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Novel PRUNE2 Germline Mutations in Aggressive and Benign Parathyroid Neoplasms
Sara Storvall1, Eeva Ryhänen1, Auli Karhu2,3
1Department of Endocrinology, Abdominal Center, University of Helsinki, Helsinki University Hospital, Haartmaninkatu 4, 00290 Helsinki, Finland.
Abstract:
Parathyroid tumors are mostly sporadic but can also occur in familial forms, including different kinds of genetic syndromes with varying phenotypes and penetrance. Recently, somatic mutations of the tumor suppressor gene PRUNE2 were found to be frequent in parathyroid cancer (PC). The germline mutation status of PRUNE2 was investigated in a large cohort of patients with parathyroid tumors from the genetically homogenous Finnish population, 15 of which had PC, 16 atypical parathyroid tumors (APT), and 6 benign parathyroid adenomas (PA). Mutations in previously established hyperparathyroidism-related genes were screened with a targeted gene panel analysis. Nine PRUNE2 germline mutations with a minor allele frequency (MAF) of <0.05 were found in our cohort. Five of these were predicted to be potentially damaging and were identified in two patients with PC, two with APT, and three with PA. The mutational status was not associated with the tumor group nor related to the clinical picture or severity of the disease. Still, the frequent finding of rare germline mutations of PRUNE2 may point to the gene playing a role in the pathogenesis of parathyroid neoplasms.
Insights
Researchers investigated the tumor suppressor gene PRUNE2 in Finnish patients with parathyroid tumors. Rare germline mutations were found across tumor types, suggesting PRUNE2 may play a role in parathyroid neoplasm development.
Area of Science:
- Endocrinology
- Oncology
- Human Genetics
Background:
- Parathyroid tumors are typically sporadic but can be linked to genetic syndromes.
- Somatic mutations in the PRUNE2 tumor suppressor gene are common in parathyroid cancer (PC).
Purpose of the Study:
- To investigate the germline mutation status of PRUNE2 in a large cohort of Finnish patients with parathyroid tumors.
- To determine if PRUNE2 germline mutations are associated with different parathyroid tumor types or clinical outcomes.
Main Methods:
- A targeted gene panel analysis was used to screen for mutations in PRUNE2 and other hyperparathyroidism-related genes.
- A cohort of 92 patients with parathyroid tumors (15 PC, 16 atypical parathyroid tumors [APT], 6 benign parathyroid adenomas [PA]) from Finland was studied.
Main Results:
- Nine rare PRUNE2 germline mutations (minor allele frequency <0.05) were identified.
- Five potentially damaging mutations were found in patients with PC, APT, and PA.
- No significant association was observed between PRUNE2 mutational status and tumor group, clinical presentation, or disease severity.
Conclusions:
- The frequent identification of rare PRUNE2 germline mutations suggests a potential role for this gene in the pathogenesis of parathyroid neoplasms.
- Further research is warranted to elucidate the specific mechanisms by which PRUNE2 mutations contribute to parathyroid tumor development.
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