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Research Article Free access | 10.1172/JCI114438

A base mutation of the C-erbA beta thyroid hormone receptor in a kindred with generalized thyroid hormone resistance. Molecular heterogeneity in two other kindreds.

S J Usala, G E Tennyson, A E Bale, R W Lash, N Gesundheit, F E Wondisford, D Accili, P Hauser, and B D Weintraub

Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Molecular Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

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Published January 1, 1990 - More info

Published in Volume 85, Issue 1 on January 1, 1990
J Clin Invest. 1990;85(1):93–100. https://doi.org/10.1172/JCI114438.
© 1990 The American Society for Clinical Investigation
Published January 1, 1990 - Version history
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Abstract

Generalized thyroid hormone resistance (GTHR) is a disorder of thyroid hormone action that we have previously shown to be tightly linked to one of the two thyroid hormone receptor genes, c-erbA beta, in a single kindred, A. We now show that in two other kindreds, B and D, with differing phenotypes, there is also linkage between c-erbA beta and GTHR. The combined maximum logarithm of the odds score for all three kindreds at a recombination fraction of 0 was 5.77. In vivo studies had shown a triiodothyronine (T3)-binding affinity abnormality in nuclear receptors of kindred A, and we therefore investigated the defect in c-erbA beta in this kindred by sequencing a major portion of the T3-binding domain in the 3'-region of fibroblast c-erbA beta cDNA and leukocyte c-erbA beta genomic DNA. A base substitution, cytosine to adenine, was found at cDNA position 1643 which altered the proline codon at position 448 to a histidine. By allelic-specific hybridization, this base substitution was found in only one allele of seven affected members, and not found in 10 unaffected members of kindred A, as expected for a dominant disease. Also, this altered base was not found in kindreds B or D, or in 92 random c-erbA beta alleles. These results and the fact that the mutation is predicted to alter the secondary structure of the crucial T3-binding domain of the c-erbA beta receptor suggest this mutation is an excellent candidate for the genetic cause of GTHR in kindred A. Different mutations in the c-erbA beta gene are likely responsible for the variant phenotypes of thyroid hormone resistance in kindreds B and D.

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