期刊
MOLECULAR CELL
卷 29, 期 4, 页码 510-516出版社
CELL PRESS
DOI: 10.1016/j.molcel.2007.11.037
关键词
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资金
- Cancer Research UK Funding Source: Medline
- Breast Cancer Now [2004NOV03] Funding Source: Medline
Homologous recombination (HR) is essential for the repair of DNA double-strand breaks (DSBs) in mitotic and meiotic cells. HR occurs through a series of steps involving DSB resection, invasion of single-stranded DNA into homologous duplex DNA to form a D loop, repair synthesis, and second-end capture. We show that DNA repair synthesis, catalyzed by human DNA polymerase eta (pol eta) acting upon the priming strand of a D loop, leads to capture and annealing of the second end of a resected DSB in reactions mediated by RAD52 protein. Second-end capture products were not detected when pol eta was replaced by other polymerases such as pol delta or pol iota. RAD52 could not be replaced by RAD51. We also found that the RAD52-dependent reaction was stimulated by the single-strand binding protein RPA, but not by E. coli SSB. Following repair synthesis and second-end capture, de novo DNA synthesis was observed from the captured second DNA end.
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