Association of genetic variants affecting microRNAs and pancreatic cancer risk

Y Lu, C Corradi, M Gentiluomo… - Frontiers in …, 2021 - frontiersin.org
Y Lu, C Corradi, M Gentiluomo, E López de Maturana, GE Theodoropoulos, S Roth…
Frontiers in genetics, 2021frontiersin.org
Genetic factors play an important role in the susceptibility to pancreatic cancer (PC).
However, established loci explain a small proportion of genetic heritability for PC; therefore,
more progress is needed to find the missing ones. We aimed at identifying single nucleotide
polymorphisms (SNPs) affecting PC risk through effects on micro-RNA (miRNA) function. We
searched in silico the genome for SNPs in miRNA seed sequences or 3 prime untranslated
regions (3'UTRs) of miRNA target genes. Genome-wide association data of PC cases and …
Genetic factors play an important role in the susceptibility to pancreatic cancer (PC). However, established loci explain a small proportion of genetic heritability for PC; therefore, more progress is needed to find the missing ones. We aimed at identifying single nucleotide polymorphisms (SNPs) affecting PC risk through effects on micro-RNA (miRNA) function. We searched in silico the genome for SNPs in miRNA seed sequences or 3 prime untranslated regions (3'UTRs) of miRNA target genes. Genome-wide association data of PC cases and controls from the Pancreatic Cancer Cohort (PanScan) Consortium and the Pancreatic Cancer Case–Control (PanC4) Consortium were re-analyzed for discovery, and genotyping data from two additional consortia (PanGenEU and PANDoRA) were used for replication, for a total of 14,062 cases and 11,261 controls. None of the SNPs reached genome-wide significance in the meta-analysis, but for three of them the associations were in the same direction in all the study populations and showed lower value of p in the meta-analyses than in the discovery phase. Specifically, rs7985480 was consistently associated with PC risk (OR = 1.12, 95% CI 1.07–1.17, p = 3.03 × 10−6 in the meta-analysis). This SNP is in linkage disequilibrium (LD) with rs2274048, which modulates binding of various miRNAs to the 3'UTR of UCHL3, a gene involved in PC progression. In conclusion, our results expand the knowledge of the genetic PC risk through miRNA-related SNPs and show the usefulness of functional prioritization to identify genetic polymorphisms associated with PC risk.
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