US20140189896A1 - Crispr-cas component systems, methods and compositions for sequence manipulation - Google Patents

Crispr-cas component systems, methods and compositions for sequence manipulation Download PDF

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Publication number
US20140189896A1
US20140189896A1 US14/105,035 US201314105035A US2014189896A1 US 20140189896 A1 US20140189896 A1 US 20140189896A1 US 201314105035 A US201314105035 A US 201314105035A US 2014189896 A1 US2014189896 A1 US 2014189896A1
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United States
Prior art keywords
sequence
crispr
enzyme
tracr
target
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Abandoned
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US14/105,035
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English (en)
Inventor
Feng Zhang
Le Cong
David Benjamin Turitz COX
Patrick Hsu
Shuailiang LIN
Fei RAN
Randall Jeffrey Platt
Neville Espi Sanjana
Luciano MARRAFFINI
David Olivier BIKARD
Wenyan Jiang
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Rockefeller University
Massachusetts Institute of Technology
Broad Institute Inc
Harvard University
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Priority to US14/105,035 priority Critical patent/US20140189896A1/en
Application filed by Individual filed Critical Individual
Assigned to THE ROCKEFELLER UNIVERSITY reassignment THE ROCKEFELLER UNIVERSITY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BIKARD, DAVID OLIVIER, JIANG, WENYAN, MARRAFFINI, Luciano
Assigned to THE BROAD INSTITUTE, INC. reassignment THE BROAD INSTITUTE, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIN, SHUAILIANG
Assigned to THE BROAD INSTITUTE, INC., MASSACHUSETTS INSTITUTE OF TECHNOLOGY reassignment THE BROAD INSTITUTE, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZHANG, FENG
Assigned to MASSACHUSETTS INSTITUTE OF TECHNOLOGY reassignment MASSACHUSETTS INSTITUTE OF TECHNOLOGY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COX, DAVID BENJAMIN TURITZ, PLATT, RANDALL JEFFREY, SANJANA, NEVILLE ESPI
Priority to US14/183,486 priority patent/US8795965B2/en
Priority to US14/259,420 priority patent/US8871445B2/en
Assigned to PRESIDENT AND FELLOWS OF HARVARD COLLEGE reassignment PRESIDENT AND FELLOWS OF HARVARD COLLEGE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CONG, LE
Assigned to PRESIDENT AND FELLOWS OF HARVARD COLLEGE reassignment PRESIDENT AND FELLOWS OF HARVARD COLLEGE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CONG, LE
Publication of US20140189896A1 publication Critical patent/US20140189896A1/en
Assigned to PRESIDENT AND FELLOWS OF HARVARD COLLEGE reassignment PRESIDENT AND FELLOWS OF HARVARD COLLEGE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HSU, PATRICK
Assigned to PRESIDENT AND FELLOWS OF HARVARD COLLEGE reassignment PRESIDENT AND FELLOWS OF HARVARD COLLEGE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAN, Fei
Assigned to NATIONAL INSTITUTES OF HEALTH (NIH), U.S. DEPT. OF HEALTH AND HUMAN SERVICES (DHHS), U.S. GOVERNMENT reassignment NATIONAL INSTITUTES OF HEALTH (NIH), U.S. DEPT. OF HEALTH AND HUMAN SERVICES (DHHS), U.S. GOVERNMENT CONFIRMATORY LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: BROAD INSTITUTE, INC.
Assigned to The Broad Institute Inc. reassignment The Broad Institute Inc. CORRECTIVE ASSIGNMENT TO CORRECT THE EXECUTED ASSIGNMENT DOCUMENT PREVIOUSLY RECORDED ON REEL 031916 FRAME 0954. ASSIGNOR(S) HEREBY CONFIRMS THE EXECUTED ASSIGNMENT DOCUMENT. Assignors: LIN, SHUAILIANG
Assigned to MASSACHUSETTS INSTITUTE OF TECHNOLOGY reassignment MASSACHUSETTS INSTITUTE OF TECHNOLOGY CORRECTIVE ASSIGNMENT TO CORRECT THE EXECUTED ASSIGNMENT DOCUMENT PREVIOUSLY RECORDED AT REEL: 031916 FRAME: 0568. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: COX, DAVID BENJAMIN, PLATT, RANDALL JEFFREY, SANJANA, NEVILLE ESPI
Priority to US15/230,161 priority patent/US20180327756A1/en
Priority to US15/967,510 priority patent/US20190040399A1/en
Priority to US15/967,495 priority patent/US20190017058A1/en
Priority to US16/445,156 priority patent/US20200032278A1/en
Priority to US16/445,150 priority patent/US20200032277A1/en
Priority to US16/532,442 priority patent/US20200063147A1/en
Priority to US16/535,043 priority patent/US20200080094A1/en
Priority to US17/034,754 priority patent/US20210079407A1/en
Priority to US18/109,550 priority patent/US20240182913A1/en
Priority to US18/128,122 priority patent/US20230340505A1/en
Priority to US18/134,317 priority patent/US20230374527A1/en
Priority to US18/454,343 priority patent/US20240117365A1/en
Priority to US19/028,841 priority patent/US20250250578A1/en
Abandoned legal-status Critical Current

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Definitions

  • the present invention generally relates to systems, methods and compositions used for the control of gene expression involving sequence targeting, such as genome perturbation or gene-editing, that may use vector systems related to Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) and components thereof.
  • sequence targeting such as genome perturbation or gene-editing
  • CRISPR Clustered Regularly Interspaced Short Palindromic Repeats
  • the CRISPR/Cas or the CRISPR-Cas system does not require the generation of customized proteins to target specific sequences but rather a single Cas enzyme can be programmed by a short RNA molecule to recognize a specific DNA target, in other words the Cas enzyme can be recruited to a specific DNA target using said short RNA molecule.
  • Adding the CRISPR-Cas system to the repertoire of genome sequencing techniques and analysis methods may significantly simplify the methodology and accelerate the ability to catalog and map genetic factors associated with a diverse range of biological functions and diseases.
  • the invention provides a vector system comprising one or more vectors.
  • the system comprises: (a) a first regulatory element operably linked to a tracr mate sequence and one or more insertion sites for inserting one or more guide sequences upstream of the tracr mate sequence, wherein when expressed, the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell, wherein the CRISPR complex comprises a CRISPR enzyme complexed with (1) the guide sequence that is hybridized to the target sequence, and (2) the tracr mate sequence that is hybridized to the tracr sequence; and (b) a second regulatory element operably linked to an enzyme-coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence; wherein components (a) and (b) are located on the same or different vectors of the system.
  • component (a) further comprises the tracr sequence downstream of the tracr mate sequence under the control of the first regulatory element.
  • component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein when expressed, each of the two or more guide sequences direct sequence specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell.
  • the system comprises the tracr sequence under the control of a third regulatory element, such as a polymerase III promoter.
  • the tracr sequence exhibits at least 50%, 60%, 70%, 80%, 90%, 95%, or 99% of sequence complementarity along the length of the tracr mate sequence when optimally aligned.
  • the CRISPR complex comprises one or more nuclear localization sequences of sufficient strength to drive accumulation of said CRISPR complex in a detectable amount in the nucleus of a eukaryotic cell.
  • a nuclear localization sequence is not necessary for CRISPR complex activity in eukaryotes, but that including such sequences enhances activity of the system, especially as to targeting nucleic acid molecules in the nucleus.
  • the CRISPR enzyme is a type II CRISPR system enzyme. In some embodiments, the CRISPR enzyme is a Cas9 enzyme. In some embodiments, the Cas9 enzyme is S. pneumoniae, S. pyogenes , or S. thermophilus Cas9, and may include mutated Cas9 derived from these organisms. The enzyme may be a Cas9 homolog or ortholog. In some embodiments, the CRISPR enzyme is codon-optimized for expression in a eukaryotic cell. In some embodiments, the CRISPR enzyme directs cleavage of one or two strands at the location of the target sequence. In some embodiments, the CRISPR enzyme lacks DNA strand cleavage activity.
  • the first regulatory element is a polymerase III promoter.
  • the second regulatory element is a polymerase II promoter.
  • the guide sequence is at least 15, 16, 17, 18, 19, 20, 25 nucleotides, or between 10-30, or between 15-25, or between 15-20 nucleotides in length.
  • the term “vector” refers to a nucleic acid molecule capable of transporting another nucleic acid to which it has been linked. Vectors include, but are not limited to, nucleic acid molecules that are single-stranded, double-stranded, or partially double-stranded; nucleic acid molecules that comprise one or more free ends, no free ends (e.g.
  • vectors refers to a circular double stranded DNA loop into which additional DNA segments can be inserted, such as by standard molecular cloning techniques.
  • viral vector wherein virally-derived DNA or RNA sequences are present in the vector for packaging into a virus (e.g. retroviruses, replication defective retroviruses, adenoviruses, replication defective adenoviruses, and adeno-associated viruses).
  • Viral vectors also include polynucleotides carried by a virus for transfection into a host cell.
  • vectors are capable of autonomous replication in a host cell into which they are introduced (e.g. bacterial vectors having a bacterial origin of replication and episomal mammalian vectors). Other vectors (e.g., non-episomal mammalian vectors) are integrated into the genome of a host cell upon introduction into the host cell, and thereby are replicated along with the host genome. Moreover, certain vectors are capable of directing the expression of genes to which they are operatively-linked. Such vectors are referred to herein as “expression vectors.” Common expression vectors of utility in recombinant DNA techniques are often in the form of plasmids.
  • Recombinant expression vectors can comprise a nucleic acid of the invention in a form suitable for expression of the nucleic acid in a host cell, which means that the recombinant expression vectors include one or more regulatory elements, which may be selected on the basis of the host cells to be used for expression, that is operatively-linked to the nucleic acid sequence to be expressed.
  • “operably linked” is intended to mean that the nucleotide sequence of interest is linked to the regulatory element(s) in a manner that allows for expression of the nucleotide sequence (e.g. in an in vitro transcription/translation system or in a host cell when the vector is introduced into the host cell).
  • regulatory element is intended to include promoters, enhancers, internal ribosomal entry sites (IRES), and other expression control elements (e.g. transcription termination signals, such as polyadenylation signals and poly-U sequences).
  • promoters e.g. promoters, enhancers, internal ribosomal entry sites (IRES), and other expression control elements (e.g. transcription termination signals, such as polyadenylation signals and poly-U sequences).
  • IRES internal ribosomal entry sites
  • regulatory elements e.g. transcription termination signals, such as polyadenylation signals and poly-U sequences.
  • Regulatory elements include those that direct constitutive expression of a nucleotide sequence in many types of host cell and those that direct expression of the nucleotide sequence only in certain host cells (e.g., tissue-specific regulatory sequences).
  • a tissue-specific promoter may direct expression primarily in a desired tissue of interest, such as muscle, neuron, bone, skin, blood, specific organs (e.g. liver, pancreas), or particular cell types (e.g. lymphocytes). Regulatory elements may also direct expression in a temporal-dependent manner, such as in a cell-cycle dependent or developmental stage-dependent manner, which may or may not also be tissue or cell-type specific.
  • a vector comprises one or more pol III promoter (e.g. 1, 2, 3, 4, 5, or more pol III promoters), one or more pol II promoters (e.g. 1, 2, 3, 4, 5, or more pol II promoters), one or more pol I promoters (e.g.
  • pol III promoters include, but are not limited to, U6 and H1 promoters.
  • pol II promoters include, but are not limited to, the retroviral Rous sarcoma virus (RSV) LTR promoter (optionally with the RSV enhancer), the cytomegalovirus (CMV) promoter (optionally with the CMV enhancer) [see, e.g., Boshart et al, Cell, 41:521-530 (1985)], the SV40 promoter, the dihydrofolate reductase promoter, the ⁇ -actin promoter, the phosphoglycerol kinase (PGK) promoter, and the EF1 ⁇ promoter.
  • RSV Rous sarcoma virus
  • CMV cytomegalovirus
  • PGK phosphoglycerol kinase
  • enhancer elements such as WPRE; CMV enhancers; the R-U5′ segment in LTR of HTLV-I (Mol. Cell. Biol., Vol. 8(1), p. 466-472, 1988); SV40 enhancer; and the intron sequence between exons 2 and 3 of rabbit ⁇ -globin (Proc. Natl. Acad. Sci. USA., Vol. 78(3), p. 1527-31, 1981).
  • WPRE WPRE
  • CMV enhancers the R-U5′ segment in LTR of HTLV-I
  • SV40 enhancer SV40 enhancer
  • the intron sequence between exons 2 and 3 of rabbit ⁇ -globin Proc. Natl. Acad. Sci. USA., Vol. 78(3), p. 1527-31, 1981.
  • a vector can be introduced into host cells to thereby produce transcripts, proteins, or peptides, including fusion proteins or peptides, encoded by nucleic acids as described herein (e.g., clustered regularly interspersed short palindromic repeats (CRISPR) transcripts, proteins, enzymes, mutant forms thereof, fusion proteins thereof, etc.).
  • CRISPR clustered regularly interspersed short palindromic repeats
  • Advantageous vectors include lentiviruses and adeno-associated viruses, and types of such vectors can also be selected for targeting particular types of cells.
  • the invention provides a vector comprising a regulatory element operably linked to an enzyme-coding sequence encoding a CRISPR enzyme comprising one or more nuclear localization sequences.
  • said regulatory element drives transcription of the CRISPR enzyme in a eukaryotic cell such that said CRISPR enzyme accumulates in a detectable amount in the nucleus of the eukaryotic cell.
  • the regulatory element is a polymerase II promoter.
  • the CRISPR enzyme is a type II CRISPR system enzyme.
  • the CRISPR enzyme is a Cas9 enzyme.
  • the Cas9 enzyme is S. pneumoniae, S. pyogenes or S.
  • thermophilus Cas9 and may include mutated Cas9 derived from these organisms.
  • the CRISPR enzyme is codon-optimized for expression in a eukaryotic cell.
  • the CRISPR enzyme directs cleavage of one or two strands at the location of the target sequence.
  • the CRISPR enzyme lacks DNA strand cleavage activity.
  • the invention provides a CRISPR enzyme comprising one or more nuclear localization sequences of sufficient strength to drive accumulation of said CRISPR enzyme in a detectable amount in the nucleus of a eukaryotic cell.
  • the CRISPR enzyme is a type II CRISPR system enzyme.
  • the CRISPR enzyme is a Cas9 enzyme.
  • the Cas9 enzyme is S. pneumoniae, S. pyogenes or S. thermophilus Cas9, and may include mutated Cas9 derived from these organisms.
  • the enzyme may be a Cas9 homolog or ortholog.
  • the CRISPR enzyme lacks the ability to cleave one or more strands of a target sequence to which it binds.
  • the invention provides a eukaryotic host cell comprising (a) a first regulatory element operably linked to a tracr mate sequence and one or more insertion sites for inserting one or, more guide sequences upstream of the tracr mate sequence, wherein when expressed, the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell, wherein the CRISPR complex comprises a CRISPR enzyme complexed with (1) the guide sequence that is hybridized to the target sequence, and (2) the tracr mate sequence that is hybridized to the tracr sequence; and/or (b) a second regulatory element operably linked to an enzyme-coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence.
  • the host cell comprises components (a) and (b).
  • component (a), component (b), or components (a) and (b) are stably integrated into a genome of the host eukaryotic cell.
  • component (a) further comprises the tracr sequence downstream of the tracr mate sequence under the control of the first regulatory element.
  • component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein when expressed, each of the two or more guide sequences direct sequence specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell.
  • the eukaryotic host cell further comprises a third regulatory element, such as a polymerase III promoter, operably linked to said tracr sequence.
  • the tracr sequence exhibits at least 50%, 60%, 70%, 80%, 90%, 95%, or 99% of sequence complementarity along the length of the tracr mate sequence when optimally aligned.
  • the CRISPR enzyme comprises one or more nuclear localization sequences of sufficient strength to drive accumulation of said CRISPR enzyme in a detectable amount in the nucleus of a eukaryotic cell.
  • the CRISPR enzyme is a type II CRISPR system enzyme.
  • the CRISPR enzyme is a Cas9 enzyme.
  • the Cas9 enzyme is S. pneumoniae, S. pyogenes or S. thermophilus Cas9, and may include mutated Cas9 derived from these organisms.
  • the enzyme may be a Cas9 homolog or ortholog.
  • the CRISPR enzyme is codon-optimized for expression in a eukaryotic cell.
  • the CRISPR enzyme directs cleavage of one or two strands at the location of the target sequence.
  • the CRISPR enzyme lacks DNA strand cleavage activity.
  • the first regulatory element is a polymerase III promoter.
  • the second regulatory element is a polymerase II promoter.
  • the guide sequence is at least 15, 16, 17, 18, 19, 20, 25 nucleotides, or between 10-30, or between 15-25, or between 15-20 nucleotides in length.
  • the invention provides a non-human eukaryotic organism; preferably a multicellular eukaryotic organism, comprising a eukaryotic host cell according to any of the described embodiments.
  • the invention provides a eukaryotic organism; preferably a multicellular eukaryotic organism, comprising a eukaryotic host cell according to any of the described embodiments.
  • the organism in some embodiments of these aspects may be an animal; for example a mammal. Also, the organism may be an arthropod such as an insect. The organism also may be a plant. Further, the organism may be a fungus.
  • the invention provides a kit comprising one or more of the components described herein.
  • the kit comprises a vector system and instructions for using the kit.
  • the vector system comprises (a) a first regulatory element operably linked to a tracr mate sequence and one or more insertion sites for inserting one or more guide sequences upstream of the tracr mate sequence, wherein when expressed, the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell, wherein the CRISPR complex comprises a CRISPR enzyme complexed with (1) the guide sequence that is hybridized to the target sequence, and (2) the tracr mate sequence that is hybridized to the tracr sequence; and/or (b) a second regulatory element operably linked to an enzyme-coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence.
  • the kit comprises components (a) and (b) located on the same or different vectors of the system.
  • component (a) further comprises the tracr sequence downstream of the tracr mate sequence under the control of the first regulatory element.
  • component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein when expressed, each of the two or more guide sequences direct sequence specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell.
  • the system further comprises a third regulatory element, such as a polymerase III promoter, operably linked to said tracr sequence.
  • the tracr sequence exhibits at least 50%, 60%, 70%, 80%, 90%, 95%, or 99% of sequence complementarity along the length of the tracr mate sequence when optimally aligned.
  • the CRISPR enzyme comprises one or more nuclear localization sequences of sufficient strength to drive accumulation of said CRISPR enzyme in a detectable amount in the nucleus of a eukaryotic cell.
  • the CRISPR enzyme is a type II CRISPR system enzyme.
  • the CRISPR enzyme is a Cas9 enzyme.
  • the Cas9 enzyme is S. pneumoniae, S. pyogenes or S.
  • thermophilus Cas9 and may include mutated Cas9 derived from these organisms.
  • the enzyme may be a Cas9 homolog or ortholog.
  • the CRISPR enzyme is codon-optimized for expression in a eukaryotic cell.
  • the CRISPR enzyme directs cleavage of one or two strands at the location of the target sequence.
  • the CRISPR enzyme lacks DNA strand cleavage activity.
  • the first regulatory element is a polymerase III promoter.
  • the second regulatory element is a polymerase II promoter.
  • the guide sequence is at least 15, 16, 17, 18, 19, 20, 25 nucleotides, or between 10-30, or between 15-25, or between 15-20 nucleotides in length.
  • the invention provides a method of modifying a target polynucleotide in a eukaryotic cell.
  • the method comprises allowing a CRISPR complex to bind to the target polynucleotide to effect cleavage of said target polynucleotide thereby modifying the target polynucleotide, wherein the CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence hybridized to a target sequence within said target polynucleotide, wherein said guide sequence is linked to a tracr mate sequence which in turn hybridizes to a tracr sequence.
  • said cleavage comprises cleaving one or two strands at the location of the target sequence by said CRISPR enzyme. In some embodiments, said cleavage results in decreased transcription of a target gene. In some embodiments, the method further comprises repairing said cleaved target polynucleotide by homologous recombination with an exogenous template polynucleotide, wherein said repair results in a mutation comprising an insertion, deletion, or substitution of one or more nucleotides of said target polynucleotide. In some embodiments, said mutation results in one or more amino acid changes in a protein expressed from a gene comprising the target sequence.
  • the method further comprises delivering one or more vectors to said eukaryotic cell, wherein the one or more vectors drive expression of one or more of: the CRISPR enzyme, the guide sequence linked to the tracr mate sequence, and the tracr sequence.
  • said vectors are delivered to the eukaryotic cell in a subject.
  • said modifying takes place in said eukaryotic cell in a cell culture.
  • the method further comprises isolating said eukaryotic cell from a subject prior to said modifying.
  • the method further comprises returning said eukaryotic cell and/or cells derived therefrom to said subject.
  • the invention provides a method of modifying expression of a polynucleotide in a eukaryotic cell.
  • the method comprises allowing a CRISPR complex to bind to the polynucleotide such that said binding results in increased or decreased expression of said polynucleotide; wherein the CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence hybridized to a target sequence within said polynucleotide, wherein said guide sequence is linked to a tracr mate sequence which in turn hybridizes to a tracr sequence.
  • the method further comprises delivering one or more vectors to said eukaryotic cells, wherein the one or more vectors drive expression of one or more of: the CRISPR enzyme, the guide sequence linked to the tracr mate sequence, and the tracr sequence.
  • the invention provides a method of generating a model eukaryotic cell comprising a mutated disease gene.
  • a disease gene is any gene associated an increase in the risk of having or developing a disease.
  • the method comprises (a) introducing one or more vectors into a eukaryotic cell, wherein the one or more vectors drive expression of one or more of: a CRISPR enzyme, a guide sequence linked to a tracr mate sequence, and a tracr sequence; and (b) allowing a CRISPR complex to bind to a target polynucleotide to effect cleavage of the target polynucleotide within said disease gene, wherein the CRISPR complex comprises the CRISPR enzyme complexed with (1) the guide sequence that is hybridized to the target sequence within the target polynucleotide, and (2) the tracr mate sequence that is hybridized to the tracr sequence, thereby generating a model eukaryotic cell comprising
  • said cleavage comprises cleaving one or two strands at the location of the target sequence by said CRISPR enzyme. In some embodiments, said cleavage results in decreased transcription of a target gene. In some embodiments, the method further comprises repairing said cleaved target polynucleotide by homologous recombination with an exogenous template polynucleotide, wherein said repair results in a mutation comprising an insertion, deletion, or substitution of one or more nucleotides of said target polynucleotide. In some embodiments, said mutation results in one or more amino acid changes in a protein expression from a gene comprising the target sequence.
  • the invention provides a method for developing a biologically active agent that modulates a cell signaling event associated with a disease gene.
  • a disease gene is any gene associated an increase in the risk of having or developing a disease.
  • the method comprises (a) contacting a test compound with a model cell of any one of the described embodiments; and (b) detecting a change in a readout that is indicative of a reduction or an augmentation of a cell signaling event associated with said mutation in said disease gene, thereby developing said biologically active agent that modulates said cell signaling event associated with said disease gene.
  • the invention provides a recombinant polynucleotide comprising a guide sequence upstream of a tracr mate sequence, wherein the guide sequence when expressed directs sequence-specific binding of a CRISPR complex to a corresponding target sequence present in a eukaryotic cell.
  • the target sequence is a viral sequence present in a eukaryotic cell.
  • the target sequence is a proto-oncogene or an oncogene.
  • the invention provides for a method of selecting one or more prokaryotic cell(s) by introducing one or more mutations in a gene in the one or more prokaryotic cell (s), the method comprising: introducing one or more vectors into the prokaryotic cell (s), wherein the one or more vectors drive expression of one or more of: a CRISPR enzyme, a guide sequence linked to a tracr mate sequence, a tracr sequence, and a editing template; wherein the editing template comprises the one or more mutations that abolish CRISPR enzyme cleavage; allowing homologous recombination of the editing template with the target polynucleotide in the cell(s) to be selected; allowing a CRISPR complex to bind to a target polynucleotide to effect cleavage of the target polynucleotide within said gene, wherein the CRISPR complex comprises the CRISPR enzyme complexed with (1) the guide sequence that is hybridized to the target sequence within the target polynu
  • the CRISPR enzyme is Cas9.
  • the cell to be selected may be a eukaryotic cell. Aspects of the invention allow for selection of specific cells without requiring a selection marker or a two-step process that may include a counter-selection system.
  • FIG. 1 shows a schematic model of the CRISPR system.
  • the Cas9 nuclease from Streptococcus pyogenes (yellow) is targeted to genomic DNA by a synthetic guide RNA (sgRNA) consisting of a 20-nt guide sequence (blue) and a scaffold (red).
  • the guide sequence base-pairs with the DNA target (blue), directly upstream of a requisite 5′-NGG protospacer adjacent motif (PAM; magenta), and Cas9 mediates a double-stranded break (DSB) ⁇ 3 bp upstream of the PAM (red triangle).
  • PAM magenta
  • FIGS. 2A-F show an exemplary CRISPR system, a possible mechanism of action, an example adaptation for expression in eukaryotic cells, and results of tests assessing nuclear localization and CRISPR activity.
  • FIG. 2C discloses SEQ ID NOS 279-280, respectively, in order of appearance.
  • FIG. 2E discloses SEQ ID NOS 281-283, respectively, in order of appearance.
  • FIG. 2F discloses SEQ ID NOS 284-288, respectively, in order of appearance.
  • FIG. 3 shows an exemplary expression cassette for expression of CRISPR system elements in eukaryotic cells, predicted structures of example guide sequences, and CRISPR system activity as measured in eukaryotic and prokaryotic cells (SEQ ID NOS 289-298, respectively, in order of appearance).
  • FIGS. 4A-D show results of an evaluation of SpCas9 specificity for an example target.
