Importance of Genetic Polymorphisms (Rs662 and Rs854560) of the Paraoxonase-1 Gene as Risk Factor for Acute Ischemic Stroke in Turkish Population

Abstract

Introduction: Ischemic stroke is account for most of the mortality and morbidity cases around the World. Paraoxonase-1 (PON1) is a significant candidate gene for ischemic stroke because of its function against atherosclerosis. Methods: We studied two common polymorphisms (Q192R [rs662] and L55M [rs854560]) of PON1 gene using PCR-based RFLP assay. Overall, 107 patients diagnosed as acute ischemic stroke and 99 healthy controls were enrolled in the present study. We also carried out a meta-analysis containing 3 case-control studies from Turkey. Results: Allele frequencies of PON1 gene Q192R and L55M polymorphisms didn't demonstrate any significant differences between patients and controls (p > 0.05). However, genotype frequencies were significantly different between patients and controls in terms of Q192R polymorphism (p = 0.030). Statistically significant correlations were observed between systolic and diastolic blood pressures of patients and L55M polymorphism (p = 0.017 and p = 0.039, respectively). Heterozygosity for the both Q192R and L55M polymorphisms demonstrated a statistically significant association with acute ischemic stroke in composite genotype analyses (p = 0.033). The results of meta-analysis showed a significant correlation between acute ischemic stroke and the PON1 gene L55M polymorphism in Turkish population. Conclusion: PON1 gene Q192R and L55M polymorphisms may have effects on acute ischemic stroke susceptibility in Turkish population.