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Cytokine gene polymorphisms and susceptibility to juvenile idiopathic arthritis
Donn, RP, Barrett,J.H., Farhan,A., Stopford,A., Pepper,L., Shelley,E., Davies,N., Ollier, WER, Thomson, W, British Paediatric Rheumatology Study Group
Arthritis and Rheumatism. 2001;44, 4:802-810.
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Abstract
OBJECTIVE: To investigate the involvement of candidate cytokine genes in the pathogenesis of juvenile idiopathic arthritis (JIA). METHODS: Single nucleotide polymorphisms and intragenic microsatellite markers within 8 candidate cytokine genes (interleukin-1alpha [IL-1alpha], IL-2, IL-4, IL-6, IL-10, interferon-alpha1 [IFNA1], interferon-gamma [IFNG], and interferon regulatory factor 1 [IRF-1]) were investigated in 417 Caucasian patients with clinically characterized JIA and a panel of 276 unrelated, healthy Caucasian controls, all from the United Kingdom. RESULTS: A novel 3'-untranslated region (3'UTR) polymorphism in IRF-1 was found to be associated with susceptibility to JIA (corrected P = 0.002). No significant association with IL-1alpha, IL-2, IL-4, IL-6, IL-10, IFNA1, or IFNG was observed. CONCLUSION: An association between JIA and a previously unreported 3'UTR polymorphism of IRF-1 was observed. This association was not found to be specific to any particular JIA subgroup. This suggests that IRF-1 may contribute to a common pathogenesis shared by all JIA patients, regardless of clinical phenotype. This is most likely to be a genetic contribution to the chronic inflammatory process that underlies JIA pathology