Summary
Although HLA-DQB1 alleles encoding aspartic acid at position 57 (Asp-57) are protective against Type 1(insulin-dependent) diabetes mellitus in Caucasians, most Japanese Type 1 diabetic patients carry at least one Asp-57 DQB1 allele. We analysed the DRB1, DQA1 and DQB1 genes of 99 Japanese patients and 86 control subjects with polymerase chain reaction and sequence-specific oligonucleotide hybridization. We found that (1) the DQA1*0301 allele was significantly increased in Type 1 diabetic patients (RR 7.8,pc < 0.0001); (2) the DRB1*0405 (Dw15) allele, which is a subtype of DR4 haplotype, was significantly increased in DR4-positive patients (RR 12.0,pc < 0.001); and (3) although the DRw8-DQw8 haplotype was positively associated with Type 1 diabetes, the DRBl*0406-DQw8 haplotype was decreased in the diabetic patients. These data indicate that DRB 1 and DQA1 genes also confer susceptibility to Type 1 diabetes in Japanese.
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Awatal, T., Kuzuyal, T., Matsuda, A. et al. Genetic analysis of HLA class II alleles and susceptibility to Type 1 (insulin-dependent) diabetes mellitus in Japanese subjects. Diabetologia 35, 419–424 (1992). https://doi.org/10.1007/BF02342437
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DOI: https://doi.org/10.1007/BF02342437