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Journal Article

Base-excision repair pathway shapes 5-methylcytosine deamination signatures in pan-cancer genomes

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Özemek,  Begüm       
Gene Regulation and Systems Biology of Cancer (Marie-Laure Yaspo), Independent Junior Research Groups (OWL), Max Planck Institute for Molecular Genetics, Max Planck Society;

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Yaspo,  Marie-Laure       
Gene Regulation and Systems Biology of Cancer (Marie-Laure Yaspo), Independent Junior Research Groups (OWL), Max Planck Institute for Molecular Genetics, Max Planck Society;

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Citation

Bortolini Silveira, A., Houy, A., Ganier, O., Özemek, B., Vanhuele, S., Vincent-Salomon, A., et al. (2024). Base-excision repair pathway shapes 5-methylcytosine deamination signatures in pan-cancer genomes. Nature Communications, 15(1): Article 9864. doi:10.1038/s41467-024-54223-z.


Cite as: https://hdl.handle.net/21.11116/0000-0010-48F1-D
Abstract
Transition of cytosine to thymine in CpG dinucleotides is the most frequent type of mutation in cancer. This increased mutability is commonly attributed to the spontaneous deamination of 5-methylcytosine (5mC), which is normally repaired by the base-excision repair (BER) pathway. However, the contribution of 5mC deamination in the increasing diversity of cancer mutational signatures remains poorly explored. We integrate mutational signatures analysis in a large series of tumor whole genomes with lineage-specific epigenomic data to draw a detailed view of 5mC deamination in cancer. We uncover tumor type-specific patterns of 5mC deamination signatures in CpG and non-CpG contexts. We demonstrate that the BER glycosylase MBD4 preferentially binds to active chromatin and early replicating DNA, which correlates with lower mutational burden in these domains. We validate our findings by modeling BER deficiencies in isogenic cell models. Here, we establish MBD4 as the main actor responsible for 5mC deamination repair in humans.