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Background  Genetic factors may influence an individual’s sensitivity to ionising radiation and therefore modify his/her risk of developing papillary thyroid carcinoma (PTC). Previously, we reported that common single nucleotide polymorphisms (SNPs) within the DNA damage recognition gene  ATM  contribute to PTC risk in Belarusian children exposed to fallout from the Chernobyl power plant accident. Here we explored in the same population the contribution of a panel of DNA repair-related SNPs in genes acting downstream of ATM.    Methods  The association of 141 SNPs located in 43 DNA repair genes was examined in 75 PTC cases and 254 controls from the Gomel region in Belarus. All subjects were younger than 15 years at the time of the Chernobyl accident. Conditional logistic regressions accounting for radiation dose were performed with PLINK using the additive allelic inheritance model, and a linkage disequilibrium (LD)-based Bonferroni correction was used for correction for multiple testing.    Results  The intronic SNP rs2296675 in  MGMT  was associated with an increased PTC risk [per minor allele odds ratio (OR) 2.54 95% CI 1.50, 4.30,  P   per allele  = 0.0006,  P    corr.=  0.05], and gene-wide association testing highlighted a possible role for  ERCC5  ( P   Gene  = 0.01) and  PCNA  ( P   Gene  = 0.05) in addition to  MGMT  ( P   Gene  = 0.008).    Conclusions  These findings indicate that several genes acting in distinct DNA repair mechanisms contribute to PTC risk. Further investigation is needed to decipher the functional properties of the methyltransferase encoded by  MGMT  and to understand how alteration of such functions may lead to the development of the most common type of thyroid cancer.    Electronic supplementary material  The online version of this article (doi:10.1186/s12885-017-3314-5) contains supplementary material, which is available to authorized users.

bmc cancer

Investigation of DNA repair-related SNPs underlying susceptibility to papillary thyroid carcinoma reveals MGMT as a novel candidate gene in Belarusian children exposed to radiation