Association between eNOS gene promoter polymorphism (-786T>C) and idiopathic recurrent pregnancy loss in Iranian women

Objective: To investigate the frequency of -786T>C variant in endothelial nitric oxide synthase (eNOS) gene promoter in Iranian women with recurrent pregnancy loss. Methods: Blood samples were obtained from 100 unrelated women affected by recurrent pregnancy loss and 100 unaffected women as the controls. Genomic DNA was extracted and -786T>C polymorphism in eNOS gene promoter was investigated by PCR-RFLP method. Statistical analyses and Hardy-Weinberg equilibrium in the groups of patients and controls were performed by Chi-square test and SPSS standard software (Version 21). Results: The frequency of homozygous TT was 40% in cases and 46% in the control group; the frequency of CC was 7% in cases and 5% in the control group; frequency heterozygote TC was 53% in cases and 49% in the control group. Genotype frequencies between the two groups showed no significant differences (P>0.05). Conclusions: The -786T>C polymorphism is not more frequent in recurrent pregnancy loss in this population.