Homologue engagement controls meiotic DNA break number and distribution.

Homologue engagement controls meiotic DNA break number and distribution.
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DOI:
10.1038/nature13120
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发表时间:
2014-06-12
期刊:
影响因子:
64.8
通讯作者:
Keeney, Scott
Keeney, Scott
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Thacker, Drew;Mohibullah, Neeman;Zhu, Xuan;Keeney, Scott

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减数分裂重组促进遗传多样性以及同源染色体的配对和分离,但启动重组的双链断裂(DSB)是危险的病变,可导致突变或减数分裂失败。细胞如何控制DSB以平衡有益和有害的结果尚不清楚。本研究测试的假设,DSB控制涉及交叉负调节回路的网络。使用多种互补的方法,我们表明,DSB的形式在更大的数量在酿酒酵母细胞缺乏ZMM蛋白,一套重组促进因子传统上被认为是严格的DSB形成下游。ZMM依赖的DSB控制在遗传上不同于通过Ndt80转录因子将断裂形成与减数分裂进展联系起来的途径。这些违反直觉的发现表明,成功地相互接合的同源染色体停止了断裂。全基因组DSB图谱揭示了不同亚染色体结构域对zmm突变zip3的不同反应,并表明Zip3是以前无法解释的DSB密度随染色体大小变化的趋势所必需的。因此,与ZMM功能相关的反馈以意想不到的方式有助于重组的空间模式化。
Meiotic recombination promotes genetic diversification as well as pairing and segregation of homologous chromosomes, but the double-strand breaks (DSBs) that initiate recombination are dangerous lesions that can cause mutation or meiotic failure. How cells control DSBs to balance between beneficial and deleterious outcomes is not well understood. This study tests the hypothesis that DSB control involves a network of intersecting negative regulatory circuits. Using multiple complementary methods, we show that DSBs form in greater numbers in Saccharomyces cerevisiae cells lacking ZMM proteins, a suite of recombination-promoting factors traditionally regarded as acting strictly downstream of DSB formation. ZMM-dependent DSB control is genetically distinct from a pathway tying break formation to meiotic progression through the Ndt80 transcription factor. These counterintuitive findings suggest that homologous chromosomes that have successfully engaged one another stop making breaks. Genome-wide DSB maps uncover distinct responses by different subchromosomal domains to the zmm mutation zip3, and show that Zip3 is required for the previously unexplained tendency of DSB density to vary with chromosome size. Thus, feedback tied to ZMM function contributes in unexpected ways to spatial patterning of recombination.
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