Mammalian XRCC2 promotes the repair of DNA double-strand breaks by homologous recombination Journal Article


Authors: Johnson, R. D.; Liu, N.; Jasin, M.
Article Title: Mammalian XRCC2 promotes the repair of DNA double-strand breaks by homologous recombination
Abstract: The repair of DNA double-strand breaks is essential for cells to maintain their genomic integrity. Two major mechanisms are responsible for repairing these breaks in mammalian cells, nonhomologous end-joining (NHEJ) and homologous recombination (HR): the importance of the former in mammalian cells is well established, whereas the role of the latter is just emerging. Homologous recombination is presumably promoted by an evolutionarily conserved group of genes termed the Rad52 epistasis group. An essential component of the HR pathway is the strand-exchange protein, known as RecA in bacteria or Rad51 in yeast. Several mammalian genes have been implicated in repair by homologous recombination on the basis of their sequence homology to yeast Rad51 (reft 11): one of these is human XRCC2 (refs 12, 13). Here we show that XRCC2 is essential for the efficient repair of DNA double-strand breaks by homologous recombination between sister chromatids. We find that hamster cells deficient in XRCC2 show more than a 100-fold decrease in HR induced by double-strand breaks compared with the parental cell line. This defect is corrected to almost wild-type levels by transient transfection with a plasmid expressing XRCC2. The repair defect in XRCC2 mutant cells appears to be restricted to recombinational repair because NHEJ is normal. We conclude that XRCC2 is involved in the repair of DNA double-strand breaks by homologous recombination.
Keywords: gene sequence; dna-binding proteins; nonhuman; genetic analysis; animal cell; mammalia; animals; dna repair; cell line; evolution; transfection; animalia; dna; double stranded dna; genetic recombination; recombination, genetic; mammal; genome; rad51 recombinase; cricetinae; hamster; humans; priority journal; article; kanamycin kinase
Journal Title: Nature
Volume: 401
Issue: 6751
ISSN: 0028-0836
Publisher: Nature Publishing Group  
Date Published: 1999-09-23
Start Page: 397
End Page: 399
Language: English
DOI: 10.1038/43935
PUBMED: 10517641
PROVIDER: scopus
DOI/URL:
Notes: Article -- Export Date: 16 August 2016 -- Source: Scopus
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MSK Authors
  1. Maria Jasin
    231 Jasin