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Clin Exp Allergy. 2017 Aug;47(8):1032-1037. doi: 10.1111/cea.12942. Epub 2017 May 21.

Genetic variation at the Th2 immune gene IL13 is associated with IgE-mediated paediatric food allergy.

Author information

1
Murdoch Childrens Research Institute, Royal Children's Hospital, Australia.
2
The Hudson Institute, Monash Translational Health Precinct (MTHP), Monash University, Clayton, Australia.
3
Department of Immunology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Malaysia.
4
Department of Paediatrics, University of Melbourne, Parkville, Australia.
5
Department of Allergy and Immunology, Royal Children's Hospital, Parkville, Australia.
6
Institute of Inflammation and Repair, University of Manchester, UK.
7
Barwon Health, Child Health Research Unit, Geelong, Australia.
8
Deakin University, Waurn Ponds, Australia.
9
Centre for Epidemiology and Biostatistics, School of Population and Global Health, The University of Melbourne, Melbourne, Australia.
10
Centre for Social and Early Emotional Development, Faculty of Health, Deakin University, Australia.
11
University of Western Australia, Department of Paediatrics, Australia.

Abstract

BACKGROUND:

Food allergies pose a considerable world-wide public health burden with incidence as high as one in ten in 12-month-old infants. Few food allergy genetic risk variants have yet been identified. The Th2 immune gene IL13 is a highly plausible genetic candidate as it is central to the initiation of IgE class switching in B cells.

OBJECTIVE:

Here, we sought to investigate whether genetic polymorphisms at IL13 are associated with the development of challenge-proven IgE-mediated food allergy.

METHOD:

We genotyped nine IL13 "tag" single nucleotide polymorphisms (tag SNPs) in 367 challenge-proven food allergic cases, 199 food-sensitized tolerant cases and 156 non-food allergic controls from the HealthNuts study. 12-month-old infants were phenotyped using open oral food challenges. SNPs were tested using Cochran-Mantel-Haenszel test adjusted for ancestry strata. A replication study was conducted in an independent, co-located sample of four paediatric cohorts consisting of 203 food allergic cases and 330 non-food allergic controls. Replication sample phenotypes were defined by clinical history of reactivity, 95% PPV or challenge, and IL13 genotyping was performed.

RESULTS:

IL13 rs1295686 was associated with challenge-proven food allergy in the discovery sample (P=.003; OR=1.75; CI=1.20-2.53). This association was also detected in the replication sample (P=.03, OR=1.37, CI=1.03-1.82) and further supported by a meta-analysis (P=.0006, OR=1.50). However, we cannot rule out an association with food sensitization. Carriage of the rs1295686 variant A allele was also associated with elevated total plasma IgE.

CONCLUSIONS AND CLINICAL RELAVANCE:

We show for the first time, in two independent cohorts, that IL13 polymorphism rs1295686 (in complete linkage disequilibrium with functional variant rs20541) is associated with challenge-proven food allergy.

KEYWORDS:

IL13 ; Immunoglobulin E; food allergy; food sensitization; interleukin-13; single nucleotide polymorphism

PMID:
28544327
DOI:
10.1111/cea.12942
[Indexed for MEDLINE]

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