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Familial isolated primary hyperparathyroidism caused by mutations of the MEN1 gene

Abstract

Background Familial isolated primary hyperparathyroidism (FIHP) is an autosomal dominant disorder that can represent an early stage of either the multiple endocrine neoplasia type 1 (MEN1) or hyperparathyroidism-jaw tumor (HPT-JT) syndromes; alternatively, the condition can be caused by an allelic variant of MEN1 or HRPT2 (hyperparathyroidism 2 gene), or caused by a distinct entity involving another locus. We have explored these possibilities in a patient with primary hyperparathyroidism, whose mother had a history of renal calculi and primary hyperparathyroidism.

Investigations Serum biochemistry and radiological investigations for primary hyperparathyroidism, MEN1 and HPT-JT, and genetic testing for MEN1 and HRPT2 mutations were undertaken.

Diagnosis FIHP with primary hyperparathyroidism as the sole endocrinopathy due to a previously unreported heterozygous missense germline MEN1 mutation, Tyr351Asn. In addition, another unreported heterozygous missense germline MEN1 mutation, Trp220Leu, was identified in an unrelated male patient with FIHP, whose mother and sister also had primary hyperparathyroidism. DNA from a parathyroid tumor from the sister revealed a loss of heterozygosity in which the mutant allele was retained. This is consistent with Knudson's 'two-hit' model of hereditary cancer and a tumor suppressor role for MEN1 in FIHP.

Management The patient underwent parathyroidectomy and has remained normocalcemic over a follow-up period of 6 years. The other four patients have remained normocalcemic for a follow-up period of 4–15 years following parathyroidectomy. None has developed abnormalities of the MEN1 syndrome, providing further support that FIHP is a distinct genetic variant of the MEN1 syndrome.

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Figure 1: DNA sequence analysis of MEN1 in two kindreds with FIHP.
Figure 2: Investigations for familial primary hyperparathyroidism.

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Acknowledgements

FM Hannan, MA Nesbit, PT Christie and RV Thakker are supported by the Medical Research Council (MRC), UK. FM Hannan is an MRC Clinical Research Training Fellow.

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Correspondence to Rajesh V Thakker.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Figure 1

Representation of the steps required for DNA sequence analysis to detect a germline mutation. (DOC 741 kb)

Supplementary Figure 2

Schematic representation of the genomic organization of the multiple endocrine neoplasia type 1 gene (DOC 723 kb)

Supplementary Table 1

Disorders associated with forms of hereditary primary hyperparathyroidism. (DOC 27 kb)

Supplementary Table 2

MEN1, HRPT2 and CASR germline mutations detected in patients with FIHP (DOC 120 kb)

Supplementary Table 3

The major clinical features of the MEN1, MEN2, HPT-JT and FBHH syndromes. (DOC 49 kb)

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Hannan, F., Nesbit, M., Christie, P. et al. Familial isolated primary hyperparathyroidism caused by mutations of the MEN1 gene. Nat Rev Endocrinol 4, 53–58 (2008). https://doi.org/10.1038/ncpendmet0718

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