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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...

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PhiC31 integrase induces efficient site-specific excision in zebrafish.

Jianjun Lu1, Lisette A Maddison, Wenbiao Chen

  • 1Vollum Institute, OHSU, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA.

Transgenic Research
|June 18, 2010
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Summary

The phiC31 integrase system efficiently performs site-specific DNA recombination in zebrafish embryos. This expands genetic manipulation tools for this important vertebrate model organism.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • Site-specific recombinases like Cre and Flp are crucial for DNA manipulation.
  • The phiC31 integrase system, recognizing heterotypic sites, offers an alternative for genetic engineering.
  • Previous applications of phiC31 were in mammalian cells and Drosophila, but not zebrafish.

Purpose of the Study:

  • To investigate the efficiency of the phiC31 integrase system for DNA recombination in zebrafish.
  • To determine if phiC31 can catalyze site-specific deletion of both episomal and chromosomal DNA in zebrafish embryos.

Main Methods:

  • Utilized the phiC31 integrase system in zebrafish embryos.
  • Assessed the recombination efficiency on both episomal and chromosomal DNA targets.

Main Results:

  • phiC31 integrase demonstrated efficient site-specific deletion of episomal DNA targets in zebrafish.
  • Chromosomal targets were also efficiently deleted by phiC31 integrase in zebrafish embryos.
  • The phiC31 system proved effective for genetic manipulation in zebrafish.

Conclusions:

  • The phiC31 integrase system is effective for site-specific DNA recombination in zebrafish embryos.
  • This finding broadens the toolkit available for genetic manipulation in zebrafish research.
  • The phiC31 system expands genetic engineering capabilities in this vertebrate model.