Background: There is evidence showing the association between connexin 37 (Cx37) C1019T polymorphism and acute myocardial infarction (AMI). Since there has been no study that takes the polymorphisms of Cx37 and connexin 40 (Cx40) into consideration at the same time, we investigated the association between AMI and the polymorphism gene of two gap junction proteins Cx 37 and Cx40 which are important in the electrical coupling between arterial myocytes.
Methods: 200 patients with acute myocardial infarction (AMI) and 185 healthy controls were included in this study. Cx37 and Cx40 genotypes were determined by polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP).
Results: We identified that single nucleotide polymorphism (SNP) of Cx37 was significantly associated with AMI disease. Significant differences between cases and controls were observed for Cx37 genotype frequencies (p < 0.001, χ² = 16.528). The T allele of Cx37 had more frequency in the AMI group compared to the control group. (53.75% vs. 40%; p < 0.05). Subsequent analysis identified that, in contrast to the previous studies, there is a significant difference in women (p < 0.01) but not in men. We also found that the SNP of Cx40 was not significantly associated with AMI disease (p > 0.05). Our study showed that the -44A allele and -44AA genotype were not significantly different in the AMI and control groups (p > 0.05).
Conclusions: It is suggested that the polymorphism in the Cx37 gene (but not Cx40 gene) potentially plays a significant role in the manifestation of AMI disease in Iranian population.