Abstract
Hashimoto’s thyroiditis (HT) is an autoimmune disease of the thyroid gland, and like many other autoimmune diseases, it is associated with the HLA and CTLA-4 gene. We have examined the distribution of the HLA DRB4*0101 allele and a CTLA-4 exon 1 A/G polymorphism in Japanese HT patients and controls and investigated possible interactions of these genes with thyroid function. Seventy Japanese HT patients and 105 controls were included in this study. HT was diagnosed on the basis of positivity for thyroid peroxidase (TPO) autoantibodies and the presence of a palpable diffuse goiter. Genotyping was performed by polymerase chain reaction (PCR)-based methods. CTLA-4-GG or -AG was more prevalent in the patients, and the odds ratio for the G allele was 4.95. The frequency of DRB4*0101-positive individuals was significantly higher in HT (odds ratio=2.17). The TSH values of HT patients at the time of diagnosis were compared to CTLA-4 genotype and HLA-DRB4*0101 positivity. They were slightly higher in the CTLA-4-AG group than in the -GG group and significantly higher in the HLA-DRB4*0101-positive group than in the -negative group (p<0.01). When the TSH values were compared in 4 groups based on positivity or negativity for HLA-DRB4*0101 and CTLA-4 GG or AG, they were found to be significantly higher in the CTLA-4-AG and HLADRB4* 0101-positive group than in the 3 other groups (F=5.75, 3 degrees of freedom, p<0.01). These findings suggest that the interaction between the HLA-DRB4 and CTLA-4 genes determines the thyroid function of TPO-positive goitrous Japanese HT patients.
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Terauchi, M., Yanagawa, T., Ishikawa, N. et al. Interactions of HLA-DRB4 and CTLA-4 genes influence thyroid function in Hashimoto’s thyroiditis in Japanese population. J Endocrinol Invest 26, 1208–1212 (2003). https://doi.org/10.1007/BF03349159
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DOI: https://doi.org/10.1007/BF03349159