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• W2409293519 endingPage "786" @default.
• W2409293519 startingPage "775" @default.
• W2409293519 abstract "Expansion of (CAG)•(CTG) repeats causes a number of familial neurodegenerative disorders. Although the underlying mechanism remains largely unknown, components involved in DNA mismatch repair, particularly mismatch recognition protein MutSβ (a MSH2-MSH3 heterodimer), are implicated in (CAG)•(CTG) repeat expansion. In addition to recognizing small insertion-deletion loop-outs, MutSβ also specifically binds DNA hairpin imperfect heteroduplexes formed within (CAG)n•(CTG)n sequences. However, whether or not and how MutSβ binding triggers expansion of (CAG)•(CTG) repeats remain unknown. We show here that purified recombinant MutSβ physically interacts with DNA polymerase β (Polβ) and stimulates Polβ-catalyzed (CAG)n or (CTG)n hairpin retention. Consistent with these in vitro observations, MutSβ and Polβ interact with each other in vivo, and colocalize at (CAG)•(CTG) repeats during DNA replication. Our data support a model for error-prone processing of (CAG)n or (CTG)n hairpins by MutSβ and Polβ during DNA replication and/or repair: MutSβ recognizes (CAG)n or (CTG)n hairpins formed in the nascent DNA strand, and recruits Polβ to the complex, which then utilizes the hairpin as a primer for extension, leading to (CAG)•(CTG) repeat expansion. This study provides a novel mechanism for trinucleotide repeat expansion in both dividing and non-dividing cells." @default.
• W2409293519 created "2016-06-24" @default.
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• W2409293519 date "2016-06-03" @default.
• W2409293519 modified "2023-10-07" @default.
• W2409293519 title "MutSβ promotes trinucleotide repeat expansion by recruiting DNA polymerase β to nascent (CAG)n or (CTG)n hairpins for error-prone DNA synthesis" @default.
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• W2409293519 doi "https://doi.org/10.1038/cr.2016.66" @default.
• W2409293519 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5129881" @default.
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