  • FIG. 4A discloses SEQ ID NOS 299, 282 and 300-310, respectively, in order of appearance.
  • FIG. 4C discloses SEQ ID NO: 299.
  • FIGS. 5A-G show an exemplary vector system and results for its use in directing homologous recombination in eukaryotic cells.
  • FIG. 5E discloses SEQ ID NO: 311.
  • FIG. 5F discloses SEQ ID NOS 312-313, respectively, in order of appearance.
  • FIG. 5G discloses SEQ ID NOS 314-318, respectively, in order of appearance.
  • FIG. 6 provides a table of protospacer sequences (SEQ ID NOS 33, 32, 31, 322-327, 35, 34 and 330-334, respectively, in order of appearance) and summarizes modification efficiency results for protospacer targets designed based on exemplary S. pyogenes and S. thermophilus CRISPR systems with corresponding PAMs against loci in human and mouse genomes.
  • FIGS. 7A-C show a comparison of different tracrRNA transcripts for Cas9-mediated gene targeting.
  • FIG. 7A discloses SEQ ID NOS 335-336, respectively, in order of appearance.
  • FIG. 8 shows a schematic of a surveyor nuclease assay for detection of double strand break-induced micro-insertions and -deletions.
  • FIGS. 9A-B show exemplary bicistronic expression vectors for expression of CRISPR system elements in eukaryotic cells.
  • FIG. 9A discloses SEQ ID NOS 337-339, respectively, in order of appearance.
  • FIG. 9B discloses SEQ ID NOS 340-342, respectively, in order of appearance.
  • FIG. 10 shows a bacterial plasmid transformation interference assay, expression cassettes and plasmids used therein, and transformation efficiencies of cells used therein.
  • FIG. 10A discloses SEQ ID NOS 343-345, respectively, in order of appearance.
  • FIGS. 11A-C show histograms of distances between adjacent S. pyogenes SF370 locus 1 PAM (NGG) ( FIG. 10A ) and S. thermophilus LMD9 locus 2 PAM (NNAGAAW) ( FIG. 10B ) in the human genome; and distances for each PAM by chromosome (Chi) ( FIG. 10C ).
  • FIGS. 12A-C show an exemplary CRISPR system, an example adaptation for expression in eukaryotic cells, and results of tests assessing CRISPR activity.
  • FIG. 12B discloses SEQ ID NOS 346-347, respectively, in order of appearance.
  • FIG. 12C discloses SEQ ID NO: 348.
  • FIGS. 13A-C show exemplary manipulations of a CRISPR system for targeting of genomic loci in mammalian cells.
  • FIG. 13A discloses SEQ ID NO: 349.
  • FIG. 13B discloses SEQ ID NOS 350-352, respectively, in order of appearance.
  • FIGS. 14A-B show the results of a Northern blot analysis of crRNA processing in mammalian cells.
  • FIG. 14A discloses SEQ ID NO: 353.
  • FIG. 15 shows an exemplary selection of protospacers in the human PVALB and mouse Th loci.
  • FIG. 15A discloses SEQ ID NO: 354.
  • FIG. 15B discloses SEQ ID NO: 355.
  • FIG. 16 shows example protospacer and corresponding PAM sequence targets of the S. thermophilus CRISPR system in the human EMX1 locus (SEQ ID NO: 348).
  • FIG. 17 provides a table of sequences for primers and probes (SEQ ID NOS 36-39 and 356-363, respectively, in order of appearance) used for Surveyor, RFLP, genomic sequencing, and Northern blot assays.
  • FIGS. 18A-C show exemplary manipulation of a CRISPR system with chimeric RNAs and results of SURVEYOR assays for system activity in eukaryotic cells.
  • FIG. 18A discloses SEQ ID NO: 364, respectively, in order of appearance.
  • FIGS. 19A-B show a graphical representation of the results of SURVEYOR assays for CRISPR system activity in eukaryotic cells (SEQ ID NOS 365-443, respectively, in order of appearance).
  • FIG. 20 shows an exemplary visualization of some S. pyogenes Cas9 target sites in the human genome using the UCSC genome browser.
  • FIG. 21 shows predicted secondary structures for exemplary chimeric RNAs comprising a guide sequence, tracr mate sequence, and tracr sequence (SEQ ID NOS 444-463, respectively, in order of appearance).
  • FIG. 22 shows exemplary bicistronic expression vectors for expression of CRISPR system elements in eukaryotic cells (SEQ ID NOS 464 and 341-342, respectively, in order of appearance).
  • FIG. 23 shows that Cas9 nuclease activity against endogenous targets may be exploited for genome editing.
  • the CRISPR targeting construct directed cleavage of a chromosomal locus and was co-transformed with an editing template that recombined with the target to prevent cleavage.
  • Kanamycin-resistant transformants that survived CRISPR attack contained modifications introduced by the editing template.
  • tracr trans-activating CRISPR RNA; aphA-3, kanamycin resistance gene.
  • FIG. 24 shows analysis of PAM and seed sequences that eliminate Cas9 cleavage.
  • PCR products with randomized PAM sequences or randomized seed sequences were transformed in crR6 cells (SEQ ID NOS 465-469, respectively, in order of appearance). These cells expressed Cas9 loaded with a crRNA that targeted a chromosomal region of R6 8232.5 cells (highlighted in pink) that is absent from the R6 genome. More than 2 ⁇ 105 chloramphenicol-resistant transformants, carrying inactive PAM or seed sequences, were combined for amplification and deep sequencing of the target region.
  • the relative abundance for each 3-nucleotide PAM sequence is shown. Severely underrepresented sequences (NGG) are shown in red; partially underrepresented one in orange (NAG) (c) Relative proportion of number of reads after transformation of the random seed sequence constructs in crR6 cells (compared to number of reads in R6 transformants). The relative abundance of each nucleotide for each position of the first 20 nucleotides of the protospacer sequence is shown (SEQ ID NO: 470). High abundance indicates lack of cleavage by Cas9, i.e. a CRISPR inactivating mutation. The grey line shows the level of the WT sequence. The dotted line represents the level above which a mutation significantly disrupts cleavage (See section “Analysis of deep sequencing data” in Example 5)
  • FIG. 25 shows introduction of single and multiple mutations using the CRISPR system in S. pneumoniae .
  • Transformation efficiency of cells transformed with targeting constructs in the presence of an editing template or control are shown.
  • FIG. 26 provides mechanisms underlying editing using the CRISPR system.
  • a stop codon was introduced in the erythromycin resistance gene ermAM to generate strain JEN53.
  • the wild-type sequence can be restored by targeting the stop codon with the CRISPR::ermAM(stop) construct, and using the ermAM wild-type sequence as an editing template.
  • (b) Mutant and wild-type ermAM sequences (SEQ ID NOS 476-479, respectively, in order of appearance).
  • (c) Fraction of erythromicyn-resistant (erm R ) cfu calculated from total or kanamycin-resistant (kan R ) cfu.
  • FIG. 27 illustrates genome editing with the CRISPR system in E. coli .
  • a kanamycin-resistant plasmid carrying the CRISPR array (pCRISPR) targeting the gene to edit may be transformed in the HME63 recombineering strain containing a chloramphenicol-resistant plasmid harboring cas9 and tracr (pCas9), together with an oligonucleotide specifying the mutation.
  • pCRISPR chloramphenicol-resistant plasmid harboring cas9 and tracr
  • FIG. 28 illustrates the transformation of crR6 genomic DNA leads to editing of the targeted locus
  • the IS1167 element of S. pneumoniae R6 was replaced by the CRISPR01 locus of S. pyogenes SF370 to generate crR6 strain.
  • This locus encodes for the Cas9 nuclease, a CRISPR array with six spacers, the tracrRNA that is required for crRNA biogenesis and Cast, Cas2 and Csn2, proteins not necessary for targeting.
  • Strain crR6M contains a minimal functional CRISPR system without cas1, cast and csn2.
  • the aphA-3 gene encodes kanamycin resistance.
  • Protospacers from the streptococcal bacteriophages ⁇ 8232.5 and ⁇ 370.1 were fused to a chloramphenicol resistance gene (cat) and integrated in the srtA gene of strain R6 to generate strains R68232.5 and R6370.1.
  • Right panel PCR analysis of 8 R6 8232.5 transformants with crR6 genomic DNA. Primers that amplify the srtA locus were used for PCR. 7/8 genotyped colonies replaced the R68232.5 srtA locus by the WT locus from the crR6 genomic DNA.
  • FIG. 29 provides chromatograms of DNA sequences of edited cells obtained in this study. In all cases the wild-type and mutant protospacer and PAM sequences (or their reverse complement) are indicated. When relevant, the amino acid sequence encoded by the protospacer is provided. For each editing experiment, all strains for which PCR and restriction analysis corroborated the introduction of the desired modification were sequenced. A representative chromatogram is shown.
  • (b) Chromatograms for the introduction of the R>A and NE>AA mutations into ⁇ -galactosidase (bgaA) FIG.
  • FIG. 30 illustrates CRISPR immunity against random S. pneumoniae targets containing different PAMs.
  • FIG. 31 provides a general scheme for targeted genome editing.
  • crR6M was further engineered to contain tracrRNA, Cas9 and only one repeat of the CRISPR array followed by kanamycin resistance marker (aphA-3), generating strain crR6Rk.
  • DNA from this strain is used as a template for PCR with primers designed to introduce a new spacer (green box designated with N).
  • the left and right PCRs are assembled using the Gibson method to create the targeting construct.
  • Both the targeting and editing constructs are then transformed into strain crR6Rc, which is a strain equivalent to crR6Rk but has the kanamycin resistance marker replaced by a chloramphenicol resistance marker (cat). About 90% of the kanamycin-resistant transformants contain the desired mutation.
  • FIG. 32 illustrates the distribution of distances between PAMs. NGG and CCN that are considered to be valid PAMs. Data is shown for the S. pneumoniae R6 genome as well as for a random sequence of the same length and with the same GC-content (39.7%). The dotted line represents the average distance (12) between PAMs in the R6 genome.
  • FIG. 33 illustrates CRISPR-mediated editing of the ermAM locus using genomic DNA as targeting construct.
  • genomic DNA To use genomic DNA as targeting construct it is necessary to avoid CRISPR autoimmunity, and therefore a spacer against a sequence not present in the chromosome must be used (in this case the ermAM erythromycin resistance gene).
  • SEQ ID NOS 492-495 A schematic for CRISPR-mediated editing of the ermAM locus using genomic DNA.
  • a construct carrying an ermAM-targeting spacer (blue box) is made by PCR and Gibson assembly, and transformed into strain crR6Rc, generating strain JEN37.
  • the genomic DNA of JEN37 was then used as a targeting construct, and was co-transformed with the editing template into JEN38, a strain in which the srtA gene was replaced by a wild-type copy of ermAM.
  • Kanamycin-resistant transformants contain the edited genotype (JEN43).
  • FIG. 34 illustrates sequential introduction of mutations by CRISPR-mediated genome editing.
  • R6 is engineered to generate crR6Rk.
  • crR6Rk is co-transformed with a srtA-targeting construct fused to cat for chloramphenicol selection of edited cells, along with an editing construct for a ⁇ srtA in-frame deletion.
  • Strain crR6 ⁇ srtA is generated by selection on chlramphenicol.
  • the ⁇ srtA strain is co-transformed with a bgaA-targeting construct fused to aphA-3 for kanamycin selection of edited cells, and an editing construct containing a ⁇ bgaA in-frame deletion.
  • the engineered CRISPR locus can be erased from the chromosome by first co-transforming R6DNA containing the wild-type IS1167 locus and a plasmid carrying a bgaA protospacer (pDB97), and selection on spectinomycin.
  • pDB97 bgaA protospacer
  • FIG. 35 illustrates the background mutation frequency of CRISPR in S. pneumoniae .
  • FIG. 36 illustrates that the essential elements of the S. pyogenes CRISPR locus 1 are reconstituted in E. coli using pCas9.
  • the plasmid contained tracrRNA, Cas9, as well as a leader sequence driving the crRNA array.
  • the pCRISPR plasmids contained the leader and the array only. Spacers may be inserted into the crRNA array between BsaI sites using annealed oligonucleotides (SEQ ID NOS 343, 500 and 127, respectively, in order of appearance). Oligonucleotide design is shown at bottom.
  • pCas9 carried chloramphenicol resistance (CmR) and is based on the low-copy pACYC184 plasmid backbone.
  • CmR chloramphenicol resistance
  • pCRISPR is based on the high-copy number pZE21 plasmid. Two plasmids were required because a pCRISPR plasmid containing a spacer targeting the E. coli chromosome may not be constructed using this organism as a cloning host if Cas9 is also present (it will kill the host).
  • FIG. 37 illustrates CRISPR-directed editing in E. coli MG1655.
  • An oligonucleotide (W542) carrying a point mutation that both confers streptomycin resistance and abolishes CRISPR immunity, together with a plasmid targeting rpsL (pCRISPR::rpsL) or a control plasmid (pCRISPR:: ⁇ ) were co-transformed into wild-type E. coli strain MG1655 containing pCas9. Transformants were selected on media containing either streptomycin or kanamycin. Dashed line indicates limit of detection of the transformation assay.
  • FIG. 38 illustrates the background mutation frequency of CRISPR in E. coli HME63.
  • FIGS. 39A-D show a circular depiction of the phylogenetic analysis revealing five families of Cas9s, including three groups of large Cas9s ( ⁇ 1400 amino acids) and two of small Cas9s ( ⁇ 1100 amino acids).
  • FIGS. 40A-F show the linear depiction of the phylogenetic analysis revealing five families of Cas9s, including three groups of large Cas9s ( ⁇ 1400 amino acids) and two of small Cas9s ( ⁇ 1100 amino acids).
  • FIG. 41A-M shows sequences where the mutation points are located within the SpCas9 gene (SEQ ID NOS 501-502, respectively, in order of appearance).
  • FIG. 42 shows a schematic construct in which the transcriptional activation domain (VP64) is fused to Cas9 with two mutations in the catalytic domains (D10 and H840).
  • FIG. 43A-D shows genome editing via homologous recombination.
  • FIGS. 44A-B show single vector designs for SpCas9.
  • FIG. 44A discloses SEQ ID NOS 320-321 and 328, respectively, in order of appearance.
  • FIG. 44B discloses SEQ ID NO: 329.
  • FIG. 45 shows quantification of cleavage of NLS-Csn1 constructs NLS-Csn1, Csn1, Csn1-NLS, NLS-Csn1-NLS, NLS-Csn1-GFP-NLS and UnTFN.
  • FIG. 46 shows index frequency of NLS-Cas9, Cas9, Cas9-NLS and NLS-Cas9-NLS.
  • FIG. 47 shows a gel demonstrating that SpCas9 with nickase mutations (individually) do not induce double strand breaks.
  • FIG. 48 shows a design of the oligo DNA used as Homologous Recombination (HR) template in this experiment and a comparison of HR efficiency induced by different combinations of Cas9 protein and HR template.
  • FIG. 49A shows the Conditional Cas9, Rosa 26 targeting vector map.
  • FIG. 49B shows the Constitutive Cas9, Rosa 26 targeting vector map.
  • FIG. 50A-H show the sequences of each element present in the vector maps of FIGS. 49A-B (SEQ ID NOS 507-516, respectively, in order of appearance).
  • FIG. 51 shows a schematic of the important elements in the Constitutive and Conditional Cas9 constructs.
  • FIG. 52 shows the functional validation of the expression of Constitutive and Conditional Cas9 constructs.
  • FIG. 53 shows the validation of Cas9 nuclease activity by Surveyor.
  • FIG. 54 shows the quantification of Cas9 nuclease activity.
  • FIG. 55 shows construct design and homologous recombination (HR) strategy.
  • FIG. 56 shows the genomic PCR genotyping results for the constitutive (Right) and conditional (Left) constructs at two different gel exposure times (top row for 3 min and bottom row for 1 min).
  • FIG. 57 shows Cas9 activation in mESCs.
  • FIG. 58 shows a schematic of the strategy used to mediate gene knockout via NHEJ using a nickase version of Cas9 along with two guide RNAs.
  • FIG. 59 shows how DNA double-strand break (DSB) repair promotes gene editing.
  • NHEJ error-prone non-homologous end joining
  • Indel random insertion/deletion
  • a repair template in the form of a plasmid or single-stranded oligodeoxynucleotides (ssODN) can be supplied to leverage the homology-directed repair (HDR) pathway, which allows high fidelity and precise editing.
  • FIG. 60 shows the timeline and overview of experiments. Steps for reagent design, construction, validation, and cell line expansion. Custom sgRNAs (light blue bars) for each target, as well as genotyping primers, are designed in silico via our online design tool (available at the website genome-engineering.org/tools). sgRNA expression vectors are then cloned into a plasmid containing Cas9 (PX330) and verified via DNA sequencing. Completed plasmids (pCRISPRs), and optional repair templates for facilitating homology directed repair, are then transfected into cells and assayed for ability to mediate targeted cleavage. Finally, transfected cells can be clonally expanded to derive isogenic cell lines with defined mutations.
  • Custom sgRNAs light blue bars
  • genotyping primers are designed in silico via our online design tool (available at the website genome-engineering.org/tools).
  • sgRNA expression vectors are then cloned into a
  • FIG. 61A-C shows Target selection and reagent preparation.
  • 20-bp targets (highlighted in blue) must be followed by 5′-NGG, which can occur in either strand on genomic DNA. We recommend using the online tool described in this protocol in aiding target selection (www.genome-engineering.org/tools).
  • U6 Fwd U6 reverse primer
  • U6 Rev U6 reverse primer
  • the guide oligos (blue N's) contain overhangs for ligation into the pair of BbsI sites on PS330, with the top and bottom strand orientations matching those of the genomic target (i.e. top oligo is the 20-bp sequence preceding 5′-NGG in genomic DNA). Digestion of PX330 with BbsI allows the replacement of the Type IIs restriction sites (blue outline) with direct insertion of annealed oligos. It is worth noting that an extra G was placed before the first base of the guide sequence. Applicants have found that an extra G in front of the guide sequence does not adversely affect targeting efficiency.
  • the extra guanine will ensure the sgRNA is efficiently transcribed by the U6 promoter, which prefers a guanine in the first base of the transcript (SEQ ID NOS 320-321 and 328, respectively, in order of appearance).
  • FIG. 62A-D shows the anticipated results for multiplex NHEJ.
  • sgRNAs Two sgRNAs (orange and blue bars) are designed to target the human GRIN2B and DYRK1A loci. SURVEYOR gel shows modification at both loci in transfected cells. Colored arrows indicated expected fragment sizes for each locus.
  • a pair of sgRNAs (light blue and green bars) are designed to excise an exon (dark blue) in the human EMX1 locus.
  • Target sequences and PAMs red are shown in respective colors, and sites of cleavage indicated by red triangle. Predicted junction is shown below.
  • Two pairs of sgRNAs (3.1, 3.2 left-flanking sgRNAs; 4.1, 4.2, right flanking sgRNAs) are used to mediate deletions of variable sizes around one EMX1 exon.
  • Transfected cells are clonally isolated and expanded for genotyping analysis for deletions and inversion events. Of the 105 clones are screened, 51 (49%) and 11 (10%) carrying heterozygous and homozygous deletions, respectively. Approximate deletion sizes are given since junctions may be variable.
  • FIG. 63A-C shows the application of ssODNs and targeting vector to mediate HR with both wildtype and nickase mutant of Cas9 in HEK293FT and HUES9 cells with efficiencies ranging from 1.0-27%.
  • FIG. 63B discloses SEQ ID NOS 503-505, 503, 506 and 505, respectively, in order of appearance.
  • FIG. 64 shows a schematic of a PCR-based method for rapid and efficient CRISPR targeting in mammalian cells.
  • a plasmid containing the human RNA polymerase III promoter U6 is PCR-amplified using a U6-specific forward primer and a reverse primer carrying the reverse complement of part of the U6 promoter, the sgRNA(+85) scaffold with guide sequence, and 7 T nucleotides for transcriptional termination.
  • the resulting PCR product is purified and co-delivered with a plasmid carrying Cas9 driven by the CBh promoter (SEQ ID NOS 517, 523, 518 and 524-525, respectively, in order of appearance).
  • FIG. 65 shows SURVEYOR Mutation Detection Kit from Transgenomics results for each gRNA and respective controls.
  • a positive SURVEYOR result is one large band corresponding to the genomic PCR and two smaller bands that are the product of the SURVEYOR nuclease making a double-strand break at the site of a mutation.
  • Each gRNA was validated in the mouse cell line, Neuro-N2a, by liposomal transient co-transfection with hSpCas9. 72 hours post-transfection genomic DNA was purified using QuickExtract DNA from Epicentre. PCR was performed to amplify the locus of interest.
  • FIG. 66 shows Surveyor results for 38 live pups (lanes 1-38) 1 dead pup (lane 39) and 1 wild-type pup for comparison (lane 40).
  • Pups 1-19 were injected with gRNA Chd8.2 and pups 20-38 were injected with gRNA Chd8.3.
  • 13 were positive for a mutation.
  • the one dead pup also had a mutation.
  • Genomic PCR sequencing was consistent with the SURVEYOR assay findings (SEQ ID NOS 526-528, respectively, in order of appearance).
  • FIG. 67 shows a design of different Cas9 NLS constructs. All Cas9 were the human-codon-optimized version of the Sp Cas9. NLS sequences are linked to the cas9 gene at either N-terminus or C-terminus. All Cas9 variants with different NLS designs were cloned into a backbone vector containing so it is driven by EF1a promoter. On the same vector there is a chimeric RNA targeting human EMX1 locus driven by U6 promoter, together forming a two-component system.
  • FIG. 69A shows a design of the CRISPR-TF (Transcription Factor) with transcriptional activation activity.
  • the chimeric RNA is expressed by U6 promoter, while a human-codon-optimized, double-mutant version of the Cas9 protein (hSpCas9m), operably linked to triple NLS and a VP64 functional domain is expressed by a EF1a promoter.
  • the double mutations, D10A and H840A renders the cas9 protein unable to introduce any cleavage but maintained its capacity to bind to target DNA when guided by the chimeric RNA.
  • FIG. 69B shows transcriptional activation of the human SOX2 gene with CRISPR-TF system (Chimeric RNA and the Cas9-NLS-VP64 fusion protein).
  • 293FT cells were transfected with plasmids bearing two components: (1) U6-driven different chimeric RNAs targeting 20-bp sequences within or around the human SOX2 genomic locus, and (2) EF1a-driven hSpCas9m (double mutant)-NLS-VP64 fusion protein. 96 hours post transfection, 293FT cells were harvested and the level of activation is measured by the induction of mRNA expression using a qRT-PCR assay.
  • FIG. 70 depicts NLS architecture optimization for SpCas9.
  • FIG. 71 shows a QQ plot for NGGNN sequences.
  • FIG. 72 shows a histogram of the data density with fitted normal distribution (black line) and 0.99 quantile (dotted line).
  • FIG. 73A-C shows RNA-guided repression of bgaA expression by dgRNA::cas9**.
  • the Cas9 protein binds to the tracrRNA, and to the precursor CRISPR RNA which is processed by RNAseIII to form the crRNA. The crRNA directs binding of Cas9 to the bgaA promoter and represses transcription.
  • the targets used to direct Cas9** to the bgaA promoter are represented (SEQ ID NO: 529). Putative ⁇ 35, ⁇ 10 as well as the bgaA start codon are in bold.
  • Betagalactosidase activity as measure by Miller assay in the absence of targeting and for the four different targets.
  • FIG. 74A-E shows characterization of Cas9** mediated repression.
  • a The gfpmut2 gene and its promoter, including the ⁇ 35 and ⁇ 10 signals are represented together with the position of the different target sites used the study.
  • b Relative fluorescence upon targeting of the coding strand.
  • c Relative fluorescence upon targeting of the non-coding strand.
  • d Northern blot with probes B477 and B478 on RNA extracted from T5, T10, B10 or a control strain without a target.
  • e Effect of an increased number of mutations in the 5′ end of the crRNA of B1, T5 and B10.
  • polynucleotide refers to a polymeric form of nucleotides of any length, either deoxyribonucleotides or ribonucleotides, or analogs thereof.
  • Polynucleotides may have any three dimensional structure, and may perform any function, known or unknown.
  • polynucleotides coding or non-coding regions of a gene or gene fragment, loci (locus) defined from linkage analysis, exons, introns, messenger RNA (mRNA), transfer RNA, ribosomal RNA, short interfering RNA (siRNA), short-hairpin RNA (shRNA), micro-RNA (miRNA), ribozymes, cDNA, recombinant polynucleotides, branched polynucleotides, plasmids, vectors, isolated DNA of any sequence, isolated RNA of any sequence, nucleic acid probes, and primers.
  • loci locus defined from linkage analysis, exons, introns, messenger RNA (mRNA), transfer RNA, ribosomal RNA, short interfering RNA (siRNA), short-hairpin RNA (shRNA), micro-RNA (miRNA), ribozymes, cDNA, recombinant polynucleotides, branched poly
  • a polynucleotide may comprise one or more modified nucleotides, such as methylated nucleotides and nucleotide analogs. If present, modifications to the nucleotide structure may be imparted before or after assembly of the polymer. The sequence of nucleotides may be interrupted by non-nucleotide components. A polynucleotide may be further modified after polymerization, such as by conjugation with a labeling component.
  • chimeric RNA refers to the polynucleotide sequence comprising the guide sequence, the tracr sequence and the tracr mate sequence.
  • guide sequence refers to the about 20 bp sequence within the guide RNA that specifies the target site and may be used interchangeably with the terms “guide” or “spacer”.
  • tracr mate sequence may also be used interchangeably with the term “direct repeat(s)”.
  • wild type is a term of the art understood by skilled persons and means the typical form of an organism, strain, gene or characteristic as it occurs in nature as distinguished from mutant or variant forms.
