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Persistent DNA-break potential near telomeres increases initiation of meiotic recombination on short chromosomes

Authors: Vijayalakshmi V. Subramanian; Xuan Zhu; Tovah E. Markowitz; Luis A. Vale-Silva; Pedro A. San-Segundo; Nancy M. Hollingsworth; Scott Keeney; +1 Authors

Persistent DNA-break potential near telomeres increases initiation of meiotic recombination on short chromosomes

Abstract

SUMMARY Faithful meiotic chromosome inheritance and fertility relies on the stimulation of meiotic crossover recombination by potentially genotoxic DNA double-strand breaks (DSBs). To avoid excessive damage, feedback mechanisms down-regulate DSBs on chromosomes that have successfully initiated crossover repair. In Saccharomyces cerevisiae , this regulation requires the removal of the conserved DSB-promoting protein Hop1/HORMAD during chromosome synapsis. Here, we identify privileged end-adjacent regions (EARs) spanning roughly 100 Kb near all telomeres that escape DSB downregulation. These regions retain Hop1 and continue to break in pachynema despite normal synaptonemal complex deposition. Differential retention of Hop1 requires the disassemblase Pch2/TRIP13, which preferentially removes Hop1 from telomere-distant sequences, and is modulated by the histone deacetylase Sir2 and the nucleoporin Nup2. Importantly, the uniform size of EARs among chromosomes contributes to disproportionately high DSB and repair signals on short chromosomes in pachynema, suggesting that EARs partially underlie the curiously high recombination rate of short chromosomes.

Keywords

Recombination, Genetic, Saccharomyces cerevisiae Proteins, Science, Q, Nuclear Proteins, Saccharomyces cerevisiae, Telomere, Article, DNA-Binding Proteins, Nuclear Pore Complex Proteins, Chromosome Pairing, Meiosis, Sirtuin 2, DNA Breaks, Double-Stranded, Chromosomes, Fungal, Silent Information Regulator Proteins, Saccharomyces cerevisiae

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
downloads
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54
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