- FLP-FRT recombination
In
genetics , FLP-FRT recombination is a site-directed recombination technology used to manipulate an organism's DNA under controlled conditions "in vivo". It is analogous toCre-Lox recombination . It involves the recombination of sequences between short Flipase Recognition Target (FRT) sites by the Flipase recombination enzyme (FLP or Flp) derived from the yeast "Saccharomyces cerevisiae ".The 34bp long FRT site sequence is :5'-GAAGTTCCTATTCtctagaaaGTATAGGAACTTC-3'.
Flipase (flp) binds to the 13-bp 5'-GAAGTTCCTATTC-3' and to the reverse complement of 5'-GTATAGGAACTTC-3' (5'-GAAGTTCCTATAC-3').
Cleavage site occurs just before 5'-tctagaaa-3', the 8bp asymetric core region, where recombination takes place.
Several variant FRT sites exist. Recombination can occur between two identical FRT sites but generally not between non-identical FRT sites
Many available constructs include the sequence5'-GAAGTTCCTATTCC-3'immediately upstream the FRT site(resulting in 5'-GAAGTTCCTATTCCGAAGTTCCTATTCtctagaaaGTATAGGAACTTC-3')but this sequence is dispensable for recombination.
FLP-FRT is used to construct Genetic Mosaics in multicellular organisms and to precisely engineer genomes via Recombinase-mediated cassette exchange (RMCE).
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