{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T00:42:06Z","timestamp":1773276126119,"version":"3.50.1"},"reference-count":30,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2005,11,18]],"date-time":"2005-11-18T00:00:00Z","timestamp":1132272000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinical Endocrinology"],"published-print":{"date-parts":[[2005,12]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p><jats:bold>Objective\u2002<\/jats:bold> \u2002We have identified a large kindred with multiple endocrine neoplasia\u00a02A (MEN\u00a02A) due to a mutation at <jats:italic>RET<\/jats:italic> codon 609 that results in a cysteine to serine substitution, a mutation previously identified in only one case in the literature. We characterized the clinical phenotype of the kindred and the biochemical mechanism of this new mutation.<\/jats:p><jats:p><jats:bold>Patients and design\u2002<\/jats:bold> \u2002The index case, a 42\u2010year\u2010old woman, presented with pheochromocytoma. We screened 29 family members for the presence of the mutation. Of the 15 mutation\u2010positive family members, 11 agreed to undergo further evaluation by physical examination, calcium and pentagastrin\u2010stimulated calcitonin levels, measurement of urinary metanephrines, adrenal imaging and serum calcium levels. Biochemical characterization of the mutation was by transient transfection of human neuroblastoma cells and Western blot analysis.<\/jats:p><jats:p><jats:bold>Results\u2002<\/jats:bold> \u2002This kindred demonstrated an inheritance pattern consistent with autosomal dominant pheochromocytoma. Strikingly, no clinically evident case of medullary thyroid cancer (MTC) was observed among mutation\u2010positive family members. Thyroidectomy in six cases revealed C\u2010cell hyperplasia in all and microscopic MTC in two cases. Transfection experiments using human neuroblastoma cells showed that the mutant RET, unlike the wild\u2010type receptor, is constitutively phosphorylated in the absence of ligand, and thus resembles other previously characterized MEN\u00a02A mutations.<\/jats:p><jats:p><jats:bold>Conclusions\u2002<\/jats:bold> \u2002The identification of a new mutation causing a MEN\u00a02A phenotype that features pheochromocytoma and the surprising absence of clinically apparent MTC has significant implications for carriers of this mutation and provides further insights into the genotype\u2013phenotype correlation in MEN\u00a02A.<\/jats:p>","DOI":"10.1111\/j.1365-2265.2005.02400.x","type":"journal-article","created":{"date-parts":[[2005,11,18]],"date-time":"2005-11-18T09:50:17Z","timestamp":1132307417000},"page":"676-682","source":"Crossref","is-referenced-by-count":17,"title":["Multiple endocrine neoplasia 2A due to a unique C609S <i>RET<\/i> mutation presents with pheochromocytoma and reduced penetrance of medullary thyroid carcinoma"],"prefix":"10.1111","volume":"63","author":[{"given":"William B.","family":"Kinlaw","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah M.","family":"Scott","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert A.","family":"Maue","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vincent A.","family":"Memoli","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert D.","family":"Harris","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gilbert H.","family":"Daniels","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Donna 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