| Literature DB >> 25456125 |
Christina L Zheng1, Nicholas J Wang2, Jongsuk Chung3, Homayoun Moslehi4, J Zachary Sanborn5, Joseph S Hur6, Eric A Collisson7, Swapna S Vemula8, Agne Naujokas8, Kami E Chiotti9, Jeffrey B Cheng4, Hiva Fassihi10, Andrew J Blumberg11, Celeste V Bailey12, Gary M Fudem13, Frederick G Mihm14, Bari B Cunningham15, Isaac M Neuhaus4, Wilson Liao4, Dennis H Oh16, James E Cleaver4, Philip E LeBoit8, Joseph F Costello17, Alan R Lehmann18, Joe W Gray19, Paul T Spellman20, Sarah T Arron4, Nam Huh3, Elizabeth Purdom21, Raymond J Cho22.
Abstract
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.Entities:
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Year: 2014 PMID： 25456125 PMCID： PMC4254608 DOI： 10.1016/j.celrep.2014.10.031
Source DB: PubMed Journal: Cell Rep Impact factor: 9.423