The importance of genetic recombination for fidelity of chromosome pairing in meiosis.

The importance of genetic recombination for fidelity of chromosome pairing in meiosis.
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遗传重组对于减数分裂中染色体配对保真度的重要性。

DOI:
10.1016/s1534-5807(03)00357-5
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发表时间:
2003
期刊:
影响因子:
11.8
通讯作者:
G. S. Roeder
G. S. Roeder
中科院分区:
生物学1区
文献类型:
--
作者:
Hideo Tsubouchi;G. S. Roeder;G. S. Roeder

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在芽殖酵母中,Hop 2蛋白的缺失导致非同源染色体之间形成广泛的联会复合体(SC),这表明Hop 2在减数分裂前期同源染色体的正确排列中起着至关重要的作用。遗传分析表明,Hop 2与大肠杆菌的两个同源蛋白Rad 51和Dmc 1在相同的通路中起作用。coliRecA.因此,hop 2突变体表型证明了重组机制在促进准确染色体配对方面的重要性。我们建议Dmc 1/Rad 51重组酶需要Hop 2来区分同源序列和非同源序列。因此,当Hop 2不存在时,非同源序列之间的相互作用变得不适当地稳定,并且可以启动SC形成。过表达RAD 51可显著抑制dmc 1和hop 2突变体的减数分裂缺陷。我们得出结论,Rad 51能够独立地进行同源性搜索,而Dmc 1需要额外的因素,如Hop 2。
In budding yeast, absence of the Hop2 protein leads to extensive synaptonemal complex (SC) formation between nonhomologous chromosomes, suggesting a crucial role for Hop2 in the proper alignment of homologous chromosomes during meiotic prophase. Genetic analysis indicates that Hop2 acts in the same pathway as the Rad51 and Dmc1 proteins, two homologs ofE. coliRecA. Thus, thehop2mutant phenotype demonstrates the importance of the recombination machinery in promoting accurate chromosome pairing. We propose that the Dmc1/Rad51 recombinases require Hop2 to distinguish homologous from nonhomologous sequences during the homology search process. Thus, when Hop2 is absent, interactions between nonhomologous sequences become inappropriately stabilized and can initiate SC formation. Overexpression ofRAD51largely suppresses the meiotic defects of thedmc1andhop2mutants. We conclude that Rad51 is capable of carrying out a homology search independently, whereas Dmc1 requires additional factors such as Hop2.
DMC1 在酿酒酵母减数分裂途径中发挥作用,该途径很大程度上独立于 RAD51 途径。
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