ПОЛИМОРФИЗМЫ ГЕНОВ ФЕРМЕНТОВ АНТИОКСИДАНТНОЙ СИСТЕМЫ SOD2 (C47T, rS4880) И CAT (G262A, rS1001179) В ПАТОГЕНЕЗЕ ХРОНИЧЕСКОГО ГЕПАТИТА С

Abstract

Introduction. An important component in the pathogenesis of chronic hepatitis C is the imbalance in oxidant and antioxidant systems. It is known that mutations in genes of antioxidant enzymes can lead to changes in antioxidant potential. Aim. To determine correlations of polymorphic variants of SOD2 (C47T, rs4880), CAT (G262A, rs1001179) superoxide dismutase and catalase genes with antioxidant system activity and features of clinical course of chronic hepatitis C. Material and Methods. The study of single nucleotide variants of genes of antioxidant enzymes of superoxide dismutase SOD2 (C47T) and catalase CAT (G262A) was undertaken in 90 patients with chronic hepatitis C and 64 healthy controls. Genomic deoxyribonucleic acid from the epithelium of the inner surface of the cheek using ‘SNP-screen ‘ diagnostic reagents was analysed. The levels of superoxide dismutase, catalase, alanine aminotransferase enzymes and degree of liver fibrosis were determined in the group of chronic hepatitis C patients. Correlations between investigated indexes were studied. Results and discussion. The distribution of alleles and genotypes of single nucleotide variants of catalase CAT (G262A) and superoxide dismutase SOD2 (C47T) genes among healthy subjects and chronic hepatitis C patients (p>0,05) had no significant difference (p>0,05), which testified to absence of influence of the studied gene variants on the risk of hepatitis C virus infection. We revealed statistically significant correlation of single-nucleotide variants of SOD2 (C47T) and CAT (G262A) genes with the development of chronic hepatitis C. Patients having G allele (genotypes GG and GA) of CAT (G262A) single nucleotide variants had low level of catalase enzyme, high level of alanine aminotransferase and high degree of F3-F4 fibrosis (correlation coefficient = -0,88*, p˂0,01). In patients with CC genotype SOD2 (C47T) a strong correlation with serum superoxide dismutase activity, severity of cytolysis syndrome (increased alanine aminotransferase) and degree of liver fibrosis (correlation coefficient = +0,70; p˂0,01) was established. Conclusion. In infection with hepatitis C virus polymorphic variants of SOD2 (C47T) and CAT (G262A) antioxidant system enzyme genes are the risk factors of hepatitis C progression, influencing catalase and superoxide dismutase enzyme activity, cytolysis syndrome development, determining liver fibrosis formation.