Analysis of the IL28RA locus as genetic risk factor for multiple sclerosis.

Recently, we reported an association between a SNP in IL28RA and MS. Here, we performed a fine-mapping of the IL28RA locus by genotyping 10 haplotype-tagging SNPs in a Basque-Spanish population. In addition, based on shared genetic risk loci between autoimmune diseases, a psoriasis-associated SNP located at this locus, rs4649203, was genotyped in four independent populations, comprising a total of 2582 cases and 2614 controls. We did not find any consistent association between IL28RA and MS in these populations, suggesting that, although it may play a role in other autoimmune diseases, this gene is unlikely of general relevance to MS pathogenesis.