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Title: Oncometabolites suppress DNA repair by disrupting local chromatin signalling.

Authors: Sulkowski, Parker L; Oeck, Sebastian; Dow, Jonathan; Economos, Nicholas G; Mirfakhraie, Lily; Liu, Yanfeng; Noronha, Katelyn; Bao, Xun; Li, Jing; Shuch, Brian M; King, Megan C; Bindra, Ranjit S; Glazer, Peter M

Published In Nature, (2020 06)

Abstract: Deregulation of metabolism and disruption of genome integrity are hallmarks of cancer1. Increased levels of the metabolites 2-hydroxyglutarate, succinate and fumarate occur in human malignancies owing to somatic mutations in the isocitrate dehydrogenase-1 or -2 (IDH1 or IDH2) genes, or germline mutations in the fumarate hydratase (FH) and succinate dehydrogenase genes (SDHA, SDHB, SDHC and SDHD), respectively2-4. Recent work has made an unexpected connection between these metabolites and DNA repair by showing that they suppress the pathway of homology-dependent repair (HDR)5,6 and confer an exquisite sensitivity to inhibitors of poly (ADP-ribose) polymerase (PARP) that are being tested in clinical trials. However, the mechanism by which these oncometabolites inhibit HDR remains poorly understood. Here we determine the pathway by which these metabolites disrupt DNA repair. We show that oncometabolite-induced inhibition of the lysine demethylase KDM4B results in aberrant hypermethylation of histone 3 lysine 9 (H3K9) at loci surrounding DNA breaks, masking a local H3K9 trimethylation signal that is essential for the proper execution of HDR. Consequently, recruitment of TIP60 and ATM, two key proximal HDR factors, is substantially impaired at DNA breaks, with reduced end resection and diminished recruitment of downstream repair factors. These findings provide a mechanistic basis for oncometabolite-induced HDR suppression and may guide effective strategies to exploit these defects for therapeutic gain.

PubMed ID: 32494005 Exiting the NIEHS site

MeSH Terms: Ataxia Telangiectasia Mutated Proteins/metabolism; Cell Line, Tumor; Chromatin/drug effects; Chromatin/metabolism*; DNA Breaks/drug effects; DNA Repair*/drug effects; Homologous Recombination*/drug effects; Humans; Jumonji Domain-Containing Histone Demethylases/antagonists & inhibitors; Lysine Acetyltransferase 5/metabolism; Methylation/drug effects; Neoplasms/drug therapy; Neoplasms/genetics; Neoplasms/metabolism*; Neoplasms/pathology; Poly(ADP-ribose) Polymerase Inhibitors/pharmacology; Signal Transduction*/drug effects

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