Journal of Clinical Endocrinology & Metabolism, Vol 80, 1347-1351, Copyright © 1995 by Endocrine Society

ARTICLES

Genetic alterations in thyroid hyperfunctioning adenomas

D Russo, F Arturi, R Wicker, GD Chazenbalk, M Schlumberger, JA DuVillard, B Caillou, R Monier, B Rapoport and S Filetti
Dipartimento di Medicina Sperimentale e Clinica, Facolta di Farmacia, Universita di Reggio Calabria, Catanzaro, Italy.

Thirty-seven thyroid autonomously hyperfunctioning adenomas were screened for mutations in the TSH receptor (TSHR), G alpha s (gsp), and ras genes. Polymerase chain reaction-amplified fragments of the TSHR C- terminal part (exon 10), the G alpha s (exons 8 and 9), and the three ras genes were obtained from the genomic DNA extracted from 37 tumors and their adjacent normal tissues and were studied by direct nucleotide sequencing and hybridization with synthetic probes. A point mutation in the third intracellular loop (codon 623) of the TSHR was found in 3 of 37 adenomas studied. This mutation codes for a change (Ala to Ser) in the TSHR structure and is somatic and heterozygotic. Constitutive activation of the TSHR was demonstrated by an increase in basal cAMP levels after transfection of Chinese hamster ovary cells with a mutated Ser623-TSHR complementary DNA. Nine gsp[00ae]MDRV[00af]- and one ras- activating mutations were also detected. No simultaneous alteration of the studied genes was present. Thus, in hyperfunctioning thyroid adenomas, our data suggest that a mutational activation of the TSHR and gsp genes may play a tumorigenic role through constitutive activation of the cAMP pathway.

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