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Wnt-1-inducible signaling pathway protein 3 and susceptibility to juvenile idiopathic arthritis.

Lamb R, Thomson W, Ogilvie E, Donn RP

Arthritis Rheum. 2005;52( 11):3548-3553.

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OBJECTIVE: To determine whether Wnt-1-inducible signaling pathway protein 3 (WISP3) polymorphisms are associated with susceptibility to juvenile idiopathic arthritis (JIA). METHODS: The exons and the intron/exon boundaries of the WISP3 gene were mutation-screened by denaturing high-performance liquid chromatography in 86 patients with polyarticular-course JIA (>/=5 joints affected) and 15 controls. Seven single-nucleotide polymorphisms (SNPs) were genotyped, using allelic discrimination, in a case-control study. Initially, 159 patients with polyarticular-course JIA and 263 controls were studied, followed by study of a replication cohort of 181 patients with polyarticular-course JIA and 355 controls. Available parents of patients with polyarticular-course JIA were also genotyped. Finally, other JIA subgroups were studied (initial cohort, n = 218; replication cohort, n = 213). Single-point and haplotype analysis was carried out. RESULTS: Positive association with SNP WISP3*G84A was observed and replicated in 2 cohorts of patients with polyarticular-course JIA. Specifically, homozygosity of the mutant allele (WISP3*84AA) conferred a 2-fold increased risk of disease susceptibility (for the initial cohort, odds ratio [OR] 2.1, 95% confidence interval [95% CI] 1.1-4.2, P = 0.03; for the replication cohort, OR 2.0, 95% CI 1.0-4.3, P = 0.05). Strong linkage disequilibrium was observed between SNPs; however, no haplotypic effect of an order of magnitude greater than the single-point WISP3*G84A association was observed. Using the transmission disequilibrium test, a trend toward overtransmission of the WISP3*84A allele was observed in patients with polyarticular-course JIA. No association of any WISP3 polymorphism was observed in the other JIA subgroups. CONCLUSION: Association and replication of a polymorphism within the first intron of the WISP3 gene have been shown in patients with polyarticular-course JIA. The functional significance of the WISP3*G84A SNP is being determined.

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52( 11)
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29th August, 2009, 16:10:45
Last modified:
20th September, 2015, 12:12:00

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