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Rec10- and Rec12-independent recombination in meiosis of Schizosaccharomyces pombe.

Yeast. 2011 May;28(5):405-21. doi:10.1002/yea.1847. Epub 2011 Mar 08
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摘要


The Rec10 protein, a component of the linear elements forming along sister chromatids in meiotic prophase of Schizosaccharomyces pombe, plays an important role in the activation of Rec12 for double-strand break formation, and thus the initiation of recombination between homologous chromosomes. Recombination between homologous chromosomes was moderately reduced in homozygous crosses of the C-terminal truncation mutant rec10-155 and strongly in the full deletion allele rec10-175. Both alleles were also tested in two assays for intrachromosomal recombination (PS1 and VL1) and showed only slight reductions, while deletion of rec12 led to a 13-fold reduction. The even stronger reductions in rec10 rec12 double deletion crosses indicate partially redundant functions of Rec10 and Rec12 in the initiation of intrachromosomal recombination. A low level of double-strand breaks has been detected in rec10-175 meiosis at the mbs1 hotspot of recombination, and spore viability in the double mutant was also lower than in the single-deletion mutants. Low levels of apparent crossover and conversion between homologous chromosomes in the absence of Rec12 have been quantified using a newly developed assay. The results also indicate that the functions of Rec10 differ in several respects from those of its distant homologue Red1 in Saccharomyces cerevisiae, including interactions with Hop1 and Mek1 for promotion of recombination between homologues at the expense of sister chromatid recombination.

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