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• W2204392137 abstract "Dmitry Gordenin and colleagues use a yeast reporter strain to identify distinct mutagenic signatures for the cytosine deaminases APOBEC3A and APOBEC3B. They find that cancer samples with APOBEC3A-like mutation signatures have greater than tenfold more APOBEC signature mutations than those with APOBEC3B-like signatures. Elucidation of mutagenic processes shaping cancer genomes is a fundamental problem whose solution promises insights into new treatment, diagnostic and prevention strategies1. Single-strand DNA–specific APOBEC cytidine deaminase(s) are major source(s) of mutation in several cancer types2,3,4. Previous indirect evidence implicated APOBEC3B as the more likely major mutator deaminase, whereas the role of APOBEC3A is not established5,6. Using yeast models enabling the controlled generation of long single-strand genomic DNA substrates7, we show that the mutation signatures of APOBEC3A and APOBEC3B are statistically distinguishable. We then apply three complementary approaches to identify cancer samples with mutation signatures resembling either APOBEC. Strikingly, APOBEC3A-like samples have over tenfold more APOBEC-signature mutations than APOBEC3B-like samples. We propose that APOBEC3A-mediated mutagenesis is much more frequent because APOBEC3A itself is highly proficient at generating DNA breaks8,9,10, whose repair can trigger the formation of single-strand hypermutation substrates." @default.
• W2204392137 created "2016-06-24" @default.
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• W2204392137 date "2015-08-10" @default.
• W2204392137 modified "2023-10-10" @default.
• W2204392137 title "An APOBEC3A hypermutation signature is distinguishable from the signature of background mutagenesis by APOBEC3B in human cancers" @default.
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• W2204392137 doi "https://doi.org/10.1038/ng.3378" @default.
• W2204392137 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4594173" @default.
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• W2204392137 hasPublicationYear "2015" @default.
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