Journal
ONCOTARGET
Volume 7, Issue 17, Pages 23156-23169Publisher
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.6804
Keywords
double-strand break repair (DSBR) genes; colorectal cancer risk and clinical outcomes; miRNA binding sites; 3 ' UTR polymorphisms; MRE11A
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Funding
- Ministry of Health of the Czech Republic [IGA MZ: NT 15-26535A]
- Grant Agency of the Czech Republic [CZ GACR: GAP304/12/1585, 15-14789S]
- Istituto Toscano Tumori (Italy) [I56D15000010002]
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Genetic variations in 3' untranslated regions of target genes may affect microRNA binding, resulting in differential protein expression. microRNAs regulate DNA repair, and single-nucleotide polymorphisms in miRNA binding sites (miRSNPs) may account for interindividual differences in the DNA repair capacity. Our hypothesis is that miRSNPs in relevant DNA repair genes may ultimately affect cancer susceptibility and impact prognosis. In the present study, we analysed the association of polymorphisms in predicted microRNA target sites of double-strand breaks (DSBs) repair genes with colorectal cancer (CRC) risk and clinical outcome. Twenty-one miRSNPs in non-homologous end-joining and homologous recombination pathways were assessed in 1111 cases and 1469 controls. The variant CC genotype of rs2155209 in MRE11A was strongly associated with decreased cancer risk when compared with the other genotypes (OR 0.54, 95% CI 0.38-0.76, p = 0.0004). A reduced expression of the reporter gene was observed for the C allele of this polymorphism by in vitro assay, suggesting a more efficient interaction with potentially binding miRNAs. In colon cancer patients, the rs2155209 CC genotype was associated with shorter survival while the TT genotype of RAD52 rs11226 with longer survival when both compared with their respective more frequent genotypes (HR 1.63, 95% CI 1.06-2.51, p = 0.03 HR 0.60, 95% CI 0.41-0.89, p = 0.01, respectively). miRSNPs in DSB repair genes involved in the maintenance of genomic stability may have a role on CRC susceptibility and clinical outcome.
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