Genetic polymorphism of some genes of toll-like receptors in patients with influenza A (H3N2)

Abstract

Background.Among all infectious diseases that occur in the human population, only acute respiratory viral infections, including influenza, lead to massive outbreaks, often taking on the character of epidemics and pandemics. Polymorphism of cytokine genes can be both a factor of predisposition and resistance to infection, the development of the disease, and a long, complicated course of influenza. Aim.Study of the genetic polymorphism of the genes of toll-like receptorsrs5743708 (Arg753Gln, G2258A),TLR3 rs3775291 (Phe412Leu, C1234T),TLR4 rs4986790 (Asp299Gly, A896G),TLR4 rs4986791 (Thr399Ile, C1196T)in healthy individuals and in patients with influenzaA(H3N2). Material and methods.The study, using the continuous sampling method, included patients with influenzaA (H3N2; 89people) who were treated at the Regional Clinical Infectious Diseases Hospital in Chita during the epidemic seasons of 20162017 and 20172018. The control group consisted of 96practically healthy donors. To analyze the polymorphism of theTLR2 rs5743708 (Arg753Gln, G2258A), TLR3 rs3775291 (Phe412Leu, C1234T), TLR4 rs4986790 (Asp299Gly, A896G),andTLR4 rs4986791 (Thr399Ile, C1196T)genes the method of polymerase chain reaction with electrophoretic detection using standard kits from Scientific and Production Company Litekh (Moscow) was applied.Statistical analysis was carried out in accordance with the principles of the International Committee of Medical Journal Editors and the Statistical Analysis and Methods in the Published Literature recommendations. Pearson's 2test was used for comparative evaluation of qualitative nominal data. Results.Patients with influenzaA (H3N2) more often had heterozygousTLR2 753Arg/Glnvariants [2=8.26, p=0.02; odds ratio (OR) 3.00; 95% confidence interval (CI) 1.336.73], homozygousTLR3 412Leu/Leuvariants (2=11.68, p=0.003; OR=2.39; 95% CI 1.043.61), heterozygous variants ofTLR4 299Asp/Gly(2=6.97; p=0.03; OR=2.15; 95% CI 1.024.70) and399Thr/Ile(2=8.39; p= 0.01; OR=2.30; 95% CI 1.064.88) compared with a group of healthy donors. Conclusion.The genotypes753Arg/Glnof theTLR2gene,412Leu/Leuof theTLR3gene,299Asp/Glyof theTLR4gene,Thr399Ileof theTLR4gene predispose to the development of influenzaA (H3N2); carriage of genotypes753Arg/Argof theTLR2gene,412Phe/Pheof theTLR3gene,299Asp/Aspof theTLR4gene,399Thr/Throf theTLR4gene reduces the likelihood of the influenzaA(H3N2) development.