Blood DNA methylation, nevi number, and the risk of melanoma.

Abstract:

:Germline mutations determining increased cutaneous malignant melanoma (CMM) risk have been identified in familial and sporadic CMM cases, but they account only for a small proportion of CMM cases. Recent evidence suggests that germline epimutations (e.g. DNA methylation alterations), which can be inherited similarly to genomic mutations and can be detected in normal body cells (including blood), might increase susceptibility to cancer. The aim of the study was to identify germline epimutations of genes that were found to be mutated in familial CMM (p16, p14, CDK4, MC1R, hTERT), immune and inflammatory genes (ICAM-1, TNFα), DNA mismatch repair gene (MLH1), and repetitive elements (ALU, LINE-1, HERV-w). We measured DNA methylation using bisulfite pyrosequencing in peripheral blood mononuclear cells from 167 CMM cases and 164 sex-matched and age-matched controls. We used multivariable logistic regression models to evaluate the association between methylation levels and CMM status or presence of dysplastic nevi. We found an association between the risk of CMM and peripheral blood mononuclear cell methylation levels of TNFα [odds ratio (OR)=1.11, 95% confidence interval (CI)=1.03-1.18], CDK4 (OR=0.76, 95% CI=0.64-0.91), and MLH1 (OR=1.12, 95% CI=1.02-1.22). In control participants, the risk of developing dysplastic nevi was associated with methylation levels of TNFα (OR=0.81, 95% CI=0.69-0.95), hTERT (OR=0.90, 95% CI=0.82-0.99), and ALU (OR=1.56, 95% CI=1.02-2.39). Epimutations in CMM susceptibility genes and in genes involved in response to oxidative damage are associated with the risk of developing CMM or dysplastic nevi. Further studies measuring methylation levels of these genes in prospectively collected samples are warranted to further elucidate their role in the development and progression of CMM.

journal_name

Melanoma Res

journal_title

Melanoma research

authors

Pergoli L,Favero C,Pfeiffer RM,Tarantini L,Calista D,Cavalleri T,Angelici L,Consonni D,Bertazzi PA,Pesatori AC,Landi MT,Bollati V

doi

10.1097/CMR.0000000000000112

subject

Has Abstract

pub_date

2014-10-01 00:00:00

pages

480-7

issue

5

eissn

0960-8931

issn

1473-5636

journal_volume

24

pub_type

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