Abstract- Methionine synthase (MTR) is one of the key enzymes of folate pathway, which play a key role in the construction, repair, and methylation of DNA. In this study, an association of MTR A2756G gene transition with prostate cancer in men populations of Kashan-Iran was investigated by a case-control study and an in silico analysis. The 200 samples including 100 patients with prostate cancer, as case group and 100 healthy men, as control group included in this study. MTR-A2756G genotyping was performed by PCRRFLP technique. Some in silico tools used to evaluate the effects of A2756G transition on the structure and function of MTR. Results showed that the AG genotype (OR: 2.4014, 95% CI: 1.3216-4.3636, P=0.0040), and GG genotype (OR: 3.6324, 95% CI: 1.2629-10.4475, P=0.0167) and G allele (OR: 2.0120, 95% CI: 1.3098-3.0905, P=0.0014) were associated with prostate cancer. In silico analysis showed that polymorphisms of the enzyme protein might change properties of MTR such as relative mutability and flexibility, which leads to alteration of stability and function of the enzyme. Based on the results, an MTRA2756G polymorphism which changes activity and stability of the methionine synthase associated with prostate cancer in men. It is a preliminary study and is presenting data for future comprehensive study for making a clinical conclusion that this gene transition is a biomarker for susceptibility to prostate cancer. © 2017 Tehran University of Medical Sciences. All rights reserved.
