Influence of a polymorphic genes combination on the risk of developing intestinal infections, induction of regulatory and effector peptides

Background. The high incidence rate, the severity and the occurrence of complications determine the relevance of intestinal infections today. The individual’s immune response, which is controlled by the polymorphism of inflammatory protein genes is significant in the development and course of the disease. This issue in relation to intestinal infections has been understudied and is of interest in researching the influence of gene polymorphism on the development of intestinal infections.

The aim. To establish the presence of an associative relationship between the set of IL-2 T330G and TLR-4 ASP299GLY polymorphic genes and the likelihood of developing an acute intestinal infection, as well as the role of a combination of genes in induction of inflammatory proteins.

Materials and methods. The study included 108 people with acute intestinal infection and 94 apparently healthy volunteers. To determine the concentration of cytokines, immunoglobulins, we used blood serum and Vector-Best (Koltsovo, Russian Federation) test systems. The polymorphism of the IL-2 T330G and TLR-4 ASP299GLY genes was determined by PCR using Litekh LLC (Moscow, Russian Federation) primers. Statistical analysis was carried out using the ICMJE (International Committee of Medical Journal Editors) principle and SAMPL (Statistical Analyses and Methods in Published Literature) recommendations by MS Excel 2010 (Microsoft Corp., USA) and Statistica 6.0 (StatSoft Inc., USA) software.

Results. When constructing the ROC curve, the area under the curve was within 0.77, sensitivity – 0.9, specificity – 0.5 (95% confidence interval: 0.7–0.84; p < 0.001). These results are at a good prognostic level with a high risk of the disease development. Comparing the level of pro-inflammatory and anti-inflammatory cytokines, immunoglobulins between the patients with -299А/А+-330GG haplotype of TLR4 ASP299GLY and IL-2 T330G genes and the carriers of only the dominant allele A of the TLR4 A/A299 genotype or only the minor allele G of IL-2 G/G330 we found no significant differences (p ≥ 0.05).

Conclusion. Among carriers of the -299А/А+-330GG haplotype of the TLR4 ASP299GLY and IL-2 T330G genes, the risk of the intestinal infection development increases, but this haplotype does not affect the production of inflammatory molecules.

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