Mutational impact of chronic alcohol use on stem cells in cirrhotic liver
Jager, M.; Kuijk, E.; Lieshout, R.; Locati, M.; Besselink, N.; van der Roest, B.; Janssen, R.; Boymans, S.; de Jonge, J.; IJzermans, J.; Doukas, M.; Verstegen, M.; van Boxtel, R.; van der Laan, L.; Cuppen, E.
Show abstract
Excessive alcohol consumption increases the risk of developing liver cancer, but the mechanism through which alcohol drives carcinogenesis is as yet unknown. Here, we determined the mutational consequences of chronic alcohol use on the genome of human liver stem cells prior to cancer development. No change in base substitution rate or spectrum could be detected. Analysis of the trunk mutations in an alcohol-related liver tumor by multi-site whole-genome sequencing confirms the absence of specific alcohol-induced mutational signatures driving the development of liver cancer. However, we did identify an enrichment of nonsynonymous base substitutions in cancer genes in stem cells of the cirrhotic livers, such as recurrent nonsense mutations in PTPRK that disturb Epidermal Growth Factor (EGF)-signaling. Our results thus suggest that chronic alcohol use does not contribute to carcinogenesis through altered mutagenicity, but instead induces microenvironment changes which provide a fertile ground for selection of cells with oncogenic mutations.
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