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TopBP1 associates with NBS1 and is involved in homologous recombination repair.

Abstract：

:TopBP1 is involved in DNA replication and DNA damage checkpoint. Recent studies have demonstrated that TopBP1 is a direct positive effecter of ATR. However, it is not known how TopBP1 recognizes damaged DNA. Here, we show that TopBP1 formed nuclear foci after exposure to ionizing radiation, but such TopBP1 foci were abolished in Nijmegen breakage syndrome cells. We also show that TopBP1 physically associated with NBS1 in vivo. These results suggested that NBS1 might regulate TopBP1 recruitment to the sites of DNA damage. TopBP1-depleted cells showed hypersensitivity to Mitomycin C and ionizing radiation, an increased frequency of sister-chromatid exchange level, and a reduced frequency of DNA double-strand break induced homologous recombination repair. Together, these results suggested that TopBP1 might be a mediator of DNA damage signaling from NBS1 to ATR and promote homologous recombination repair.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Morishima K,Sakamoto S,Kobayashi J,Izumi H,Suda T,Matsumoto Y,Tauchi H,Ide H,Komatsu K,Matsuura S

doi

10.1016/j.bbrc.2007.08.086

subject

Has Abstract

pub_date

2007-11-03 00:00:00

pages

872-9

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(07)01780-9

journal_volume

362

pub_type

杂志文章

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