A novel CDC73 gene mutation in an Italian family with hyperparathyroidism- jaw tumour (HPT-JT) syndrome

M. G. Chiofalo, A. Sparaneo, M. Chetta, R. Franco, F. Baorda, L. Cinque, M. Granatiero, L. D'Agruma, L. Pezzullo, A. Scillitani, V. Guarnieri

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Purpose: The CDC73 gene, encoding parafibromin, has been identified as a tumour suppressor gene both in hyperparathyroidism-jaw tumour (HPT-JT) syndrome and in sporadic parathyroid carcinoma. While the vast majority of CDC73 mutations affect the N-terminus or the central core of the encoded protein, as yet few mutations have been reported affecting the C-terminus. Here, we report a case (Caucasian female, 28 years) with an invasive ossifying fibroma of the left mandible and hyperparathyroidism (sCa∈=∈16 mg/dl, PTH∈=∈660 pg/mL) due to a parathyroid lesion of 20 mm, hystologically diagnosed as carcinoma. Methods: The whole CDC73 gene was screened for the presence of mutations by Sanger sequencing. Immunohistochemistry, in vitro functional assays, Western blotting, MTT assays and in-silico modelling were performed to assess the effect of the detected mutation. Results: Sequence analysis of the CDC73 gene in the proband revealed the presence of a novel deletion affecting the C-terminus of the encoded protein (c.1379delT/p. L460Lfs*18). Clinical and genetic analyses of the available relatives led to the identification of three additional carriers, one of whom was also affected by a parathyroid lesion. Immunohistochemistry, Western blotting, MTT and in-silico modelling assays revealed that the deletion leads to down-regulation of the mutated protein, most likely through a proteasome-mediated pathway. We also found that the deletion may cause a conformational change in the C-terminus of the protein, possibly affecting its interaction with partner proteins. Finally, we found that the mutant protein enhances cellular growth. Conclusions: We report a novel mutation in the CDC73 gene that may underlie HPT-JT syndrome. This mutation appears to affect the C-terminal moiety of the encoded protein, which is thought to interact with other protein partners. The identification of these partners may be instrumental for our understanding of the CDC73-associated phenotype.

Original languageEnglish
Pages (from-to)281-288
Number of pages8
JournalCellular Oncology
Volume37
Issue number4
DOIs
Publication statusPublished - 2014

Fingerprint

Mutation
Genes
Proteins
Computer Simulation
Western Blotting
Immunohistochemistry
Ossifying Fibroma
Parathyroid Neoplasms
Hyperparathyroidism
Proteasome Endopeptidase Complex
Mutant Proteins
Protein C
Tumor Suppressor Genes
Mandible
Sequence Analysis
Hyperparathyroidism 2
Down-Regulation
Carcinoma
Phenotype
Growth

Keywords

  • CDC73
  • HPT-JT
  • Hyperparathyroidism with jaw tumours
  • Parafibromin

ASJC Scopus subject areas

  • Cancer Research
  • Molecular Medicine
  • Oncology
  • Medicine(all)

Cite this

A novel CDC73 gene mutation in an Italian family with hyperparathyroidism- jaw tumour (HPT-JT) syndrome. / Chiofalo, M. G.; Sparaneo, A.; Chetta, M.; Franco, R.; Baorda, F.; Cinque, L.; Granatiero, M.; D'Agruma, L.; Pezzullo, L.; Scillitani, A.; Guarnieri, V.

In: Cellular Oncology, Vol. 37, No. 4, 2014, p. 281-288.

Research output: Contribution to journalArticle

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abstract = "Purpose: The CDC73 gene, encoding parafibromin, has been identified as a tumour suppressor gene both in hyperparathyroidism-jaw tumour (HPT-JT) syndrome and in sporadic parathyroid carcinoma. While the vast majority of CDC73 mutations affect the N-terminus or the central core of the encoded protein, as yet few mutations have been reported affecting the C-terminus. Here, we report a case (Caucasian female, 28 years) with an invasive ossifying fibroma of the left mandible and hyperparathyroidism (sCa∈=∈16 mg/dl, PTH∈=∈660 pg/mL) due to a parathyroid lesion of 20 mm, hystologically diagnosed as carcinoma. Methods: The whole CDC73 gene was screened for the presence of mutations by Sanger sequencing. Immunohistochemistry, in vitro functional assays, Western blotting, MTT assays and in-silico modelling were performed to assess the effect of the detected mutation. Results: Sequence analysis of the CDC73 gene in the proband revealed the presence of a novel deletion affecting the C-terminus of the encoded protein (c.1379delT/p. L460Lfs*18). Clinical and genetic analyses of the available relatives led to the identification of three additional carriers, one of whom was also affected by a parathyroid lesion. Immunohistochemistry, Western blotting, MTT and in-silico modelling assays revealed that the deletion leads to down-regulation of the mutated protein, most likely through a proteasome-mediated pathway. We also found that the deletion may cause a conformational change in the C-terminus of the protein, possibly affecting its interaction with partner proteins. Finally, we found that the mutant protein enhances cellular growth. Conclusions: We report a novel mutation in the CDC73 gene that may underlie HPT-JT syndrome. This mutation appears to affect the C-terminal moiety of the encoded protein, which is thought to interact with other protein partners. The identification of these partners may be instrumental for our understanding of the CDC73-associated phenotype.",
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AU - Chiofalo, M. G.

