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Original Article
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Volume 349:1722-1729 October 30, 2003 Number 18
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Somatic and Germ-Line Mutations of the HRPT2 Gene in Sporadic Parathyroid Carcinoma
Trisha M. Shattuck, B.S., Stiina Välimäki, M.D., Takao Obara, M.D., Randall D. Gaz, M.D., Orlo H. Clark, M.D., Dolores Shoback, M.D., Margaret E. Wierman, M.D., Katsuyoshi Tojo, M.D., Christiane M. Robbins, M.S., John D. Carpten, Ph.D., Lars-Ove Farnebo, M.D., Ph.D., Catharina Larsson, M.D., Ph.D., and Andrew Arnold, M.D.

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 by Weinstein, L. S.

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ABSTRACT

Background We looked for mutations of the HRPT2 gene, which encodes the parafibromin protein, in sporadic parathyroid carcinoma because germ-line inactivating HRPT2 mutations have been found in a type of familial hyperparathyroidism — hyperparathyroidism–jaw tumor (HPT-JT) syndrome — that carries an increased risk of parathyroid cancer.

Methods We directly sequenced the full coding and flanking splice-junctional regions of the HRPT2 gene in 21 parathyroid carcinomas from 15 patients who had no known family history of primary hyperparathyroidism or the HPT-JT syndrome at presentation. We also sought to confirm the somatic nature of the identified mutations and tested the carcinomas for tumor-specific loss of heterozygosity at HRPT2.

Results Parathyroid carcinomas from 10 of the 15 patients had HRPT2 mutations, all of which were predicted to inactivate the encoded parafibromin protein. Two distinct HRPT2 mutations were found in tumors from five patients, and biallelic inactivation as a result of a mutation and loss of heterozygosity was found in one tumor. At least one HRPT2 mutation was demonstrably somatic in carcinomas from six patients. Unexpectedly, HRPT2 mutations in the parathyroid carcinomas of three patients were identified as germ-line mutations.

Conclusions Sporadic parathyroid carcinomas frequently have HRPT2 mutations that are likely to be of pathogenetic importance. Certain patients with apparently sporadic parathyroid carcinoma carry germ-line mutations in HRPT2 and may have the HPT-JT syndrome or a phenotypic variant.


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From the Center for Molecular Medicine (T.M.S., A.A.) and the Division of Endocrinology and Metabolism (A.A.), University of Connecticut School of Medicine, Farmington; the Departments of Molecular Medicine (S.V., C.L.) and Surgical Sciences (S.V., L.-O.F.), Karolinska Hospital, Stockholm, Sweden; the Department of Endocrine Surgery, Tokyo Women's Medical University, Sinjuku-ku, Tokyo, Japan (T.O.); the Department of Surgery, Massachusetts General Hospital, Boston (R.D.G.); the Department of Surgery, University of California, San Francisco, Mt. Zion Medical Center, San Francisco (O.H.C.); the Endocrine Research Unit, Veterans Affairs Medical Center, University of California, San Francisco, San Francisco (D.S.); the Division of Endocrinology, University of Colorado, Veterans Affairs Medical Center, Denver (M.E.W.); the Division of Diabetes and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan (K.T.); and the Cancer Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Md. (C.M.R., J.D.C.).

Ms. Shattuck and Dr. Välimäki contributed equally to this article.

Address reprint requests to Dr. Arnold at the Center for Molecular Medicine, University of Connecticut School of Medicine, 263 Farmington Ave., Farmington, CT 06030-3101, or at molecularmedicine{at}uchc.edu, or to Dr. Larsson at catharina.larsson{at}cmm.ki.se.

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