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Association of polar amino acids at position 26 of the HLA-DQB1 first domain with the anticentromere autoantibody response in systemic sclerosis (scleroderma).
J D Reveille, … , R A Isern, F C Arnett
J D Reveille, … , R A Isern, F C Arnett
Published April 1, 1992
Citation Information: J Clin Invest. 1992;89(4):1208-1213. https://doi.org/10.1172/JCI115704.
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Research Article

Association of polar amino acids at position 26 of the HLA-DQB1 first domain with the anticentromere autoantibody response in systemic sclerosis (scleroderma).

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Abstract

HLA class II alleles (detected by DNA typing) were determined in 116 Caucasians with systemic sclerosis positive and negative for anticentromere autoantibodies (ACA). Significantly increased frequencies of HLA-DR5(DRw11) (P = 0.009) and the Dw13(DRB1*0403, *0407) subtypes of DR4 (probability corrected, Pc = 0.005) were seen in ACA positive patients, and HLA-DR1 and DRw8 were also increased. These findings appeared to reflect linkage disequilibrium of DR5(DRw11) and many DR4(Dw13) haplotypes with HLA-DQw7 and DR1 with DQw5. In fact, the presence of a DQB1 allele having a polar glycine or tyrosine at position 26 of the DQB1 first domain versus a hydrophobic leucine accounted for 100% of ACA positive Caucasian systemic sclerosis patients compared to 69% of the ACA negative SS patients (P = 0.0008) and 71% of Caucasian controls (P = 0.0003) as well as all 7 ACA patients of non-Caucasian background. Furthermore, the genotype frequency of DQB1 alleles lacking leucine at position 26 was 73% in ACA positive SS patients, compared to 42% of ACA negative patients (P = 1.2 x 10(-5)) and 38% of controls (P = 5.8 x 10(-7)). These data, then, suggest that the second hypervariable region of the HLA-DQB1 chain may form the candidate epitope associated with the ACA response.

Authors

J D Reveille, D Owerbach, R Goldstein, R Moreda, R A Isern, F C Arnett

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