Zaporožskij Medicinskij Žurnal (Dec 2019)
Characteristics of interleukin-4 gene (C-589T, rs2243250) polymorphism in children with bronchial asthma and allergic rhinitis with isolated or allergic rhinitis-induced comorbid malocclusion
Abstract
Purpose. To determine the frequency of interleukin-4 (IL-4) (C-589T, rs2243250) single nucleotide polymorphism in children with bronchial asthma (BA) and allergic rhinitis (AR) and with isolated or allergic rhinitis-induced comorbid malocclusion. Materials and methods. Single nucleotide polymorphism of the IL-4 (C-589T, rs2243250) gene was analyzed in 170 children aged between 6 and 17 years, 11 months, 29 days. Group I included 89 children with BA; Group II consisted of 31 children with AR; Group III was composed of 27 children with AR and distal occlusion (DO); Group ІV comprised 23 children with malocclusion. Genotyping was performed using a commercial “SNP-express RT” kit by real-time polymerase chain reaction method (Applied Biosystems, USA) via TagMan®SNP Genotyping Assay on an amplifier CFX96TM Real-Time PCR Detection System (Bio-Rad Laboratories, Inc.,USA). DNA was isolated using a commercial DNA-express kit (“LLC Research and Production Company LITEKH”). The general, recessive and dominant models of inheritance and the odds ratios with a 95 % confidence interval were used for the analysis. The results analysis was conducted using the Statistica 6.0RU licensed software package. Results. IL-4 (C-589T, rs2243250) gene polymorphism in children with allergy and malocclusion living in Zaporizhzhia was analyzed for the first time. The frequency of C/C – C/T – T/T genotypes registration was 69.66 % – 22.47 % – 7.87 % of cases in children with BA; 58.06 % – 38.71 % – 3.23 % in children with AR; 62.96 % – 29.63 % – 7.40 % in AR with DO. On the contrary, in children with malocclusion, the C/C (34.78 %) and T/T (4.35 %) genotypes were registered less frequently and the C/T genotype (60.87 %) was recorded more often as a genetic feature of the DO phenotype. Conclusions. The C/C genotype of IL-4 (C-589T, rs2243250) gene was associated with bronchial asthma (OR = 4.31; 95 % CI = 1.63–11.36; P = 0.002) and allergic rhinitis (OR = 4.32 (95% CI = 1.04–7.81; P = 0.04), in comparison with the fact that the C/T + T/T genotype indicated a predisposition to malocclusion development.
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