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首页> 外文期刊>Nucleus >The cohesin complex prevents the end-joining of distant DNA double-strand ends in S phase: Consequences on genome stability maintenance
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The cohesin complex prevents the end-joining of distant DNA double-strand ends in S phase: Consequences on genome stability maintenance

机译:粘着蛋白复合物阻止了S期中遥远的DNA双链末端的末端连接:维持基因组稳定性的后果

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摘要

DNA double-strand break (DSB) repair is essential for genome stability maintenance, but the joining of distant DNA double strand ends (DSEs) inevitably leads to genome rearrangements. Therefore, DSB repair should be tightly controlled to secure genome stability while allowing genetic variability. Tethering of the proximal ends of a 2-ended DSB limits their mobility, protecting thus against their joining with a distant DSE. However, replication stress generates DSBs with only one DSE, on which tethering is impossible. Consistently, we demonstrated that the joining of 2 DSBs only 3.2 kb apart is repressed in the S, but not the G1, phase, revealing an additional mechanism limiting DNA ends mobility in S phase. The cohesin complex, by maintaining the 2 sister chromatids linked, limits DSEs mobility and thus represses the joining of distant DSEs, while allowing that of adjacent DSEs. At the genome scale, the cohesin complex protects against deletions, inversions, translocations and chromosome fusion.
机译:DNA双链断裂(DSB)修复对于维持基因组稳定性至关重要,但是遥远的DNA双链末端(DSE)的加入不可避免地导致基因组重排。因此,应严格控制DSB修复以确保基因组稳定性,同时允许遗传变异。 2端DSB的近端的系链限制了它们的移动性,从而防止了它们与遥远的DSE的连接。但是,复制压力会生成仅具有一个DSE的DSB,无法在其上进行绑定。一致地,我们证明了在S相中抑制了相距仅3.2 kb的2个DSB的连接,而在G1相中则没有,这揭示了限制DNA在S相中移动的另一种机制。粘着蛋白复合物通过维持2个姐妹染色单体的连接,限制了DSE的迁移性,从而抑制了远处DSE的结合,同时允许相邻DSE结合。在基因组规模上,粘着蛋白复合物可防止缺失,倒位,易位和染色体融合。

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