Mouse tetrad analysis provides insights into recombination mechanisms and hotspot evolutionary dynamics.

Mouse tetrad analysis provides insights into recombination mechanisms and hotspot evolutionary dynamics.
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DOI:
10.1038/ng.3068
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发表时间:
2014-10
期刊:
影响因子:
30.8
通讯作者:
Jasin, Maria
Jasin, Maria
中科院分区:
生物学1区
文献类型:
--
作者:
Cole, Francesca;Baudat, Frederic;Grey, Corinne;Keeney, Scott;de Massy, Bernard;Jasin, Maria

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在酵母四分体中检测来自单个减数分裂的所有染色单体的能力对于确定由DNA双链断裂(DSB)引发的同源重组机制是必不可少的。使用一个广泛适用的策略,从一个单一的减数分裂在两个重组热点在小鼠卵母细胞和精母细胞的染色单体的分析,我们在这里展示了单向传递的信息-基因转换-在交叉和noncrossovers。而在交叉的基因转换是与相互交换,未断裂的染色单体不改变非交叉基因转换,提供了强有力的证据,noncrossovers来自一个独特的途径。基因转换经常使热点特异性蛋白PRDM 9的结合位点不受影响,从而减缓了热点的侵蚀。因此,小鼠四分体分析表明哺乳动物重组机制的独特方面如何塑造热点进化动力学。
The ability to examine all chromatids from a single meiosis in yeast tetrads has been indispensable for defining mechanisms of homologous recombination initiated by DNA double-strand breaks (DSBs). Using a broadly applicable strategy for the analysis of chromatids from a single meiosis at two recombination hotspots in mouse oocytes and spermatocytes, we demonstrate here the unidirectional transfer of information — gene conversion — in both crossovers and noncrossovers. Whereas gene conversion in crossovers is associated with reciprocal exchange, the unbroken chromatid is not altered in noncrossover gene conversions, providing strong evidence that noncrossovers arise from a distinct pathway. Gene conversion frequently spares the binding site of the hotspot-specifying protein PRDM9 with the result that erosion of the hotspot is slowed. Thus, mouse tetrad analysis demonstrates how unique aspects of mammalian recombination mechanisms shape hotspot evolutionary dynamics.
DOI: 10.1101/gad.1944710
发表时间: 2010-06-15
影响因子: 10.5
作者:
Cole, Francesca;Keeney, Scott;Jasin, Maria
通讯作者: Jasin, Maria
DOI: 10.1371/journal.pgen.0030100
发表时间: 2007-06-01
期刊: PLOS GENETICS
影响因子: 4.5
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影响因子: 12.3
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