A Novel Mutation in a Patient with Hyperparathyroidism–Jaw Tumour Syndrome

Hyperparathyroidism–jaw tumour syndrome (HPT-JT) is a rare variant of familial hyperparathyroidism, characterized by primary hyperparathyroidism (PHPT) due to one or multiple parathyroid adenomas, and benign tumours of the mandible and maxilla. It has an autosomal dominant pattern of inheritance, an...

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Bibliographic Details
Published in:Endocrine pathology 2016-06, Vol.27 (2), p.142-146
Main Authors: Bellido, Virginia, Larrañaga, Ihintza, Guimón, Maite, Martinez-Conde, Rafael, Eguia, Asier, Perez de Nanclares, Gustavo, Castaño, Luis, Gaztambide, Sonia
Format: Article
Language:English
Subjects:
Adenoma - genetics
DNA Mutational Analysis
Endocrinology
Female
Fibroma - genetics
Humans
Hyperparathyroidism - genetics
Jaw Neoplasms - genetics
Medicine
Medicine & Public Health
Mutation
Oncology
Pathology
Polymerase Chain Reaction
Tumor Suppressor Proteins - genetics
Young Adult
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Summary:Hyperparathyroidism–jaw tumour syndrome (HPT-JT) is a rare variant of familial hyperparathyroidism, characterized by primary hyperparathyroidism (PHPT) due to one or multiple parathyroid adenomas, and benign tumours of the mandible and maxilla. It has an autosomal dominant pattern of inheritance, and is associated with mutations that deactivate the cell division cycle protein 73 homolog ( CDC73 ) gene, also known as hyperparathyroidism 2 ( HRPT2 ), located on the long arm of chromosome 1, that encodes for the tumour suppressor protein parafibromin. In the majority of cases, PHPT is the presenting symptom, but up to 30 % of HPT-JT cases initially present with an ossifying fibroma of the maxillofacial bones. HPT-JT may result in severe hypercalcemia-related complications and an elevated risk of parathyroid carcinoma. For this reason, early identification of the disease is important. We present the case of a 23-year-old woman who was found to have jaw tumours and was later diagnosed with PHPT. Genetic analysis revealed a novel mutation in exon 1 of CDC73 . This report contributes to the understanding of the genetics of this rare syndrome. It also highlights the fact that HPT-JT should be considered and CDC73 mutation analysis should be performed in cases of early-onset PHPT associated with ossifying fibromas of the jaw.
ISSN:1046-3976
1559-0097
DOI:10.1007/s12022-016-9427-6