Transcriptionally active chromatin recruits homologous recombination at DNA double-strand breaks.

Transcriptionally active chromatin recruits homologous recombination at DNA double-strand breaks.
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DOI:
10.1038/nsmb.2796
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发表时间:
2014-04
影响因子:
16.8
通讯作者:
Legube G
Legube G
中科院分区:
生物学1区
文献类型:
--
作者:
Aymard F;Bugler B;Schmidt CK;Guillou E;Caron P;Briois S;Iacovoni JS;Daburon V;Miller KM;Jackson SP;Legube G

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虽然同源重组(HR)和非同源末端连接(NHEJ)都可以修复DNA双链断裂(DSB),但其中一条或另一条途径的选择机制尚不清楚。在这里,我们表明转录活性的染色质优先被HR修复。使用染色质免疫沉淀测序(CHIP-SEQ),分析整个人类基因组中诱导的多个DSB的修复,我们确定了一组“HR倾向”的DSB,它们招募HR蛋白RAD51,进行切除,并依赖RAD51进行有效的修复。这些DSB位于转录活跃的基因中,通过转录延伸相关的组蛋白标记,组蛋白H3赖氨酸36三甲基化(H3K36me3)靶向HR修复。一致认为,主要的H3K36三甲基转移酶SETD2的缺失严重阻碍了这种DSB的HR。我们的研究由此证明了染色质上下文在DSB修复中的主要作用,在染色质上下文中发生了断裂。
While both Homologous recombination (HR) and Non Homologous End Joining (NHEJ) can repair DNA double Strand Breaks (DSB), the mechanisms by which one or other of these pathways is chosen remain unclear. Here we show that transcriptionally active chromatin is preferentially repaired by HR. Using chromatin immunoprecipitation-sequencing (ChIP-seq), to analyse repair of multiple DSBs induced throughout the human genome, we identify an “HR-prone” subset of DSBs that recruit the HR protein RAD51, undergo resection and rely on RAD51 for efficient repair. These DSBs are located in actively transcribed genes, and targeted to HR repair via the transcription-elongation associated histone mark, histone H3 lysine 36 trimethylation (H3K36me3). In agreement, depletion of SETD2, the main H3K36 tri-methyltransferase, severely impedes HR at such DSBs. Our study thereby demonstrates a primary role of the chromatin context, in which a break occurs, in DSB repair.
DOI: 10.1038/nature09906
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