  • variable should be taken to mean the exhibition of qualities that have a pattern that deviates from what occurs in nature.
  • nucleic acid molecules or polypeptides mean that the nucleic acid molecule or the polypeptide is at least substantially free from at least one other component with which they are naturally associated in nature and as found in nature.
  • “Complementarity” refers to the ability of a nucleic acid to form hydrogen bond(s) with another nucleic acid sequence by either traditional Watson-Crick base pairing or other non-traditional types.
  • a percent complementarity indicates the percentage of residues in a nucleic acid molecule which can form hydrogen bonds (e.g., Watson-Crick base pairing) with a second nucleic acid sequence (e.g., 5, 6, 7, 8, 9, 10 out of 10 being 50%, 60%, 70%, 80%, 90%, and 100% complementary).
  • Perfectly complementary means that all the contiguous residues of a nucleic acid sequence will hydrogen bond with the same number of contiguous residues in a second nucleic acid sequence.
  • “Substantially complementary” as used herein refers to a degree of complementarity that is at least 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99%, or 100% over a region of 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 35, 40, 45, 50, or more nucleotides, or refers to two nucleic acids that hybridize under stringent conditions.
  • stringent conditions for hybridization refer to conditions under which a nucleic acid having complementarity to a target sequence predominantly hybridizes with the target sequence, and substantially does not hybridize to non-target sequences. Stringent conditions are generally sequence-dependent, and vary depending on a number of factors. In general, the longer the sequence, the higher the temperature at which the sequence specifically hybridizes to its target sequence. Non-limiting examples of stringent conditions are described in detail in Tijssen (1993), Laboratory Techniques In Biochemistry And Molecular Biology-Hybridization With Nucleic Acid Probes Part I, Second Chapter “Overview of principles of hybridization and the strategy of nucleic acid probe assay”, Elsevier, N.Y.
  • Hybridization refers to a reaction in which one or more polynucleotides react to form a complex that is stabilized via hydrogen bonding between the bases of the nucleotide residues.
  • the hydrogen bonding may occur by Watson Crick base pairing, Hoogstein binding, or in any other sequence specific manner.
  • the complex may comprise two strands forming a duplex structure, three or more strands forming a multi stranded complex, a single self hybridizing strand, or any combination of these.
  • a hybridization reaction may constitute a step in a more extensive process, such as the initiation of PCR, or the cleavage of a polynucleotide by an enzyme.
  • a sequence capable of hybridizing with a given sequence is referred to as the “complement” of the given sequence.
  • expression refers to the process by which a polynucleotide is transcribed from a DNA template (such as into and mRNA or other RNA transcript) and/or the process by which a transcribed mRNA is subsequently translated into peptides, polypeptides, or proteins.
  • Transcripts and encoded polypeptides may be collectively referred to as “gene product.” If the polynucleotide is derived from genomic DNA, expression may include splicing of the mRNA in a eukaryotic cell.
  • polypeptide refers to polymers of amino acids of any length.
  • the polymer may be linear or branched, it may comprise modified amino acids, and it may be interrupted by non amino acids.
  • the terms also encompass an amino acid polymer that has been modified; for example, disulfide bond formation, glycosylation, lipidation, acetylation, phosphorylation, or any other manipulation, such as conjugation with a labeling component.
  • amino acid includes natural and/or unnatural or synthetic amino acids, including glycine and both the D or L optical isomers, and amino acid analogs and peptidomimetics.
  • subject refers to a vertebrate, preferably a mammal, more preferably a human.
  • Mammals include, but are not limited to, murines, simians, humans, farm animals, sport animals, and pets. Tissues, cells and their progeny of a biological entity obtained in vivo or cultured in vitro are also encompassed.
  • therapeutic agent refers to a molecule or compound that confers some beneficial effect upon administration to a subject.
  • the beneficial effect includes enablement of diagnostic determinations; amelioration of a disease, symptom, disorder, or pathological condition; reducing or preventing the onset of a disease, symptom, disorder or condition; and generally counteracting a disease, symptom, disorder or pathological condition.
  • treatment or “treating,” or “palliating” or “ameliorating” are used interchangeably. These terms refer to an approach for obtaining beneficial or desired results including but not limited to a therapeutic benefit and/or a prophylactic benefit.
  • therapeutic benefit is meant any therapeutically relevant improvement in or effect on one or more diseases, conditions, or symptoms under treatment.
  • the compositions may be administered to a subject at risk of developing a particular disease, condition, or symptom, or to a subject reporting one or more of the physiological symptoms of a disease, even though the disease, condition, or symptom may not have yet been manifested.
  • an effective amount refers to the amount of an agent that is sufficient to effect beneficial or desired results.
  • the therapeutically effective amount may vary depending upon one or more of: the subject and disease condition being treated, the weight and age of the subject, the severity of the disease condition, the manner of administration and the like, which can readily be determined by one of ordinary skill in the art.
  • the term also applies to a dose that will provide an image for detection by any one of the imaging methods described herein.
  • the specific dose may vary depending on one or more of: the particular agent chosen, the dosing regimen to be followed, whether it is administered in combination with other compounds, timing of administration, the tissue to be imaged, and the physical delivery system in which it is carried.
  • Vectors can be designed for expression of CRISPR transcripts (e.g. nucleic acid transcripts, proteins, or enzymes) in prokaryotic or eukaryotic cells.
  • CRISPR transcripts e.g. nucleic acid transcripts, proteins, or enzymes
  • CRISPR transcripts can be expressed in bacterial cells such as Escherichia coli , insect cells (using baculovirus expression vectors), yeast cells, or mammalian cells. Suitable host cells are discussed further in Goeddel, GENE EXPRESSION TECHNOLOGY: METHODS IN ENZYMOLOGY 185, Academic Press, San Diego, Calif. (1990).
  • the recombinant expression vector can be transcribed and translated in vitro, for example using T7 promoter regulatory sequences and T7 polymerase.
  • Vectors may be introduced and propagated in a prokaryote.
  • a prokaryote is used to amplify copies of a vector to be introduced into a eukaryotic cell or as an intermediate vector in the production of a vector to be introduced into a eukaryotic cell (e.g. amplifying a plasmid as part of a viral vector packaging system).
  • a prokaryote is used to amplify copies of a vector and express one or more nucleic acids, such as to provide a source of one or more proteins for delivery to a host cell or host organism.
  • Fusion vectors add a number of amino acids to a protein encoded therein, such as to the amino terminus of the recombinant protein.
  • Such fusion vectors may serve one or more purposes, such as: (i) to increase expression of recombinant protein; (ii) to increase the solubility of the recombinant protein; and (iii) to aid in the purification of the recombinant protein by acting as a ligand in affinity purification.
  • a proteolytic cleavage site is introduced at the junction of the fusion moiety and the recombinant protein to enable separation of the recombinant protein from the fusion moiety subsequent to purification of the fusion protein.
  • Such enzymes, and their cognate recognition sequences include Factor Xa, thrombin and enterokinase.
  • Example fusion expression vectors include pGEX (Pharmacia Biotech Inc; Smith and Johnson, 1988.
  • GST glutathione S-transferase
  • E. coli expression vectors examples include pTrc (Amrann et al., (1988) Gene 69:301-315) and pET 11d (Studier et al., GENE EXPRESSION TECHNOLOGY: METHODS IN ENZYMOLOGY 185, Academic Press, San Diego, Calif. (1990) 60-89).
  • a vector is a yeast expression vector.
  • yeast Saccharomyces cerivisae examples include pYepSec1 (Baldari, et al., 1987 . EMBO J. 6: 229-234), pMFa (Kuijan and Herskowitz, 1982 . Cell 30: 933-943), pJRY88 (Schultz et al., 1987 . Gene 54: 113-123), pYES2 (Invitrogen Corporation, San Diego, Calif.), and picZ (InVitrogen Corp, San Diego, Calif.).
  • a vector drives protein expression in insect cells using baculovirus expression vectors.
  • Baculovirus vectors available for expression of proteins in cultured insect cells include the pAc series (Smith, et al., 1983 . Mol. Cell. Biol. 3: 2156-2165) and the pVL series (Lucklow and Summers, 1989. Virology 170: 31-39).
  • a vector is capable of driving expression of one or more sequences in mammalian cells using a mammalian expression vector.
  • mammalian expression vectors include pCDM8 (Seed, 1987 . Nature 329: 840) and pMT2PC (Kaufman, et al., 1987 . EMBO J. 6: 187-195).
  • the expression vector's control functions are typically provided by one or more regulatory elements.
  • commonly used promoters are derived from polyoma, adenovirus 2, cytomegalovirus, simian virus 40, and others disclosed herein and known in the art.
  • the recombinant mammalian expression vector is capable of directing expression of the nucleic acid preferentially in a particular cell type (e.g., tissue-specific regulatory elements are used to express the nucleic acid).
  • tissue-specific regulatory elements are known in the art.
  • suitable tissue-specific promoters include the albumin promoter (liver-specific; Pinkert, et al., 1987 . Genes Dev. 1: 268-277), lymphoid-specific promoters (Calame and Eaton, 1988 . Adv. Immunol. 43: 235-275), in particular promoters of T cell receptors (Winoto and Baltimore, 1989 . EMBO J.
  • promoters are also encompassed, e.g., the murine hox promoters (Kessel and Gruss, 1990 . Science 249: 374-379) and the ⁇ -fetoprotein promoter (Campes and Tilghman, 1989 . Genes Dev. 3: 537-546).
  • a regulatory element is operably linked to one or more elements of a CRISPR system so as to drive expression of the one or more elements of the CRISPR system.
  • CRISPRs Clustered Regularly Interspaced Short Palindromic Repeats
  • SPIDRs Sacer Interspersed Direct Repeats
  • the CRISPR locus comprises a distinct class of interspersed short sequence repeats (SSRs) that were recognized in E. coli (Ishino et al., J. Bacteriol., 169:5429-5433 [1987]; and Nakata et al., J.
  • the CRISPR loci typically differ from other SSRs by the structure of the repeats, which have been termed short regularly spaced repeats (SRSRs) (Janssen et al., OMICS J. Integ. Biol., 6:23-33 [2002]; and Mojica et al., Mol. Microbiol., 36:244-246 [2000]).
  • SRSRs short regularly spaced repeats
  • the repeats are short elements that occur in clusters that are regularly spaced by unique intervening sequences with a substantially constant length (Mojica et al., [2000], supra).
  • the repeat sequences are highly conserved between strains, the number of interspersed repeats and the sequences of the spacer regions typically differ from strain to strain (van Embden et al., J.
  • CRISPR loci have been identified in more than 40 prokaryotes (See e.g., Jansen et al., Mol. Microbiol., 43:1565-1575 [2002]; and Mojica et al.,
  • Aeropyrum including, but not limited to Aeropyrum, Pyrobaculum, Sulfolobus, Archaeoglobus, Halocarcula, Methanobacterium, Methanococcus, Methanosarcina, Methanopyrus, Pyrococcus, Picrophilus, Thermoplasma, Corynebacterium, Mycobacterium, Streptomyces, Aquifex, Porphyromonas, Chlorobium, Thermus, Bacillus, Listeria, Staphylococcus, Clostridium, Thermoanaerobacter, Mycoplasma, Fusobacterium, Azarcus, Chromobacterium, Neisseria, Nitrosomonas, Desulfovibrio, Geobacter, Myxococcus, Campylobacter, Wolinella, Acinetobacter, Erwinia, Escherichia, Legionella, Methylococcus, Pasteurella, Photobacterium, Salmonella, Xanthomonas, Y
  • CRISPR system refers collectively to transcripts and other elements involved in the expression of or directing the activity of CRISPR-associated (“Cas”) genes, including sequences encoding a Cas gene, a tracr (trans-activating CRISPR) sequence (e.g. tracrRNA or an active partial tracrRNA), a tracr-mate sequence (encompassing a “direct repeat” and a tracrRNA-processed partial direct repeat in the context of an endogenous CRISPR system), a guide sequence (also referred to as a “spacer” in the context of an endogenous CRISPR system), or other sequences and transcripts from a CRISPR locus.
  • a tracr trans-activating CRISPR
  • tracr-mate sequence encompassing a “direct repeat” and a tracrRNA-processed partial direct repeat in the context of an endogenous CRISPR system
  • guide sequence also referred to as a “spacer” in the context of an endogenous CRISPR system
  • one or more elements of a CRISPR system is derived from a type I, type II, or type III CRISPR system. In some embodiments, one or more elements of a CRISPR system is derived from a particular organism comprising an endogenous CRISPR system, such as Streptococcus pyogenes . In general, a CRISPR system is characterized by elements that promote the formation of a CRISPR complex at the site of a target sequence (also referred to as a protospacer in the context of an endogenous CRISPR system).
  • target sequence refers to a sequence to which a guide sequence is designed to have complementarity, where hybridization between a target sequence and a guide sequence promotes the formation of a CRISPR complex. Full complementarity is not necessarily required, provided there is sufficient complementarity to cause hybridization and promote formation of a CRISPR complex.
  • a target sequence may comprise any polynucleotide, such as DNA or RNA polynucleotides.
  • a target sequence is located in the nucleus or cytoplasm of a cell.
  • the target sequence may be within an organelle of a eukaryotic cell, for example, mitochondrion or chloroplast.
  • a sequence or template that may be used for recombination into the targeted locus comprising the target sequences is referred to as an “editing template” or “editing polynucleotide” or “editing sequence”.
  • an exogenous template polynucleotide may be referred to as an editing template.
  • the recombination is homologous recombination.
  • a CRISPR complex comprising a guide sequence hybridized to a target sequence and complexed with one or more Cas proteins
  • formation of a CRISPR complex results in cleavage of one or both strands in or near (e.g. within 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 50, or more base pairs from) the target sequence.
  • the tracr sequence which may comprise or consist of all or a portion of a wild-type tracr sequence (e.g.
  • a wild-type tracr sequence may also form part of a CRISPR complex, such as by hybridization along at least a portion of the tracr sequence to all or a portion of a tracr mate sequence that is operably linked to the guide sequence.
  • the tracr sequence has sufficient complementarity to a tracr mate sequence to hybridize and participate in formation of a CRISPR complex. As with the target sequence, it is believed that complete complementarity is not needed, provided there is sufficient to be functional.
  • the tracr sequence has at least 50%, 60%, 70%, 80%, 90%, 95% or 99% of sequence complementarity along the length of the tracr mate sequence when optimally aligned.
  • one or more vectors driving expression of one or more elements of a CRISPR system are introduced into a host cell such that expression of the elements of the CRISPR system direct formation of a CRISPR complex at one or more target sites.
  • a Cas enzyme, a guide sequence linked to a tracr-mate sequence, and a tracr sequence could each be operably linked to separate regulatory elements on separate vectors.
  • two or more of the elements expressed from the same or different regulatory elements may be combined in a single vector, with one or more additional vectors providing any components of the CRISPR system not included in the first vector.
  • CRISPR system elements that are combined in a single vector may be arranged in any suitable orientation, such as one element located 5′ with respect to (“upstream” of) or 3′ with respect to (“downstream” of) a second element.
  • the coding sequence of one element may be located on the same or opposite strand of the coding sequence of a second element, and oriented in the same or opposite direction.
  • a single promoter drives expression of a transcript encoding a CRISPR enzyme and one or more of the guide sequence, tracr mate sequence (optionally operably linked to the guide sequence), and a tracr sequence embedded within one or more intron sequences (e.g. each in a different intron, two or more in at least one intron, or all in a single intron).
  • the CRISPR enzyme, guide sequence, tracr mate sequence, and tracr sequence are operably linked to and expressed from the same promoter.
  • a vector comprises one or more insertion sites, such as a restriction endonuclease recognition sequence (also referred to as a “cloning site”).
  • one or more insertion sites e.g. about or more than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more insertion sites are located upstream and/or downstream of one or more sequence elements of one or more vectors.
  • a vector comprises an insertion site upstream of a tracr mate sequence, and optionally downstream of a regulatory element operably linked to the tracr mate sequence, such that following insertion of a guide sequence into the insertion site and upon expression the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell.
  • a vector comprises two or more insertion sites, each insertion site being located between two tracr mate sequences so as to allow insertion of a guide sequence at each site.
  • the two or more guide sequences may comprise two or more copies of a single guide sequence, two or more different guide sequences, or combinations of these.
  • a single expression construct may be used to target CRISPR activity to multiple different, corresponding target sequences within a cell.
  • a single vector may comprise about or more than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, or more guide sequences. In some embodiments, about or more than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more such guide-sequence-containing vectors may be provided, and optionally delivered to a cell.
  • a vector comprises a regulatory element operably linked to an enzyme-coding sequence encoding a CRISPR enzyme, such as a Cas protein.
  • Cas proteins include Cas1, Cas1B, Cas2, Cas3, Cas4, Cas5, Cas6, Cas7, Cas8, Cas9 (also known as Csn1 and Csx12), Cas10, Csy1, Csy2, Csy3, Cse1, Cse2, Csc1, Csc2, Csa5, Csn2, Csm2, Csm3, Csm4, Csm5, Csm6, Cmr1, Cmr3, Cmr4, Cmr5, Cmr6, Csb1, Csb2, Csb3, Csx17, Csx14, Csx10, Csx16, CsaX, Csx3, Csx1, Csx15, Csf1, Csf2, Csf3, Csf4, homologs thereof, or modified versions thereof.
  • the amino acid sequence of S. pyogenes Cas9 protein may be found in the SwissProt database under accession number Q99ZW2.
  • the unmodified CRISPR enzyme has DNA cleavage activity, such as Cas9.
  • the CRISPR enzyme is Cas9, and may be Cas9 from S. pyogenes or S. pneumoniae .
  • the CRISPR enzyme directs cleavage of one or both strands at the location of a target sequence, such as within the target sequence and/or within the complement of the target sequence.
  • the CRISPR enzyme directs cleavage of one or both strands within about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 50, 100, 200, 500, or more base pairs from the first or last nucleotide of a target sequence.
  • a vector encodes a CRISPR enzyme that is mutated to with respect to a corresponding wild-type enzyme such that the mutated CRISPR enzyme lacks the ability to cleave one or both strands of a target polynucleotide containing a target sequence.
  • D 10A aspartate-to-alanine substitution
  • pyogenes converts Cas9 from a nuclease that cleaves both strands to a nickase (cleaves a single strand).
  • Other examples of mutations that render Cas9 a nickase include, without limitation, H840A, N854A, and N863A.
  • a Cas9 nickase may be used in combination with guide sequenc(es), e.g., two guide sequences, which target respectively sense and antisense strands of the DNA target. This combination allows both strands to be nicked and used to induce NHEJ.
  • Applicants have demonstrated (data not shown) the efficacy of two nickase targets (i.e., sgRNAs targeted at the same location but to different strands of DNA) in inducing mutagenic NHEJ.
  • a single nickase (Cas9-D10A with a single sgRNA) is unable to induce NHEJ and create indels but Applicants have shown that double nickase (Cas9-D10A and two sgRNAs targeted to different strands at the same location) can do so in human embryonic stem cells (hESCs).
  • the efficiency is about 50% of nuclease (i.e., regular Cas9 without D10 mutation) in hESCs.
  • two or more catalytic domains of Cas9 may be mutated to produce a mutated Cas9 substantially lacking all DNA cleavage activity.
  • a D10A mutation is combined with one or more of H840A, N854A, or N863A mutations to produce a Cas9 enzyme substantially lacking all DNA cleavage activity.
  • a CRISPR enzyme is considered to substantially lack all DNA cleavage activity when the DNA cleavage activity of the mutated enzyme is less than about 25%, 10%, 5%, 1%, 0.1%, 0.01%, or lower with respect to its non-mutated form.
  • Other mutations may be useful; where the Cas9 or other CRISPR enzyme is from a species other than S. pyogenes , mutations in corresponding amino acids may be made to achieve similar effects.
  • an enzyme coding sequence encoding a CRISPR enzyme is codon optimized for expression in particular cells, such as eukaryotic cells.
  • the eukaryotic cells may be those of or derived from a particular organism, such as a mammal, including but not limited to human, mouse, rat, rabbit, dog, or non-human primate.
  • codon optimization refers to a process of modifying a nucleic acid sequence for enhanced expression in the host cells of interest by replacing at least one codon (e.g. about or more than about 1, 2, 3, 4, 5, 10, 15, 20, 25, 50, or more codons) of the native sequence with codons that are more frequently or most frequently used in the genes of that host cell while maintaining the native amino acid sequence.
  • Codon bias differs in codon usage between organisms
  • mRNA messenger RNA
  • tRNA transfer RNA
  • the predominance of selected tRNAs in a cell is generally a reflection of the codons used most frequently in peptide synthesis. Accordingly, genes can be tailored for optimal gene expression in a given organism based on codon optimization. Codon usage tables are readily available, for example, at the “Codon Usage Database”, and these tables can be adapted in a number of ways.
  • codon optimizing a particular sequence for expression in a particular host cell are also available, such as Gene Forge (Aptagen; Jacobus, Pa.), are also available.
  • one or more codons e.g. 1, 2, 3, 4, 5, 10, 15, 20, 25, 50, or more, or all codons
  • one or more codons in a sequence encoding a CRISPR enzyme correspond to the most frequently used codon for a particular amino acid.
  • a vector encodes a CRISPR enzyme comprising one or more nuclear localization sequences (NLSs), such as about or more than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more NLSs.
  • the CRISPR enzyme comprises about or more than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more NLSs at or near the amino-terminus, about or more than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more NLSs at or near the carboxy-terminus, or a combination of these (e.g. one or more NLS at the amino-terminus and one or more NLS at the carboxy terminus).
  • the CRISPR enzyme comprises at most 6 NLSs.
  • an NLS is considered near the N- or C-terminus when the nearest amino acid of the NLS is within about 1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 40, 50, or more amino acids along the polypeptide chain from the N- or C-terminus.
  • an NLS consists of one or more short sequences of positively charged lysines or arginines exposed on the protein surface, but other types of NLS are known.
  • Non-limiting examples of NLSs include an NLS sequence derived from: the NLS of the SV40 virus large T-antigen, having the amino acid sequence PKKKRKV (SEQ ID NO: 1); the NLS from nucleoplasmin (e.g.
  • the nucleoplasmin bipartite NLS with the sequence KRPAATKKAGQAKKKK (SEQ ID NO: 2)); the c-myc NLS having the amino acid sequence PAAKRVKLD (SEQ ID NO: 3) or RQRRNELKRSP (SEQ ID NO: 4); the hRNPA1 M9 NLS having the sequence NQSSNFGPMKGGNFGGRSSGPYGGGGQYFAKPRNQGGY (SEQ ID NO: 5); the sequence RMRIZFKNKGKDTAELRRRRVEVSVELRKAKKDEQILKRRNV (SEQ ID NO: 6) of the IBB domain from importin-alpha; the sequences VSRKRPRP (SEQ ID NO: 7) and PPKKARED (SEQ ID NO: 8) of the myoma T protein; the sequence PQPKKKPL (SEQ ID NO: 9) of human p53; the sequence SALIKKKKKMAP (SEQ ID NO: 10) of mouse c-abl IV; the sequences D
  • the one or more NLSs are of sufficient strength to drive accumulation of the CRISPR enzyme in a detectable amount in the nucleus of a eukaryotic cell.
  • strength of nuclear localization activity may derive from the number of NLSs in the CRISPR enzyme, the particular NLS(s) used, or a combination of these factors.
  • Detection of accumulation in the nucleus may be performed by any suitable technique.
  • a detectable marker may be fused to the CRISPR enzyme, such that location within a cell may be visualized, such as in combination with a means for detecting the location of the nucleus (e.g. a stain specific for the nucleus such as DAPI).
  • detectable markers include fluorescent proteins (such as Green fluorescent proteins, or GFP; RFP; CFP), and epitope tags (HA tag, flag tag, SNAP tag).
  • Cell nuclei may also be isolated from cells, the contents of which may then be analyzed by any suitable process for detecting protein, such as immunohistochemistry, Western blot, or enzyme activity assay. Accumulation in the nucleus may also be determined indirectly, such as by an assay for the effect of CRISPR complex formation (e.g.
  • a guide sequence is any polynucleotide sequence having sufficient complementarity with a target polynucleotide sequence to hybridize with the target sequence and direct sequence-specific binding of a CRISPR complex to the target sequence.
  • the degree of complementarity between a guide sequence and its corresponding target sequence, when optimally aligned using a suitable alignment algorithm is about or more than about 50%, 60%, 75%, 80%, 85%, 90%, 95%, 97.5%, 99%, or more.
  • Optimal alignment may be determined with the use of any suitable algorithm for aligning sequences, non-limiting example of which include the Smith-Waterman algorithm, the Needleman-Wunsch algorithm, algorithms based on the Burrows-Wheeler Transform (e.g. the Burrows Wheeler Aligner), ClustalW, Clustal X, BLAT, Novoalign (Novocraft Technologies, ELAND (Illumina, San Diego, Calif.), SOAP (available at soap.genomics.org.cn), and Maq (available at maq.sourceforge.net).
  • any suitable algorithm for aligning sequences include the Smith-Waterman algorithm, the Needleman-Wunsch algorithm, algorithms based on the Burrows-Wheeler Transform (e.g. the Burrows Wheeler Aligner), ClustalW, Clustal X, BLAT, Novoalign (Novocraft Technologies, ELAND (Illumina, San Diego, Calif.), SOAP (available at soap.genomics.org.cn), and
  • a guide sequence is about or more than about 5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 35, 40, 45, 50, 75, or more nucleotides in length. In some embodiments, a guide sequence is less than about 75, 50, 45, 40, 35, 30, 25, 20, 15, 12, or fewer nucleotides in length. The ability of a guide sequence to direct sequence-specific binding of a CRISPR complex to a target sequence may be assessed by any suitable assay.
