The tricky path to recombining X and Y chromosomes in meiosis.

The tricky path to recombining X and Y chromosomes in meiosis.
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DOI:
10.1111/j.1749-6632.2012.06593.x
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发表时间:
2012-09
影响因子:
5.2
通讯作者:
Keeney S
Keeney S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kauppi L;Jasin M;Keeney S

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性染色体是哺乳动物雄性减数分裂的致命弱点。X和Y染色体的错误分离会导致性染色体非整倍体,导致不孕症和Klinefelter综合征等临床后果。减数分裂的成功需要所有的染色体找到它们的同源配对并实现重组和配对。许多物种的雄性染色体只有一个很小的同源区域(假常染色体区域,PAR),可以配对。直到最近,关于哺乳动物X和Y PAR中的重组和配对的动力学还知之甚少。在这里,我们回顾了我们关于小鼠减数分裂中PAR行为的最新发现。我们发现了常染色体和X-Y染色体之间意想不到的差异,即PAR重组和配对发生得更晚,并且受到不同的基因控制。这些发现表明,精母细胞已经进化出独特的策略,以确保成功的X-Y重组和染色体分离。
Sex chromosomes are the Achilles heel of male meiosis in mammals. Mis-segregation of the X and Y chromosomes leads to sex chromosome aneuploidies, with clinical outcomes such as infertility and Klinefelter syndrome. Successful meiotic divisions require that all chromosomes find their homologous partner and achieve recombination and pairing. Sex chromosomes in males of many species have only a small region of homology (the pseudoautosomal region, PAR) that enables pairing. Until recently, little was known about the dynamics of recombination and pairing within mammalian X and Y PARs. Here, we review our recent findings on PAR behavior in mouse meiosis. We uncovered unexpected differences between autosomal chromosomes and the X-Y chromosome pair, namely that PAR recombination and pairing occurs later, and is under different genetic control. These findings imply that spermatocytes have evolved distinct strategies that ensure successful X-Y recombination and chromosome segregation.
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