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Journal of Clinical Endocrinology & Metabolism, Vol 77, 606-610, Copyright © 1993 by Endocrine Society

ARTICLES

Apparent genetic difference between hypothyroid patients with blocking- type thyrotropin receptor antibody and those without, as shown by restriction fragment length polymorphism analyses of HLA-DP loci

D Inoue, K Sato, H Sugawa, T Akamizu, M Maeda, H Inoko, K Tsuji and T Mori
Department of Laboratory Medicine, Kyoto University School of Medicine, Japan.

HLA types in Japanese patients with primary hypothyroidism were analyzed to see whether those with blocking-type TSH receptor antibody (TSH-R BAb M) differed genetically from those with idiopathic myxedema (IM). HLA typings of -A, -B, -C, -DR, and -DQ (73 antigens) were performed serologically, and those of -D and -DP (29 antigens) were analyzed by the restriction fragment length polymorphism method. Thirty patients were studied with TSH-R BAb M, and 28 with IM. The data were analyzed and compared with our previous results from 88 Graves' patients, 46 Hashimoto patients, and 186 control subjects. Overall, 192 patients with 4 autoimmune thyroid disorders showed a decrease in -Aw19 and an increase in -DQw4 (corrected P < 0.05) and significant associations of -Aw33, -Bw46, -Cw3, -DRw8, -DR9, and -DQw3. In TSH-R BAb M patients, increases in -B35, -Bw60, and -Dw8 and decreases in - DR4 and -DPw2 were seen, whereas IM patients showed increased -DPw2, - Bw61, and -Dw23. In comparisons between TSH-R BAb M and IM, the difference in -DPw2 was highly significant. HLA-B35 differed significantly in these 2 types of hypothyroidism. In conclusion, TSH-R BAb M patients have decreased frequency of -DPw2 and are genetically similar to Graves' disease, whereas IM patients are characterized by high frequency of -DPw2 and are genetically similar to Hashimoto's thyroiditis.


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