Association of tap2 polymorphism with rheumatoid arthritis is secondary to allelic association with hla–drb1

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Abstract
Objective. To study polymorphisms of the newly described TAP2 locus in rheumatoid arthritis (RA) and to analyze their relationship with HLA–DRB1 alleles previously implicated in the development of the disease. Methods. TAP2 polymorphic residues at 3 sites, Val/Ile‐379, Ala/Thr‐565, and Ala/Thr‐665, were characterized by amplification refractory mutation system polymerase chain reaction in 185 RA patients and 48 HLA–DR4 positive healthy controls. HLA‐DR4 subtypes were determined by sequence‐specific priming and oligonucleotide hybridization. Results. The frequencies of Ile‐379, Thr‐565, and Thr‐665 were significantly increased in DR4 positive versus DR4 negative RA patients. TAP2 genotype distributions also differed between the patient groups stratified by DR4 status. However, no significant differences in TAP2 polymorphisms were observed between DR4 positive RA patients and DR4 positive controls, although relationships between specific DR4 subtypes and TAP2 variants were identified. Conclusion. Particular TAP2 polymorphisms are associated with distinct HLA–DR specificities in both normal and RA populations. Thus, the prevalence of specific TAP2 residues and genotypes in RA appears to be secondary to the HLA–DR frequencies and genotypic combinations that are typical of RA.

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