  • the components of a CRISPR system sufficient to form a CRISPR complex may be provided to a host cell having the corresponding target sequence, such as by transfection with vectors encoding the components of the CRISPR sequence, followed by an assessment of preferential cleavage within the target sequence, such as by Surveyor assay as described herein.
  • cleavage of a target polynucleotide sequence may be evaluated in a test tube by providing the target sequence, components of a CRISPR complex, including the guide sequence to be tested and a control guide sequence different from the test guide sequence, and comparing binding or rate of cleavage at the target sequence between the test and control guide sequence reactions.
  • Other assays are possible, and will occur to those skilled in the art.
  • a guide sequence may be selected to target any target sequence.
  • the target sequence is a sequence within a genome of a cell.
  • Exemplary target sequences include those that are unique in the target genome.
  • a unique target sequence in a genome may include a Cas9 target site of the form MMMMMMMMNNNNNNNNNNXGG where NNNNNNNNNXGG (N is A, G, T, or C; and X can be anything) has a single occurrence in the genome.
  • a unique target sequence in a genome may include an S.
  • a unique target sequence in a genome may include a Cas9 target site of the form MMMMMMMNNNNNNNXXAGAAW (SEQ ID NO: 17) where NNNNNNNNXXAGAAW (SEQ ID NO: 18) (N is A, G, T, or C; X can be anything; and W is A or T) has a single occurrence in the genome.
  • a unique target sequence in a genome may include an S.
  • a unique target sequence in a genome may include a Cas9 target site of the form MMMMMMMNNNNNNNNNNNNNXGGXG where NNNNNNNNNXGGXG (N is A, G, T, or C; and X can be anything) has a single occurrence in the genome.
  • a unique target sequence in a genome may include an S. pyogenes Cas9 target site of the form MMMMMMMMNNNNNNNNNNNNXGGXG where NNNNNNNNXGGXG (N is A, G, T, or C; and X can be anything) has a single occurrence in the genome.
  • NNNNNNNNXGGXG N is A, G, T, or C; and X can be anything
  • M may be A, G, T, or C, and need not be considered in identifying a sequence as unique.
  • a guide sequence is selected to reduce the degree of secondary structure within the guide sequence.
  • Secondary structure may be determined by any suitable polynucleotide folding algorithm. Some programs are based on calculating the minimal Gibbs free energy. An example of one such algorithm is mFold, as described by Zuker and Stiegler (Nucleic Acids Res. 9 (1981), 133-148). Another example folding algorithm is the online webserver RNAfold, developed at Institute for Theoretical Chemistry at the University of Vienna, using the centroid structure prediction algorithm (see e.g. A. R. Gruber et al., 2008, Cell 106(1): 23-24; and PA Can and GM Church, 2009 , Nature Biotechnology 27(12): 1151-62). Further algorithms may be found in U.S. application Ser. No. TBA (attorney docket 44790.11.2022; Broad Reference BI-2013/004A); incorporated herein by reference.
  • a tracr mate sequence includes any sequence that has sufficient complementarity with a tracr sequence to promote one or more of: (1) excision of a guide sequence flanked by tracr mate sequences in a cell containing the corresponding tracr sequence; and (2) formation of a CRISPR complex at a target sequence, wherein the CRISPR complex comprises the tracr mate sequence hybridized to the tracr sequence.
  • degree of complementarity is with reference to the optimal alignment of the tracr mate sequence and tracr sequence, along the length of the shorter of the two sequences.
  • Optimal alignment may be determined by any suitable alignment algorithm, and may further account for secondary structures, such as self-complementarity within either the tracr sequence or tracr mate sequence.
  • the degree of complementarity between the tracr sequence and tracr mate sequence along the length of the shorter of the two when optimally aligned is about or more than about 25%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 97.5%, 99%, or higher.
  • Example illustrations of optimal alignment between a tracr sequence and a tracr mate sequence are provided in FIGS. 12B and 13B .
  • the tracr sequence is about or more than about 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 30, 40, 50, or more nucleotides in length.
  • the tracr sequence and tracr mate sequence are contained within a single transcript, such that hybridization between the two produces a transcript having a secondary structure, such as a hairpin.
  • Preferred loop forming sequences for use in hairpin structures are four nucleotides in length, and most preferably have the sequence GAAA. However, longer or shorter loop sequences may be used, as may alternative sequences.
  • the sequences preferably include a nucleotide triplet (for example, AAA), and an additional nucleotide (for example C or G). Examples of loop forming sequences include CAAA and AAAG.
  • the transcript or transcribed polynucleotide sequence has at least two or more hairpins.
  • the transcript has two, three, four or five hairpins. In a further embodiment of the invention, the transcript has at most five hairpins.
  • the single transcript further includes a transcription termination sequence; preferably this is a polyT sequence, for example six T nucleotides. An example illustration of such a hairpin structure is provided in the lower portion of FIG. 13B , where the portion of the sequence 5′ of the final “N” and upstream of the loop corresponds to the tracr mate sequence, and the portion of the sequence 3′ of the loop corresponds to the tracr sequence.
  • N represents a base of a guide sequence
  • the first block of lower case letters represent the tracr mate sequence
  • the second block of lower case letters represent the tracr sequence
  • the final poly-T sequence represents the transcription terminator: (1) NNNNNNNNNNNNNNNNNNNNNgtttttgtactctcaagatttaGAAAtaaatcttgcagaagctacaagataaggctt catgccgaaatcaacaccctgtcattttatggcagggtgttttcgttttaaTTTTTTTTTT (SEQ ID NO: 21); (2) NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNgt
  • sequences (1) to (3) are used in combination with Cas9 from S. thermophilus CRISPR1.
  • sequences (4) to (6) are used in combination with Cas9 from S. pyogenes .
  • the tracr sequence is a separate transcript from a transcript comprising the tracr mate sequence (such as illustrated in the top portion of FIG. 13B ).
  • a recombination template is also provided.
  • a recombination template may be a component of another vector as described herein, contained in a separate vector, or provided as a separate polynucleotide.
  • a recombination template is designed to serve as a template in homologous recombination, such as within or near a target sequence nicked or cleaved by a CRISPR enzyme as a part of a CRISPR complex.
  • a template polynucleotide may be of any suitable length, such as about or more than about 10, 15, 20, 25, 50, 75, 100, 150, 200, 500, 1000, or more nucleotides in length.
  • the template polynucleotide is complementary to a portion of a polynucleotide comprising the target sequence.
  • a template polynucleotide might overlap with one or more nucleotides of a target sequences (e.g. about or more than about 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100 or more nucleotides).
  • the nearest nucleotide of the template polynucleotide is within about 1, 5, 10, 15, 20, 25, 50, 75, 100, 200, 300, 400, 500, 1000, 5000, 10000, or more nucleotides from the target sequence.
  • the CRISPR enzyme is part of a fusion protein comprising one or more heterologous protein domains (e.g. about or more than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more domains in addition to the CRISPR enzyme).
  • a CRISPR enzyme fusion protein may comprise any additional protein sequence, and optionally a linker sequence between any two domains.
  • protein domains that may be fused to a CRISPR enzyme include, without limitation, epitope tags, reporter gene sequences, and protein domains having one or more of the following activities: methylase activity, demethylase activity, transcription activation activity, transcription repression activity, transcription release factor activity, histone modification activity, RNA cleavage activity and nucleic acid binding activity.
  • epitope tags include histidine (His) tags, V5 tags, FLAG tags, influenza hemagglutinin (HA) tags, Myc tags, VSV-G tags, and thioredoxin (Trx) tags.
  • reporter genes include, but are not limited to, glutathione-S-transferase (GST), horseradish peroxidase (HRP), chloramphenicol acetyltransferase (CAT) beta-galactosidase, beta-glucuronidase, luciferase, green fluorescent protein (GFP), HcRed, DsRed, cyan fluorescent protein (CFP), yellow fluorescent protein (YFP), and autofluorescent proteins including blue fluorescent protein (BFP).
  • GST glutathione-S-transferase
  • HRP horseradish peroxidase
  • CAT chloramphenicol acetyltransferase
  • beta-galactosidase beta-galactosidase
  • beta-glucuronidase beta-galactosidase
  • luciferase green fluorescent protein
  • GFP green fluorescent protein
  • HcRed HcRed
  • DsRed cyan fluorescent protein
  • a CRISPR enzyme may be fused to a gene sequence encoding a protein or a fragment of a protein that bind DNA molecules or bind other cellular molecules, including but not limited to maltose binding protein (MBP), S-tag, Lex A DNA binding domain (DBD) fusions, GAL4 DNA binding domain fusions, and herpes simplex virus (HSV) BP16 protein fusions. Additional domains that may form part of a fusion protein comprising a CRISPR enzyme are described in US20110059502, incorporated herein by reference. In some embodiments, a tagged CRISPR enzyme is used to identify the location of a target sequence.
  • MBP maltose binding protein
  • DBD Lex A DNA binding domain
  • HSV herpes simplex virus
  • the invention provides methods comprising delivering one or more polynucleotides, such as or one or more vectors as described herein, one or more transcripts thereof, and/or one or proteins transcribed therefrom, to a host cell.
  • the invention further provides cells produced by such methods, and organisms (such as animals, plants, or fungi) comprising or produced from such cells.
  • a CRISPR enzyme in combination with (and optionally complexed with) a guide sequence is delivered to a cell.
  • Conventional viral and non-viral based gene transfer methods can be used to introduce nucleic acids in mammalian cells or target tissues.
  • Non-viral vector delivery systems include DNA plasmids, RNA (e.g. a transcript of a vector described herein), naked nucleic acid, and nucleic acid complexed with a delivery vehicle, such as a liposome.
  • Viral vector delivery systems include DNA and RNA viruses, which have either episomal or integrated genomes after delivery to the cell.
  • Methods of non-viral delivery of nucleic acids include lipofection, nucleofection, microinjection, biolistics, virosomes, liposomes, immunoliposomes, polycation or lipid:nucleic acid conjugates, naked DNA, artificial virions, and agent-enhanced uptake of DNA.
  • Lipofection is described in e.g., U.S. Pat. Nos. 5,049,386, 4,946,787; and 4,897,355) and lipofection reagents are sold commercially (e.g., TransfectamTM and LipofectinTM).
  • Cationic and neutral lipids that are suitable for efficient receptor-recognition lipofection of polynucleotides include those of Feigner, WO 91/17424; WO 91/16024. Delivery can be to cells (e.g. in vitro or ex vivo administration) or target tissues (e.g. in vivo administration).
  • lipid:nucleic acid complexes including targeted liposomes such as immunolipid complexes
  • the preparation of lipid:nucleic acid complexes, including targeted liposomes such as immunolipid complexes is well known to one of skill in the art (see, e.g., Crystal, Science 270:404-410 (1995); Blaese et al., Cancer Gene Ther. 2:291-297 (1995); Behr et al., Bioconjugate Chem. 5:382-389 (1994); Remy et al., Bioconjugate Chem. 5:647-654 (1994); Gao et al., Gene Therapy 2:710-722 (1995); Ahmad et al., Cancer Res. 52:4817-4820 (1992); U.S. Pat. Nos. 4,186,183, 4,217,344, 4,235,871, 4,261,975, 4,485,054, 4,501,728, 4,774,085, 4,837,028, and 4,946,787).
  • RNA or DNA viral based systems for the delivery of nucleic acids takes advantage of highly evolved processes for targeting a virus to specific cells in the body and trafficking the viral payload to the nucleus.
  • Viral vectors can be administered directly to patients (in vivo) or they can be used to treat cells in vitro, and the modified cells may optionally be administered to patients (ex vivo).
  • Conventional viral based systems could include retroviral, lentivirus, adenoviral, adeno-associated and herpes simplex virus vectors for gene transfer. Integration in the host genome is possible with the retrovirus, lentivirus, and adeno-associated virus gene transfer methods, often resulting in long term expression of the inserted transgene. Additionally, high transduction efficiencies have been observed in many different cell types and target tissues.
  • Lentiviral vectors are retroviral vectors that are able to transduce or infect non-dividing cells and typically produce high viral titers. Selection of a retroviral gene transfer system would therefore depend on the target tissue. Retroviral vectors are comprised of cis-acting long terminal repeats with packaging capacity for up to 6-10 kb of foreign sequence. The minimum cis-acting LTRs are sufficient for replication and packaging of the vectors, which are then used to integrate the therapeutic gene into the target cell to provide permanent transgene expression.
  • Widely used retroviral vectors include those based upon murine leukemia virus (MuLV), gibbon ape leukemia virus (GaLV), Simian Immuno deficiency virus (SIV), human immuno deficiency virus (HIV), and combinations thereof (see, e.g., Buchscher et al., J. Virol. 66:2731-2739 (1992); Johann et al., J. Virol. 66:1635-1640 (1992); Sommnerfelt et al., Virol. 176:58-59 (1990); Wilson et al., J. Virol. 63:2374-2378 (1989); Miller et al., J. Virol.
  • MiLV murine leukemia virus
  • GaLV gibbon ape leukemia virus
  • SIV Simian Immuno deficiency virus
  • HAV human immuno deficiency virus
  • adenoviral based systems may be used.
  • Adenoviral based vectors are capable of very high transduction efficiency in many cell types and do not require cell division. With such vectors, high titer and levels of expression have been obtained. This vector can be produced in large quantities in a relatively simple system.
  • Adeno-associated virus (“AAV”) vectors may also be used to transduce cells with target nucleic acids, e.g., in the in vitro production of nucleic acids and peptides, and for in vivo and ex vivo gene therapy procedures (see, e.g., West et al., Virology 160:38-47 (1987); U.S. Pat. No. 4,797,368; WO 93/24641; Kotin, Human Gene Therapy 5:793-801 (1994); Muzyczka, J. Clin. Invest. 94:1351 (1994). Construction of recombinant AAV vectors are described in a number of publications, including U.S. Pat. No.
  • Packaging cells are typically used to form virus particles that are capable of infecting a host cell. Such cells include 293 cells, which package adenovirus, and ⁇ 2 cells or PA317 cells, which package retrovirus.
  • Viral vectors used in gene therapy are usually generated by producing a cell line that packages a nucleic acid vector into a viral particle. The vectors typically contain the minimal viral sequences required for packaging and subsequent integration into a host, other viral sequences being replaced by an expression cassette for the polynucleotide(s) to be expressed. The missing viral functions are typically supplied in trans by the packaging cell line. For example, AAV vectors used in gene therapy typically only possess ITR sequences from the AAV genome which are required for packaging and integration into the host genome.
  • Viral DNA is packaged in a cell line, which contains a helper plasmid encoding the other AAV genes, namely rep and cap, but lacking ITR sequences.
  • the cell line may also be infected with adenovirus as a helper.
  • the helper virus promotes replication of the AAV vector and expression of AAV genes from the helper plasmid.
  • the helper plasmid is not packaged in significant amounts due to a lack of ITR sequences. Contamination with adenovirus can be reduced by, e.g., heat treatment to which adenovirus is more sensitive than AAV. Additional methods for the delivery of nucleic acids to cells are known to those skilled in the art. See, for example, US20030087817, incorporated herein by reference.
  • a host cell is transiently or non-transiently transfected with one or more vectors described herein.
  • a cell is transfected as it naturally occurs in a subject.
  • a cell that is transfected is taken from a subject.
  • the cell is derived from cells taken from a subject, such as a cell line. A wide variety of cell lines for tissue culture are known in the art.
  • cell lines include, but are not limited to, C8161, CCRF-CEM, MOLT, mIMCD-3, NHDF, HeLa-S3, Huh1, Huh4, Huh7, HUVEC, HASMC, HEKn, HEKa, MiaPaCell, Pane1, PC-3, TF1, CTLL-2, C1R, Rat6, CV1, RPTE, A10, T24, J82, A375, ARH-77, Calu1, SW480, SW620, SKOV3, SK-UT, CaCo2, P388D1, SEM-K2, WEHI-231, HB56, TIB55, Jurkat, J45.01, LRMB, Bcl-1, BC-3, IC21, DLD2, Raw264.7, NRK, NRK-52E, MRCS, MEF, Hep G2, HeLa B, HeLa T4, COS, COS-1, COS-6, COS-M6A, BS-C-1 monkey kidney epithelial, BA
  • a cell transfected with one or more vectors described herein is used to establish a new cell line comprising one or more vector-derived sequences.
  • a cell transiently transfected with the components of a CRISPR system as described herein (such as by transient transfection of one or more vectors, or transfection with RNA), and modified through the activity of a CRISPR complex, is used to establish a new cell line comprising cells containing the modification but lacking any other exogenous sequence.
  • cells transiently or non-transiently transfected with one or more vectors described herein, or cell lines derived from such cells are used in assessing one or more test compounds.
  • one or more vectors described herein are used to produce a non-human transgenic animal or transgenic plant.
  • the transgenic animal is a mammal, such as a mouse, rat, or rabbit.
  • the organism or subject is a plant.
  • the organism or subject or plant is algae. Methods for producing transgenic plants and animals are known in the art, and generally begin with a method of cell transfection, such as described herein.
  • the invention provides for methods of modifying a target polynucleotide in a eukaryotic cell.
  • the method comprises allowing a CRISPR complex to bind to the target polynucleotide to effect cleavage of said target polynucleotide thereby modifying the target polynucleotide, wherein the CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence hybridized to a target sequence within said target polynucleotide, wherein said guide sequence is linked to a tracr mate sequence which in turn hybridizes to a tracr sequence.
  • the invention provides a method of modifying expression of a polynucleotide in a eukaryotic cell.
  • the method comprises allowing a CRISPR complex to bind to the polynucleotide such that said binding results in increased or decreased expression of said polynucleotide; wherein the CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence hybridized to a target sequence within said polynucleotide, wherein said guide sequence is linked to a tracr mate sequence which in turn hybridizes to a tracr sequence.
  • the invention provides for methods of modifying a target polynucleotide in a eukaryotic cell, which may be in vivo, ex vivo or in vitro.
  • the method comprises sampling a cell or population of cells from a human or non-human animal or plant (including micro-algae), and modifying the cell or cells. Culturing may occur at any stage ex vivo. The cell or cells may even be re-introduced into the non-human animal or plant (including micro-algae).
  • pathogens are often host-specific.
  • Fusarium oxysporum f. sp. lycopersici causes tomato wilt but attacks only tomato
  • Plants have existing and induced defenses to resist most pathogens. Mutations and recombination events across plant generations lead to genetic variability that gives rise to susceptibility, especially as pathogens reproduce with more frequency than plants. In plants there can be non-host resistance, e.g., the host and pathogen are incompatible.
  • Horizontal Resistance e.g., partial resistance against all races of a pathogen, typically controlled by many genes
  • Vertical Resistance e.g., complete resistance to some races of a pathogen but not to other races, typically controlled by a few genes.
  • Plant and pathogens evolve together, and the genetic changes in one balance changes in other. Accordingly, using Natural Variability, breeders combine most useful genes for Yield, Quality, Uniformity, Hardiness, Resistance.
  • the sources of resistance genes include native or foreign Varieties, Heirloom Varieties, Wild Plant Relatives, and Induced Mutations, e.g., treating plant material with mutagenic agents.
  • plant breeders are provided with a new tool to induce mutations. Accordingly, one skilled in the art can analyze the genome of sources of resistance genes, and in Varieties having desired characteristics or traits employ the present invention to induce the rise of resistance genes, with more precision than previous mutagenic agents and hence accelerate and improve plant breeding programs.
  • the invention provides kits containing any one or more of the elements disclosed in the above methods and compositions.
  • the kit comprises a vector system and instructions for using the kit.
  • the vector system comprises (a) a first regulatory element operably linked to a tracr mate sequence and one or more insertion sites for inserting a guide sequence upstream of the tracr mate sequence, wherein when expressed, the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell, wherein the CRISPR complex comprises a CRISPR enzyme complexed with (1) the guide sequence that is hybridized to the target sequence, and (2) the tracr mate sequence that is hybridized to the tracr sequence; and/or (b) a second regulatory element operably linked to an enzyme-coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence.
  • Elements may be provide individually or in combinations, and may be provided in any suitable container, such as a vial, a bottle, or
  • a kit comprises one or more reagents for use in a process utilizing one or more of the elements described herein.
  • Reagents may be provided in any suitable container.
  • a kit may provide one or more reaction or storage buffers.
  • Reagents may be provided in a form that is usable in a particular assay, or in a form that requires addition of one or more other components before use (e.g. in concentrate or lyophilized form).
  • a buffer can be any buffer, including but not limited to a sodium carbonate buffer, a sodium bicarbonate buffer, a borate buffer, a Tris buffer, a MOPS buffer, a HEPES buffer, and combinations thereof.
  • the buffer is alkaline.
  • the buffer has a pH from about 7 to about 10.
  • the kit comprises one or more oligonucleotides corresponding to a guide sequence for insertion into a vector so as to operably link the guide sequence and a regulatory element.
  • the kit comprises a homologous recombination template polynucleotide.
  • the invention provides methods for using one or more elements of a CRISPR system.
  • the CRISPR complex of the invention provides an effective means for modifying a target polynucleotide.
  • the CRISPR complex of the invention has a wide variety of utility including modifying (e.g., deleting, inserting, translocating, inactivating, activating) a target polynucleotide in a multiplicity of cell types.
  • the CRISPR complex of the invention has a broad spectrum of applications in, e.g., gene therapy, drug screening, disease diagnosis, and prognosis.
  • An exemplary CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence hybridized to a target sequence within the target polynucleotide.
  • the guide sequence is linked to a tracr mate sequence, which in turn hybridizes to a tracr sequence.
  • the target polynucleotide of a CRISPR complex can be any polynucleotide endogenous or exogenous to the eukaryotic cell.
  • the target polynucleotide can be a polynucleotide residing in the nucleus of the eukaryotic cell.
  • the target polynucleotide can be a sequence coding a gene product (e.g., a protein) or a non-coding sequence (e.g., a regulatory polynucleotide or a junk DNA).
  • a gene product e.g., a protein
  • a non-coding sequence e.g., a regulatory polynucleotide or a junk DNA.
  • PAM protospacer adjacent motif
  • PAMs are typically 2-5 base pair sequences adjacent the protospacer (that is, the target sequence) Examples of PAM sequences are given in the examples section below, and the skilled person will be able to identify further PAM sequences for use with a given CRISPR enzyme.
  • the target polynucleotide of a CRISPR complex may include a number of disease-associated genes and polynucleotides as well as signaling biochemical pathway-associated genes and polynucleotides as listed in U.S. provisional patent application 61/736,527 and 61/748,427 having Broad reference BI-2011/008/WSGR Docket No. 44063-701.101 and BI-2011/008/WSGR Docket No. 44063-701.102 respectively, both entitled SYSTEMS METHODS AND COMPOSITIONS FOR SEQUENCE MANIPULATION filed on Dec. 12, 2012 and Jan. 2, 2013, respectively, the contents of all of which are herein incorporated by reference in their entirety.
  • target polynucleotides include a sequence associated with a signaling biochemical pathway, e.g., a signaling biochemical pathway-associated gene or polynucleotide.
  • target polynucleotides include a disease associated gene or polynucleotide.
  • a “disease-associated” gene or polynucleotide refers to any gene or polynucleotide which is yielding transcription or translation products at an abnormal level or in an abnormal form in cells derived from a disease-affected tissues compared with tissues or cells of a non disease control.
  • a disease-associated gene also refers to a gene possessing mutation(s) or genetic variation that is directly responsible or is in linkage disequilibrium with a gene(s) that is responsible for the etiology of a disease.
  • the transcribed or translated products may be known or unknown, and may be at a normal or abnormal level.
  • disease-associated genes and polynucleotides are available from McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University (Baltimore, Md.) and National Center for Biotechnology Information, National Library of Medicine (Bethesda, Md.), available on the World Wide Web.
  • Examples of disease-associated genes and polynucleotides are listed in Tables A and B. Disease specific information is available from McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University (Baltimore, Md.) and National Center for Biotechnology Information, National Library of Medicine (Bethesda, Md.), available on the World Wide Web. Examples of signaling biochemical pathway-associated genes and polynucleotides are listed in Table C.
  • genes, diseases and proteins can result in production of improper proteins or proteins in improper amounts which affect function.
  • genes, diseases and proteins are hereby incorporated by reference from U.S. Provisional application 61/736,527 filed on Dec. 12, 2012 and 61/748,427 filed on Feb. 2, 2013.
  • Such genes, proteins and pathways may be the target polynucleotide of a CRISPR complex.
