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Myocyte enhancer binding factor 2B (MEF2B) is a transcription factor part of the MEF2 gene family including MEF2A, MEF2C, and MEF2D.[1][2] However, MEF2B is distant from the other three branches of MEF2 genes as it lacks the protein-coding Holliday junction recognition protein C-terminal (HJURP_C) region in vertebrates.[3]
The MEF2 gene family is expressed in muscle-specific gene activation and maintenance during development.[3][4] MEF2B mRNA is present in skeletal, smooth, brain and heart muscles.[5] MEF2B is directly involved in smooth muscle myosin heavy chain (SMHC) gene regulation. Overexpression of MEF2B will activate the SMHC promoter in smooth muscle when it is bound to the A/T-rich element of the promoter.[5]
Recurrent mutations in this gene have been associated with cases of diffuse large B-cell lymphoma.[8] In its mutated form, MEF2B can lead to deregulation of the proto-oncogene BCL6 expression in diffuse large B-cell lymphomas (DLBCL).[9] Mutations of MEF2B enhance its transcriptional activity due to either a disruption with its corepressor CABIN1 or causing the gene to become insensitive to inhibitory signaling events.[9]
↑Krenács, Dóra; Borbényi, Zita; Bedekovics, Judit; Méhes, Gábor; Bagdi, Enikő; Krenács, László (2015-09-01). "Pattern of MEF2B expression in lymphoid tissues and in malignant lymphomas". Virchows Archiv: An International Journal of Pathology. 467 (3): 345–355. doi:10.1007/s00428-015-1796-6. ISSN1432-2307. PMID26089142.
↑Buchberger, A.; Arnold, H. H. (1999-06-01). "The MADS domain containing transcription factor cMef2a is expressed in heart and skeletal muscle during embryonic chick development". Development Genes and Evolution. 209 (6): 376–381. doi:10.1007/s004270050267. ISSN0949-944X. PMID10370120.
↑ 5.05.1Katoh, Y.; Molkentin, J. D.; Dave, V.; Olson, E. N.; Periasamy, M. (1998-01-16). "MEF2B is a component of a smooth muscle-specific complex that binds an A/T-rich element important for smooth muscle myosin heavy chain gene expression". The Journal of Biological Chemistry. 273 (3): 1511–1518. doi:10.1074/jbc.273.3.1511. ISSN0021-9258. PMID9430690.
↑Han A, Pan F, Stroud JC, Youn HD, Liu JO, Chen L (Apr 2003). "Sequence-specific recruitment of transcriptional co-repressor Cabin1 by myocyte enhancer factor-2". Nature. 422 (6933): 730–4. doi:10.1038/nature01555. PMID12700764.
↑Youn HD, Sun L, Prywes R, Liu JO (Oct 1999). "Apoptosis of T cells mediated by Ca2+-induced release of the transcription factor MEF2". Science. 286 (5440): 790–3. doi:10.1126/science.286.5440.790. PMID10531067.
Hobson GM, Krahe R, Garcia E, Siciliano MJ, Funanage VL (Oct 1995). "Regional chromosomal assignments for four members of the MADS domain transcription enhancer factor 2 (MEF2) gene family to human chromosomes 15q26, 19p12, 5q14, and 1q12-q23". Genomics. 29 (3): 704–11. doi:10.1006/geno.1995.9007. PMID8575763.
Katoh Y, Molkentin JD, Dave V, Olson EN, Periasamy M (Jan 1998). "MEF2B is a component of a smooth muscle-specific complex that binds an A/T-rich element important for smooth muscle myosin heavy chain gene expression". The Journal of Biological Chemistry. 273 (3): 1511–8. doi:10.1074/jbc.273.3.1511. PMID9430690.
Iida K, Hidaka K, Takeuchi M, Nakayama M, Yutani C, Mukai T, Morisaki T (Jan 1999). "Expression of MEF2 genes during human cardiac development". The Tohoku Journal of Experimental Medicine. 187 (1): 15–23. doi:10.1620/tjem.187.15. PMID10458488.
Youn HD, Sun L, Prywes R, Liu JO (Oct 1999). "Apoptosis of T cells mediated by Ca2+-induced release of the transcription factor MEF2". Science. 286 (5440): 790–3. doi:10.1126/science.286.5440.790. PMID10531067.
Li M, Linseman DA, Allen MP, Meintzer MK, Wang X, Laessig T, Wierman ME, Heidenreich KA (Sep 2001). "Myocyte enhancer factor 2A and 2D undergo phosphorylation and caspase-mediated degradation during apoptosis of rat cerebellar granule neurons". The Journal of Neuroscience. 21 (17): 6544–52. PMID11517243.
Han A, Pan F, Stroud JC, Youn HD, Liu JO, Chen L (Apr 2003). "Sequence-specific recruitment of transcriptional co-repressor Cabin1 by myocyte enhancer factor-2". Nature. 422 (6933): 730–4. doi:10.1038/nature01555. PMID12700764.
Konig S, Hinard V, Arnaudeau S, Holzer N, Potter G, Bader CR, Bernheim L (Jul 2004). "Membrane hyperpolarization triggers myogenin and myocyte enhancer factor-2 expression during human myoblast differentiation". The Journal of Biological Chemistry. 279 (27): 28187–96. doi:10.1074/jbc.M313932200. PMID15084602.
Han A, He J, Wu Y, Liu JO, Chen L (Jan 2005). "Mechanism of recruitment of class II histone deacetylases by myocyte enhancer factor-2". Journal of Molecular Biology. 345 (1): 91–102. doi:10.1016/j.jmb.2004.10.033. PMID15567413.