The ERCC1/XPF endonuclease is required for efficient single-strand annealing and gene conversion in mammalian cells.

The ERCC1/XPF endonuclease is required for efficient single-strand annealing and gene conversion in mammalian cells.
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DOI:
10.1093/nar/gkm888
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发表时间:
2008-01
影响因子:
14.9
通讯作者:
Helleday T
Helleday T
中科院分区:
生物学2区
文献类型:
--
作者:
Al-Minawi AZ;Saleh-Gohari N;Helleday T

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哺乳动物ERCC 1-XPF核酸内切酶在通过单链退火(SSA)修复DNA双链断裂(DSB)中具有建议的作用。在这里,我们研究了ERCC 1在哺乳动物细胞同源重组中的作用,并证实了ERCC 1在SSA中的作用。有趣的是,我们还报告了ERCC 1在基因转换中的意想不到的作用。这为哺乳动物体细胞中的基因转换是通过合成依赖性链退火而不是通过双霍利迪连接机制进行提供了支持。此外,我们发现低频率的SSA和基因转换在G1期阻滞的细胞,这表明SSA是不是一个频繁的DSB修复途径在G1期阻滞的哺乳动物细胞,即使在存在完美的重复。此外,我们发现SSA不受CDK 2(使用Roscovitine),ATM(使用咖啡因和KU 55933),Chk 1(使用CEP-3891)或DNA-PK(使用NU 7026)抑制的影响。
The mammalian ERCC1-XPF endonuclease has a suggested role in the repair of DNA double-strand breaks (DSB) by single-strand annealing (SSA). Here, we investigated the role of ERCC1 in homologous recombination in mammalian cells, and confirm a role of ERCC1 in SSA. Interestingly, we also report an unexpected role for ERCC1 in gene conversion. This provides support that gene conversion in mammalian somatic cells is carried out through synthesis-dependent strand annealing, rather than through a double Holliday Junction mechanism. Moreover, we find low frequencies of SSA and gene conversion in G1-arrested cells, suggesting that SSA is not a frequent DSB repair pathway in G1-arrested mammalian cells, even in the presence of perfect repeats. Furthermore, we find that SSA is not influenced by inhibition of CDK2 (using Roscovitine), ATM (using Caffeine and KU55933), Chk1 (using CEP-3891) or DNA-PK (using NU7026).
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