Journal
CURRENT GENETICS
Volume 64, Issue 2, Pages 359-364Publisher
SPRINGER
DOI: 10.1007/s00294-017-0760-1
Keywords
MRN; MRX; NHEJ; Schizosaccharomyces; Saccharomyces; Transposon
Categories
Funding
- National Science Foundation [1516220]
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [1516220] Funding Source: National Science Foundation
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Chromosomal breaks can be healed by several repair processes, including one called non-homologous end-joining (NHEJ) where the two broken ends are ligated together with a loss of 0-5 bp of DNA. The protein requirements for NHEJ of cut DNA ends in the budding yeast Saccharomyces cerevisiae include its version of the Mre11-Rad50-Nbs1 (MRN) complex. In contrast, the fission yeast Schizosaccharomyces pombe and mammalian cells do not require MRN for this process. Recent work in S. pombe used transposon excision to generate breaks that were capped by DNA hairpins, which must be opened to produce ligatable ends. Repair in S. pombe was through an NHEJ reaction that now requires MRN. Surprisingly, wild type cells and MRN mutants that lack nuclease activity showed the same levels of excision. These genetic results suggest that MRN recruits an unknown hairpin-opening nuclease for this unusual NHEJ reaction.
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