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pubmed-article:16309779pubmed:abstractTextMismatch repair (MMR) proteins are important for antibody class-switch recombination (CSR), but their roles are unknown. We propose a model for the function of MMR in CSR in which MMR proteins convert single-strand nicks instigated by activation-induced cytidine deaminase (AID) into the double-strand breaks (DSBs) that are required for CSR. This model does not invoke any novel functions for MMR but simply posits that, owing to numerous single-strand nicks in the switch (S) regions of both DNA strands, when MMR proteins are recruited by U:G mismatches, they excise one strand of DNA and soon reach a nick on the opposite strand. This halts excision activity and creates a DSB. This model explains why B cells that lack either S mu and MSH2 or UNG and MSH2 cannot undergo CSR.lld:pubmed
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pubmed-article:16309779pubmed:articleTitleMismatch repair converts AID-instigated nicks to double-strand breaks for antibody class-switch recombination.lld:pubmed
pubmed-article:16309779pubmed:affiliationDepartment of Molecular Genetics and Microbiology, Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, MA 01655-0122, USA. janet.stavnezer@umassmed.edulld:pubmed
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