PARP-1 ensures regulation of replication fork progression by homologous recombination on damaged DNA.
PARP-1 ensures regulation of replication fork progression by homologous recombination on damaged DNA.
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DOI:
10.1083/jcb.200806068
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发表时间:
2008-12-29
期刊:
影响因子:
--
通讯作者:
Okumura K
中科院分区:
文献类型:
--
作者:
Sugimura K;Takebayashi S;Taguchi H;Takeda S;Okumura K
Poly-ADP ribose polymerase 1 (PARP-1) is activated by DNA damage and has been implicated in the repair of single-strand breaks (SSBs). Involvement of PARP-1 in other DNA damage responses remains controversial. In this study, we show that PARP-1 is required for replication fork slowing on damaged DNA. Fork progression in PARP-1−/− DT40 cells is not slowed down even in the presence of DNA damage induced by the topoisomerase I inhibitor camptothecin (CPT). Mammalian cells treated with a PARP inhibitor or PARP-1–specific small interfering RNAs show similar results. The expression of human PARP-1 restores fork slowing in PARP-1−/− DT40 cells. PARP-1 affects SSB repair, homologous recombination (HR), and nonhomologous end joining; therefore, we analyzed the effect of CPT on DT40 clones deficient in these pathways. We find that fork slowing is correlated with the proficiency of HR-mediated repair. Our data support the presence of a novel checkpoint pathway in which the initiation of HR but not DNA damage delays the fork progression.
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