A Specific Mutational Signature Associated with DNA 8-Oxoguanine Persistence in MUTYH-defective Colorectal Cancer
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- Functional Onco-Genomics and Genetics, CRO Aviano National Cancer Institute, Aviano (Italy)
- Oncology and Molecular Medicine, Istituto Superiore di Sanita, Rome (Italy)
- Istituto Superiore di Sanita, Rome (Italy)
- CRO Aviano National Cancer Institute, Aviano (Italy)
- Ospedale Pediatrico Bambino Gesu, Rome (Italy)
- University of Padua (Italy)
- University of Padua (Italy); Nano Insperid Biomedicine Lab, Istituto di Ricerca Pediatrica (IRP), Padua (Italy)
- Institute of Genomic Medicine, Catholic University, Rome (Italy)
- Unit of Pathology, Candiolo Cancer Institute-FPO (Italy)
- Regina Elena National Cancer Institute, Rome (Italy)
- University La Sapienza, Rome (Italy)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); University of New Mexico Comprehensive Cancer Center, Albuquerque, NM (United States)
8-Oxoguanine, a common mutagenic DNA lesion, generates G:C > T:A transversions via mispairing with adenine during DNA replication. When operating normally, the MUTYH DNA glycosylase prevents 8-oxoguanine-related mutagenesis by excising the incorporated adenine. Biallelic MUTYH mutations impair this enzymatic function and are associated with colorectal cancer (CRC) in MUTYH-Associated Polyposis (MAP) syndrome. Here in this paper, we perform whole-exome sequencing that reveals a modest mutator phenotype in MAP CRCs compared to sporadic CRC stem cell lines or bulk tumours. The excess G:C > T:A transversion mutations in MAP CRCs exhibits a novel mutational signature, termed Signature 36, with a strong sequence dependence. The MUTYH mutational signature reflecting persistent 8-oxoG:A mismatches occurs frequently in the APC, KRAS, PIK3CA, FAT4, TP53, FAT1, AMER1, KDM6A, SMAD4 and SMAD2 genes that are associated with CRC. In conclusion, the occurrence of Signature 36 in other types of human cancer indicates that DNA 8-oxoguanine-related mutations might contribute to the development of cancer in other organs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1356131
- Report Number(s):
- LA-UR--16-22282
- Journal Information:
- EBioMedicine, Journal Name: EBioMedicine Vol. 20; ISSN 2352-3964
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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