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• W2165377218 endingPage "1825" @default.
• W2165377218 startingPage "1815" @default.
• W2165377218 abstract "The expansion of CAG·CTG repeat sequences is the cause of several inherited human disorders. Longer alleles are associated with an earlier age of onset and more severe symptoms, and are highly unstable in the germline and soma with a marked tendency towards repeat length gains. Germinal expansions underlie anticipation; whereas age-dependent, tissue-specific, expansion-biased somatic instability probably contributes toward the progressive nature and tissue-specificity of the symptoms. The mechanism(s) of repeat instability is not known, but recent data have implicated mismatch-repair (MMR) gene mutS homologues in driving expansion. To gain further insight into the expansion mechanism, we have determined the levels of somatic mosaicism of a transgenic expanded CAG·CTG repeat in mice deficient for the Pms2 MMR gene. Pms2 is a MutL homologue that plays a critical role in the downstream processing of DNA mismatches. The rate of somatic expansion was reduced by ∼50% in Pms2-null mice. A higher frequency of rare, but very large, deletions was also detected in these animals. No significant differences were observed between Pms2+/+ and Pms2+/− mice, indicating that a single functional Pms2 allele is sufficient to generate normal levels of somatic mosaicism. These findings reveal that as well as MMR enzymes that directly bind mismatched DNA, proteins that are subsequently recruited to the complex also play a central role in the accumulation of repeat length changes. These data suggest that somatic expansion results not by replication slippage, single stranded annealing or simple MutS-mediated stabilization of secondary structures, but by inappropriate DNA MMR." @default.
• W2165377218 created "2016-06-24" @default.
• W2165377218 creator A5056576662 @default.
• W2165377218 date "2004-06-15" @default.
• W2165377218 modified "2023-10-16" @default.
• W2165377218 title "Pms2 is a genetic enhancer of trinucleotide CAG{middle dot}CTG repeat somatic mosaicism: implications for the mechanism of triplet repeat expansion" @default.
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• W2165377218 doi "https://doi.org/10.1093/hmg/ddh186" @default.
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