AU - Sparaneo, A.

AU - Chetta, M.

AU - Franco, R.

AU - Baorda, F.

AU - Cinque, L.

AU - Granatiero, M.

AU - D'Agruma, L.

AU - Pezzullo, L.

AU - Scillitani, A.

AU - Guarnieri, V.

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N2 - Purpose: The CDC73 gene, encoding parafibromin, has been identified as a tumour suppressor gene both in hyperparathyroidism-jaw tumour (HPT-JT) syndrome and in sporadic parathyroid carcinoma. While the vast majority of CDC73 mutations affect the N-terminus or the central core of the encoded protein, as yet few mutations have been reported affecting the C-terminus. Here, we report a case (Caucasian female, 28 years) with an invasive ossifying fibroma of the left mandible and hyperparathyroidism (sCa∈=∈16 mg/dl, PTH∈=∈660 pg/mL) due to a parathyroid lesion of 20 mm, hystologically diagnosed as carcinoma. Methods: The whole CDC73 gene was screened for the presence of mutations by Sanger sequencing. Immunohistochemistry, in vitro functional assays, Western blotting, MTT assays and in-silico modelling were performed to assess the effect of the detected mutation. Results: Sequence analysis of the CDC73 gene in the proband revealed the presence of a novel deletion affecting the C-terminus of the encoded protein (c.1379delT/p. L460Lfs*18). Clinical and genetic analyses of the available relatives led to the identification of three additional carriers, one of whom was also affected by a parathyroid lesion. Immunohistochemistry, Western blotting, MTT and in-silico modelling assays revealed that the deletion leads to down-regulation of the mutated protein, most likely through a proteasome-mediated pathway. We also found that the deletion may cause a conformational change in the C-terminus of the protein, possibly affecting its interaction with partner proteins. Finally, we found that the mutant protein enhances cellular growth. Conclusions: We report a novel mutation in the CDC73 gene that may underlie HPT-JT syndrome. This mutation appears to affect the C-terminal moiety of the encoded protein, which is thought to interact with other protein partners. The identification of these partners may be instrumental for our understanding of the CDC73-associated phenotype.

AB - Purpose: The CDC73 gene, encoding parafibromin, has been identified as a tumour suppressor gene both in hyperparathyroidism-jaw tumour (HPT-JT) syndrome and in sporadic parathyroid carcinoma. While the vast majority of CDC73 mutations affect the N-terminus or the central core of the encoded protein, as yet few mutations have been reported affecting the C-terminus. Here, we report a case (Caucasian female, 28 years) with an invasive ossifying fibroma of the left mandible and hyperparathyroidism (sCa∈=∈16 mg/dl, PTH∈=∈660 pg/mL) due to a parathyroid lesion of 20 mm, hystologically diagnosed as carcinoma. Methods: The whole CDC73 gene was screened for the presence of mutations by Sanger sequencing. Immunohistochemistry, in vitro functional assays, Western blotting, MTT assays and in-silico modelling were performed to assess the effect of the detected mutation. Results: Sequence analysis of the CDC73 gene in the proband revealed the presence of a novel deletion affecting the C-terminus of the encoded protein (c.1379delT/p. L460Lfs*18). Clinical and genetic analyses of the available relatives led to the identification of three additional carriers, one of whom was also affected by a parathyroid lesion. Immunohistochemistry, Western blotting, MTT and in-silico modelling assays revealed that the deletion leads to down-regulation of the mutated protein, most likely through a proteasome-mediated pathway. We also found that the deletion may cause a conformational change in the C-terminus of the protein, possibly affecting its interaction with partner proteins. Finally, we found that the mutant protein enhances cellular growth. Conclusions: We report a novel mutation in the CDC73 gene that may underlie HPT-JT syndrome. This mutation appears to affect the C-terminal moiety of the encoded protein, which is thought to interact with other protein partners. The identification of these partners may be instrumental for our understanding of the CDC73-associated phenotype.

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