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• W2034756309 abstract "Trinucleotide repeat expansions cause 17 heritable human neurological disorders. In some diseases, somatic expansions occur in non-proliferating tissues such as brain where DNA replication is limited. This finding stimulated significant interest in replication-independent expansion mechanisms. Aberrant DNA repair is a likely source, based in part on mouse studies showing that somatic expansions are provoked by the DNA repair protein MutSβ (Msh2-Msh3 complex). Biochemical studies to date used cell-free extracts or purified DNA repair proteins to yield partial reactions at triplet repeats. The findings included expansions on one strand but not the other, or processing of DNA hairpin structures thought to be important intermediates in the expansion process. However, it has been difficult to recapitulate complete expansions in vitro, and the biochemical role of MutSβ remains controversial. Here, we use a novel in vitro assay to show that human cell-free extracts catalyze expansions and contractions of trinucleotide repeats without the requirement for DNA replication. The extract promotes a size range of expansions that is similar to certain diseases, and triplet repeat length and sequence govern expansions in vitro as in vivo. MutSβ stimulates expansions in the extract, consistent with aberrant repair of endogenous DNA damage as a source of expansions. Overall, this biochemical system retains the key characteristics of somatic expansions in humans and mice, suggesting that this important mutagenic process can be restored in the test tube." @default.
• W2034756309 created "2016-06-24" @default.
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• W2034756309 date "2013-01-22" @default.
• W2034756309 modified "2023-10-06" @default.
• W2034756309 title "Trinucleotide repeat expansions catalyzed by human cell-free extracts" @default.
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• W2034756309 doi "https://doi.org/10.1038/cr.2013.12" @default.
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