Comprehensive, fine-scale dissection of homologous recombination outcomes at a hot spot in mouse meiosis.
Comprehensive, fine-scale dissection of homologous recombination outcomes at a hot spot in mouse meiosis.
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DOI:
10.1016/j.molcel.2010.08.017
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发表时间:
2010-09-10
期刊:
影响因子:
16
通讯作者:
Jasin M
中科院分区:
文献类型:
--
作者:
Cole F;Keeney S;Jasin M
In mammalian meiosis, only a small fraction of programmed DNA double-strand breaks are repaired as inter-homolog crossovers (COs). To analyze another product of meiotic recombination, inter-homolog noncrossovers (NCOs), we performed high-resolution mapping of recombination events at an intensely active mouse hotspot in F1 hybrids derived from inbred mouse strains. We provide direct evidence that the vast majority of repair events are inter-homolog NCOs, consistent with models in which frequent inter-homolog interactions promote accurate chromosome pairing. NCOs peaked at the center of the hotspot, but were also broadly distributed throughout. In some hybrid strains, localized zones within the hotspot were highly refractory to COs and showed elevated frequency of co-conversion of adjacent polymorphisms in NCOs, raising the possibility of double-strand gap repair. Transmission distortion was observed in one hybrid, with NCOs providing a significant contribution. Thus, NCO recombination events play a substantial role in mammalian meiosis and genome evolution.
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DOI:
10.1073/pnas.97.17.9537
发表时间:
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