Original article
Asthma and rhinitis have different genetic profiles for IL13, IL17A and GSTP1 polymorphisms
E.P. Resendea,, , A. Todo-Bomb,d, C. Loureirob, A. Mota Pintoc,d, B. Oliveirose, L. Mesquitaa, H.C. Silvaa,d
a Genetics Institute, Faculty of Medicine, University of Coimbra, Portugal
b Immunoallergology Department, Coimbra University Hospital, Portugal
c Laboratory of General Pathology, Faculty of Medicine, University of Coimbra, Portugal
d CIMAGO – Centre of Investigation of Environment, Genetics and Oncobiology, Coimbra, Portugal
e Laboratory for Biostatistics and Medical Informatics, Faculty of Medicine, University of Coimbra, Portugal
Received 29 March 2016, Accepted 27 June 2016
Abstract
Background

Asthma and rhinitis have a complex etiology, depending on multiple genetic and environmental risk factors. An increasing number of susceptibility genes are currently being identified, but the majority of reported associations have not been consistently replicated across populations of different genetic backgrounds.

Purpose

To evaluate whether polymorphisms of IL4R (rs1805015), IL13 (rs20541), IL17A (rs2275913) and GSTP1 (rs1695) genes are associated with rhinitis and/or asthma in adults of Portuguese ancestry.

Methods

192 unrelated healthy individuals and 232 patients, 83 with rhinitis and 149 with asthma, were studied. All polymorphisms were detected by real time polymerase chain reaction (PCR) using TaqMan assays.

Results

Comparing to controls, significant association with asthma was observed for GSTP1 rs1695 AA genotype (odds ratio (OR) – 1.96; 95% CI – 1.18 to 3.25; p=0.010). The association sustains for allergic asthma (OR – 2.17; 95% CI – 1.23 to 3.80; p=0.007). IL13 rs20541 GG genotype was associated with less susceptibility to asthma (OR – 0.55, 95% CI – 0.33 to 0.94, p=0.028). Among patients, IL17A rs2275913 AA genotype was less associated with asthma than with rhinitis (OR – 0.20; 95% CI of 0.07 to 0.56; p=0.002). A similar association was found for IL13 rs20541 GG genotype (OR – 0.48; 95% CI of 0.25 to 0.93; p=0.031). There were no significant differences in the distribution of allelic and genotypic frequencies between patients and controls for the IL4R polymorphism’ analyzed.

Conclusion

These results support the existence of a significant association between GSTP1 rs1695 and IL13 rs20541 SNPs, with susceptibility to asthma, in the population studied. Different genotype profiles of IL17A and IL13 genes seem to influence the clinical pattern of disease expression mainly confined to the upper airways, as rhinitis, or including the lower airways, as asthma.

Keywords
Asthma, Rhinitis, Allergy, IL4R, IL13, IL17A, GSTP1, Genetic polymorphism, Genetic profile

Metrics

  • Impact Factor: 1.357(2015)
  • 5-years Impact Factor: 0,841
  • SCImago Journal Rank (SJR):0,29
  • Source Normalized Impact per Paper (SNIP):0,685