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Analysis of the RET proto-oncogene in sporadic parathyroid adenomas
G H Williams1, S Rooney, A Carss
1Department of Pathology, University of Cambridge, Addenbrookes Hospital, U.K.
Abstract:
Missense germline mutations of the RET proto-oncogene have recently been identified in the hereditary cancer syndromes MEN2A, MEN2B, and FMTC, all characterized by medullary carcinoma, but also including phaeochromocytoma in MEN2A and MEN2B and parathyroid disease in MEN2A. In addition, somatic RET proto-oncogene mutations have been identified in a subset of sporadic medullary carcinomas and phaeochromocytomas. This study investigated the possibility that RET plays a role in sporadic parathyroid neoplasia. Firstly, normal and neoplastic parathyroid tissues were screened for expression of the RET proto-oncogene, using an RT-PCR approach on autopsy material. Secondly, 20 archival parathyroid adenomas were screened for somatic mutations in the transmembrane region of RET, the region associated with germline mutations in MEN2A and hence parathyroid disease, using a PCR-solid phase direct sequencing approach. RET expression was identified in all the parathyroid tissues analysed. However, no mutations were identified in any of the 20 adenomas, suggesting either that other mechanisms of RET activation occur, such as translocation, or that RET plays a more minor role in the growth control of the parathyroid cells than in C cells or phaeochromocytes.
Insights
This study found RET proto-oncogene expression in parathyroid tissues but no mutations in sporadic parathyroid adenomas. This suggests RET may play a minor role in parathyroid neoplasia compared to other cancers.
Area of Science:
- Oncology
- Genetics
- Endocrinology
Background:
- Germline mutations in the RET proto-oncogene are linked to hereditary cancers like MEN2A, MEN2B, and FMTC.
- Somatic RET mutations are found in sporadic medullary carcinomas and phaeochromocytomas.
- The role of RET in sporadic parathyroid neoplasia remains unclear.
Purpose of the Study:
- To investigate the potential role of the RET proto-oncogene in sporadic parathyroid neoplasia.
- To screen parathyroid tissues for RET expression and mutations.
Main Methods:
- Screening for RET proto-oncogene expression using RT-PCR on autopsy-derived parathyroid tissues.
- Analyzing 20 archival parathyroid adenomas for somatic mutations in the RET transmembrane region via PCR-solid phase direct sequencing.
Main Results:
- RET proto-oncogene expression was detected in all analyzed parathyroid tissues.
- No somatic mutations in the RET transmembrane region were identified in the 20 parathyroid adenomas.
Conclusions:
- While RET is expressed in parathyroid tissue, its direct mutation does not appear to be a significant mechanism in sporadic parathyroid adenomas.
- Alternative RET activation pathways, such as translocations, may be involved, or RET may have a less prominent role in parathyroid cell growth compared to C cells or phaeochromocytes.