Volume 46, Issue 12 pp. 3304-3311
Research Article

Linkage and association studies of single-nucleotide polymorphism–tagged tumor necrosis factor haplotypes in juvenile oligoarthritis

Eleftheria Zeggini

Corresponding Author

Eleftheria Zeggini

Arthritis Research Campaign Epidemiology Unit, University of Manchester, Manchester, UK

Eleftheria Zeggini's work was supported by the Arthritis Research Campaign.

ARC/EU, Stopford Building, Oxford Road, Manchester M13 9PT, UKSearch for more papers by this author
Wendy Thomson

Wendy Thomson

Arthritis Research Campaign Epidemiology Unit, University of Manchester, Manchester, UK

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Dominic Kwiatkowski

Dominic Kwiatkowski

Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, UK

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Anna Richardson

Anna Richardson

Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, UK

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William Ollier

William Ollier

Arthritis Research Campaign Epidemiology Unit, University of Manchester, Manchester, UK

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Rachelle Donn

Rachelle Donn

Arthritis Research Campaign Epidemiology Unit, University of Manchester, Manchester, UK

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The British Paediatric Rheumatology Study Group

The British Paediatric Rheumatology Study Group

Contributors to The British Paediatric Rheumatology Study Group are as follows: M. Abinun, MD, M. Becker, MD, A. Bell, MD, A. Craft, PhD, E. Crawley, MD, J. David, MD, H. Foster, MD, J. Gardener-Medwin, MD, J. Griffin, MD, A. Hall, MD, M. Hall, MD, A. Herrick, MD, P. Hollingworth, MD, L. Holt, MD, S. Jones, MD, G. Pountain, MD, C. Ryder, MD, T. Southwood, PhD, I. Stewart, MD, P. Woo, PhD, S. Wyatt, MD, H. Venning, MD.

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First published: 12 December 2002
Citations: 59

Abstract

Objective

The presence of increased levels of tumor necrosis factor (TNF) in serum and synovial fluid of patients and the encouraging outcome of anti-TNF therapy have implicated TNFα in the etiopathogenesis of juvenile oligoarthritis. Although the locus is polymorphic, no study has investigated all TNF single-nucleotide polymorphisms (SNPs) with respect to disease. The aim of this study was to examine the association of multiple TNF SNPs with juvenile oligoarthritis and to construct and analyze SNP-tagged TNF haplotypes.

Methods

A total of 144 simplex families consisting of parent and affected child, as well as 88 healthy, unrelated control subjects were available for study. In these individuals, 9 polymorphic positions of TNF were typed by a high-throughput genotyping method based on the SNaPshot assay. The chi-square and extended transmission disequilibrium tests were used to test for association and linkage, respectively. Odds ratios (ORs) with 95% confidence intervals (95% CIs) were also calculated. Haplotype-tagging SNPs (htSNPs) for the locus were identified by ordering the haplotypes according to their frequencies.

Results

The study detected association of several TNF SNPs and established linkage of the locus to juvenile oligoarthritis. The most significant association observed was between the intronic +851 TNF SNP and the persistent oligoarthritis subgroup (OR 3.86, 95% CI 1.6–9.2). Haplotype data mining showed that only 4 of the 9 SNPs need to be typed in order to capture the most frequent TNF haplotypes.

Conclusion

The TNF locus is linked and associated with juvenile oligoarthritis. Information on the htSNPs can be useful in genetic studies of diseases in which TNF may be of relevance.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.

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