Resolution of complex integration patterns to obtain single copy transgenes
First Claim
1. A method of resolving multiple copies of a construct integrated at a locus in a plant cell to a single copy of said construct at said locus, the method comprising:
- introducing into the cell a construct comprising an exogenous polynucleotide sequence flank by a first pair of recombination sites oriented such that contact with a recombinase would not result in deletion of the polynucleotide sequence from the construct to obtain a cell which comprises multiple copies of the construct integrated at a locus of a cell chromosome; and
contacting the locus with a recombinase that catalyzes recombination among the recombination sites of the multiple copies at said locus;
wherein the recombination results in resolution of the multiple copies of the introduced construct into a single copy of the construct integrated at said locus.
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Abstract
The present invention provides methods for producing a transgenic cell having a stably integrated, single copy of an exogenous polynucleotide sequence. The method, which resolves repeated insertions of the introduced polynucleotide sequence into a single copy, involves introducing into a genetic locus of a cell a polynucleotide sequence flanked on each end by a recombination site. The recombination sites are oriented such that contact with a recombinase would not result in deletion of the polynucleotide sequence from the construct. The multiple, tandem copies of the introduced polynucleotide locus are then contacted with a recombinase that catalyzes recombination among the recombination sites. As a result of this method, the multiple, tandem copies are resolved to a single copy.
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Citations
18 Claims
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1. A method of resolving multiple copies of a construct integrated at a locus in a plant cell to a single copy of said construct at said locus, the method comprising:
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introducing into the cell a construct comprising an exogenous polynucleotide sequence flank by a first pair of recombination sites oriented such that contact with a recombinase would not result in deletion of the polynucleotide sequence from the construct to obtain a cell which comprises multiple copies of the construct integrated at a locus of a cell chromosome; and contacting the locus with a recombinase that catalyzes recombination among the recombination sites of the multiple copies at said locus; wherein the recombination results in resolution of the multiple copies of the introduced construct into a single copy of the construct integrated at said locus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification