Robust crossover assurance and regulated interhomolog access maintain meiotic crossover number.

Robust crossover assurance and regulated interhomolog access maintain meiotic crossover number.
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DOI:
10.1126/science.1212424
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发表时间:
2011-12-02
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Villeneuve AM
Villeneuve AM
中科院分区:
其他
文献类型:
--
作者:
Rosu S;Libuda DE;Villeneuve AM

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大多数生物体依靠同源间交叉 (CO) 来确保适当的减数分裂染色体分离,但每对染色体产生的 CO 很少。通过监测秀丽隐杆线虫减数分裂期间确定的双链断裂(DSB)位点的修复事件,我们揭示了确保专性CO形成同时限制CO数量的机制。我们发现,在没有其他(新生)重组事件的抑制作用的情况下,CO 是首选的 DSB 修复结果。因此,每对染色体有一个 DSB 就足以确保 CO 的形成。此外,我们还表明,作为修复模板的同系物的访问受到调节,CO 和非交叉 (NCO) 途径同时关闭。我们建议同源间访问的调节限制了 CO 数量并导致 CO 干扰。
Most organisms rely on interhomolog crossovers (COs) to ensure proper meiotic chromosome segregation but make few COs per chromosome pair. By monitoring repair events at a defined double-strand break (DSB) site during Caenorhabditis elegans meiosis, we reveal mechanisms that ensure formation of the obligate CO while limiting CO number. We find that CO is the preferred DSB repair outcome in the absence of inhibitory effects of other (nascent) recombination events. Thus, a single DSB per chromosome pair is largely sufficient to ensure CO formation. Further, we show that access to the homolog as a repair template is regulated, shutting down simultaneously for both CO and noncrossover (NCO) pathways. We propose that regulation of interhomolog access limits CO number and contributes to CO interference.
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