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Lack of association or interactions between the IL-4, IL-4Ra and IL-13 genes, and rheumatoid arthritis

Marinou, I., Till, S.H., Moore, D.J. and Wilson, A.G. (2008) Lack of association or interactions between the IL-4, IL-4Ra and IL-13 genes, and rheumatoid arthritis. Arthritis Research & Therapy, 10 (4). R80. ISSN 1478-6354

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Abstract

INTRODUCTION:

A feature of rheumatoid arthritis (RA) is an imbalance between proinflammatory and anti-inflammatory cytokines. Several recent studies have implicated polymorphism in the IL-4 signalling pathway in the development of erosive RA. The aim of the present study was to investigate the role of polymorphism in the IL-4, IL-4Ra and IL-13 genes in RA, including an examination of epistasis.

METHODS:

A total of 965 Caucasian patients with RA (cases) and 988 healthy control individuals (controls) were genotyped for five variants in the IL-4/IL-13 gene cluster (5q31.1) and two functional variants IL-4Ra (16p12.1). Individual genotype and haplotype frequencies were compared between cases and controls. The odd ratios were calculated with asymptotic 95% confidence intervals, and P values less than 0.05 were considered statistically significant. The potential association with radiological joint damage was also examined. Potential gene interactions were assessed using both stratified analysis and the linkage disequilibrium-based statistic.

RESULTS:

Genotype, allele and haplotype frequencies were equally distributed between RA cases and controls. Similarly, no association was detected between these variants and modified Larsen scores. Furthermore, no evidence of epistasis was detected between IL-4 or IL-13 genotypes and IL-4Ra.

CONCLUSION:

These results indicate that common variants of the IL-4/IL-13 pathway do not significantly contribute to RA susceptibility and radiological severity.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 Marinou et al.; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Academic Units: The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Medicine (Sheffield)
Depositing User: Sheffield Import
Date Deposited: 09 Oct 2009 09:21
Last Modified: 09 Oct 2009 09:21
Published Version: http://arthritis-research.com/content/10/4/R80
Status: Published
Publisher: BioMed Central
Identification Number: 10.1186/ar2454
URI: http://eprints.whiterose.ac.uk/id/eprint/9703

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