FLP-mediated gene modification in mammalian cells, and compositions and cells useful therefor
First Claim
1. A composition that effects recombination in mammalian cells comprising:
- (i) an isolated and purified FLP recombinase, or an isolated and purified nucleotide sequence encoding same, and(ii) a first DNA comprising a nucleotide sequence containing a first FLP recombination target site (FRT) therein,wherein the genome of the mammalian cells contains a stably integrated second FRT site, and wherein said FLP recombinase catalyzes recombination between said first FRT and the second FRT, thereby precisely targeting integration of said first DNA into the genome.
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Abstract
A gene activation/inactivation and site-specific integration system has been developed for mammalian cells. The invention system is based on the recombination of transfected sequences by FLP, a recombinase derived from Saccharomyces. In several cell lines, FLP has been shown to rapidly and precisely recombine copies of its specific target sequence. For example, a chromosomally integrated, silent β-galactosidase reporter gene was activated for expression by FLP-mediated removal of intervening sequences to generate clones of marked cells. Alternatively, the reverse reaction can be used to target transfected DNA to specific chromosomal sites. These results demonstrate that FLP can be used, for example, to mosaically activate or inactivate transgenes for a variety of therapeutic purposes, as well as for analysis of vertebriate development.
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Citations
24 Claims
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1. A composition that effects recombination in mammalian cells comprising:
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(i) an isolated and purified FLP recombinase, or an isolated and purified nucleotide sequence encoding same, and (ii) a first DNA comprising a nucleotide sequence containing a first FLP recombination target site (FRT) therein, wherein the genome of the mammalian cells contains a stably integrated second FRT site, and wherein said FLP recombinase catalyzes recombination between said first FRT and the second FRT, thereby precisely targeting integration of said first DNA into the genome. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A DNA construct comprising, as an autonomous fragment, in the following order, reading from 5'"'"' to 3'"'"' along said fragment:
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(a) a first FLP recombination target site, (b) an insert segment comprising; (1) at least one restriction endonuclease recognition site, (2) at least one marker gene, (3) a bacterial origin of replication, and optionally (4) a mammalian cellular or viral origin of DNA replication, and (c) a second FLP recombination target site in tandem with said first FLP recombination target site.
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15. A method for the assembly of functional gene(s) for expression in mammalian cells, by recombination of individual inactive gene segments from one or more gene(s) of interest, wherein each of said segments contains at least one FRT, said method comprising:
contacting said individual inactive gene segments with a FLP recombinase, under conditions suitable for recombination to occur, thereby providing upon recombination a DNA which encodes a functional gene of interest, the expression product of which is biologically active. - View Dependent Claims (16, 17, 18)
- 19. An isolated mammalian cell, Wherein the genomic DNA of said cell contains an inserted heterologous first DNA comprising at least one FLP recombination target site therein.
Specification