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  • Title: Genetic variants of the IL-23R pathway: association with psoriatic arthritis and psoriasis vulgaris, but no specific risk factor for arthritis.
    Author: Hüffmeier U, Lascorz J, Böhm B, Lohmann J, Wendler J, Mössner R, Reich K, Traupe H, Kurrat W, Burkhardt H, Reis A.
    Journal: J Invest Dermatol; 2009 Feb; 129(2):355-8. PubMed ID: 18800148.
    Abstract:
    Variants in two genes of the IL-23 receptor (R) pathway have recently been shown to be associated with psoriasis vulgaris (PV). We were interested whether the risk conferred by these variants differs between psoriatic skin and joint disease. Four variants of the IL12B and IL23R genes were analyzed in 1,114 PV patients, 748 patients with psoriatic arthritis (PA) and 937 healthy controls before and after stratification for the major psoriasis risk allele at psoriasis susceptibility locus 1 (PSORS1). For both PA and PV, we detected the strongest association with two IL12B single-nucleotide polymorphisms and the corresponding haplotype as reflected by minimal P-values of 10(-7) and highest odds ratios of 1.50 (1.28-1.75) for rs6887695 in PA patients and 1.50 (1.27-1.76) for rs3212227 in the PV cohort, respectively. For IL23R, only rs11209026 showed an association. The results remained significant after correction for multiple testing. No difference was observed after stratification for the PSORS1 risk allele. While confirming recent reports on variants of the IL-23R pathway as susceptibility factors for PV, our study is the first to extend analysis of both genes to PA. However, our results indicate that these variants are not specific risk factors for arthritis, but relevant for susceptibility to psoriasis in general.
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