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. 1995 May;140(1):55–66. doi: 10.1093/genetics/140.1.55

Factors That Affect the Location and Frequency of Meiosis-Induced Double-Strand Breaks in Saccharomyces Cerevisiae

T C Wu 1, M Lichten 1
PMCID: PMC1206571  PMID: 7635308

Abstract

Double-strand DNA breaks (DSBs) initiate meiotic recombination in Saccharomyces cerevisiae. DSBs occur at sites that are hypersensitive in nuclease digests of chromatin, suggesting a role for chromatin structure in determining DSB location. We show here that the frequency of DSBs at a site is not determined simply by DNA sequence or by features of chromatin structure. An arg4-containing plasmid was inserted at several different locations in the yeast genome. Meiosis-induced DSBs occurred at similar sites in pBR322-derived portions of the construct at all insert loci, and the frequency of these breaks varied in a manner that mirrored the frequency of meiotic recombination in the arg4 portion of the insert. However, DSBs did not occur in the insert-borne arg4 gene at a site that is frequently broken at the normal ARG4 locus, even though the insert-borne arg4 gene and the normal ARG4 locus displayed similar DNase I hypersensitivity patterns. Deletions that removed active DSB sites from an insert at HIS4 restored breaks to the insert-borne arg4 gene and to a DSB site in flanking chromosomal sequences. We conclude that the frequency of DSB at a site can be affected by sequences several thousands nucleotides away and suggest that this is because of competition between DSB sites for locally limited factors.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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