  • Neoplasia PTEN ATM; ATR; EGFR; ERBB2; ERBB3; ERBB4; Notch1; Notch2; Notch3; Notch4; AKT; AKT2; AKT3; HIF; HIF1a; HIF3a; Met; HRG; Bcl2; PPAR alpha; PPAR gamma; WT1 (Wilms Tumor); FGF Receptor Family members (5 members: 1, 2, 3, 4, 5); CDKN2a; APC; RB (retinoblastoma); MEN1; VHL; BRCA1; BRCA2; AR (Androgen Receptor); TSG101; IGF; IGF Receptor; Igf1 (4 variants); Igf2 (3 variants); Igf 1 Receptor; Igf 2 Receptor; Bax; Bcl2; caspases family (9 members: 1, 2, 3, 4, 6, 7, 8, 9, 12); Kras;
  • BCL7A BCL7
  • Leukemia TAL1, and oncology TCL5, SCL, TAL2, FLT3, NBS1, NBS, ZNFN1A1, IK1, LYF1, diseases and disorders HOXD4, HOX4B, BCR, CML, PHL, ALL, ARNT, KRAS2, RASK2, GMPS, AF10, ARHGEF12, LARG, KIAA0382, CALM, CLTH, CEBPA, CEBP, CHIC2, BTL, FLT3, KIT, PBT, LPP, NPM1, NUP214, D9S46E, CAN, CAIN, RUNX1, CBFA2, AML1, WHSC1L1, NSD3, FLT3, AF1Q, NPM1, NUMA1, ZNF145, PLZF, PML, MYL, STAT5B, AF10, CALM, CLTH, ARL11, ARLTS1, P2RX7,
  • Inflammation and AIDS Keratinization and AIDS (KIR3DL1, NKAT3, NKB1, AMB11, KIR3DS1, IFNG, CXCL12, immune related SDF1); Autoimmune lymphoproliferative syndrome (TNFRSF6, APT1, diseases and disorders FAS, CD95, ALPS1A); Combined immunodeficiency, (IL2RG, SCIDX1, SCIDX, IMD4); HIV-1 (CCL5, SCYA5, D17S136E, TCP228), HIV susceptibility or infection (IL10, CSIF, CMKBR2, CCR2, CMKBR5, CCCKR5 (CCR5)); Immunodeficiencies (CD3E, CD3G, AICDA, AID, HIGM2, TNFRSF5, CD40, UNG, DGU, HIGM4, TNFSF5, CD40LG, HIGM1, IGM, FOXP3, IPEX, AIID, XPID, PIDX, TNFRSF14B, TACI
  • Muscular/Skeletal Becker muscular dystrophy (DMD, BMD, MYF6), Duchenne Muscular diseases and disorders Dystrophy (DMD, BMD); Emery-Dreifuss muscular dystrophy (LMNA, LMN1, EMD2, FPLD, CMD1A, HGPS, LGMD1B, LMNA, LMN1, EMD2, FPLD, CMD1A); Facioscapulohumeral muscular dystrophy (FSHMD1A, FSHD1A); Muscular dystrophy (FKRP, MDC1C, LGMD2I, LAMA2, LAMM, LARGE, KIAA0609, MDC1D, FCMD, TTID, MYOT, CAPN3, CANP3, DYSF, LGMD2B, SGCG, LGMD2C, DMDA1, SCG3, SGCA, ADL, DAG2, LGMD2D, DMDA2, SGCB, LGMD2E, SGCD, SGD, LGMD2F, C
  • Neurological and ALS SOD1, ALS2, STEX, FUS, TARDBP, VEGF (VEGF-a, VEGF-b, neuronal diseases and VEGF-c); Alzheimer disease (APP, AAA, CVAP, AD1, APOE, AD2, disorders PSEN2, AD4, STM2, APBB2, FE65L1, NOS3, PLAU, URK, ACE, DCP1, ACE1, MPO, PACIP1, PAXIP1L, PTIP, A2M, BLMH, BMH, PSEN1, AD3); Autism (Mecp2, BZRAP1, MDGA2, Sema5A, Neurexin1, GLO1, MECP2, RTT, PPMX, MRX16, MRX79, NLGN3, NLGN4, KIAA1260, AUTSX2); Fragile X Syndrome (FMR2, FXR1, FXR2, mGLUR5); Huntington's disease and disease like disorders (HD, IT15, PRNP, PRIP, JPH3,
  • Occular diseases and Age-related macular degeneration (Abcr, Ccl2, Cc2, cp (ceruloplasmin), disorders Timp3, cathepsinD, Vldlr, Ccr2); Cataract (CRYAA, CRYA1, CRYBB2, CRYB2, PITX3, BFSP2, CP49, CP47, CRYAA, CRYA1, PAX6, AN2, MGDA, CRYBA1, CRYB1, CRYGC, CRYG3, CCL, LIM2, MP19, CRYGD, CRYG4, BFSP2, CP49, CP47, HSF4, CTM, HSF4, CTM, MIP, AQP0, CRYAB, CRYA2, CTPP2, CRYBB1, CRYGD, CRYG4, CRYBB2, CRYB2, CRYGC, CRYG3, CCL, CRYAA, CRYA1, GJA8, CX50, CAE1, GJA3, CX46, CZP3, CAE3, CCM1, CAM
  • Embodiments of the invention also relate to methods and compositions related to knocking out genes, amplifying genes and repairing particular mutations associated with DNA repeat instability and neurological disorders (Robert D. Wells, Tetsuo Ashizawa, Genetic Instabilities and Neurological Diseases, Second Edition, Academic Press, Oct. 13, 2011—Medical). Specific aspects of tandem repeat sequences have been found to be responsible for more than twenty human diseases (New insights into repeat instability: role of RNA•DNA hybrids. McIvor E I, Polak U, Napierala M. RNA Biol. 2010 September-October; 7(5):551-8). The CRISPR-Cas system may be harnessed to correct these defects of genomic instability.
  • a further aspect of the invention relates to utilizing the CRISPR-Cas system for correcting defects in the EMP2A and EMP2B genes that have been identified to be associated with Lafora disease.
  • Lafora disease is an autosomal recessive condition which is characterized by progressive myoclonus epilepsy which may start as epileptic seizures in adolescence.
  • a few cases of the disease may be caused by mutations in genes yet to be identified.
  • the disease causes seizures, muscle spasms, difficulty walking, dementia, and eventually death. There is currently no therapy that has proven effective against disease progression.
  • the CRISPR-Cas system may be used to correct ocular defects that arise from several genetic mutations further described in Genetic Diseases of the Eye, Second Edition, edited by Elias I. Traboulsi, Oxford University Press, 2012.
  • the genetic brain diseases may include but are not limited to Adrenoleukodystrophy, Agenesis of the Corpus Callosum, Aicardi Syndrome, Alpers' Disease, Alzheimer's Disease, Barth Syndrome, Batten Disease, CADASIL, Cerebellar Degeneration, Fabry's Disease, Gerstmann-Straussler-Scheinker Disease, Huntington's Disease and other Triplet Repeat Disorders, Leigh's Disease, Lesch-Nyhan Syndrome, Menkes Disease, Mitochondrial Myopathies and NINDS Colpocephaly. These diseases are further described on the website of the National Institutes of Health under the subsection Genetic Brain Disorders.
  • the condition may be neoplasia. In some embodiments, where the condition is neoplasia, the genes to be targeted are any of those listed in Table A (in this case PTEN and so forth). In some embodiments, the condition may be Age-related Macular Degeneration. In some embodiments, the condition may be a Schizophrenic Disorder. In some embodiments, the condition may be a Trinucleotide Repeat Disorder. In some embodiments, the condition may be Fragile X Syndrome. In some embodiments, the condition may be a Secretase Related Disorder. In some embodiments, the condition may be a Prion—related disorder. In some embodiments, the condition may be ALS. In some embodiments, the condition may be a drug addiction. In some embodiments, the condition may be Autism. In some embodiments, the condition may be Alzheimer's Disease. In some embodiments, the condition may be inflammation. In some embodiments, the condition may be Parkinson's Disease.
  • proteins associated with Parkinson's disease include but are not limited to ⁇ -synuclein, DJ-1, LRRK2, PINK1, Parkin, UCHL1, Synphilin-1, and NURR1.
  • addiction-related proteins may include ABAT for example.
  • inflammation-related proteins may include the monocyte chemoattractant protein-1 (MCP1) encoded by the Ccr2 gene, the C—C chemokine receptor type 5 (CCR5) encoded by the Ccr5 gene, the IgG receptor IIB (FCGR2b, also termed CD32) encoded by the Fcgr2b gene, or the Fc epsilon R1 g (FCER1g) protein encoded by the Fcer1g gene, for example.
  • MCP1 monocyte chemoattractant protein-1
  • CCR5 C—C chemokine receptor type 5
  • FCGR2b also termed CD32
  • FCER1g Fc epsilon R1 g
  • cardiovascular diseases associated proteins may include IL1B (interleukin 1, beta), XDH (xanthine dehydrogenase), TP53 (tumor protein p53), PTGIS (prostaglandin I2 (prostacyclin) synthase), MB (myoglobin), IL4 (interleukin 4), ANGPT1 (angiopoietin 1), ABCG8 (ATP-binding cassette, sub-family G (WHITE), member 8), or CTSK (cathepsin K), for example.
  • IL1B interleukin 1, beta
  • XDH xanthine dehydrogenase
  • TP53 tumor protein p53
  • PTGIS prostaglandin I2 (prostacyclin) synthase)
  • MB myoglobin
  • IL4 interleukin 4
  • ANGPT1 angiopoietin 1
  • ABCG8 ATP-binding cassette, sub-family G (WHITE), member 8
  • Examples of Alzheimer's disease associated proteins may include the very low density lipoprotein receptor protein (VLDLR) encoded by the VLDLR gene, the ubiquitin-like modifier activating enzyme 1 (UBA1) encoded by the UBA1 gene, or the NEDD8-activating enzyme E1 catalytic subunit protein (UBE1C) encoded by the UBA3 gene, for example.
  • VLDLR very low density lipoprotein receptor protein
  • UBA1 ubiquitin-like modifier activating enzyme 1
  • UBE1C NEDD8-activating enzyme E1 catalytic subunit protein
  • proteins associated Autism Spectrum Disorder may include the benzodiazapine receptor (peripheral) associated protein 1 (BZRAP 1) encoded by the BZRAP 1 gene, the AF4/FMR2 family member 2 protein (AFF2) encoded by the AFF2 gene (also termed MFR2), the fragile X mental retardation autosomal homolog 1 protein (FXR1) encoded by the FXR1 gene, or the fragile X mental retardation autosomal homolog 2 protein (FXR2) encoded by the FXR2 gene, for example.
  • BZRAP 1 benzodiazapine receptor (peripheral) associated protein 1
  • AFF2 AF4/FMR2 family member 2 protein
  • FXR1 fragile X mental retardation autosomal homolog 1 protein
  • FXR2 fragile X mental retardation autosomal homolog 2 protein
  • proteins associated Macular Degeneration may include the ATP-binding cassette, sub-family A (ABC1) member 4 protein (ABCA4) encoded by the ABCR gene, the apolipoprotein E protein (APOE) encoded by the APOE gene, or the chemokine (C—C motif) L1gand 2 protein (CCL2) encoded by the CCL2 gene, for example.
  • ABC1 sub-family A
  • APOE apolipoprotein E protein
  • CCL2 chemokine L1gand 2 protein
  • proteins associated Schizophrenia may include NRG1, ErbB4, CPLX1, TPH1, TPH2, NRXN1, GSK3A, BDNF, DISC1, GSK3B, and combinations thereof.
  • proteins involved in tumor suppression may include ATM (ataxia telangiectasia mutated), ATR (ataxia telangiectasia and Rad3 related), EGFR (epidermal growth factor receptor), ERBB2 (v-erb-b2 erythroblastic leukemia viral oncogene homolog 2), ERBB3 (v-erb-b2 erythroblastic leukemia viral oncogene homolog 3), ERBB4 (v-erb-b2 erythroblastic leukemia viral oncogene homolog 4), Notch 1, Notch2, Notch 3, or Notch 4, for example.
  • ATM ataxia telangiectasia mutated
  • ATR ataxia telangiectasia and Rad3 related
  • EGFR epidermatitise
  • ERBB2 v-erb-b2 erythroblastic leukemia viral oncogene homolog 2
  • ERBB3 v-erb-b2 erythroblastic leukemia viral on
  • proteins associated with a secretase disorder may include PSENEN (presenilin enhancer 2 homolog ( C. elegans )), CTSB (cathepsin B), PSEN1 (presenilin 1), APP (amyloid beta (A4) precursor protein), APH1B (anterior pharynx defective 1 homolog B ( C. elegans )), PSEN2 (presenilin 2 (Alzheimer disease 4)), or BACE1 (beta-site APP-cleaving enzyme 1), for example.
  • proteins associated with Amyotrophic Lateral Sclerosis may include SOD1 (superoxide dismutase 1), ALS2 (amyotrophic lateral sclerosis 2), FUS (fused in sarcoma), TARDBP (TAR DNA binding protein), VAGFA (vascular endothelial growth factor A), VAGFB (vascular endothelial growth factor B), and VAGFC (vascular endothelial growth factor C), and any combination thereof.
  • SOD1 superoxide dismutase 1
  • ALS2 amotrophic lateral sclerosis 2
  • FUS fused in sarcoma
  • TARDBP TAR DNA binding protein
  • VAGFA vascular endothelial growth factor A
  • VAGFB vascular endothelial growth factor B
  • VAGFC vascular endothelial growth factor C
  • proteins associated with prion diseases may include SOD1 (superoxide dismutase 1), ALS2 (amyotrophic lateral sclerosis 2), FUS (fused in sarcoma), TARDBP (TAR DNA binding protein), VAGFA (vascular endothelial growth factor A), VAGFB (vascular endothelial growth factor B), and VAGFC (vascular endothelial growth factor C), and any combination thereof.
  • proteins related to neurodegenerative conditions in prion disorders may include A2M (Alpha-2-Macroglobulin), AATF (Apoptosis antagonizing transcription factor), ACPP (Acid phosphatase prostate), ACTA2 (Actin alpha 2 smooth muscle aorta), ADAM22 (ADAM metallopeptidase domain), ADORA3 (Adenosine A3 receptor), or ADRA 1D (Alpha-1 D adrenergic receptor for Alpha-1D adrenoreceptor), for example.
  • A2M Alpha-2-Macroglobulin
  • AATF Apoptosis antagonizing transcription factor
  • ACPP Acid phosphatase prostate
  • ACTA2 Actin alpha 2 smooth muscle aorta
  • ADAM22 ADAM metallopeptidase domain
  • ADORA3 Adosine A3 receptor
  • ADRA 1D Alpha-1 D adrenergic receptor for Alpha-1D adrenoreceptor
  • proteins associated with Immunodeficiency may include A2M [alpha-2-macroglobulin]; AANAT [arylalkylamine N-acetyltransferase]; ABCA1 [ATP-binding cassette, sub-family A (ABC1), member 1]; ABCA2 [ATP-binding cassette, sub-family A (ABC1), member 2]; or ABCA3 [ATP-binding cassette, sub-family A (ABC 1), member 3]; for example.
  • A2M alpha-2-macroglobulin
  • AANAT arylalkylamine N-acetyltransferase
  • ABCA1 ATP-binding cassette, sub-family A (ABC1), member 1]
  • ABCA2 ATP-binding cassette, sub-family A (ABC1), member 2]
  • ABCA3 ATP-binding cassette, sub-family A (ABC 1), member 3]
  • proteins associated with Trinucleotide Repeat Disorders include AR (androgen receptor), FMR1 (fragile X mental retardation 1), HTT (huntingtin), or DMPK (dystrophia myotonica-protein kinase), FXN (frataxin), ATXN2 (ataxin 2), for example.
  • proteins associated with Neurotransmission Disorders include SST (somatostatin), NOS 1 (nitric oxide synthase 1 (neuronal)), ADRA2A (adrenergic, alpha-2A-, receptor), ADRA2C (adrenergic, alpha-2C—, receptor), TACR1 (tachykinin receptor 1), or HTR2c (5-hydroxytryptamine (serotonin) receptor 2C), for example.
  • neurodevelopmental-associated sequences include A2BP1 [ataxin 2-binding protein 1], AADAT [aminoadipate aminotransferase], AANAT [arylalkylamine N-acetyltransferase], ABAT [4-aminobutyrate aminotransferase], ABCA1 [ATP-binding cassette, sub-family A (ABC1), member 1], or ABCA13 [ATP-binding cassette, sub-family A (ABC1), member 13], for example.
  • A2BP1 ataxin 2-binding protein 1
  • AADAT aminoadipate aminotransferase
  • AANAT arylalkylamine N-acetyltransferase
  • ABAT 4-aminobutyrate aminotransferase
  • ABCA1 ATP-binding cassette, sub-family A (ABC1), member 1
  • ABCA13 ATP-binding cassette, sub-family A (ABC1), member 13
  • preferred conditions treatable with the present system include may be selected from: Aicardi-Goutiéres Syndrome; Alexander Disease; Allan-Herndon-Dudley Syndrome; POLG-Related Disorders; Alpha-Mannosidosis (Type II and III); Alström Syndrome; Angelman; Syndrome; Ataxia-Telangiectasia; Neuronal Ceroid-Lipofuscinoses; Beta-Thalassemia; Bilateral Optic Atrophy and (Infantile) Optic Atrophy Type 1; Retinoblastoma (bilateral); Canavan Disease; Cerebrooculofacioskeletal Syndrome 1 [COFS1]; Cerebrotendinous Xanthomatosis; Cornelia de Lange Syndrome; MAPT-Related Disorders; Genetic Prion Diseases; Dravet Syndrome; Early-Onset Familial Alzheimer Disease; Friedreich Ataxia [FRDA]; Fryns Syndrome; Fucosidosis; Fukuyama Congenital Muscular Dystrophy; Galactosialidos
  • the present system can be used to target any polynucleotide sequence of interest.
  • Some examples of conditions or diseases that might be usefully treated using the present system are included in the Tables above and examples of genes currently associated with those conditions are also provided there. However, the genes exemplified are not exhaustive.
  • An example type II CRISPR system is the type II CRISPR locus from Streptococcus pyogenes SF370, which contains a cluster of four genes Cas9, Cas1, Cas2, and Csn1, as well as two non-coding RNA elements, tracrRNA and a characteristic array of repetitive sequences (direct repeats) interspaced by short stretches of non-repetitive sequences (spacers, about 30 bp each).
  • DSB targeted DNA double-strand break
  • tracrRNA hybridizes to the direct repeats of pre-crRNA, which is then processed into mature crRNAs containing individual spacer sequences.
  • the mature crRNA:tracrRNA complex directs Cas9 to the DNA target consisting of the protospacer and the corresponding PAM via heteroduplex formation between the spacer region of the crRNA and the protospacer DNA.
  • Cas9 mediates cleavage of target DNA upstream of PAM to create a DSB within the protospacer ( FIG. 2A ).
  • This example describes an example process for adapting this RNA-programmable nuclease system to direct CRISPR complex activity in the nuclei of eukaryotic cells.
  • HEK cell line HEK 293FT Human embryonic kidney (HEK) cell line HEK 293FT (Life Technologies) was maintained in Dulbecco's modified Eagle's Medium (DMEM) supplemented with 10% fetal bovine serum (HyClone), 2 mM GlutaMAX (Life Technologies), 100 U/mL penicillin, and 100 ⁇ g/mL streptomycin at 37° C. with 5% CO 2 incubation.
  • DMEM Dulbecco's modified Eagle's Medium
  • HyClone fetal bovine serum
  • 2 mM GlutaMAX Human neuro2A (N2A) cell line (ATCC) was maintained with DMEM supplemented with 5% fetal bovine serum (HyClone), 2 mM GlutaMAX (Life Technologies), 100 U/mL penicillin, and 100 ⁇ g/mL streptomycin at 37° C. with 5% CO 2 .
  • HEK 293FT or N2A cells were seeded into 24-well plates (Corning) one day prior to transfection at a density of 200,000 cells per well. Cells were transfected using Lipofectamine 2000 (Life Technologies) following the manufacturer's recommended protocol. For each well of a 24-well plate a total of 800 ng of plasmids were used.
  • HEK 293FT or N2A cells were transfected with plasmid DNA as described above. After transfection, the cells were incubated at 37° C. for 72 hours before genomic DNA extraction. Genomic DNA was extracted using the QuickExtract DNA extraction kit (Epicentre) following the manufacturer's protocol. Briefly, cells were resuspended in QuickExtract solution and incubated at 65° C. for 15 minutes and 98° C. for 10 minutes. Extracted genomic DNA was immediately processed or stored at ⁇ 20° C.
  • the genomic region surrounding a CRISPR target site for each gene was PCR amplified, and products were purified using QiaQuick Spin Column (Qiagen) following manufacturer's protocol.
  • a total of 400 ng of the purified PCR products were mixed with 2 ⁇ l 10 ⁇ Tag polymerase PCR buffer (Enzymatics) and ultrapure water to a final volume of 20 ⁇ l, and subjected to a re-annealing process to enable heteroduplex formation: 95° C. for 10 min, 95° C. to 85° C. ramping at ⁇ 2° C./s, 85° C. to 25° C. at ⁇ 0.25° C./s, and 25° C. hold for 1 minute.
  • HEK 293FT and N2A cells were transfected with plasmid DNA, and incubated at 37° C. for 72 hours before genomic DNA extraction as described above.
  • the target genomic region was PCR amplified using primers outside the homology arms of the homologous recombination (HR) template. PCR products were separated on a 1% agarose gel and extracted with MinElute GelExtraction Kit (Qiagen). Purified products were digested with HindIII (Fermentas) and analyzed on a 6% Novex TBE poly-acrylamide gel (Life Technologies).
  • RNA secondary structure prediction was performed using the online webserver RNAfold developed at Institute for Theoretical Chemistry at the University of Vienna, using the centroid structure prediction algorithm (see e.g. A. R. Gruber et al., 2008, Cell 106(1): 23-24; and PA Can and GM Church, 2009, Nature Biotechnology 27(12): 1151-62).
  • pCRISPR locus 1 Elements of the S. pyogenes CRISPR locus 1 sufficient for CRISPR activity were reconstituted in E. coli using pCRISPR plasmid (schematically illustrated in FIG. 10A ).
  • pCRISPR contained tracrRNA, SpCas9, and a leader sequence driving the crRNA array.
  • Spacers also referred to as “guide sequences” were inserted into the crRNA array between BsaI sites using annealed oligonucleotides, as illustrated.
  • Challenge plasmids used in the interference assay were constructed by inserting the protospacer (also referred to as a “target sequence”) sequence along with an adjacent CRISPR motif sequence (PAM) into pUC19 (see FIG. 10B ).
  • PAM CRISPR motif sequence
  • FIG. 10C provides a schematic representation of the interference assay. Chemically competent E. coli strains already carrying pCRISPR and the appropriate spacer were transformed with the challenge plasmid containing the corresponding protospacer-PAM sequence. pUC19 was used to assess the transformation efficiency of each pCRISPR-carrying competent strain. CRISPR activity resulted in cleavage of the pPSP plasmid carrying the protospacer, precluding ampicillin resistance otherwise conferred by pUC 19 lacking the protospacer. FIG. 10D illustrates competence of each pCRISPR-carrying E. coli strain used in assays illustrated in FIG. 4C .
  • HEK 293FT cells were maintained and transfected as stated above. Cells were harvested by trypsinization followed by washing in phosphate buffered saline (PBS). Total cell RNA was extracted with TRI reagent (Sigma) following manufacturer's protocol. Extracted total RNA was quantified using Naonodrop (Thermo Scientific) and normalized to same concentration.
  • RNAs were mixed with equal volumes of 2 ⁇ loading buffer (Ambion), heated to 95° C. for 5 min, chilled on ice for 1 min, and then loaded onto 8% denaturing polyacrylamide gels (SequaGel, National Diagnostics) after pre-running the gel for at least 30 minutes. The samples were electrophoresed for 1.5 hours at 40 W limit. Afterwards, the RNA was transferred to Hybond N+membrane (GE Healthcare) at 300 mA in a semi-dry transfer apparatus (Bio-rad) at room temperature for 1.5 hours. The RNA was crosslinked to the membrane using autocrosslink button on Stratagene UV Crosslinker the Stratalinker (Stratagene).
  • the membrane was pre-hybridized in ULTRAhyb-Oligo Hybridization Buffer (Ambion) for 30 min with rotation at 42° C., and probes were then added and hybridized overnight. Probes were ordered from IDT and labeled with [gamma- 32 P] ATP (Perkin Elmer) with T4 polynucleotide kinase (New England Biolabs). The membrane was washed once with pre-warmed (42° C.) 2 ⁇ SSC, 0.5% SDS for 1 min followed by two 30 minute washes at 42° C. The membrane was exposed to a phosphor screen for one hour or overnight at room temperature and then scanned with a phosphorimager (Typhoon).
  • CRISPR locus elements including tracrRNA, Cas9, and leader were PCR amplified from Streptococcus pyogenes SF370 genomic DNA with flanking homology arms for Gibson Assembly. Two BsaI type IIS sites were introduced in between two direct repeats to facilitate easy insertion of spacers ( FIG. 9 ). PCR products were cloned into EcoRV-digested pACYC 184 downstream of the tet promoter using Gibson Assembly Master Mix (NEB). Other endogenous CRISPR system elements were omitted, with the exception of the last 50 bp of Csn2.
  • Oligos Integrated DNA Technology encoding spacers with complimentary overhangs were cloned into the BsaI-digested vector pDC000 (NEB) and then ligated with T7 ligase (Enzymatics) to generate pCRISPR plasmids.
  • Challenge plasmids containing spacers with PAM sequences also referred to herein as “CRISPR motif sequences” were created by ligating hybridized oligos carrying compatible overhangs (Integrated DNA Technology) into BamHI-digested pUC19. Cloning for all constructs was performed in E. coli strain JM109 (Zymo Research).
  • pCRISPR-carrying cells were made competent using the Z-Competent E. coli Transformation Kit and Buffer Set (Zymo Research, T3001) according to manufacturer's instructions.
  • Z-Competent E. coli Transformation Kit and Buffer Set Zymo Research, T3001
  • 50 uL aliquots of competent cells carrying pCRISPR were thawed on ice and transformed with 1 ng of spacer plasmid or pUC19 on ice for 30 minutes, followed by 45 second heat shock at 42° C. and 2 minutes on ice. Subsequently, 250 ul SOC (Invitrogen) was added followed by shaking incubation at 37° C.
  • a nuclear localization signal was included at the amino (N)- or carboxyl (C)-termini of both SpCas9 and SpRNase III ( FIG. 2B ).
  • a fluorescent protein marker was also included at the N- or C-termini of both proteins ( FIG. 2B ).
  • a version of SpCas9 with an NLS attached to both N- and C-termini (2xNLS-SpCas9) was also generated.
