Fission yeast Mus81.Eme1 Holliday junction resolvase is required for meiotic crossing over but not for gene conversion.

Fission yeast Mus81.Eme1 Holliday junction resolvase is required for meiotic crossing over but not for gene conversion.
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裂殖酵母 Mus81.Eme1 霍利迪连接解离酶是减数分裂交换所必需的,但基因转换不需要。

DOI:
10.1093/genetics/165.4.2289
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发表时间:
2003
期刊:
影响因子:
3.3
通讯作者:
Russell,Paul
Russell,Paul
中科院分区:
生物学2区
文献类型:
--
作者:
Smith,GeraldR;Boddy,MichaelN;Shanahan,Paul;Russell,Paul

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大多数同源重组模型援引霍利迪结的裂解来解释交叉。来自分裂酵母和人类的Mus81·Eme1内切酶可以切割Holliday连接和其他分支DNA结构,使其生理底物不确定。我们在此报道,裂糖菌pombe mus81突变体具有正常或升高的基因转换频率,但杂交频率降低了20至100倍。因此,基因转换和杂交可以在遗传上分离,而杂交需要Mus81,这支持了分裂酵母Mus81·Eme1蛋白复合物在减数分裂细胞中分解Holliday连接的假设。
Most models of homologous recombination invoke cleavage of Holliday junctions to explain crossing over. The Mus81·Eme1 endonuclease from fission yeast and humans cleaves Holliday junctions and other branched DNA structures, leaving its physiological substrate uncertain. We report here thatSchizosaccharomyces pombe mus81mutants have normal or elevated frequencies of gene conversion but 20- to 100-fold reduced frequencies of crossing over. Thus, gene conversion and crossing over can be genetically separated, and Mus81 is required for crossing over, supporting the hypothesis that the fission yeast Mus81·Eme1 protein complex resolves Holliday junctions in meiotic cells.
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