BRCA1 and CtIP suppress long-tract gene conversion between sister chromatids.

BRCA1 and CtIP suppress long-tract gene conversion between sister chromatids.
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DOI:
10.1038/ncomms3404
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发表时间:
2013
影响因子:
16.6
通讯作者:
Scully, Ralph
Scully, Ralph
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chandramouly, Gurushankar;Kwok, Amy;Huang, Bin;Willis, Nicholas A.;Xie, Anyong;Scully, Ralph

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BRCA 1控制同源重组的合成依赖性链退火(SDSA)途径的早期步骤,但在Rad 51介导的突触后没有已知的作用。在这里,我们表明,BRCA 1影响突触后同源重组事件,控制短(STGC)和长道基因转换(LTGC)之间的平衡姐妹染色单体。Brca 1突变细胞显示出对LTGC的偏好,这种偏好通过野生型而不是癌症易感性BRCA 1等位基因的表达来纠正。LTGC偏倚通过CtIP的耗尽而增强,但通过53 BP 1的抑制而逆转,暗示DNA末端切除是STGC/LTGC平衡的贡献者。当断裂的第二(非侵入)末端不能支持通过同源配对(“退火”)终止STGC时,BRCA 1/CtIP缺失对STGC/LTGC平衡的影响被消除。这表明BRCA 1/CtIP介导的断裂第二末端的加工控制了通常终止SDSA的退火步骤,从而抑制了易错的LTGC结果。
BRCA1 controls early steps of the synthesis-dependent strand annealing (SDSA) pathway of homologous recombination, but has no known role following Rad51-mediated synapsis. Here we show that BRCA1 influences post-synaptic homologous recombination events, controlling the balance between short- (STGC) and long-tract gene conversion (LTGC) between sister chromatids. Brca1 mutant cells reveal a bias towards LTGC that is corrected by expression of wild type but not cancer-predisposing BRCA1 alleles. The LTGC bias is enhanced by depletion of CtIP but reversed by inhibition of 53BP1, implicating DNA end resection as a contributor to the STGC/LTGC balance. The impact of BRCA1/CtIP loss on the STGC/LTGC balance is abolished when the second (non-invading) end of the break is unable to support termination of STGC by homologous pairing (“annealing”). This suggests that BRCA1/CtIP-mediated processing of the second end of the break controls the annealing step that normally terminates SDSA, thereby suppressing the error-prone LTGC outcome.
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