Journal of Clinical Endocrinology & Metabolism, Vol 73, 990-994, Copyright © 1991 by Endocrine Society

ARTICLES

Homozygosity for a dominant negative thyroid hormone receptor gene responsible for generalized resistance to thyroid hormone

S Ono, ID Schwartz, OT Mueller, AW Root, SJ Usala and BB Bercu
Department of Pediatrics, University of South Florida College of Medicine, Tampa 33612.

Generalized resistance to thyroid hormones (GRTH) commonly results from mutations in the T3-binding domain of the c-erbA beta thyroid hormone receptor gene. We have reported on a novel deletion mutation in c-erbA beta in a kindred, S, with GRTH. One patient from this kindred was the product of a consanguineous union from two affected members and was homozygous for the beta-receptor defect. This patient at 3.5 weeks of age had unprecedented elevations of TSH, free T4, and free T3 (TSH, 389 mU/L; free T4, 330.8 pmol/L; free T3, 82,719 fmol/L). He displayed a complex mixture of tissue-specific hyperthyroidism and hypothyroidism. He had delayed growth (height age, 1 3/12 yr at chronological age 2 9/12 yr) and skeletal maturation (bone age, 4 months), and developmental delay (developmental age, 8 months), but he was quite tachycardic. The homozygous patient of kindred S is markedly different from a recently reported patient with no c-erbA beta-receptor. This difference indicates that a dominant negative form of c-erbA beta in man can inhibit at least some thyroid hormone action mediated by the c- erbA alpha-receptors.

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