VARIANTS OF С-572G OF IL6 AND С-1112T OF IL13 GENES POLYMORPHISMS AND FEATURES OF THE CLINICAL COURSE OF DIFFUSE TOXIC GOITER

Relevance. Diffuse toxic goiter (DTG) is an autoimmune thyroid disease, which is based on the excessive secretion of autoantibodies to thyroid-stimulating hormone receptor (TRAb). Over the last decades, high relapse rate of thyrotoxicosis is observed after withdrawal of conservative therapy. At the same time, there are no reliable criteria to predict the efficiency of drug therapy. It is widely discussedin literature that singlenucleotide polymorphism (SNP) at cytokine-encoding genesnot only confers susceptibility to the DTG, but also has impact on the features ofclinical course of the disease .The aim of this study was to determine whether the SNPs in -572C/G (rs1800796) of IL6 or -1112C/Т (rs1800925) of IL13 genes can influence thedevelopment and clinical course of the diffuse toxic goiter (DTG).Materials and methods. We examined 270 patients with diffuse toxic goiter and 200 healthy persons (reference subjects)with the help of molecular genetic analysis of polymorphic variants of the gene encoding the Pro-inflammatory cytokines. Identification of C-572G of IL6 gene and C-1112T of IL13gene was performed using the PCR method followed by the restriction analysis.Results. We determined that the carriage of -572G allele of the rs1800796 in IL6 gene isassociated with the growth of recurrence risk of thyrotoxicosis and the absence of remission of DTGin 1.3 times (р=0.031, OR=1.3, 95 %, CI 0.98–1.76) and the carriage of CC genotype of the rs1800925 in IL13 – in 2.3 times (р=0.026, OR=2.3, 95 %, CI 1.09–4.82) respectively. The obtained results allowed to revealnew genetic markers of an adverse course in patients with diffuse toxic goiter, Saint Petersburg residents.