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Mapping Of Meiotic Single-Stranded DNA Reveals Double-Strand-Break Hotspots Near Centromeres And Telomeres
Hannah G. Blitzblau, G. Bell, Joseph Rodriguez, S. P. Bell, Andreas Hochwagen
Published 2007 · Biology, Medicine
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BACKGROUND Every chromosome requires at least one crossover to be faithfully segregated during meiosis. At least two levels of regulation govern crossover distribution: where the initiating DNA double-strand breaks (DSBs) occur and whether those DSBs are repaired as crossovers. RESULTS We mapped meiotic DSBs in budding yeast by identifying sites of DSB-associated single-stranded DNA (ssDNA) accumulation. These analyses revealed substantial DSB activity in pericentrometric regions, in which crossover formation is largely absent. Our data suggest that centromeric suppression of recombination occurs at the level of break repair rather than DSB formation. Additionally, we found an enrichment of DSBs within a approximately 100 kb region near the ends of all chromosomes. Introduction of new telomeres was sufficient for inducing large ectopic regions of increased DSB formation, thereby revealing a remarkable long-range effect of telomeres on DSB formation. The concentration of DSBs close to chromosome ends increases the relative DSB density on small chromosomes, providing an interference-independent mechanism that ensures that all chromosomes receive at least one crossover per homolog pair. CONCLUSIONS Together, our results indicate that selective DSB repair accounts for crossover suppression near centromeres and suggest a simple telomere-guided mechanism that ensures sufficient DSB activity on all chromosomes.
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