CRISPR-based genome modification and regulation
First Claim
1. A method for modifying a chromosomal sequence in a eukaryotic cell, the method comprising:
- introducing into the eukaryotic cell(i) at least one RNA-guided endonuclease or nucleic acid encoding at least one RNA-guided endonuclease, wherein the at least one RNA-guided endonuclease is a clustered regularly interspersed short palindromic repeats (CRISPR)/CRISPR associated (Cas) (CRISPR-Cas) type II system protein,wherein the nucleic acid encoding the CRISPR-Cas type II system protein is codon optimized for expression in the eukaryotic cell,wherein the CRISPR-Cas type II system protein is a Streptococcus pyogenes Cas9 protein including at least one nuclear localization signal consisting of SEQ ID NO;
1 or SEQ ID NO;
2 covalently attached to the C-terminal amino acid of the Cas9 protein sequence; and
(ii) at least one engineered guide RNA or DNA encoding at least one engineered guide RNA, each guide RNA comprising(1) a first region at the 5′
end that base pairs with a target site in the chromosomal sequence, and(2) a second region that forms a secondary structure which interacts with the at least one RNA-guided endonuclease; and
, optionally,(iii) at least one donor polynucleotide;
whereby the at least one guide RNA guides the at least one RNA-guided endonuclease to the target site in the chromosomal sequence where the RNA-guided endonuclease introduces a double-stranded break, the target site in the chromosomal sequence is immediately followed by a protospacer adjacent motif (PAM), and repair of the double-stranded break by a DNA repair process leads to modification of the chromosomal sequence.
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Abstract
The present invention provides RNA-guided endonucleases, which are engineered for expression in eukaryotic cells or embryos, and methods of using the RNA-guided endonuclease for targeted genome modification in eukaryotic cells or embryos. Also provided are fusion proteins, wherein each fusion protein comprises a CRISPR/Cas-like protein or fragment thereof and an effector domain. The effector domain can be a cleavage domain, an epigenetic modification domain, a transcriptional activation domain, or a transcriptional repressor domain. Also provided are methods for using the fusion proteins to modify a chromosomal sequence or regulate expression of a chromosomal sequence.
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Citations
22 Claims
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1. A method for modifying a chromosomal sequence in a eukaryotic cell, the method comprising:
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introducing into the eukaryotic cell (i) at least one RNA-guided endonuclease or nucleic acid encoding at least one RNA-guided endonuclease, wherein the at least one RNA-guided endonuclease is a clustered regularly interspersed short palindromic repeats (CRISPR)/CRISPR associated (Cas) (CRISPR-Cas) type II system protein, wherein the nucleic acid encoding the CRISPR-Cas type II system protein is codon optimized for expression in the eukaryotic cell, wherein the CRISPR-Cas type II system protein is a Streptococcus pyogenes Cas9 protein including at least one nuclear localization signal consisting of SEQ ID NO;
1 or SEQ ID NO;
2 covalently attached to the C-terminal amino acid of the Cas9 protein sequence; and(ii) at least one engineered guide RNA or DNA encoding at least one engineered guide RNA, each guide RNA comprising (1) a first region at the 5′
end that base pairs with a target site in the chromosomal sequence, and(2) a second region that forms a secondary structure which interacts with the at least one RNA-guided endonuclease; and
, optionally,(iii) at least one donor polynucleotide; whereby the at least one guide RNA guides the at least one RNA-guided endonuclease to the target site in the chromosomal sequence where the RNA-guided endonuclease introduces a double-stranded break, the target site in the chromosomal sequence is immediately followed by a protospacer adjacent motif (PAM), and repair of the double-stranded break by a DNA repair process leads to modification of the chromosomal sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification