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PRDM9 determines the localization of meiotic recombination hotspots, which are associated with histone H3 methylation. It is not known whether PRDM9’s methyltransferase activity is required or how some PRDM9 alleles can dominate the distribution of hotspots over other alleles. Diagouraga, Clément, and colleagues (2018) show that methyltransferase activity is required for hotspot localization and that...
Faithful chromosome segregation in meiosis requires crossover (CO) recombination, which is regulated to ensure at least one CO per homolog pair. We investigate the failure to ensure COs in juvenile male mice. By monitoring recombination genome-wide using cytological assays and at hotspots using molecular assays, we show that juvenile mouse spermatocytes have fewer COs relative to adults. Analysis...
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