Mutational signature of aristolochic acid exposure as revealed by whole-exome sequencing.


:In humans, exposure to aristolochic acid (AA) is associated with urothelial carcinoma of the upper urinary tract (UTUC). Exome sequencing of UTUCs from 19 individuals with documented exposure to AA revealed a remarkably large number of somatic mutations and an unusual mutational signature attributable to AA. Most of the mutations (72%) in these tumors were A:T-to-T:A transversions, located predominantly on the nontranscribed strand, with a strong preference for deoxyadenosine in a consensus sequence (T/CAG). This trinucleotide motif overlaps the canonical splice acceptor site, possibly accounting for the excess of splice site mutations observed in these tumors. The AA mutational fingerprint was found frequently in oncogenes and tumor suppressor genes in AA-associated UTUC. The AA mutational signature was observed in one patient's tumor from a UTUC cohort without previous indication of AA exposure. Together, these results directly link an established environmental mutagen to cancer through genome-wide sequencing and highlight its power to reveal individual exposure to carcinogens.


Sci Transl Med


Hoang ML,Chen CH,Sidorenko VS,He J,Dickman KG,Yun BH,Moriya M,Niknafs N,Douville C,Karchin R,Turesky RJ,Pu YS,Vogelstein B,Papadopoulos N,Grollman AP,Kinzler KW,Rosenquist TA




Has Abstract


2013-08-07 00:00:00














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