NOVEL FRT RECOMBINATION SITES AND METHODS OF USE
First Claim
1. A plant cell having stably incorporated into its genome at least a first and a second transfer cassette, whereinsaid first transfer cassette comprises a first nucleotide sequence of interest flanked by a first and a second recombination site, wherein said first and said second recombination sites are dissimilar and non-recombinogenic with respect to one another;
- said second transfer cassette comprises a second nucleotide sequence of interest flanked by the second recombination site and a third recombination site, wherein said third recombination site is dissimilar and non-recombinogenic to said first and said second recombination site; and
,said second recombination site is shared between the first and the second transfer cassette, such that the genome of the plant cell comprises in the following order the first recombination site, the first nucleotide sequence of interest, the second recombination site, the second nucleotide sequence of interest, and the third recombination site,wherein said first, said second and said third recombination sites are selected from the group consisting of FRT1 (SEQ ID NO;
39), FRT12 (SEQ ID NO;
21), and FRT87 (SEQ ID NO;
24).
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Abstract
Methods and compositions using populations of randomized modified FRT recombination sites to identify, isolate and/or characterize modified FRT recombination sites are provided. The recombinogenic modified FRT recombination sites can be employed in a variety of methods for targeted recombination of polynucleotides of interest, including methods to recombine polynucleotides, assess promoter activity, directly select transformed organisms, minimize or eliminate expression resulting from random integration into the genome of an organism, such as a plant, remove polynucleotides of interest, combine multiple transfer cassettes, invert or excise a polynucleotide, and identify and/or characterize transcriptional regulating regions are also provided.
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Citations
22 Claims
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1. A plant cell having stably incorporated into its genome at least a first and a second transfer cassette, wherein
said first transfer cassette comprises a first nucleotide sequence of interest flanked by a first and a second recombination site, wherein said first and said second recombination sites are dissimilar and non-recombinogenic with respect to one another; -
said second transfer cassette comprises a second nucleotide sequence of interest flanked by the second recombination site and a third recombination site, wherein said third recombination site is dissimilar and non-recombinogenic to said first and said second recombination site; and
,said second recombination site is shared between the first and the second transfer cassette, such that the genome of the plant cell comprises in the following order the first recombination site, the first nucleotide sequence of interest, the second recombination site, the second nucleotide sequence of interest, and the third recombination site, wherein said first, said second and said third recombination sites are selected from the group consisting of FRT1 (SEQ ID NO;
39), FRT12 (SEQ ID NO;
21), and FRT87 (SEQ ID NO;
24). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method to combine multiple transfer cassettes at one location in a genome of a plant cell, said method comprising:
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a) stably incorporating into the genome of the plant cell, a target site comprising at least a first and a second recombination site, wherein said first and said second recombination sites are dissimilar and non-recombinogenic with respect to one another; b) introducing into the plant cell a first transfer cassette comprising in the following order at least the first, a third, and the second recombination sites, wherein the first and the third recombination sites of the first transfer cassette flank a first nucleotide sequence of interest, and wherein said third recombination site is dissimilar and non-recombinogenic to said first and said second recombination sites; c) providing a first recombinase that recognizes and implements recombination at the first and the second non-identical recombination sites. wherein said first, said second and said third recombination sites are selected from the group consisting of FRT1 (SEQ ID NO;
39), FRT12 (SEQ ID NO;
21). and FRT87 (SEQ ID NO;
24). - View Dependent Claims (11, 12, 13, 14, 15, 22)
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16. A method to combine multiple transfer cassettes at one location in a genome of a plant cell, said method comprising:
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a) stably incorporating into the genome of the plant cell, a target site comprising in the following order a first, a second, and a third recombination site, wherein said first, said second and said third recombination sites are dissimilar and non-recombinogenic with respect to one another; b) introducing into the plant cell a first transfer cassette comprising the first and the second recombination sites, wherein the first and the second recombination sites of the first transfer cassette flank a first nucleotide sequence of interest; and
,c) providing a FLP recombinase that recognizes and implements recombination at the first and the second recombination sites; wherein said first, said second and said third recombination sites are selected from the group consisting of FRT1 (SEQ ID NO;
39), FRT12 (SEQ ID NO;
21) and FRT87 (SEQ ID NO;
24). - View Dependent Claims (17, 18, 19, 20, 21)
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Specification