Association of the TAP2*Bky2 allele with presence of SS-A/Ro and other autoantibodies in Japanese patients with systemic lupus erythematosus

Abstract

We previously reported that a new allele of transporter associated with antigen processing (TAP) 2 gene, TAP2*Bky2 (Val⁵⁷⁷), was significantly increased in Japanese patients with Sjögren’s syndrome (SS) and had a strong association with SS-A=Ro antibody production. In the present study, it was investigated whether the association of TAP2*Bky2 with SS-A=Ro antibody production was also found in Japanese patients with systemic lupus erythematosus (SLE). Polymorphisms of the TAP1 and TAP2 genes were determined in 114 Japanese SLE patients by the polymerase chain reaction-single-stranded conformation polymorphism (PCR-SSCP) method. The allele frequencies of the TAP1 and TAP2 genes in SLE patients were not significantly different from those in controls, although the allele frequency of TAP2*Bky2 was slightly higher in SLE patients than in healthy control subjects (9.2% vs 5.5%, P = 0.126). The allele frequency of TAP2*Bky2 was significantly higher in SLE patients with oral ulcers than in those without. It was noteworthy that TAP2*Bky2 was significantly associated with the appearance of not only SS-A=Ro antibody but also SS-B=La, nRNP, and Sm antibodies in the patients. The association of TAP2*Bky2 was found with the antibody production to both 60 and 52 kDa SS-A=Ro antigens. As TAP2*Bky2 had a strong linkage disequilibrium with DRB1*08032, TAP2*Bky2 or its haplotype with DRB1*08032 may be involved in SS-A=Ro antibody production not only in SS but also SLE patients, indicating that TAP2*Bky2 may be a susceptible gene not only to the disease of SS but also to the SS-A=Ro autoantibody production.

Keywords

TAP polymorphism SLE SS-A=Ro antibody

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