Gene expression profiles in parathyroid adenoma and normal parathyroid tissue
1Department of Internal Medicine, Seoul National University College of Medicine and Seoul Metropolitan Government Boramae Medical Center, Seoul, Republic of Korea.
Abstract:
A parathyroid adenoma comprises 80-85% as a cause of primary hyperparathyroidism. The clonal origin of most parathyroid adenomas suggests a defect at the level of the gene controlling growth of the parathyroid cell or the expression of parathyroid hormone (PTH). Two genes, MEN1 and CCND1, a tumor suppressor and a proto-oncogene respectively, have been solidly established as primary tumorigenic drivers in parathyroid adenomas. As well, germline and somatic mutation of other genes involved in cell cycle regulation or PTH regulation have been discovered in parathyroid adenomas. Moreover, comparative genomic studies between parathyroid adenomas and normal parathyroid tissues have suggested more complex genetic landscape. Microarray analysis have revealed differential expression profiles of genes involved in cell cycle regulation, growth factors, apoptotic pathway, or PTH synthesis or regulation pathway such as CASR, GCM2 and KL (Klotho). Furthermore, recent next-generation sequencing analysis reconfirmed previous finding or revealed novel finding, suggesting signal peptidase complex subunit (SPCS2), ribosomal proteins (RPL23, RPL26, RPN1, RPS25), the endoplasmic reticulum membrane (SEC11C, SEC11A, SEC61G), Klotho, cyclin D1, β-catenin, VDR, CaSR and GCM2 may be important factors contributing to the parathyroid adenoma.
Insights
Parathyroid adenomas, a common cause of hyperparathyroidism, involve genetic defects. Key genes like MEN1 and CCND1, alongside others regulating cell cycle and PTH, drive tumor growth, revealing a complex genetic landscape.
Area of Science:
- Endocrinology
- Molecular Biology
- Genetics
Background:
- Parathyroid adenomas cause 80-85% of primary hyperparathyroidism.
- Tumorigenesis suggests genetic defects in parathyroid cell growth or PTH expression.
Purpose of the Study:
- To explore the genetic landscape of parathyroid adenomas.
- Identify key genes and pathways involved in parathyroid tumor development.
Main Methods:
- Comparative genomic studies.
- Microarray analysis.
- Next-generation sequencing.
Main Results:
- MEN1 and CCND1 are established drivers.
- Mutations in cell cycle and PTH regulation genes are found.
- Differential gene expression in cell cycle, growth factors, apoptosis, and PTH pathways observed.
- Novel gene findings include SPCS2, ribosomal proteins, and endoplasmic reticulum membrane proteins.
Conclusions:
- Parathyroid adenomas exhibit a complex genetic basis.
- Genes such as MEN1, CCND1, CASR, GCM2, KL, SPCS2, and others play crucial roles.
- Further research into these genetic factors is warranted.