  • Constructs containing NLS-fused SpCas9 and SpRNase III were transfected into 293FT human embryonic kidney (HEK) cells, and the relative positioning of the NLS to SpCas9 and SpRNase III was found to affect their nuclear localization efficiency. Whereas the C-terminal NLS was sufficient to target SpRNase III to the nucleus, attachment of a single copy of these particular NLS's to either the N- or C-terminus of SpCas9 was unable to achieve adequate nuclear localization in this system.
  • the C-terminal NLS was that of nucleoplasmin (KRPAATKKAGQAKKKK (SEQ ID NO: 2)), and the C-terminal NLS was that of the SV40 large T-antigen (PKKKRKV (SEQ ID NO: 1)).
  • KRPAATKKAGQAKKKK SEQ ID NO: 2
  • PKKRKV SEQ ID NO: 1
  • the tracrRNA from the CRISPR locus of S. pyogenes SF370 has two transcriptional start sites, giving rise to two transcripts of 89-nucleotides (nt) and 171 nt that are subsequently processed into identical 75 nt mature tracrRNAs.
  • the shorter 89 nt tracrRNA was selected for expression in mammalian cells (expression constructs illustrated in FIG. 7A , with functionality as determined by results of the Surveyor assay shown in FIG. 7B ). Transcription start sites are marked as +1, and transcription terminator and the sequence probed by northern blot are also indicated. Expression of processed tracrRNA was also confirmed by Northern blot.
  • FIG. 7A expression constructs illustrated in FIG. 7A , with functionality as determined by results of the Surveyor assay shown in FIG. 7B .
  • Transcription start sites are marked as +1, and transcription terminator and the sequence probed by northern blot are also indicated. Expression of processed tracrRNA was also confirmed by
  • FIG. 7C shows results of a Northern blot analysis of total RNA extracted from 293FT cells transfected with U6 expression constructs carrying long or short tracrRNA, as well as SpCas9 and DR-EMX1(1)-DR.
  • Left and right panels are from 293FT cells transfected without or with SpRNase III, respectively.
  • U6 indicate loading control blotted with a probe targeting human U6 snRNA.
  • Transfection of the short tracrRNA expression construct led to abundant levels of the processed form of tracrRNA ( ⁇ 75 bp). Very low amounts of long tracrRNA are detected on the Northern blot.
  • RNA polymerase III-based U6 promoter was selected to drive the expression of tracrRNA ( FIG. 2C ).
  • a U6 promoter-based construct was developed to express a pre-crRNA array consisting of a single spacer flanked by two direct repeats (DRs, also encompassed by the term “tracr-mate sequences”; FIG. 2C ).
  • the initial spacer was designed to target a 33-base-pair (bp) target site (30-bp protospacer plus a 3-bp CRISPR motif (PAM) sequence satisfying the NGG recognition motif of Cas9) in the human EMX1 locus ( FIG. 2C ), a key gene in the development of the cerebral cortex.
  • bp 33-base-pair
  • PAM 3-bp CRISPR motif
  • HEK 293FT cells were transfected with combinations of CRISPR components. Since DSBs in mammalian nuclei are partially repaired by the non-homologous end joining (NHEJ) pathway, which leads to the formation of indels, the Surveyor assay was used to detect potential cleavage activity at the target EMX1 locus ( FIG. 8 ) (see e.g. Guschin et al., 2010, Methods Mol Biol 649: 247).
  • NHEJ non-homologous end joining
  • FIG. 14 provides an additional Northern blot analysis of crRNA processing in mammalian cells.
  • FIG. 14A illustrates a schematic showing the expression vector for a single spacer flanked by two direct repeats (DR-EMX1(1)-DR). The 30 bp spacer targeting the human EMX1 locus protospacer 1 (see FIG. 6 ) and the direct repeat sequences are shown in the sequence beneath FIG. 14A . The line indicates the region whose reverse-complement sequence was used to generate Northern blot probes for EMX1(1) crRNA detection.
  • FIG. 14B shows a Northern blot analysis of total RNA extracted from 293FT cells transfected with U6 expression constructs carrying DR-EMX1(1)-DR.
  • DR-EMX 1(1)-DR was processed into mature crRNAs only in the presence of SpCas9 and short tracrRNA and was not dependent on the presence of SpRNase III.
  • the mature crRNA detected from transfected 293 FT total RNA is ⁇ 33 bp and is shorter than the 39-42 bp mature crRNA from S. pyogenes .
  • FIG. 2 illustrates the bacterial CRISPR system described in this example.
  • FIG. 2A illustrates a schematic showing the CRISPR locus 1 from Streptococcus pyogenes SF370 and a proposed mechanism of CRISPR-mediated DNA cleavage by this system.
  • Mature crRNA processed from the direct repeat-spacer array directs Cas9 to genomic targets consisting of complimentary protospacers and a protospacer-adjacent motif (PAM).
  • PAM protospacer-adjacent motif
  • FIG. 2B illustrates engineering of S.
  • FIG. 2C illustrates mammalian expression of SpCas9 and SpRNase III driven by the constitutive EF1a promoter and tracrRNA and pre-crRNA array (DR-Spacer-DR) driven by the RNA Pol3 promoter U6 to promote precise transcription initiation and termination.
  • DR-Spacer-DR pre-crRNA array
  • FIG. 2D illustrates surveyor nuclease assay for SpCas9-mediated minor insertions and deletions.
  • FIG. 2E illustrates a schematic representation of base pairing between target locus and EMX1-targeting crRNA, as well as an example chromatogram showing a micro deletion adjacent to the SpCas9 cleavage site.
  • a chimeric crRNA-tracrRNA hybrid design was adapted, where a mature crRNA (comprising a guide sequence) is fused to a partial tracrRNA via a stem-loop to mimic the natural crRNA:tracrRNA duplex ( FIG. 3A ).
  • a bicistronic expression vector was created to drive co-expression of a chimeric RNA and SpCas9 in transfected cells ( FIGS. 3A and 8 ).
  • the bicistronic vectors were used to express a pre-crRNA (DR-guide sequence-DR) with SpCas9, to induce processing into crRNA with a separately expressed tracrRNA (compare FIG.
  • FIG. 9 provides schematic illustrations of bicistronic expression vectors for pre-crRNA array ( FIG. 9A ) or chimeric crRNA (represented by the short line downstream of the guide sequence insertion site and upstream of the EF1 ⁇ promoter in FIG. 9B ) with hSpCas9, showing location of various elements and the point of guide sequence insertion.
  • the expanded sequence around the location of the guide sequence insertion site in FIG. 9B also shows a partial DR sequence (GTTTTAGAGCTA (SEQ ID NO: 27)) and a partial tracrRNA sequence (TAGCAAGTTAAAATAAGGCTAGTCCGTTTTT (SEQ ID NO: 28)).
  • RNA design facilitates cleavage of human EMX1 locus with approximately a 4.7% modification rate ( FIG. 4 ).
  • FIG. 15 illustrates the selection of some additional targeted protospacers in human PVALB ( FIG. 15A ) and mouse Th ( FIG. 15B ) loci. Schematics of the gene loci and the location of three protospacers within the last exon of each are provided.
  • the underlined sequences include 30 bp of protospacer sequence and 3 bp at the 3′ end corresponding to the PAM sequences.
  • Protospacers on the sense and anti-sense strands are indicated above and below the DNA sequences, respectively.
  • a modification rate of 6.3% and 0.75% was achieved for the human PVALB and mouse Th loci respectively, demonstrating the broad applicability of the CRISPR system in modifying different loci across multiple organisms ( FIGS. 3B and 6 ). While cleavage was only detected with one out of three spacers for each locus using the chimeric constructs, all target sequences were cleaved with efficiency of indel production reaching 27% when using the co-expressed pre-crRNA arrangement ( FIG. 6 ).
  • FIG. 13 provides a further illustration that SpCas9 can be reprogrammed to target multiple genomic loci in mammalian cells.
  • FIG. 13A provides a schematic of the human EMX1 locus showing the location of five protospacers, indicated by the underlined sequences.
  • FIG. 13B provides a schematic of the pre-crRNA/trcrRNA complex showing hybridization between the direct repeat region of the pre-crRNA and tracrRNA (top), and a schematic of a chimeric RNA design comprising a 20 bp guide sequence, and tracr mate and tracr sequences consisting of partial direct repeat and tracrRNA sequences hybridized in a hairpin structure (bottom).
  • Results of a Surveyor assay comparing the efficacy of Cas9-mediated cleavage at five protospacers in the human EMX1 locus is illustrated in FIG. 13C .
  • Each protospacer is targeted using either processed pre-crRNA/tracrRNA complex (crRNA) or chimeric RNA (chiRNA).
  • crRNA pre-crRNA/tracrRNA complex
  • chiRNA chimeric RNA
  • RNA Since the secondary structure of RNA can be crucial for intermolecular interactions, a structure prediction algorithm based on minimum free energy and Boltzmann-weighted structure ensemble was used to compare the putative secondary structure of all guide sequences used in our genome targeting experiment ( FIG. 3B ) (see e.g. Gruber et al., 2008, Nucleic Acids Research, 36: W70). Analysis revealed that in most cases, the effective guide sequences in the chimeric crRNA context were substantially free of secondary structure motifs, whereas the ineffective guide sequences were more likely to form internal secondary structures that could prevent base pairing with the target protospacer DNA. It is thus possible that variability in the spacer secondary structure might impact the efficiency of CRISPR-mediated interference when using a chimeric crRNA.
  • FIG. 3 illustrates example expression vectors.
  • FIG. 3A provides a schematic of a bi-cistronic vector for driving the expression of a synthetic crRNA-tracrRNA chimera (chimeric RNA) as well as SpCas9.
  • the chimeric guide RNA contains a 20-bp guide sequence corresponding to the protospacer in the genomic target site.
  • the folding algorithm produced an output with each base colored according to its probability of assuming the predicted secondary structure, as indicated by a rainbow scale that is reproduced in FIG. 3B in gray scale.
  • FIG. 44 illustrates single expression vectors incorporating a U6 promoter linked to an insertion site for a guide oligo, and a Cbh promoter linked to SpCas9 coding sequence.
  • the vector shown in FIG. 44 b includes a tracrRNA coding sequence linked to an H1 promoter.
  • FIG. 4A illustrates results of a Surveyor nuclease assay comparing the cleavage efficiency of Cas9 when paired with different mutant chimeric RNAs.
  • Single-base mismatch up to 12-bp 5′ of the PAM substantially abrogated genomic cleavage by SpCas9, whereas spacers with mutations at farther upstream positions retained activity against the original protospacer target ( FIG. 4B ).
  • FIG. 4C provides a schematic showing the design of TALENs targeting EMX1
  • FIG. 5C provides a schematic illustration of the HR strategy, with relative locations of recombination points and primer annealing sequences (arrows). SpCas9 and SpCas9n indeed catalyzed integration of the HR template into the EMX1 locus.
  • FIG. 2A Expression constructs mimicking the natural architecture of CRISPR loci with arrayed spacers ( FIG. 2A ) were constructed to test the possibility of multiplexed sequence targeting.
  • FIG. 4F showing both a schematic design of the crRNA array and a Surveyor blot showing efficient mediation of cleavage.
  • FIG. 4G shows a 1.6% deletion efficacy (3 out of 182 amplicons; FIG. 4G ) was detected. This demonstrates that the CRISPR system can mediate multiplexed editing within a single genome.
  • RNA to program sequence-specific DNA cleavage defines a new class of genome engineering tools for a variety of research and industrial applications.
  • CRISPR system can be further improved to increase the efficiency and versatility of CRISPR targeting.
  • Optimal Cas9 activity may depend on the availability of free Mg 2+ at levels higher than that present in the mammalian nucleus (see e.g. Jinek et al., 2012, Science, 337:816), and the preference for an NGG motif immediately downstream of the protospacer restricts the ability to target on average every 12-bp in the human genome ( FIG. 11 , evaluating both plus and minus strands of human chromosomal sequences).
  • FIG. 12 illustrates adaptation of the Type II CRISPR system from CRISPR 1 of Streptococcus thermophilus LMD-9 for heterologous expression in mammalian cells to achieve CRISPR-mediated genome editing.
  • FIG. 12A provides a Schematic illustration of CRISPR 1 from S. thermophilus LMD-9.
  • FIG. 12B illustrates the design of an expression system for the S. thermophilus CRISPR system.
  • Human codon-optimized hStCas9 is expressed using a constitutive EF1 ⁇ promoter. Mature versions of tracrRNA and crRNA are expressed using the U6 promoter to promote precise transcription initiation. Sequences from the mature crRNA and tracrRNA are illustrated. A single base indicated by the lower case “a” in the crRNA sequence is used to remove the polyU sequence, which serves as a RNA polIII transcriptional terminator.
  • FIG. 12C provides a schematic showing guide sequences targeting the human EMX1 locus as well as their predicted secondary structures. The modification efficiency at each target site is indicated below the RNA secondary structures. The algorithm generating the structures colors each base according to its probability of assuming the predicted secondary structure, which is indicated by a rainbow scale reproduced in FIG.
  • FIG. 12C shows the results of hStCas9-mediated cleavage in the target locus using the Surveyor assay.
  • RNA guide spacers 1 and 2 induced 14% and 6.4%, respectively.
  • Statistical analysis of cleavage activity across biological replica at these two protospacer sites is also provided in FIG. 6 .
  • FIG. 16 provides a schematic of additional protospacer and corresponding PAM sequence targets of the S. thermophilus CRISPR system in the human EMX1 locus. Two protospacer sequences are highlighted and their corresponding PAM sequences satisfying NNAGAAW motif are indicated by underlining 3′ with respect to the corresponding highlighted sequence. Both protospacers target the anti-sense strand.
  • a software program is designed to identify candidate CRISPR target sequences on both strands of an input DNA sequence based on desired guide sequence length and a CRISPR motif sequence (PAM) for a specified CRISPR enzyme.
  • PAM CRISPR motif sequence
  • target sites for Cas9 from S. pyogenes with PAM sequences NGG, may be identified by searching for 5′-N x -NGG-3′ both on the input sequence and on the reverse-complement of the input.
  • target sites for Cas9 of S. thermophilus CRISPR1, with PAM sequence NNAGAAW may be identified by searching for 5′-N x -NNAGAAW-3′ (SEQ ID NO: 29) both on the input sequence and on the reverse-complement of the input.
  • target sites for Cas9 of S. thermophilus CRISPR3, with PAM sequence NGGNG may be identified by searching for 5′-N x -NGGNG-3′ both on the input sequence and on the reverse-complement of the input.
  • the value “x” in N x may be fixed by the program or specified by the user, such as 20.
  • the program filters out sequences based on the number of times they appear in the relevant reference genome.
  • the filtering step may be based on the seed sequence.
  • results are filtered based on the number of occurrences of the seed:PAM sequence in the relevant genome.
  • the user may be allowed to choose the length of the seed sequence.
  • the user may also be allowed to specify the number of occurrences of the seed:PAM sequence in a genome for purposes of passing the filter.
  • the default is to screen for unique sequences. Filtration level is altered by changing both the length of the seed sequence and the number of occurrences of the sequence in the genome.
  • the program may in addition or alternatively provide the sequence of a guide sequence complementary to the reported target sequence(s) by providing the reverse complement of the identified target sequence(s).
  • FIG. 18 a illustrates a schematic of a bicistronic expression vector for chimeric RNA and Cas9. Cas9 is driven by the CBh promoter and the chimeric RNA is driven by a U6 promoter.
  • the chimeric guide RNA consists of a 20 bp guide sequence (Ns) joined to the tracr sequence (running from the first “U” of the lower strand to the end of the transcript), which is truncated at various positions as indicated.
  • the guide and tracr sequences are separated by the tracr-mate sequence GUUUUAGAGCUA (SEQ ID NO: 30) followed by the loop sequence GAAA.
  • Results of SURVEYOR assays for Cas9-mediated indels at the human EMX1 and PVALB loci are illustrated in FIGS. 18 b and 18 c , respectively. Arrows indicate the expected SURVEYOR fragments.
  • ChiRNAs are indicated by their “+n” designation, and crRNA refers to a hybrid RNA where guide and tracr sequences are expressed as separate transcripts. Quantification of these results, performed in triplicate, are illustrated by histogram in FIGS. 19 a and 19 b , corresponding to FIGS.
  • Protospacer IDs and their corresponding genomic target, protospacer sequence, PAM sequence, and strand location are provided in Table D. Guide sequences were designed to be complementary to the entire protospacer sequence in the case of separate transcripts in the hybrid system, or only to the underlined portion in the case of chimeric RNAs.
  • HEK cell line 293FT Human embryonic kidney (HEK) cell line 293FT (Life Technologies) was maintained in Dulbecco's modified Eagle's Medium (DMEM) supplemented with 10% fetal bovine serum (HyClone), 2 mM GlutaMAX (Life Technologies), 100 U/mL penicillin, and 100 ⁇ n/mL streptomycin at 37° C. with 5% CO 2 incubation. 293FT cells were seeded onto 24-well plates (Corning) 24 hours prior to transfection at a density of 150,000 cells per well. Cells were transfected using Lipofectamine 2000 (Life Technologies) following the manufacturer's recommended protocol. For each well of a 24-well plate, a total of 500 ng plasmid was used.
  • DMEM Dulbecco's modified Eagle's Medium
  • HyClone fetal bovine serum
  • 2 mM GlutaMAX 100 U/mL penicillin
  • streptomycin 100 ⁇ n/mL streptomycin
  • 293FT cells were transfected with plasmid DNA as described above. Cells were incubated at 37° C. for 72 hours post-transfection prior to genomic DNA extraction. Genomic DNA was extracted using the QuickExtract DNA Extraction Solution (Epicentre) following the manufacturer's protocol. Briefly, pelleted cells were resuspended in QuickExtract solution and incubated at 65° C. for 15 minutes and 98° C. for 10 minutes. The genomic region flanking the CRISPR target site for each gene was PCR amplified (primers listed in Table E), and products were purified using QiaQuick Spin Column (Qiagen) following the manufacturer's protocol.
  • QuickExtract DNA Extraction Solution Epicentre
  • 400 ng total of the purified PCR products were mixed with 2 ⁇ l 10 ⁇ Taq DNA Polymerase PCR buffer (Enzymatics) and ultrapure water to a final volume of 20 ⁇ l, and subjected to a re-annealing process to enable heteroduplex formation: 95° C. for 10 min, 95° C. to 85° C. ramping at ⁇ 2° C./s, 85° C. to 25° C. at ⁇ 0.25° C./s, and 25° C. hold for 1 minute.
  • each SpCas9 target site was operationally defined as a 20 bp sequence followed by an NGG protospacer adjacent motif (PAM) sequence, and we identified all sequences satisfying this 5′-N 20 —NGG-3′ definition on all chromosomes.
  • PAM NGG protospacer adjacent motif
  • a seed sequence which can be, for example, approximately 11-12 bp sequence 5′ from the PAM sequence
  • 5′-NNNNNNNNN-NGG-3′ sequences were selected to be unique in the relevant genome. All genomic sequences were downloaded from the UCSC Genome Browser (Human genome hg19, Mouse genome mm9, Rat genome rn5, Zebrafish genome danRer7, D. melanogaster genome dm4 and C. elegans genome ce10). The full search results are available to browse using UCSC Genome Browser information. An example visualization of some target sites in the human genome is provided in FIG. 21 .
  • chiRNA(+n) indicate that up to the +n nucleotide of wild-type tracrRNA is included in the chimeric RNA construct, with values of 48, 54, 67, and 85 used for n.
  • Chimeric RNAs containing longer fragments of wild-type tracrRNA (chiRNA(+67) and chiRNA(+85)) mediated DNA cleavage at all three EMX1 target sites, with chiRNA(+85) in particular demonstrating significantly higher levels of DNA cleavage than the corresponding crRNA/tracrRNA hybrids that expressed guide and tracr sequences in separate transcripts ( FIGS. 18 b and 19 a ).
  • Two sites in the PVALB locus that yielded no detectable cleavage using the hybrid system (guide sequence and tracr sequence expressed as separate transcripts) were also targeted using chiRNAs.
  • chiRNA(+67) and chiRNA(+85) were able to mediate significant cleavage at the two PVALB protospacers ( FIGS. 18 c and 19 b ).
  • the secondary structure formed by the 3′ end of the tracrRNA may play a role in enhancing the rate of CRISPR complex formation.
  • An illustration of predicted secondary structures for each of the chimeric RNAs used in this example is provided in FIG. 21 .
  • the secondary structure was predicted using RNAfold (http://raa.tbi.univie.ac.at/egi-bin/RNAfold.cgi) using minimum free energy and partition function algorithm. Pseudocolor for each based (reproduced in grayscale) indicates the probability of pairing.
  • chimeric RNA may be loaded onto Cas9 more efficiently than its native hybrid counterpart.
  • all predicted unique target sites for the S. pyogenes Cas9 were computationally identified in the human, mouse, rat, zebra fish, C. elegans , and D. melanogaster genomes.
  • Chimeric RNAs can be designed for Cas9 enzymes from other microbes to expand the target space of CRISPR RNA-programmable nucleases.
  • FIG. 22 illustrates an exemplary bicistronic expression vector for expression of chimeric RNA including up to the +85 nucleotide of wild-type tracr RNA sequence, and SpCas9 with nuclear localization sequences.
  • SpCas9 is expressed from a CBh promoter and terminated with the bGH polyA signal (bGH pA).
  • the expanded sequence illustrated immediately below the schematic corresponds to the region surrounding the guide sequence insertion site, and includes, from 5′ to 3′,3′-portion of the U6 promoter (first shaded region), BbsI cleavage sites (arrows), partial direct repeat (tracr mate sequence GTTTTAGAGCTA (SEQ ID NO: 27), underlined), loop sequence GAAA, and +85 tracr sequence (underlined sequence following loop sequence).
  • An exemplary guide sequence insert is illustrated below the guide sequence insertion site, with nucleotides of the guide sequence for a selected target represented by an “N”.
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1 Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1 Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1 Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1 Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1 Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1 Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1 Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR1 Cas9 (with PAM of NNAGAAW)
  • Example chimeric RNA for S. thermophilus LMD-9 CRISPR3 Cas9 (with PAM of NGGNG)
  • CRISPR-associated endonuclease Cas9 to introduce precise mutations in the genomes of Streptococcus pneumoniae and Escherichia coli .
  • the approach relied on Cas9-directed cleavage at the targeted site to kill unmutated cells and circumvented the need for selectable markers or counter-selection systems.
  • Cas9 specificity was reprogrammed by changing the sequence of short CRISPR RNA (crRNA) to make single- and multi-nucleotide changes carried on editing templates. Simultaneous use of two crRNAs enabled multiplex mutagenesis. In S.
  • mutagenesis in eukaryotes is achieved by the use of sequence-specific nucleases that promote homologous recombination of a template DNA containing the mutation of interest.
  • Zinc finger nucleases ZFNs
  • TALENs transcription activator-like effector nucleases
  • homing meganucleases can be programmed to cleave genomes in specific locations, but these approaches require engineering of new enzymes for each target sequence.
  • mutagenesis methods either introduce a selection marker in the edited locus or require a two-step process that includes a counter-selection system.
  • phage recombination proteins have been used for recombineering, a technique that promotes homologuous recombination of linear DNA or oligonucleotides.
  • recombineering efficiency can be relatively low (0.1-10% for point mutations down to 10 ⁇ 5 -10 ⁇ 6 for larger modifications), in many cases requiring the screening of a large number of colonies. Therefore new technologies that are affordable, easy to use and efficient are still in need for the genetic engineering of both eukaryotic and prokaryotic organisms.
  • CRISPR loci are composed of a series of repeats separated by ‘spacer’ sequences that match the genomes of bacteriophages and other mobile genetic elements.
  • the repeat-spacer array is transcribed as a long precursor and processed within repeat sequences to generate small crRNA that specify the target sequences (also known as protospacers) cleaved by CRISPR systems.
  • Essential for cleavage is the presence of a sequence motif immediately downstream of the target region, known as the protospacer-adjacent motif (PAM).
  • CRISPR-associated (cas) genes usually flank the repeat-spacer array and encode the enzymatic machinery responsible for crRNA biogenesis and targeting.
  • Cas9 is a dsDNA endonuclease that uses a crRNA guide to specify the site of cleavage. Loading of the crRNA guide onto Cas9 occurs during the processing of the crRNA precursor and requires a small RNA antisense to the precursor, the tracrRNA, and RNAse III. In contrast to genome editing with ZFNs or TALENs, changing Cas9 target specificity does not require protein engineering but only the design of the short crRNA guide.
  • Applicants recently showed in S. pneumoniae that the introduction of a CRISPR system targeting a chromosomal locus leads to the killing of the transformed cells. It was observed that occasional survivors contained mutations in the target region, suggesting that Cas9 dsDNA endonuclease activity against endogenous targets could be used for genome editing. Applicants showed that marker-less mutations can be introduced through the transformation of a template DNA fragment that will recombine in the genome and eliminate Cas9 target recognition. Directing the specificity of Cas9 with several different crRNAs allows for the introduction of multiple mutations at the same time. Applicants also characterized in detail the sequence requirements for Cas9 targeting and show that the approach can be combined with recombineering for genome editing in E. coli.
  • S. pneumoniae strain crR6 contains a Cas9-based CRISPR system that cleaves a target sequence present in the bacteriophage ⁇ 8232.5. This target was integrated into the srtA chromosomal locus of a second strain R6 8232.5 . An altered target sequence containing a mutation in the PAM region was integrated into the srtA locus of a third strain R6 370.1 , rendering this strain ‘immune’ to CRISPR cleavage ( FIG. 28 a ). Applicants transformed R6 8232.5 and R6 370.1 cells with genomic DNA from crR6 cells, expecting that successful transformation of R6 8232.5 cells should lead to cleavage of the target locus and cell death.
  • R6 8232.5 transformants albeit with approximately 10-fold less efficiency than R6 370.1 transformants ( FIG. 28 b ).
