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American Association for the Advancement of Science, Science, 6063(334), p. 1713-1716, 2011

DOI: 10.1126/science.1210770

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Mismatch repair, but not heteroduplex rejection, is temporally coupled to DNA replication

This paper is available in a repository.
This paper is available in a repository.

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Data provided by SHERPA/RoMEO

Abstract

In eukaryotes, it is unknown if mismatch repair (MMR) is temporally coupled to DNA replication and how strand-specific MMR is directed. Here we fused Saccharomyces cerevisiae MSH6 with cyclins to restrict the availability of the Msh2-Msh6 mismatch recognition complex to either S-phase or G2/M. The Msh6-S cyclin fusion was proficient for suppressing mutations at three loci that replicate at mid-S-phase, whereas the Msh6-G2/M cyclin fusion was defective. However, the Msh6-G2/M cyclin fusion was functional for MMR at a very late-replicating region of the genome. In contrast, the heteroduplex rejection function of MMR during recombination was partially functional during both S-phase and G2/M. These results indicate a temporal coupling of MMR, but not heteroduplex rejection, to DNA replication.