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- Title
The Rad1-Rad10 nuclease promotes chromosome translocations between dispersed repeats.
- Authors
Mazón, Gerard; Lam, Alicia F; Ho, Chu Kwen; Kupiec, Martin; Symington, Lorraine S
- Abstract
Holliday junctions can be formed during homology-dependent repair of DNA double-strand breaks, and their resolution is essential for chromosome segregation and generation of crossover products. The Mus81-Mms4 and Yen1 nucleases are required for mitotic crossovers between chromosome homologs in Saccharomyces cerevisiae; however, crossovers between dispersed repeats are still detected in their absence. Here we show that the Rad1-Rad10 nuclease promotes formation of crossover and noncrossover recombinants between ectopic sequences. Crossover products were not recovered from the mus81? rad1? yen1? triple mutant, indicating that all three nucleases participate in processing recombination intermediates that form between dispersed repeats. We suggest a new mechanism for crossovers that involves Rad1-Rad10 clipping and resolution of a single Holliday junction-containing intermediate by Mus81-Mms4 or Yen1 cleavage or by replication. Consistent with the model, we show accumulation of Rad1-dependent joint molecules in the mus81? yen1? mutant.
- Subjects
NUCLEASE genetics; CHROMOSOMAL translocation; CHROMOSOME segregation; CELL cycle; SACCHAROMYCES cerevisiae; HOLLIDAY junctions
- Publication
Nature Structural & Molecular Biology, 2012, Vol 19, Issue 9, p964
- ISSN
1545-9993
- Publication type
Article
- DOI
10.1038/nsmb.2359