The correlation between total immunoglobulin-E levels and interleukin-13 gene polymorphism in asthmatic children treated with inhaled corticosteroids or montelukast

Abstract

Background: The aim of this research was to study the possible correlation between single-nucleotide polymorphism of interleukin (IL)-13-1112 C/T with specific parameters in asthmatic children (total serum immunoglobulin-E [TSIgE] levels and asthma severity) treated with montelukast or inhaled corticosteroid. Methods: The study included one hundred asthmatic patients attending Karbala Teaching Hospital for children and similar numbers of healthy unrelated age-matched controls from the same locality of Iraq. TSIgE levels were determined by ELISA technique. DNA was extracted and processed by the allele-specific polymerase chain reaction technique for characterization of genetic variants of IL-13-1112 C/T gene polymorphisms. Results: Iraqi children with asthma showed a lower frequency of the IL-13-1112 CC genotype (13% vs. 16%) for control cases with a higher frequency of the heterozygous IL-13-1112 CT genotype (78% vs. 75%). IL-13-1112 showed significantly negative association with asthma in the dominant, codominant, and overdominant models of inheritance. On the other hand, comparing genotypes of subgroups related to gender, asthma severity, and asthma control showed a nonsignificant difference (P > 0.05). Homozygous wild types of IL-13-1112 TT might be considered protective to Iraqi asthma children. Conclusion: The IL-13 gene may be associated with the level of control in treated asthmatic patients. There is no correlation between TSIgE and the SNP.

Keywords

• asthma severity
• interleukin-13 1112c/t
• level of control
• total serum immunoglobulin-e