Exo1-protected DNA nicks direct crossover formation in meiosis
Exo1-protected DNA nicks direct crossover formation in meiosis
复制标题
Exo1 保护的 DNA 切口在减数分裂中直接交叉形成
DOI:
10.1101/2021.08.29.458102
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Gioia M, Payero L
中科院分区:
文献类型:
--
作者:
Gioia M, Payero L
In most sexually reproducing organisms crossing over between chromosome homologs during meiosis is essential to produce haploid gametes. Most crossovers that form in meiosis in budding yeast result from the biased resolution of double Holliday junction (dHJ) intermediates. This dHJ resolution step involves the actions of Rad2/XPG family nuclease Exo1 and the Mlh1-Mlh3 mismatch repair endonuclease. Here, we provide genetic evidence in baker’s yeast that Exo1 promotes meiotic crossing over by protecting DNA nicks from ligation. We found that structural elements in Exo1 that interact with DNA, such as those required for the bending of DNA during nick/flap recognition, are critical for its role in crossing over. Consistent with these observations, meiotic expression of the Rad2/XPG family member Rad27 partially rescued the crossover defect inexo1null mutants, and meiotic overexpression of Cdc9 ligase reduced the crossover levels ofexo1DNA-binding mutants to levels that approached theexo1null. In addition, our work identified a role for Exo1 in crossover interference. Together, these studies provide experimental evidence for Exo1-protected nicks being critical for the formation of meiotic crossovers and their distribution.
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DOI:
10.1016/j.cub.2020.12.018
发表时间:
2021-03-22
期刊:
Current biology : CB
影响因子:
--
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