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Journal of Clinical Endocrinology & Metabolism, Vol 73, 1374-1376, Copyright © 1991 by Endocrine Society

ARTICLES

A somatic point mutation in a putative ligand binding domain of the TSH receptor in a patient with autoimmune hyperthyroidism

NE Heldin, B Gustavsson, K Westermark and B Westermark
Department of Pathology, University Hospital, Uppsala, Sweden.

Nucleotide sequence analysis of PCR fragments of TSH receptor cDNA synthesized from thyroid RNA of a patient with autoimmune hyperthyroidism, revealed two different sequences in the first position of codon 36. In one of the sequences, there was a C for G substitution leading to the D36----H substitution in the predicted peptide. Both variants were also found in genomic DNA of thyroid tissue. However, only the germ line sequence was found in other tissues representing all three different germ layers. The novel sequence is therefore likely to represent a somatic mutation in the thyroid tissue, of possible relevance for the pathogenesis of the patient's thyroid disorder.


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