to the tracrRNA (SEQ ID NO:13; see Example 2).
  • Pre-annealed crRNA/tracrRNA and in vitro transcribed mRNA encoding modified Cas9 protein (SEQ ID NO. 9; see Example 1) can be microinjected into the pronuclei of fertilized rat embryos.
  • the Cas9 protein cleaves the target site, and the resultant double-stranded break can be repaired via a non-homologous end-joining (NHEJ) repair process.
  • NHEJ non-homologous end-joining
  • the injected embryos can be either incubated at 37° C., 5% CO 2 overnight or for up to 4 days, followed by genotyping analysis, or the injected embryos can be implanted into recipient female mice such that live born animals can be genotyped.
  • the in vitro-incubated embryos or tissues from live born animals can be screened for the presence of Cas9-induced mutation at the Rosa locus using standard methods.
  • the embryos or tissues from fetus or live-born animals can be harvested for DNA extraction and analysis. DNA can be isolated using standard procedures.
  • the targeted region of the Rosa26 locus can be PCR amplified using appropriate primers.
  • NHEJ is error-prone, deletions of at least one nucleotide, insertions of at least one nucleotide, substitutions of at least one nucleotide, or combinations thereof can occur during the repair of the break. Mutations can be detected using PCR-based genotyping methods, such as Cel-I mismatch assays and DNA sequencing.
  • the Rosa26 locus can be modified in rat embryos by co-injecting a donor polynucleotide, as detailed above in section (IV)(d), along with the pre-annealed crRNA/tracrRNA and mRNA encoding modified Cas9 as described above in Example 8.
  • a donor polynucleotide as detailed above in section (IV)(d)
  • mRNA encoding modified Cas9 as described above in Example 8.
  • In vitro-incubated embryos or tissues from live born rats (as described in Example 8) can be screened for a modified Rosa26 locus using PCR-based genotyping methods, such as RFLP assays, junction PCR, and DNA sequencing.

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US15/188,924 Continuation US10745716B2 (en) 2012-12-06 2016-06-21 CRISPR-based genome modification and regulation
US15/188,927 Continuation US20160298136A1 (en) 2012-12-06 2016-06-21 Crispr-based genome modification and regulation
US15/188,911 Continuation US10731181B2 (en) 2012-12-06 2016-06-21 CRISPR-based genome modification and regulation
US15/188,931 Continuation US20160298137A1 (en) 2012-12-06 2016-06-21 Crispr-based genome modification and regulation
US15/188,933 Continuation US20160298138A1 (en) 2012-12-06 2016-06-21 Crispr-based genome modification and regulation
US15/188,899 Division US20160298125A1 (en) 2012-12-06 2016-06-21 Crispr-based genome modification and regulation
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