Licensing MLH1 sites for crossover during meiosis.

Licensing MLH1 sites for crossover during meiosis.
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DOI:
10.1038/ncomms5580
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发表时间:
2014-08-06
影响因子:
16.6
通讯作者:
Moore G
Moore G
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Martín AC;Shaw P;Phillips D;Reader S;Moore G

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在减数分裂期间,同源染色体在错配修复蛋白MLH 1结合标记的位点处突触和重组。在六倍体小麦中,Ph 1基因座对同源物之间或相关同源物之间是否发生交叉具有重要影响。在这里,我们报告说,在小麦黑麦杂交同源物缺席Ph 1既不影响突触的水平,也不MLH 1的数量。因此,在小麦-野生近缘杂种的情况下,Ph 1必须影响MLH 1位点是否能够进行交换。观察到的突触水平意味着Ph 1的功能是促进小麦中的同源配对,而不是抑制同源配对。因此,Ph 1通过促进同源配对和防止MLH 1位点在减数分裂期间在配对的同源物上发生交叉来稳定小麦中的多倍性。 多倍体物种的生育力依赖于配对和重组,而不是真正的同源染色体之间发生的分歧也存在。在这里,马丁等人表明,Ph 1通过促进同源配对和防止减数分裂期间配对的同源物上的交叉来稳定小麦中的多倍性。
During meiosis, homologous chromosomes synapse and recombine at sites marked by the binding of the mismatch repair protein MLH1. In hexaploid wheat, the Ph1 locus has a major effect on whether crossover occurs between homologues or between related homoeologues. Here we report that—in wheat–rye hybrids where homologues are absent—Ph1 affects neither the level of synapsis nor the number of MLH1. Thus in the case of wheat–wild relative hybrids, Ph1 must affect whether MLH1 sites are able to progress to crossover. The observed level of synapsis implies that Ph1 functions to promote homologue pairing rather than suppress homoeologue pairing in wheat. Therefore, Ph1 stabilises polyploidy in wheat by both promoting homologue pairing and preventing MLH1 sites from becoming crossovers on paired homoeologues during meiosis. Fertility in polyploid species relies on pairing and recombination occurring only between true homologues rather than the diverged homoeologous chromosomes also present. Here, Martin et al. show that Ph1 stabilises polyploidy in wheat by promoting homologue pairing and preventing crossovers on paired homoeologues during meiosis.
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