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  • Title: Interleukin-10 promoter microsatellite polymorphisms in systemic lupus erythematosus: association with the anti-Sm immune response.
    Author: Schotte H, Gaubitz M, Willeke P, Tidow N, Assmann G, Domschke W, Schlüter B.
    Journal: Rheumatology (Oxford); 2004 Nov; 43(11):1357-63. PubMed ID: 15304673.
    Abstract:
    OBJECTIVES: Overproduction of interleukin-10 (IL-10) is a pivotal feature in the pathophysiology of systemic lupus erythematosus (SLE). In vitro IL-10 secretion has previously been related to haplotypes of the IL-10 promoter microsatellite polymorphisms IL10.R and IL10.G. Published data concerning the association of IL10.G alleles with susceptibility to SLE are inconsistent in different ethnic populations. We analysed the association of IL-10 promoter microsatellite polymorphisms with disease susceptibility and manifestations in German Caucasian patients with SLE. METHODS: Two hundred and ten (210) SLE patients fulfilling the 1997 revised ACR criteria and 158 ethnically, age- and sex-matched healthy controls were genotyped for the IL-10 promoter microsatellite polymorphisms by fragment length analysis. Haplotypes were reconstructed using a Bayesian coalescent theory-based method with PHASE software. Allele and haplotype distributions were compared between patients and controls and between subgroups of patients with different clinical and immunopathological findings. RESULTS: In the study population no significant associations of individual IL10.R and G alleles or their haplotypes with susceptibility to SLE or major clinical manifestations were observed. By contrast, alleles G14 and G15 and haplotypes R2-G14 and R2-G15 were significantly over-represented in anti-Sm antibody-positive patients. CONCLUSIONS: The IL-10 promoter microsatellite polymorphisms and their haplotypes do not constitute a major risk factor for SLE in German Caucasians. However, the identification of genetic markers such as the IL-10 high-response haplotype R2-G14 predisposing for the production of anti-Sm antibodies may help to elucidate the conditions that lead to the development of SLE.
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