Abstract
This study further defines genetic susceptibility to JIA in the region centromeric to HLA-DRB1. DNA from 234 Finnish JIA nuclear families and 639 elderly Finnish control individuals was genotyped for five functional SNPs within the TAP2 and TAP1 loci (∼200 kb centromeric of HLA-DRB1). Subsets of the controls (186) and patients (145) that had been previously typed for HLA-DRB1 were also genotyped by sequence for the HLA-DPB1 locus. Case/control and transmission disequilibrium test (TDT) methods revealed an association with the DPB1*030101 allele for JIA (OR 2.3, 95% CI 1.5–3.5). Notably, a detailed haplotypic analysis of the TAP2/TAP1 loci and their interaction with the HLA-DPB1*030101 and DRB1*08 and *11 alleles showed a variety of over-represented and under-represented TAP2/TAP1 haplotypes not evident in the single marker analysis. The strongest effect was observed in the polyarticular RF negative JIA subgroup for the 2-2-1-2-1 TAP2/TAP1 haplotype (TAP2B and TAP1A alleles) which showed an independent effect from both DRB1*08 and *11 (P<0.000003) and DPB1*030101 (P=0.02). We have provided evidence that the extended haplotypes (including HLA-DRB1, TAP2/TAP1, and HLA-DPB1) of pauciarticular and polyarticular RF negative disease are distinct. This observation may have implications for functional etiological differences between the pauciarticular and polyarticular JIA patients.
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Acknowledgements
Dr Runstadler was supported by an NRSA postdoctoral fellowship as a part of the training grant in Comparative Medicine at the University of California, Davis. This work was supported in part by NIH Grant #AR44422, the Academy of Finland (Grant 46558), the Päivikki and Sakari Sohlberg Foundation, the EVO funds of the Rheumatism Association Hospital, and the Helsinki University Central Hospital Research Fund.
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Runstadler, J., Säilä, H., Savolainen, A. et al. HLA-DRB1, TAP2/TAP1, and HLA-DPB1 haplotypes in Finnish juvenile idiopathic arthritis: more complexity within the MHC. Genes Immun 5, 562–571 (2004). https://doi.org/10.1038/sj.gene.6364129
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DOI: https://doi.org/10.1038/sj.gene.6364129
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