  • Genetic analysis of eight R6 8232.5 transformants revealed that the great majority are the product of a double recombination event that eliminates the toxicity of Cas9 targeting by replacing the ⁇ 8232.5 target with the crR6 genome's wild-type srtA locus, which does not contain the protospacer required for Cas9 recognition.
  • Applicants modified the CRISPR locus in strain crR6 by deleting cas1, cast and csn2, genes which have been shown to be dispensable for CRISPR targeting, yielding strain crR6M ( FIG. 28 a ). This strain retained the same properties of crR6 ( FIG. 28 b ).
  • Applicants co-transformed R6 8232.5 cells with PCR products of the wild-type srtA gene or the mutant R6 370.1 target, either of which should be resistant to cleavage by Cas9.
  • next two bases had no detectable effect on the NGG PAM (See section “Analysis of deep sequencing data”), demonstrating that the NGGNN sequence was sufficient to license Cas9 activity.
  • Partial targeting was observed for NAG PAM sequences ( FIG. 24 b ).
  • the NNGGN pattern partially inactivated CRISPR targeting (Table G), indicating that the NGG motif can still be recognized by Cas9 with reduced efficiency when shifted by 1 bp.
  • Another way to disrupt Cas9-mediated cleavage is to introduce mutations in the protospacer region of the editing template. It is known that point mutations within the ‘seed sequence’ (the 8 to 10 protospacer nucleotides immediately adjacent to the PAM) can abolish cleavage by CRISPR nucleases. However, the exact length of this region is not known, and it is unclear whether mutations to any nucleotide in the seed can disrupt Cas9 target recognition. Applicants followed the same deep sequencing approach described above to randomize the entire protospacer sequence involved in base pair contacts with the crRNA and to determine all sequences that disrupt targeting. Each position of the 20 matching nucleotides (14) in the spcl target present in R6 8232.5 cells ( FIG.
  • Applicants engineered strain crR6Rk a strain in which spacers can be easily introduced by PCR ( FIG. 33 ).
  • R481A R ⁇ A
  • NE ⁇ AA N563A,E564A
  • the R ⁇ A editing template created a three-nucleotide mismatch on the protospacer seed sequence (CGT to GCA, also introducing a BtgZI restriction site).
  • CCT to GCA protospacer seed sequence
  • BtgZI restriction site a synonymous mutation that created an inactive PAM (TGG to TTG) along with mutations that are 218 nt downstream of the protospacer region (AAT GAA to GCT GCA, also generating a TseI restriction site).
  • Cas9-mediated editing can also be used to generate multiple mutations for the study of biological pathways. Applicants decided to illustrate this for the sortase-dependent pathway that anchors surface proteins to the envelope of Gram-positive bacteria. Applicants introduced a sortase deletion by co-transformation of a chloramphenicol-resistant targeting construct and a ⁇ srtA editing template ( FIG. 33 a,b ), followed by a AbgaA deletion using a kanamycin-resistant targeting construct that replaced the previous one. In S. pneumoniae , ⁇ -galactosidase is covalently linked to the cell wall by sortase.
  • deletion of srtA results in the release of the surface protein into the supernatant, whereas the double deletion has no detectable ⁇ -galactosidase activity ( FIG. 34 c ).
  • Such a sequential selection can be iterated as many times as required to generate multiple mutations.
  • JEN53 was transformed with an editing template that restores the wild-type allele, together with either a kanamycin-resistant CRISPR construct targeting the ermAM(stop) allele (CRISPR::ermAM(stop)) or a control construct without a spacer (CRISPR:: ⁇ ) ( FIG. 26 a,b ).
  • CRISPR::ermAM(stop) CRISPR::ermAM(stop)
  • CRISPR:: ⁇ spacer
  • Applicants compared the kanamycin-resistant colony forming units (cfu) obtained after co-transformation of JEN53 cells with the CRISPR::ermAM(stop) or CRISPR:: ⁇ constructs.
  • This background frequency may be calculated as the ratio of CRISPR::ermAM(stop)/CRISPR:: ⁇ cfu, 2.6 ⁇ 10 ⁇ 3 (7.1 ⁇ 10 1 /2.7 ⁇ 10 4 ) in this experiment, meaning that if the recombination frequency of the editing template is less than this value, CRISPR selection may not efficiently recover the desired mutants above the background.
  • Applicants sought to introduce an A to C transversion in the rpsL gene that confers streptomycin resistance.
  • Applicants constructed a pCRISPR::rpsL plasmid harboring a spacer that would guide Cas9 cleavage of the wild-type, but not the mutant rpsL allele ( FIG. 27 b ).
  • the pCas9 plasmid was first introduced into E. coli MG1655 and the resulting strain was co-transformed with the pCRISPR::rpsL plasmid and W542, an editing oligonucleotide containing the A to C mutation.
  • Applicants applied their CRISPR system with recombineering, using Cas9-induced cell death to select for the desired mutations.
  • the pCas9 plasmid was introduced into the recombineering strain HME63 (31), which contains the Gam, Exo and Beta functions of the ⁇ -red phage.
  • the resulting strain was co-transformed with the pCRISPR::rpsL plasmid (or a pCRISPR:: ⁇ control) and the W542 oligonucleotide ( FIG. 27 a ).
  • CRISPR-Cas systems may be used for targeted genome editing in bacteria by the co-introduction of a targeting construct that killed wild-type cells and an editing template that both eliminated CRISPR cleavage and introduced the desired mutations.
  • Different types of mutations insertions, deletions or scar-less single-nucleotide substitutions
  • Multiple mutations may be introduced at the same time.
  • the specificity and versatility of editing using the CRISPR system relied on several unique properties of the Cas9 endonuclease: (i) its target specificity may be programmed with a small RNA, without the need for enzyme engineering, (ii) target specificity was very high, determined by a 20 bp RNA-DNA interaction with low probability of non-target recognition, (iii) almost any sequence may be targeted, the only requirement being the presence of an adjacent NGG sequence, (iv) almost any mutation in the NGG sequence, as well as mutations in the seed sequence of the protospacer, eliminates targeting.
  • S. pneumoniae strain R6 was provided by Dr. Alexander Tomasz. Strain crR6 was generated in a previous study. Liquid cultures of S. pneumoniae were grown in THYE medium (30 g/l Todd-Hewitt agar, 5 g/l yeast extract). Cells were plated on tryptic soy agar (TSA) supplemented with 5% defibrinated sheep blood. When appropriate, antibiotics were added as followings: kanamycin (400 ⁇ g/ml), chloramphenicol (5 ⁇ g/ml), erythromycin (1 ⁇ g/ml) streptomycin (100 ⁇ g/ml) or spectinomycin (100 ⁇ g/ml). Measurements of ⁇ -galactosidase activity were made using the Miller assay as previously described.
  • E. coli strains MG1655 and HME63 (derived from MG1655, ⁇ (argF-lac) U169 ⁇ cI857 ⁇ cro-bioA galK tyr 145 UAG mutS amp) (31) were provided by Jeff Roberts and Donald Court, respectively. Liquid cultures of E. coli were grown in LB medium (Difco). When appropriate, antibiotics were added as followings: chloramphenicol (25 ⁇ g/ml), kanamycin (25 ⁇ g/ml) and streptomycin (50 ⁇ g/ml).
  • Competent cells were prepared as described previously (23). For all genome editing transformations, cells were gently thawed on ice and resuspended in 10 volumes of M2 medium supplemented with 100 ng/ml of competence-stimulating peptide CSP1(40), and followed by addition of editing constructs (editing constructs were added to cells at a final concentration between 0.7 ng/gl to 2.5 ⁇ g/ul). Cells were incubated 20 min at 37° C. before the addition of 2 ⁇ l of targeting constructs and then incubated 40 min at 37° C. Serial dilutions of cells were plated on the appropriate medium to determine the colony forming units (cfu) count.
  • E. coli Lambda-Red Recombineering E. coli Lambda-Red Recombineering.
  • Strain HME63 was used for all recombineering experiments.
  • Recombineering cells were prepared and handled according to a previously published protocol (6). Briefly, a 2 ml overnight culture (LB medium) inoculated from a single colony obtained from a plate was grown at 30° C. The overnight culture was diluted 100-fold and grown at 30° C. with shaking (200 rpm) until the OD 600 is from 0.4-0.5 (approximately 3 hrs). For Lambda-red induction, the culture was transferred to a 42° C. water bath to shake at 200 rpm for 15 min.
  • the culture was swirled in an ice-water slurry and chilled on ice for 5-10 min. Cells were then washed and aliquoted according to the protocol.
  • 50 ⁇ l of cells were mixed with 1 mM of salt-free oligos (IDT) or 100-150 ng of plasmid DNA (prepared by QIAprep Spin Miniprep Kit, Qiagen). Cells were electroporated using 1 mm Gene Pulser cuvette (Bio-rad) at 1.8 kV and were immediately resuspended in 1 ml of room temperature LB medium. Cells were recovered at 30° C. for 1-2 hrs before being plated on LB agar with appropriate antibiotic resistance and incubated at 32° C. overnight.
  • S. pneumoniae genomic DNA was extracted using the Wizard Genomic DNA Purification Kit, following instructions provided by the manufacturer (Promega).
  • genotyping purposes 700 ul of overnight S. pneumoniae cultures were pelleted, resuspended in 60 ul of lysozyme solution (2 mg/ml) and incubated 30 min at 37° C.
  • the genomic DNA was extracted using QIAprep Spin Miniprep Kit (Qiagen).
  • the resulting PCR product was transformed into competent S. pneumoniae crR6 cells and chloramphenicol-resistant transformants were selected.
  • S. pneumoniae crR6M S. pneumoniae crR6 genomic DNA was amplified by PCR using primers L409/L488 and L448/L481, respectively. Each PCR product was gel-purified and they were fused by SOEing PCR with primers L409/L481.
  • the resulting PCR product was transformed into competent S. pneumoniae LAM226 cells and kanamycin-resistant transformants were selected.
  • S. pneumoniae crR6M genomic DNA was amplified by PCR using primers L430/W286, and S. pneumoniae LAM226 genomic DNA was amplified by PCR using primers W288/L481. Each PCR product was gel-purified and they were fused by SOEing PCR with primers L430/L481. The resulting PCR product was transformed into competent S. pneumoniae crR6M cells and chloramphenicol-resistant transformants were selected.
  • S. pneumoniae crR6M genomic DNA was amplified by PCR using primers L430/W286 and W287/L481, respectively. Each PCR product was gel-purified and they were fused by SOEing PCR with primers L430/L481. The resulting PCR product was transformed into competent S. pneumoniae crR6Rc cells and kanamycin-resistant transformants were selected.
  • S. pneumoniae crR6Rk genomic DNA was amplified by PCR using primers L430/W356 and W357/L481, respectively. Each PCR product was gel-purified and they were fused by SOEing PCR with primers L430/L481. The resulting PCR product was transformed into competent S. pneumoniae crR6Rc cells and kanamycin-resistant transformants were selected.
  • R6 genomic DNA was amplified using primers L422/L461 and L459/L426, respectively.
  • the ermAM gene (specifying erythromycin resistance) was amplified from plasmid pFW15 43 using primers L457/L458.
  • Each PCR product was gel-purified and all three were fused by SOEing PCR with primers L422/L426.
  • the resulting PCR product was transformed into competent S. pneumoniae crR6Rc cells and erythromycin-resistant transformants were selected.
  • JEN53 was generated in two steps. First JEN43 was constructed as illustrated in FIG. 33 . JEN53 was generated by transforming genomic DNA of JEN25 into competent JEN43 cells and selecting on both chloramphenicol and erythromycin.
  • S. pneumoniae crR6Rk genomic DNA was amplified by PCR using primers W256/W365 and W366/L403, respectively. Each PCR product was purified and ligated by Gibson assembly. The assembly product was transformed into competent S. pneumoniae crR6Rc cells and kanamycin-resistant transformants were selected.
  • pDB97 was constructed through phosphorylation and annealing of oligonucleotides B296/B297, followed by ligation in pLZ12spec digested by EcoRI/BamHI. Applicants fully sequenced pLZ12spec and deposited its sequence in genebank (accession: KC112384).
  • pDB98 was obtained after cloning the CRISPR leader sequence was cloned together with a repeat-spacer-repeat unit into pLZ12spec. This was achieved through amplification of crR6Rc DNA with primers B298/B320 and B299/B321, followed by SOEing PCR of both products and cloning in pLZ12spec with restriction sites BamHI/EcoRI. In this way the spacer sequence in pDB98 was engineered to contain two BsaI restriction sites in opposite directions that allow for the scar-less cloning of new spacers.
  • pDB99 to pDB108 were constructed by annealing of oligonucleotides B300/B301 (pDB99), B302/B303 (pDB100), B304/B305 (pDB101), B306/B307 (pDB102), B308/B309 (pDB103), B310/B311 (pDB104), B312/B313 (pDB105), B314/B315 (pDB106), B315/B317 (pDB 107), B318/B319 (pDB 108), followed by ligation in pDB98 cut by BsaI.
  • the pCas9 plasmid was constructed as follow.
  • Essential CRISPR elements were amplified from Streptococcos pyogenes SF370 genomic DNA with flanking homology arms for Gibson Assembly.
  • the tracrRNA and Cas9 were amplified with oligos HC008 and HC010.
  • the leader and CRISPR sequences were amplified HC011/HC014 and HC015/HC009, so that two BsaI type IIS sites were introduced in between two direct repeats to facilitate easy insertion of spacers.
  • pCRISPR was constructed by subcloning the pCas9 CRISPR array in pZE21-MCS1 through amplification with oligos B298+B299 and restriction with EcoRI and BamHI.
  • the rpsL targeting spacer was cloned by annealing of oligos B352+B353 and cloning in the BsaI cut pCRISPR giving pCRISPR::rpsL.
  • Targeting constructs used for genome editing were made by Gibson assembly of Left PCRs and Right PCRs (Table G). Editing constructs were made by SOEing PCR fusing PCR products A (PCR A), PCR products B (PCR B) and PCR products C(PCR C) when applicable (Table G).
  • the CRISPR:: ⁇ and CRISPR::ermAM(stop) targeting constructs were generated by PCR amplification of JEN62 and crR6 genomic DNA respectively, with oligos L409 and L481.
  • the 5 nucleotides following the spacer 1 target were randomized through amplification of R6 8232.5 genomic DNA with primers W377/L426. This PCR product was then assembled with the cat gene and the srtA upstream region that were amplified from the same template with primers L422/W376. 80 ng of the assembled DNA was used to transform strains R6 and crR6. Samples for the randomized targets were prepared using the following primers: B280-B290/L426 to randomize bases 1-10 of the target and B269-B278/L426 to randomize bases 10-20.
  • Primers L422/B268 and L422/B279 were used to amplify the cat gene and srtA upstream region to be assembled with the first and last 10 PCR products respectively.
  • the assembled constructs were pooled together and 30 ng was transformed in R6 and crR6. After transformation, cells were plated on chloramphenicol selection. For each sample more than 2 ⁇ 10 5 cells were pooled together in 1 ml of THYE and genomic DNA was extracted with the Promega Wizard kit.
  • Primers B250/B251 were used to amplify the target region. PCR products were tagged and run on one Illumina MiSeq paired-end lane using 300 cycles.
  • Randomized PAM For the randomized PAM experiment 3,429,406 reads were obtained for crR6 and 3,253,998 for R6. It is expected that only half of them will correspond to the PAM-target while the other half will sequence the other end of the PCR product. 1,623,008 of the crR6 reads and 1,537,131 of the R6 reads carried an error-free target sequence. The occurrence of each possible PAM among these reads is shown in supplementary file. To estimate the functionality of a PAM, its relative proportion in the crR6 sample over the R6 sample was computed and is denoted r ijklm where I,j,k,l,m are one of the 4 possible bases. The following statistical model was constructed:
  • NGGNN patterns are significantly different from all other patterns and carry the strongest effect (see table below).
  • Model 1 ratio.log ⁇ 1
  • Model 2 ratio.log ⁇ b1 + b4 + b5 Res. Df RSS Df Sum of Sq F Pr(>F) 1 63 14.579 2 54 11.295 9 3.2836 1.7443 0.1013
  • NAGNN patterns are significantly different from all other patterns but carry a much smaller effect than NGGNN (see Tukey's honest significance test below).
  • NTGGN and NCGGN patterns are similar and show significantly more CRISPR interference than NTGHN and NCGHN patterns (where H is A,T or C), as shown by a bonferroni adjusted pairwise student-test.
  • NNGGN patterns in general produce either a complete interference in the case of NGGGN, or a partial interference in the case of NAGGN, NTGGN or NCGGN.
  • FIG. 24 c shows a histogram of the data density with fitted normal distribution (black line) and 0.99 quantile (dotted line).
  • Applicants mutated the tracrRNA and direct repeat sequences, or mutated the chimeric guide RNA to enhance the RNAs in cells.
  • Optimized tracrRNA and corresponding optimized direct repeat are presented in pairs.
  • Optimized tracrRNA 1 (mutation underlined): (SEQ ID NO: 187) GGAACCATTCA t AACAGCATAGCAAGTTA t AATAAGGCTAGTCCGTTAT CAACTTGAAAAAGTGGCACCGAGTCGGTGCTTTTT Optimized direct repeat 1 (mutation underlined): (SEQ ID NO: 188) GTT a TAGAGCTATGCTGTT a TGAATGGTCCCAAAAC
  • Optimized tracrRNA 2 (mutation underlined): (SEQ ID NO: 189) GGAACCATTCAA t ACAGCATAGCAAGTTAA t ATAAGGCTAGTCCGTTAT CAACTTGAAAAAGTGGCACCGAGTCGGTGCTTTTT Optimized direct repeat 2 (mutation underlined): (SEQ ID NO: 190) GT a TTAGAGCTATGCTGT a TTGAATGGTCCCAAAAC
  • Applicants also optimized the chimeric guideRNA for optimal activity in eukaryotic cells.
  • the experiment was conducted by co-transfecting 293FT cells with Cas9 and a U6-guide RNA DNA cassette to express one of the four RNA forms shown above.
  • the target of the guide RNA is the same target site in the human Emxl locus: “GTCACCTCCAATGACTAGGG (SEQ ID NO: 195)”
  • the StlCas9 guide RNAs can undergo the same type of optimization as for SpCas9 guide RNAs, by breaking the stretches of poly thymines (Ts)
  • the CRISPR-Cas system is an adaptive immune mechanism against invading exogenous DNA employed by diverse species across bacteria and archaea.
  • the type II CRISPR-Cas9 system consists of a set of genes encoding proteins responsible for the “acquisition” of foreign DNA into the CRISPR locus, as well as a set of genes encoding the “execution” of the DNA cleavage mechanism; these include the DNA nuclease (Cas9), a non-coding transactivating cr-RNA (tracrRNA), and an array of foreign DNA-derived spacers flanked by direct repeats (crRNAs).
  • the tracRNA and crRNA duplex guide the Cas9 nuclease to a target DNA sequence specified by the spacer guide sequences, and mediates double-stranded breaks in the DNA near a short sequence motif in the target DNA that is required for cleavage and specific to each CRISPR-Cas system.
  • the type II CRISPR-Cas systems are found throughout the bacterial kingdom and highly diverse in in Cas9 protein sequence and size, tracrRNA and crRNA direct repeat sequence, genome organization of these elements, and the motif requirement for target cleavage.
  • One species may have multiple distinct CRISPR-Cas systems.
  • Applicants show that the following mutations can convert SpCas9 into a nicking enzyme: D10A, E762A, H840A, N854A, N863A, D986A.
  • Applicants provide sequences showing where the mutation points are located within the SpCas9 gene ( FIG. 41 ). Applicants also show that the nickases are still able to mediate homologous recombination (Assay indicated in FIG. 2 ). Furthermore, Applicants show that SpCas9 with these mutations (individually) do not induce double strand break ( FIG. 47 ).
  • HEK cell line 293FT Human embryonic kidney (HEK) cell line 293FT (Life Technologies) was maintained in Dulbecco's modified Eagle's Medium (DMEM) supplemented with 10% fetal bovine serum (HyClone), 2 mM GlutaMAX (Life Technologies), 100 U/mL penicillin, and 100 ⁇ g/mL streptomycin at 37° C. with 5% CO2 incubation.
  • DMEM Dulbecco's modified Eagle's Medium
  • HyClone fetal bovine serum
  • 2 mM GlutaMAX 100 U/mL penicillin
  • streptomycin 100 ⁇ g/mL streptomycin at 37° C. with 5% CO2 incubation.
  • 293FT cells were seeded either onto 6-well plates, 24-well plates, or 96-well plates (Corning) 24 hours prior to transfection.
  • Cells were transfected using Lipofectamine 2000 (Life Technologies) at 80-90% confluence following the manufacturer's recommended protocol.
  • a total of 1 ug of Cas9+sgRNA plasmid was used.
  • a total of 500 ng Cas9+sgRNA plasmid was used unless otherwise indicated.
  • 65 ng of Cas9 plasmid was used at a 1:1 molar ratio to the U6-sgRNA PCR product.
  • Human embryonic stem cell line HUES9 Human embryonic stem cell line HUES9 (Harvard Stem Cell Institute core) was maintained in feeder-free conditions on GelTrex (Life Technologies) in mTesR medium (Stemcell Technologies) supplemented with 100 ug/ml Normocin (InvivoGen). HUES9 cells were transfected with Amaxa P3 Primary Cell 4-D Nucleofector Kit (Lonza) following the manufacturer's protocol.
  • 293FT cells were transfected with plasmid DNA as described above. Cells were incubated at 37° C. for 72 hours post-transfection prior to genomic DNA extraction. Genomic DNA was extracted using the QuickExtract DNA Extraction Solution (Epicentre) following the manufacturer's protocol. Briefly, pelleted cells were resuspended in QuickExtract solution and incubated at 65° C. for 15 minutes and 98° C. for 10 minutes.
  • the genomic region flanking the CRISPR target site for each gene was PCR amplified (primers listed in Tables J and K), and products were purified using QiaQuick Spin Column (Qiagen) following the manufacturer's protocol. 400 ng total of the purified PCR products were mixed with 2 ⁇ l 10 ⁇ Taq DNA Polymerase PCR buffer (Enzymatics) and ultrapure water to a final volume of 20 ⁇ l, and subjected to a re-annealing process to enable heteroduplex formation: 95° C. for 10 min, 95° C. to 85° C. ramping at ⁇ 2° C./s, 85° C. to 25° C. at ⁇ 0.25° C./s, and 25° C. hold for 1 minute.
  • RNA samples were heated to 95° C. for 5 min before loading on 8% denaturing polyacrylamide gels (SequaGel, National Diagnostics). Afterwards, RNA was transferred to a pre-hybridized Hybond N+membrane (GE Healthcare) and crosslinked with Stratagene UV Crosslinker (Stratagene). Probes were labeled with [gamma-32P] ATP (Perkin Elmer) with T4 polynucleotide kinase (New England Biolabs). After washing, membrane was exposed to phosphor screen for one hour and scanned with phosphorimager (Typhoon).
  • HEK 293FT cells were transfected with Cas9 as described above. Genomic DNA was isolated with the DNeasy Blood & Tissue Kit (Qiagen) and bisulfite converted with EZ DNA Methylation-Lightning Kit (Zymo Research). Bisulfite PCR was conducted using KAPA2G Robust HotStart DNA Polymerase (KAPA Biosystems) with primers designed using the Bisulfite Primer Seeker (Zymo Research, Tables J and K). Resulting PCR amplicons were gel-purified, digested with EcoRI and HindIII, and ligated into a pUC19 backbone prior to transformation. Individual clones were then Sanger sequenced to assess DNA methylation status.
  • HEK 293FT cells were transfected with Cas9 as described above. Whole cell lysates were then prepared with a lysis buffer (20 mM HEPES, 100 mM KCl, 5 mM MgCl2, 1 mM DTT, 5% glycerol, 0.1% Triton X-100) supplemented with Protease Inhibitor Cocktail (Roche). T7-driven sgRNA was in vitro transcribed using custom oligos (Example 10) and HiScribe T7 In Vitro Transcription Kit (NEB), following the manufacturer's recommended protocol. To prepare methylated target sites, pUC19 plasmid was methylated by M.SssI and then linearized by NheI.
  • the in vitro cleavage assay was performed as follows: for a 20 uL cleavage reaction, 10 uL of cell lysate with incubated with 2 uL cleavage buffer (100 mM HEPES, 500 mM KCl, 25 mM MgCl2, 5 mM DTT, 25% glycerol), the in vitro transcribed RNA, and 300 ng pUC19 plasmid DNA.
  • 2 cleavage buffer 100 mM HEPES, 500 mM KCl, 25 mM MgCl2, 5 mM DTT, 25% glycerol
  • HEK 293FT cells plated in 96-well plates were transfected with Cas9 plasmid DNA and single guide RNA (sgRNA) PCR cassette 72 hours prior to genomic DNA extraction ( FIG. 72 ).
  • the genomic region flanking the CRISPR target site for each gene was amplified ( FIG. 74 , FIG. 80 , (Example 10) by a fusion PCR method to attach the Illumina P5 adapters as well as unique sample-specific barcodes to the target amplicons (schematic described in FIG. 73 ).
  • PCR products were purified using EconoSpin 96-well Filter Plates (Epoch Life Sciences) following the manufacturer's recommended protocol.
  • MiSeq reads were filtered by requiring an average Phred quality (Q score) of at least 23, as well as perfect sequence matches to barcodes and amplicon forward primers.
  • Reads from on- and off-target loci were analyzed by first performing Smith-Waterman alignments against amplicon sequences that included 50 nucleotides upstream and downstream of the target site (a total of 120 bp). Alignments, meanwhile, were analyzed for indels from 5 nucleotides upstream to 5 nucleotides downstream of the target site (a total of 30 bp). Analyzed target regions were discarded if part of their alignment fell outside the MiSeq read itself, or if matched base-pairs comprised less than 85% of their total length.
