Cell reports · 2014
Transcription restores DNA repair to heterochromatin, determining regional mutation rates in cancer genomes.
СтатьяПоддержка NIH: внешняя программаПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Zheng Christina L, Wang Nicholas J, Chung Jongsuk, Moslehi Homayoun, Sanborn J Zachary, Hur Joseph S, Collisson Eric A, Vemula Swapna S, Naujokas Agne, Chiotti Kami E, Cheng Jeffrey B, Fassihi Hiva, Blumberg Andrew J, Bailey Celeste V, Fudem Gary M, Mihm Frederick G, Cunningham Bari B, Neuhaus Isaac M, Liao Wilson, Oh Dennis H, Cleaver James E, LeBoit Philip E, Costello Joseph F, Lehmann Alan R, Gray Joe W, Spellman Paul T, Arron Sarah T, Huh Nam, Purdom Elizabeth, Cho Raymond J
Аннотация
Somatic mutations in cancer are more frequent in heterochromatic and late-replicating regions of the genome. We report that regional disparities in mutation density are virtually abolished within transcriptionally silent genomic regions of cutaneous squamous cell carcinomas (cSCCs) arising in an XPC(-/-) background. XPC(-/-) cells lack global genome nucleotide excision repair (GG-NER), thus establishing differential access of DNA repair machinery within chromatin-rich regions of the genome as the primary cause for the regional disparity. Strikingly, we find that increasing levels of transcription reduce mutation prevalence on both strands of gene bodies embedded within H3K9me3-dense regions, and only to those levels observed in H3K9me3-sparse regions, also in an XPC-dependent manner. Therefore, transcription appears to reduce mutation prevalence specifically by relieving the constraints imposed by chromatin structure on DNA repair. We model this relationship among transcription, chromatin state, and DNA repair, revealing a new, personalized determinant of cancer risk.