| 1. |
- Kozyrev, Sergey V, et al.
(författare)
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Functional variants in the B-cell gene BANK1 are associated with systemic lupus erythematosus
- 2008
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Ingår i: Nature Genetics. - : Springer Science and Business Media LLC. - 1546-1718 .- 1061-4036. ; 40:2, s. 211-216
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Tidskriftsartikel (refereegranskat)abstract
- Systemic lupus erythematosus (SLE) is a prototypical autoimmune disease characterized by production of autoantibodies and complex genetic inheritance(1-3). In a genome-wide scan using 85,042 SNPs, we identified an association between SLE and a nonsynonymous substitution (rs10516487, R61H) in the B-cell scaffold protein with ankyrin repeats gene, BANK1. We replicated the association in four independent case-control sets (combined P = 3.7 x 10(-10); OR = 1.38). We analyzed BANK1 cDNA and found two isoforms, one full-length and the other alternatively spliced and lacking exon 2 (Delta 2), encoding a protein without a putative IP3R-binding domain. The transcripts were differentially expressed depending on a branch point-site SNP, rs17266594, in strong linkage disequilibrium (LD) with rs10516487. A third associated variant was found in the ankyrin domain (rs3733197, A383T). Our findings implicate BANK1 as a susceptibility gene for SLE, with variants affecting regulatory sites and key functional domains. The disease-associated variants could contribute to sustained B cell-receptor signaling and B-cell hyperactivity characteristic of this disease.
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| 2. |
- Sánchez, Fabio O, et al.
(författare)
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IFN-Regulatory Factor 5 Gene Variants Interact with the Class I MHC Locus in the Swedish Psoriasis Population
- 2008
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Ingår i: Journal of Investigative Dermatology. - : Elsevier BV. - 0022-202X .- 1523-1747. ; 128:7, s. 1704-1709
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Tidskriftsartikel (refereegranskat)abstract
- Psoriasis is a multifactorial disease of the skin with significant comorbidities of the musculoskeletal and cardiovascular system, which affects 2-3% of the Caucasian population. Failure to regulate prolonged T-helper 1-mediated inflammation is central to psoriasis and is a feature shared with other inflammatory diseases. IFNs are important initiators/regulators of inflammation that among other things can affect the expression of the main genetic determinant in psoriasis, namely HLA-C. Externally administered IFN-alpha, as in patients treated for viral infections, and IFN-alpha produced by plasmacytoid dendritic cells is a known trigger of psoriasis. IFN gamma is characteristically increased in psoriasis lesions. Expression of IFNs is controlled by factors such as IFN-regulatory factor 5 (IRF5) whose polymorphic haplotypes were recently found to associate with increased risk of systemic lupus erythematosus (SLE). The hypothesis underlying this study was that polymorphisms in the IRF5 gene contribute to inadequate control of inflammation in psoriasis. This hypothesis was tested by comparing the distribution of genotypes and haplotypes at IRF5 derived from genotyping single-nucleotide polymorphisms (SNPs) rs2004640, rs2070197, rs10954213, and rs2280714 in psoriasis patients and population-matched controls from the Stockholm Psoriasis Cohort. Polymorphisms at IRF5 did not associate with psoriasis per se; however, an interaction with class I major histocompatibility complex (MHC) genes was found.
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