The logic and mechanism of homologous recombination partner choice.

The logic and mechanism of homologous recombination partner choice.
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DOI:
10.1016/j.molcel.2013.08.008
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发表时间:
2013-08-22
期刊:
影响因子:
16
通讯作者:
Kim, Keun P.
Kim, Keun P.
中科院分区:
生物学1区
文献类型:
--
作者:
Hong, Soogil;Sung, Youngjin;Yu, Mi;Lee, Minsu;Kleckner, Nancy;Kim, Keun P.

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自发性双链断裂(DSB)的修复表现出姐妹偏倚。DSB启动的减数分裂重组表现出同源性偏好。酵母中的物理分析表明,在这两种情况下,重组本质上会产生同源偏倚。从这个基线默认,cohesin干预赋予姐妹偏见,可能独立的凝聚力。在减数分裂中,粘着蛋白的姐妹偏向效应被RecA同源物Rad 51及其介体加上减数分裂RecA同源物Dmc 1抵消,从而恢复内在同源物偏向。减数分裂轴复合体Red 1/Mek 1/Hop 1通过将重组从有丝分裂模式干净地切换到减数分裂模式来参与,同时激活Dmc 1。我们提出,Rad 51/DNA丝在一个DSB端捕获完整的姐妹,创造一个“锚垫”。这条细丝延伸穿过完整配偶体上的DSB位点,排除了姐妹链间的交换,从而迫使使用同源物。Cohesin和Dmc 1交互式地调节这种延伸,从而产生适合程序的效果。与该模型雅阁,Rad 51介导的体内重组需要姐妹的存在。
Recombinational repair of spontaneous double-strand breaks (DSBs) exhibits sister bias. DSB-initiated meiotic recombination exhibits homolog bias. Physical analysis in yeast reveals that, in both cases, recombination intrinsically gives homolog bias. From this baseline default, cohesin intervenes to confer sister bias, likely independent of cohesion. In meiosis, cohesin’s sister-biasing effect is counteracted by RecA-homolog Rad51 and its mediators, plus meiotic RecA- homolog Dmc1, which thereby restore intrinsic homolog bias. Meiotic axis complex Red1/Mek1/Hop1 participates by cleanly switching recombination from mitotic mode to meiotic mode, concomitantly activating Dmc1. We propose that a Rad51/DNA filament at one DSB end captures the intact sister, creating an “anchor pad”. This filament extends across the DSB site on the intact partner, precluding inter-sister strand exchange, thus forcing use of the homolog. Cohesin and Dmc1 interactively modulate this extension, giving program-appropriate effects. In accord with this model, Rad51-mediated recombination in vivo requires the presence of a sister.
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