  • Negative controls for each sample provided a gauge for the inclusion or exclusion of indels as putative cutting events.
  • an indel was counted only if its quality score exceeded ⁇ , where ⁇ was the mean quality-score of the negative control corresponding to that sample and ⁇ was the standard deviation of same. This yielded whole target-region indel rates for both negative controls and their corresponding samples.
  • q per-target-region-per-read error rate
  • n the sample's observed indel count n
  • R read-count R
  • a maximum-likelihood estimate for the fraction of reads having target-regions with true-indels, P was derived by applying a binomial error model, as follows.
  • p ) ( R ⁇ ( 1 - p ) n - Rp ) ⁇ q n - Rp ⁇ ( 1 - q ) R - n
  • Wilson score intervals (2) were calculated for each sample, given the MLE-estimate for true-indel target-regions, Rp, and the number of reads R. Explicitly, the lower bound l and upper bound u were calculated as
  • 293FT cells plated in 24-well plates were transfected as described above. 72 hours post-transfection, total RNA was harvested with miRNeasy Micro Kit (Qiagen). Reverse-strand synthesis for sgRNAs was performed with qScript Flex cDNA kit (VWR) and custom first-strand synthesis primers (Tables J and K). qPCR analysis was performed with Fast SYBR Green Master Mix (Life Technologies) and custom primers (Tables J and K), using GAPDH as an endogenous control. Relative quantification was calculated by the ⁇ CT method.
  • Target site sequences Tested target sites for S. pyogenes type II CRISPR system with the requisite PAM. Cells were transfected with Cas9 and either crRNA-tracrRNA or chimeric sgRNA for each target.
  • Target site genomic ID target Target site sequence PAM strand 1 EMX1 GTCACCTCCAATGACTAGGG (SEQ ID TGG + NO: 319) 2 EMX1 GACATCGATGTCCTCCCCAT (SEQ ID TGG ⁇ NO: 196) 3 EMX1 GAGTCCGAGCAGAAGAAGAA (SEQ GGG + ID NO: 197) 6 EMX1 GCGCCACCGGTTGATGTGAT (SEQ ID GGG ⁇ NO: 198) 10 EMX1 GGGGCACAGATGAGAAACTC (SEQ ID AGG ⁇ NO: 199) 11 EMX1 GTACAAACGGCAGAAGCTGG (SEQ ID AGG + NO: 200) 12 EMX1 GGCAGAAGCTGGAGGAGGAA (SEQ GGG + ID NO: 201) 13 EMX1 GGAGCCCTTCTTCTTCTGCT (SEQ ID CGG ⁇ NO: 202) 14 EMX1 GGGCAACCACAAACCCACGA (SEQ ID GGG +
  • primer name primer sequence (5′ to 3′) U6-Forward GCCTCTA GAGGTACCTGAGGGCCTATTTCCCATGATTCC (SEQ ID NO: 229) I: sgRNA(DR +12, ACCTCTAG AAAAAAAGCACCGACTCGGTGCCACTTTTTCAAGT tracrRNA +85) TGATAACGGACTAGCCTTATTTTAACTTGCTATTTC TAGCTCT AAAAC NNNNNNNNNNNNNNNNNN GGTGTTTCGTCCTTTCC ACAAG (SEQ ID NO: 230) II: sgRNA(DR +12, ACCTCTAG AAAAAAAGCACCGACTCGGTGCCACTTTTTCAAGT tracrRNA +85) TGATAACGGACTAGCCTTATATTAACTTGCTATTTC TAGCTCT mut2 AATAC NNNNNNNNNNNNNN GGTGTTTCGTCCTTTCCA CAAG (SEQ ID NO: 231) III: sgRNA(DR +22, ACCTCTAG AAAAAAAAAAAAA
  • Target site sequence (5′ to 3′) PAM AGGCCCCAGTGGCTGCTCT (SEQ ID NO: 234) NAA ACATCAACCGGTGGCGCAT (SEQ ID NO: 235) NAT AAGGTGTGGTTCCAGAACC (SEQ ID NO: 236) NAC CCATCACATCAACCGGTGG (SEQ ID NO: 237) NAG AAACGGCAGAAGCTGGAGG (SEQ ID NO: 238) NTA GGCAGAAGCTGGAGGAGGA (SEQ ID NO: 239) NTT GGTGTGGTTCCAGAACCGG (SEQ ID NO: 240) NTC AACCGGAGGACAAAGTACA (SEQ ID NO: 241) NTG TTCCAGAACCGGAGGACAA (SEQ ID NO: 242) NCA GTGTGGTTCCAGAACCGGA (SEQ ID NO: 243) NCT TCCAGAACC
  • the oligo homologous recombination test is a comparison of efficiency across different Cas9 variants and different HR template (oligo vs. plasmid).
  • SpCas9 Wildtype Cas9
  • SpCas9n nickase Cas9 (D10A).
  • the chimeric RNA target is the same EMX1 Protospacer Target 1 as in Examples 5, 9 and 10 and oligos synthesized by IDT using PAGE purification.
  • FIG. 44 depicts a design of the oligo DNA used as Homologous Recombination (HR) template in this experiment.
  • Long oligos contain 100 bp homology to the EMX1 locus and a HindIII restriction site.
  • 293FT cells were co-transfected with: first, a plasmid containing a chimeric RNA targeting human EMX1 locus and wild-type cas9 protein, and second, the oligo DNA as HR template. Samples are from 293FT cells collected 96 hours post transfection with Lipofectamine 2000. All products were amplified with an EMX1 HR Primer, gel purified, followed by digestion with HindIII to detect the efficiency of integration of HR template into the human genome.
  • FIGS. 45 and 46 depict a comparison of HR efficiency induced by different combination of Cas9 protein and HR template.
  • the Cas9 construct used were either wild-type Cas9 or the nickase version of Cas9 (Cas9n).
  • the HR template used were: antisense oligo DNA (Antisense-Oligo in above figure), or sense oligo DNA (Sense-Oligo in above figure), or plasmid HR template (HR template in above figure).
  • the sense/anti-sense definition is that the actively-transcribed strand with sequence corresponding to the transcribed mRNA is defined as the sense strand of genome.
  • HR Efficiency is shown as percentage of HindIII digestion band as against all genomic PCR amplified product (bottom numbers).
  • Chromodomain helicase DNA binding protein 8 (CHD8) is a pivotal gene in involved in early vertebrate development and morphogenesis. Mice lacking CHD8 die during embryonic development. Mutations in the CHD8 gene have been associated with autism spectrum disorder in humans. This association was made in three different papers published simultaneously in Nature. The same three studies identified a plethora of genes associated with autism spectrum disorder. Applicants' aim was to create knockout mice for the four genes that were found in all papers, Chd8, Katna12, Kctd13, and Scn2a. In addition, Applicants chose two other genes associated with autism spectrum disorder, schizophrenia, and ADHD, GIT1, CACNA1C, and CACNB2. And finally, as a positive control Applicants decide to target MeCP2.
  • a knockout would occur after the hSpCas9 nuclease makes a double strand break and the error prone DNA repair pathway, non-homologous end joining, corrects the break, creating a mutation. The most likely result is a frameshift mutation that would knockout the gene.
  • the targeting strategy involved finding proto-spacers in the exons of the gene that had a PAM sequence, NGG, and was unique in the genome. Preference was given to proto-spacers in the first exon, which would be most deleterious to the gene.
  • Each gRNA was validated in the mouse cell line, Neuro-N2a, by liposomal transient co-transfection with hSpCas9. 72 hours post-transfection genomic DNA was purified using QuickExtract DNA from Epicentre. PCR was performed to amplify the locus of interest. Subsequently the SURVEYOR Mutation Detection Kit from Transgenomics was followed. The SURVEYOR results for each gRNA and respective controls are shown in Figure A 1 . A positive SURVEYOR result is one large band corresponding to the genomic PCR and two smaller bands that are the product of the SURVEYOR nuclease making a double-strand break at the site of a mutation. The average cutting efficiency of each gRNA was also determined for each gRNA. The gRNA that was chosen for injection was the highest efficiency gRNA that was the most unique within the genome.
  • RNA (hSpCas9+gRNA RNA) was injected into the pronucleus of a zygote and later transplanted into a foster mother. Mothers were allowed to go full term and pups were sampled by tail snip 10 days postnatal. DNA was extracted and used as a template for PCR, which was then processed by SURVEYOR. Additionally, PCR products were sent for sequencing. Animals that were detected as being positive in either the SURVEYOR assay or PCR sequencing would have their genomic PCR products cloned into a pUC 19 vector and sequenced to determine putative mutations from each allele.
  • mice pups from the Chd8 targeting experiment have been fully processed up to the point of allele sequencing.
  • the Surveyor results for 38 live pups (lanes 1-38) 1 dead pup (lane 39) and 1 wild-type pup for comparison (lane 40) are shown in Figure A 2 .
  • Pups 1-19 were injected with gRNA Chd8.2 and pups 20-38 were injected with gRNA Chd8.3.
  • 13 were positive for a mutation.
  • the one dead pup also had a mutation.
  • Genomic PCR sequencing was consistent with the SURVEYOR assay findings.
  • FIG. 67 depicts a design of the CRISPR-TF (Transcription Factor) with transcriptional activation activity.
  • the chimeric RNA is expressed by U6 promoter, while a human-codon-optimized, double-mutant version of the Cas9 protein (hSpCas9m), operably linked to triple NLS and a VP64 functional domain is expressed by a EF1a promoter.
  • the double mutations, D10A and H840A renders the cas9 protein unable to introduce any cleavage but maintained its capacity to bind to target DNA when guided by the chimeric RNA.
  • FIG. 68 depicts transcriptional activation of the human SOX2 gene with CRISPR-TF system (Chimeric RNA and the Cas9-NLS-VP64 fusion protein).
  • 293FT cells were transfected with plasmids bearing two components: (1) U6-driven different chimeric RNAs targeting 20-bp sequences within or around the human SOX2 genomic locus, and (2) EF1a-driven hSpCas9m (double mutant)-NLS-VP64 fusion protein. 96 hours post transfection, 293FT cells were harvested and the level of activation is measured by the induction of mRNA expression using a qRT-PCR assay.
  • 293FT cells were transfected with plasmid containing two components: (1) EF1a promoter driving the expression of Cas9 (wild-type human-codon-optimized Sp Cas9) with different NLS designs (2) U6 promoter driving the same chimeric RNA targeting human EMX1 locus.
  • Genomic PCR product were re-anneal and subjected to the Surveyor assay following manufacturer's protocol. The genomic cleavage efficiency of different constructs were measured using SDS-PAGE on a 4-12% TBE-PAGE gel (Life Technologies), analyzed and quantified with ImageLab (Bio-rad) software, all following manufacturer's protocol.
  • FIG. 69 depicts a design of different Cas9 NLS constructs. All Cas9 were the human-codon-optimized version of the Sp Cas9. NLS sequences are linked to the cas9 gene at either N-terminus or C-terminus. All Cas9 variants with different NLS designs were cloned into a backbone vector containing so it is driven by EF1a promoter. On the same vector there is a chimeric RNA targeting human EMX1 locus driven by U6 promoter, together forming a two-component system.
  • FIG. 70 depicts the efficiency of genomic cleavage induced by Cas9 variants bearing different NLS designs. The percentage indicate the portion of human EMX1 genomic DNA that were cleaved by each construct. All experiments are from 3 biological replicates. n 3, error indicates S.E.M.
  • Method 1 Applicants deliver Cas9 and guide RNA using a vector that expresses Cas9 under the control of a constitutive promoter such as Hsp70A-Rbc S2 or Beta2-tubulin.
  • a constitutive promoter such as Hsp70A-Rbc S2 or Beta2-tubulin.
  • Method 2 Applicants deliver Cas9 and T7 polymerase using vectors that expresses Cas9 and T7 polymerase under the control of a constitutive promoter such as Hsp70A-Rbc S2 or Beta2-tubulin.
  • Guide RNA will be delivered using a vector containing T7 promoter driving the guide RNA.
  • Method 3 Applicants deliver Cas9 mRNA and in vitro transcribed guide RNA to algae cells.
  • RNA can be in vitro transcribed.
  • Cas9 mRNA will consist of the coding region for Cas9 as well as 3′UTR from Cop1 to ensure stabilization of the Cas9 mRNA.
  • Applicants provide an additional homology directed repair template.
  • T7 promoter T7 promoter, Ns represent targeting sequence
  • Chlamydomonas reinhardtii strain CC-124 and CC-125 from the Chlamydomonas Resource Center will be used for electroporation. Electroporation protocol follows standard recommended protocol from the GeneArt Chlamydomonas Engineering kit.
  • Applicants generate a line of Chlamydomonas reinhardtii that expresses Cas9 constitutively. This can be done by using pChlamy1 (linearized using PvuI) and selecting for hygromycin resistant colonies. Sequence for pChlamy1 containing Cas9 is below. In this way to achieve gene knockout one simply needs to deliver RNA for the guideRNA. For homologous recombination Applicants deliver guideRNA as well as a linearized homologous recombination template.
  • RNA-guided Cas9 protein as a programmable transcriptional repressor.
  • Applicants have previously demonstrated how the Cas9 protein of Streptococcus pyogenes SF370 can be used to direct genome editing in Streptococcus pneumoniae .
  • Applicants engineered the crR6Rk strain containing a minimal CRISPR system, consisting of cas9, the tracrRNA and a repeat. The D10A-H840 mutations were introduced into cas9 in this strain, giving strain crR6Rk**.
  • Four spacers targeting different positions of the bgaA ⁇ -galactosidase gene promoter were cloned in the CRISPR array carried by the previously described pDB98 plasmid.
  • Applicants observed a X to Y fold reduction in ⁇ -galactosidase activity depending on the targeted position, demonstrating the potential of Cas9 as a programmable repressor ( FIG. 73 ).
  • GFP green fluorescence protein
  • pDB127 green fluorescence protein reporter plasimd
  • the promoter was designed to carry several NPP PAMs on both strands, to measure the effect of Cas9** binding at various positions.
  • Applicants introduced the D10A-H840 mutations into pCas9, a plasmid described carrying the tracrRNA, cas9 and a minimal CRISPR array designed for the easy cloning of new spacers. Twenty-two different spacers were designed to target different regions of the gfpmut2 promoter and open reading frame.
  • RNA from strains carrying either the T5, T10, B 10 or a control construct that does not target pDB127 and subjected it to Northern blot analysis using either a probe binding before (B477) or after (B510) the B10 and T10 target sites. Consistent with Applicants' fluorescence methods, no gfpmut2 transcription was detected when Cas9** was directed to the promoter region (T5 target) and a transcription was observed after the targeting of the T10 region. Interestingly, a smaller transcript was observed with the B477 probe.
  • This band corresponds to the expected size of a transcript that would be interrupted by Cas9**, and is a direct indication of a transcriptional termination caused by dgRNA::Cas9** binding to the coding strand.
  • dgRNA::Cas9** binding to the coding strand Surprisingly, Applicants detected no transcript when the non-coding strand was targeted (B10). Since Cas9** binding to the B 10 region is unlikely to interfere with transcription initiation, this result suggests that the mRNA was degraded.
  • DgRNA::Cas9 was shown to bind ssRNA in vitro. Applicants speculate that binding may trigger degradation of the mRNA by host nucleases. Indeed, ribosome stalling can induce cleavage on the translated mRNA in E. coli.
  • a vector system comprising one or more vectors, wherein the system comprises
  • a second regulatory element operably linked to an enzyme-coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence
  • components (a) and (b) are located on the same or different vectors of the system.
  • component (a) further comprises the traer sequence downstream of the traer mate sequence under the control of the first regulatory element.
  • component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein when expressed, each of the two or more guide sequences direct sequence specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell.
  • a vector comprising a regulatory element operably linked to an enzyme-coding sequence encoding a CRISPR enzyme comprising one or more nuclear localization sequences, wherein said regulatory element drives transcription of the CRISPR enzyme in a eukaryotic cell such that said CRISPR enzyme accumulates in a detectable amount in the nucleus of the eukaryotic cell.
  • a CRISPR enzyme comprising one or more nuclear localization sequences of sufficient strength to drive accumulation of said CRISPR enzyme in a detectable amount in the nucleus of a eukaryotic cell.
  • a eukaryotic host cell comprising:
  • a second regulatory element operably linked to an enzyme-coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence.
  • component (a) further comprises the traer sequence downstream of the traer mate sequence under the control of the first regulatory element.
  • component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein when expressed, each of the two or more guide sequences direct sequence specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell.
  • a non-human animal comprising a eukaryotic host cell of any one of paragraphs 26-43.
  • kits comprising a vector system and instructions for using said kit, the vector system comprising:
  • a second regulatory element operably linked to an enzyme-coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence.
  • kit comprising components (a) and (b) located on the same or different vectors of the system.
  • component (a) further comprises the traer sequence downstream of the traer mate sequence under the control of the first regulatory element.
  • component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein when expressed, each of the two or more guide sequences direct sequence specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell.
  • kit of paragraph 45 wherein the system comprises the traer sequence under the control of a third regulatory element.
  • kits of paragraph 45 wherein the traer sequence exhibits at least 50% of sequence complementarity along the length of the traer mate sequence when optimally aligned.
  • kits of paragraph 45 wherein the CRISPR enzyme comprises one or more nuclear localization sequences of sufficient strength to drive accumulation of said CRISPR enzyme in a detectable mount in the nucleus of a eukaryotic cell.
  • kit of paragraph 45 wherein fewer than 50% of the nucleotides of the guide sequence participate in self-complementary base-pairing when optimally folded.
  • a computer system for selecting a candidate target sequence within a nucleic acid sequence in a eukaryotic cell for targeting by a CRISPR complex comprising:
  • a memory unit configured to receive and/or store said nucleic acid sequence
  • processors alone or in combination programmed to (i) locate a CRISPR motif sequence within said nucleic acid sequence, and (ii) select a sequence adjacent to said located CRISPR motif sequence as the candidate target sequence to which the CRISPR complex binds.
  • nucleotide at the 3′ end of the candidate target sequence is located no more than about 10 nucleotides upstream of the CRISPR motif sequence.
  • nucleic acid sequence in the eukaryotic cell is exogenous to the eukaryotic genome.
  • a computer-readable medium comprising codes that, upon execution by one or more processors, implements a method of selecting a candidate target sequence within a nucleic acid sequence in a eukaryotic cell for targeting by a CRISPR complex, said method comprising:
  • a method of modifying a target polynucleotide in a eukaryotic cell comprising allowing a CRISPR complex to bind to the target polynucleotide to effect cleavage of said target polynucleotide thereby modifying the target polynucleotide, wherein the CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence hybridized to a target sequence within said target polynucleotide, wherein said guide sequence is linked to a traer mate sequence which in turn hybridizes to a traer sequence.
  • a method of modifying expression of a polynucleotide in a eukaryotic cell comprising: allowing a CRISPR complex to bind to the polynucleotide such that said binding results in increased or decreased expression of said polynucleotide; wherein the CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence hybridized to a target sequence within said polynucleotide, wherein said guide sequence is linked to a traer mate sequence which in turn hybridizes to a traer sequence.
  • a method of generating a model eukaryotic cell comprising a mutated disease gene comprising:
  • a CRISPR complex to bind to a target polynucleotide to effect cleavage of the target polynucleotide within said disease gene, wherein the CRISPR complex comprises the CRISPR enzyme complexed with (1) the guide sequence that is hybridized to the target sequence within the target polynucleotide, and (2) the traer mate sequence that is hybridized to the traer sequence, thereby generating a model eukaryotic cell comprising a mutated disease gene.
  • a method of developing a biologically active agent that modulates a cell signaling event associated with a disease gene comprising:
  • a recombinant polynucleotide comprising a guide sequence upstream of a traer mate sequence, wherein the guide sequence when expressed directs sequence-specific binding of a CRISPR complex to a corresponding target sequence present in a eukaryotic cell.

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US14/105,035 US20140189896A1 (en) 2012-12-12 2013-12-12 Crispr-cas component systems, methods and compositions for sequence manipulation
US14/183,486 US8795965B2 (en) 2012-12-12 2014-02-18 CRISPR-Cas component systems, methods and compositions for sequence manipulation
US14/259,420 US8871445B2 (en) 2012-12-12 2014-04-23 CRISPR-Cas component systems, methods and compositions for sequence manipulation
US15/230,161 US20180327756A1 (en) 2012-12-12 2016-08-05 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/967,495 US20190017058A1 (en) 2012-12-12 2018-04-30 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/967,510 US20190040399A1 (en) 2012-12-12 2018-04-30 Crispr-cas component systems, methods and compositions for sequence manipulation
US16/445,156 US20200032278A1 (en) 2012-12-12 2019-06-18 Crispr-cas component systems, methods and compositions for sequence manipulation
US16/445,150 US20200032277A1 (en) 2012-12-12 2019-06-18 Crispr-cas component systems, methods and compositions for sequence manipulation
US16/532,442 US20200063147A1 (en) 2012-12-12 2019-08-05 Crispr-cas component systems, methods and compositions for sequence manipulation
US16/535,043 US20200080094A1 (en) 2012-12-12 2019-08-07 Crispr-cas component systems, methods and compositions for sequence manipulation
US17/034,754 US20210079407A1 (en) 2012-12-12 2020-09-28 Crispr-cas component systems, methods and compositions for sequence manipulation
US18/109,550 US20240182913A1 (en) 2012-12-12 2023-02-14 Crispr-cas component systems, methods and compositions for sequence manipulation
US18/128,122 US20230340505A1 (en) 2012-12-12 2023-03-29 Crispr-cas component systems, methods and compositions for sequence manipulation
US18/134,317 US20230374527A1 (en) 2012-12-12 2023-04-13 Crispr-cas component systems, methods and compositions for sequence manipulation
US18/454,343 US20240117365A1 (en) 2012-12-12 2023-08-23 Crispr-cas component systems, methods and compositions for sequence manipulation
US19/028,841 US20250250578A1 (en) 2012-12-12 2025-01-17 Crispr-cas component systems, methods and compositions for sequence manipulation

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US15/230,161 Continuation US20180327756A1 (en) 2012-12-12 2016-08-05 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/967,510 Continuation US20190040399A1 (en) 2012-12-12 2018-04-30 Crispr-cas component systems, methods and compositions for sequence manipulation
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US14/259,420 Active US8871445B2 (en) 2012-12-12 2014-04-23 CRISPR-Cas component systems, methods and compositions for sequence manipulation
US14/497,627 Abandoned US20150031134A1 (en) 2012-12-12 2014-09-26 Crispr-cas component systems, methods and compositions for sequence manipulation
US14/523,799 Active US9840713B2 (en) 2012-12-12 2014-10-24 CRISPR-Cas component systems, methods and compositions for sequence manipulation
US14/990,444 Active US9822372B2 (en) 2012-12-12 2016-01-07 CRISPR-Cas component systems, methods and compositions for sequence manipulation
US14/991,083 Abandoned US20160115489A1 (en) 2012-12-12 2016-01-08 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/230,161 Pending US20180327756A1 (en) 2012-12-12 2016-08-05 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/838,064 Abandoned US20180305704A1 (en) 2012-12-12 2017-12-11 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/887,377 Abandoned US20180179547A1 (en) 2012-12-12 2018-02-02 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/967,510 Abandoned US20190040399A1 (en) 2012-12-12 2018-04-30 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/967,495 Pending US20190017058A1 (en) 2012-12-12 2018-04-30 Crispr-cas component systems, methods and compositions for sequence manipulation
US16/178,551 Abandoned US20190292550A1 (en) 2012-12-12 2018-11-01 Crispr-cas component systems, methods and compositions for sequence manipulation
US16/445,150 Abandoned US20200032277A1 (en) 2012-12-12 2019-06-18 Crispr-cas component systems, methods and compositions for sequence manipulation
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US16/906,580 Pending US20200318123A1 (en) 2012-12-12 2020-06-19 Crispr-cas component systems, methods and compositions for sequence manipulation
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US18/109,550 Pending US20240182913A1 (en) 2012-12-12 2023-02-14 Crispr-cas component systems, methods and compositions for sequence manipulation
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US14/497,627 Abandoned US20150031134A1 (en) 2012-12-12 2014-09-26 Crispr-cas component systems, methods and compositions for sequence manipulation
US14/523,799 Active US9840713B2 (en) 2012-12-12 2014-10-24 CRISPR-Cas component systems, methods and compositions for sequence manipulation
US14/990,444 Active US9822372B2 (en) 2012-12-12 2016-01-07 CRISPR-Cas component systems, methods and compositions for sequence manipulation
US14/991,083 Abandoned US20160115489A1 (en) 2012-12-12 2016-01-08 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/230,161 Pending US20180327756A1 (en) 2012-12-12 2016-08-05 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/838,064 Abandoned US20180305704A1 (en) 2012-12-12 2017-12-11 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/887,377 Abandoned US20180179547A1 (en) 2012-12-12 2018-02-02 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/967,510 Abandoned US20190040399A1 (en) 2012-12-12 2018-04-30 Crispr-cas component systems, methods and compositions for sequence manipulation
US15/967,495 Pending US20190017058A1 (en) 2012-12-12 2018-04-30 Crispr-cas component systems, methods and compositions for sequence manipulation
US16/178,551 Abandoned US20190292550A1 (en) 2012-12-12 2018-11-01 Crispr-cas component systems, methods and compositions for sequence manipulation
US16/445,150 Abandoned US20200032277A1 (en) 2012-12-12 2019-06-18 Crispr-cas component systems, methods and compositions for sequence manipulation
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US16/532,442 Pending US20200063147A1 (en) 2012-12-12 2019-08-05 Crispr-cas component systems, methods and compositions for sequence manipulation
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