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• W1972809713 abstract "Meiotic recombination involves the generation of double-strand breaks, that needs to be carefully controlled to avoid fetal aneuploidy. In worms and yeast, crossover numbers are constant regardless of the amount of double-strand breaks. Jasin and colleagues now show that such crossover homeostasis mechanisms exist at two stages in mammalian meiosis. Humans suffer from high rates of fetal aneuploidy, often arising from the absence of meiotic crossover recombination between homologous chromosomes1. Meiotic recombination is initiated by double-strand breaks (DSBs) generated by the SPO11 transesterase2. In yeast and worms, at least one buffering mechanism, crossover homeostasis, maintains crossover numbers despite variation in DSB numbers3,4,5,6,7,8. We show here that mammals exhibit progressive homeostatic control of recombination. In wild-type mouse spermatocytes, focus numbers for early recombination proteins (RAD51, DMC1) were highly variable from cell to cell, whereas foci of the crossover marker MLH1 showed little variability. Furthermore, mice with greater or fewer copies of the Spo11 gene—with correspondingly greater or fewer numbers of early recombination foci—exhibited relatively invariant crossover numbers. Homeostatic control is enforced during at least two stages, after the formation of early recombination intermediates and later while these intermediates mature towards crossovers. Thus, variability within the mammalian meiotic program is robustly managed by homeostatic mechanisms to control crossover formation, probably to suppress aneuploidy. Meiotic recombination exemplifies how order can be progressively implemented in a self-organizing system despite natural cell-to-cell disparities in the underlying biochemical processes." @default.
• W1972809713 created "2016-06-24" @default.
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• W1972809713 date "2012-03-04" @default.
• W1972809713 modified "2023-10-02" @default.
• W1972809713 title "Homeostatic control of recombination is implemented progressively in mouse meiosis" @default.
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• W1972809713 doi "https://doi.org/10.1038/ncb2451" @default.
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