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PMS2 endonuclease activity has distinct biological functions and is essential for genome maintenance.

Authors:
van Oers JM, Roa S, Werling U, Liu Y, Genschel J, Hou H, Sellers RS, Modrich P, Scharff MD, Edelmann W
Affiliation:
Journal:
Proceedings of the National Academy of Sciences of the United States of America

Abstract

The DNA mismatch repair protein PMS2 was recently found to encode a novel endonuclease activity. To determine the biological functions of this activity in mammals, we generated endonuclease-deficient Pms2E702K knock-in mice. Pms2EK/EK mice displayed increased genomic mutation rates and a strong cancer predisposition. In addition, class switch recombination, but not somatic hypermutation, was impaired in Pms2EK/EK B cells, indicating a specific role in Ig diversity. In contrast to Pms2-/- mice, Pms2EK/EK male mice were fertile, indicating that this activity is dispensable in spermatogenesis. Therefore, the PMS2 endonuclease activity has distinct biological functions and is essential for genome maintenance and tumor suppression.

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