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Mechanisms of Disease: multiple endocrine neoplasia type 1—relation to chromatin modifications and transcription regulation

Abstract

Multiple endocrine neoplasia type 1 (MEN1) is a hereditary tumor syndrome characterized by tumors of the parathyroid glands, the pancreatic islets, the pituitary gland, the adrenal glands, as well as by neuroendocrine carcinoid tumors, often at a young age. Causal to the syndrome are germline mutations of the MEN1 tumor-suppressor gene. Identification of gene-mutation carriers has enabled presymptomatic diagnosis and treatment of MEN1-related lesions. The product of the MEN1 gene is the nuclear protein menin. Recent observations indicate several functions for menin in the regulation of transcription, serving either as a repressor or as an activator: menin interacts with the activator-protein-1-family transcription factor JunD, changing it from an oncoprotein into a tumor-suppressor protein, putatively by recruitment of histone deacetylase complexes; menin maintains transforming growth factor β mediated signal transduction involved in parathyroid hormone and prolactin gene expression; and menin is an integral component of histone methyltransferase complexes. In this capacity menin is a regulator of expression of the cyclin-dependent-kinase inhibitors p18INK4C and p27Kip1; furthermore, menin serves as a co-activator of estrogen receptor mediated transcription, by recruiting methyltransferase activity to lysine 4 of histone 3 at the estrogen responsive TFF1(pS2) gene promoter. We propose that menin links transcription-factor function to histone-modification pathways and that this is crucial for MEN1 tumorigenesis. Understanding the molecular pathology of MEN1 tumorigenesis will lead to new therapeutic strategies.

Key Points

  • Multiple endocrine neoplasia type 1 is caused by germline mutations of the gene that encodes a protein termed menin

  • Menin is a nuclear protein involved in the regulation of gene expression at the level of transcription

  • Menin is a link between chromatin-modifying protein complexes and transcription regulation

  • Understanding the mechanism of action for menin will eventually provide targets for future therapeutic strategies

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Figure 1: Models for the various functions of menin in transcription regulation

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Acknowledgements

The authors receive grant support from The Netherlands Organisation for Health Research and Development (ZonMw, AGIKO-920-03-231) and The Netherlands Organisation for Scientific Research (NWO, PIONIER-900-98-142).

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Correspondence to Cornelis JM Lips.

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Dreijerink, K., Höppener, J., Timmers, H. et al. Mechanisms of Disease: multiple endocrine neoplasia type 1—relation to chromatin modifications and transcription regulation. Nat Rev Endocrinol 2, 562–570 (2006). https://doi.org/10.1038/ncpendmet0292

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  • DOI: https://doi.org/10.1038/ncpendmet0292

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