Methods and compositions for using zinc finger endonucleases to enhance homologous recombination
First Claim
1. A method of generating a genetically modified cell, comprising:
- providing a primary cell containing an endogenous chromosomal target DNA sequence in which it is desired to have homologous recombination occur;
providing a zinc finger endonuclease comprising an endonuclease domain that cuts DNA, and a zinc finger domain comprising a plurality of zinc fingers that bind to a specific nucleotide sequence within said endogenous chromosomal target DNA in said primary cell;
contacting said endogenous chromosomal target DNA sequence with said zinc finger endonuclease in said primary cell such that said zinc finger endonuclease cuts both strands of a nucleotide sequence within said endogenous chromosomal target DNA sequence in said primary cell, thereby enhancing the frequency of homologous recombination in said endogenous chromosomal target DNA sequence; and
providing a nucleic acid comprising a sequence homologous to at least a portion of said endogenous chromosomal target DNA such that homologous recombination occurs between said endogenous chromosomal target DNA sequence and said nucleic acid.
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Accused Products
Abstract
Embodiments relate to methods of generating a genetically modified cell. The methods can include providing a primary cell containing an endogenous chromosomal target DNA sequence in which it is desired to have homologous recombination occur. The methods also can include providing a zinc finger endonuclease (ZFE) that includes an endonuclease domain that cuts DNA, and a zinc finger domain that includes a plurality of zinc fingers that bind to a specific nucleotide sequence within the endogenous chromosomal target DNA in the primary cell. Further, the methods can include contacting the endogenous chromosomal target DNA sequence with the zinc finger endonuclease in the primary cell such that the zinc finger endonuclease cuts both strands of a nucleotide sequence within the endogenous chromosomal target DNA sequence in the primary cell, thereby enhancing the frequency of homologous recombination in the endogenous chromosomal target DNA sequence. The methods also include providing a nucleic acid comprising a sequence homologous to at least a portion of said endogenous chromosomal target DNA such that homologous recombination occurs between the endogenous chromosomal target DNA sequence and the nucleic acid.
439 Citations
36 Claims
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1. A method of generating a genetically modified cell, comprising:
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providing a primary cell containing an endogenous chromosomal target DNA sequence in which it is desired to have homologous recombination occur;
providing a zinc finger endonuclease comprising an endonuclease domain that cuts DNA, and a zinc finger domain comprising a plurality of zinc fingers that bind to a specific nucleotide sequence within said endogenous chromosomal target DNA in said primary cell;
contacting said endogenous chromosomal target DNA sequence with said zinc finger endonuclease in said primary cell such that said zinc finger endonuclease cuts both strands of a nucleotide sequence within said endogenous chromosomal target DNA sequence in said primary cell, thereby enhancing the frequency of homologous recombination in said endogenous chromosomal target DNA sequence; and
providing a nucleic acid comprising a sequence homologous to at least a portion of said endogenous chromosomal target DNA such that homologous recombination occurs between said endogenous chromosomal target DNA sequence and said nucleic acid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of designing a sequence specific zinc finger endonuclease capable of cleaving DNA at a specific location, comprising:
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identifying a first unique endogenous chromosomal nucleotide sequence adjacent to a second nucleotide sequence at which it is desired to introduce a double-stranded cut; and
designing a combination of sequence specific zinc finger endonucleases that are capable of cleaving DNA at a specific location, said zinc finger endonucleases comprising a plurality of zinc fingers which bind to said unique endogenous chromosomal nucleotide sequence and an endonuclease which generates a double-stranded cut at said second nucleotide sequence.
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17. A zinc finger endonuclease for cutting a specific DNA sequence to enhance the rate of homologous recombination, comprising:
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an endonuclease domain;
a zinc finger domain specific for an endogenous chromosomal DNA sequence; and
a purification tag. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method of generating a genetically modified animal in which a desired nucleic acid has been introduced, comprising:
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obtaining a primary cell comprising an endogenous chromosomal target DNA sequence into which it is desired to introduce said nucleic acid;
generating a double-stranded cut within said endogenous chromosomal target DNA sequence with a zinc finger endonuclease comprising a zinc finger domain that binds to an endogenous target nucleotide sequence within said target sequence and an endonuclease domain;
introducing an exogenous nucleic acid comprising a sequence homologous to at least a portion of said endogenous chromosomal target DNA into said primary cell under conditions which permit homologous recombination to occur between said exogenous nucleic acid and said endogenous chromosomal target DNA; and
generating an animal from said primary cell in which homologous recombination has occurred. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of generating a genetically modified plant in which a desired nucleic acid has been introduced, comprising:
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obtaining a plant cell comprising an endogenous target DNA sequence into which it is desired to introduce said nucleic acid;
generating a double-stranded cut within said endogenous target DNA sequence with a zinc finger endonuclease comprising a zinc finger domain that binds to an endogenous target nucleotide sequence within said target sequence and an endonuclease domain;
introducing an exogenous nucleic acid comprising a sequence homologous to at least a portion of said endogenous target DNA into said plant cell under conditions which permit homologous recombination to occur between said exogenous nucleic acid and said endogenous target DNA; and
generating a plant from said plant cell in which homologous recombination has occurred. - View Dependent Claims (36)
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Specification