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. 2015 Dec;142(6):675-80.
doi: 10.4103/0971-5916.174551.

A preliminary study on the association of single nucleotide polymorphisms of interleukin 4 (IL4), IL13, IL4 receptor alpha (IL4Rα) & Toll-like receptor 4 (TLR4) genes with asthma in Indian adults

Parisa Davoodi, P A Mahesh, Amrutha D Holla, Nallur B Ramachandra  1
Affiliations

A preliminary study on the association of single nucleotide polymorphisms of interleukin 4 (IL4), IL13, IL4 receptor alpha (IL4Rα) & Toll-like receptor 4 (TLR4) genes with asthma in Indian adults

Parisa Davoodi et al. Indian J Med Res. 2015 Dec.

Abstract

Background & objectives: Interleukin 4 (IL4) and IL13 genes are believed to be responsible for inflammation of the airways in asthmatics. These share a common receptor component called IL4Rα which is another potentially important candidate gene linked to asthma phenotypes. Another gene Toll-like receptor 4 (TLR4) might affect the incidence or progression of asthma through the expression of proinflammatory genes. Several single nucleotide polymorphisms (SNPs) in IL4, IL13, IL4Rα and TLR4 have been reported to be linked to asthma or related phenotypes in several ethnic populations using linkage studies and association studies. However, the results have not been consistent. We investigated five SNPs (C-589T and C-33T of IL4, G+2044A of IL13, A+1902G of IL4Rα, and A+896G of TLR4) in patients with adult onset asthma to evaluate their role in manifestation and severity of asthma.

Methods: Adult (>18 yr of age) patients with asthma (n=100) and healthy controls (n=50) were included in the study. Genotyping was performed using sequenom MassARRAY technology.

Results: The mutant alleles of the C-589T and C-33T SNPs in the promoter region of IL4 were present in 4 per cent patients with asthma but absent from the control group suggesting that the variations in IL4 may contribute to asthma occurrence. The SNPs of other genes were seen in both controls and patients.

Interpretation & conclusions: The results suggest the possible association between the genetic distribution of C-589T and C-33T SNPs of IL4 with asthma in Indian adults.

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Figures

Fig. 1
Fig. 1
Schematic representation of interleukin 4 (IL4), IL13, IL4Rα and Toll-like receptor 4 genes (TLR4) showing their structural organization (filled boxes represent the exons) and the location of the SNPs genotyped in this study.
Fig. 2
Fig. 2
Distribution of normal homozygous (N.HOM), heterozygous (HET) and mutant homozygous (M.HOM) genotypes of five SNPs of IL4, IL4R, IL13 and TLR4 in mild, moderate and severe asthmatic patients
See this image and copyright information in PMC

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