Functional Significance of Single-Nucleotide Polymorphism (rs11204981) in Filaggrin (flg) Gene for the Treatment of Bronchial Asthma in Children with Atopic Dermatitis

Abstract

Objective. The objective of this study was to determine the correlation between single-nucleotide polymorphism in filaggrin gene and expression of filaggrin mRNA in buccal epithelium and the phenotype of bronchial asthma with atopic dermatitis in medical history of children. Methods. Filaggrin genotyping (rs11204981) was carried out in group of patients with bronchial asthma and control group using real-time polymerase chain reaction (PCR). The level of mRNA expression was assessed by reverse transcription and subsequent real-time PCR. Results. We have found that 5 % of patients in the study group and 2 % in the control group had a minor allele (AA), 27 and 36 %, respectively, — heterozygous allele (GA), 67 and 61 % — major allele (GG). Variants with the AA genotype of the FLG rs11204981 were found 2.4 times more often in patients from the study group than in controls. Heterozygous variant had significantly higher expression in filaggrin in buccal epithelium. Conclusions. We believe that polymorphism in filaggrin gene (rs11204981) can serve as an important prognostic marker for the phenotype of bronchial asthma and atopic dermatitis, and that high levels of expression in the heterozygous state may indicate the protective role of this genotype in the development of allergy.

Keywords

• single-nucleotide polymorphism
• filaggrin
• asthma
• pediatrics.