Analysis of HLA-DRB3 alleles and supertypical genotypes in the MHC Class II region in sporadic inclusion body myositis
2013
We compared the carriage frequencies of HLA-DRB3 and its major alleles and of HLA-DRB4 and HLA-DRB5 in an Australian sIBM cohort and a population control group who had previously been genotyped for the HLA-DRB1*03:01 risk allele. There was a strong disease association with the carriage of the DRB3*01:01 allele which was accounted for by its linkage disequilibrium with DRB1*03:01. The carriage of HLA-DRB4 was found to be strongly protective and abrogated the risk effect of HLA-DRB1*03:01. The findings indicate that haplotypic combinations of alleles at the HLA-DRB1 and secondary HLA-DRB loci have important risk modifying effects in sIBM.
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