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Proc Natl Acad Sci U S A February 5, 2008; 105 (5): 1545-50.
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The myocardin-related transcription factor, MASTR, cooperates with MyoD to activate skeletal muscle gene expression.

The myocardin family proteins (myocardin, MRTF-A, and MRTF-B) are serum response factor (SRF) cofactors and potent transcription activators. Gene-ablation studies have indicated important developmental functions for myocardin family proteins primarily in regulation of cardiac and smooth muscle development. Using Xenopus genome and cDNA databases, we identified a myocardin-related transcription factor expressed specifically in the skeletal muscle lineage. Synteny and sequence alignments indicate that this gene is the frog orthologue of mouse MASTR [Creemers EE, Sutherland LB, Oh J, Barbosa AC, Olson EN (2006) Coactivation of MEF2 by the SAP domain proteins myocardin and MASTR. Mol Cell 23:83-96]. Inhibition of MASTR function in the Xenopus embryo by using dominant-negative constructions or morpholino knockdown results in a dramatic reduction in expression of skeletal muscle marker genes. Overexpression of MASTR in whole embryos or embryonic tissue explants induces ectopic expression of muscle marker genes. Furthermore, MASTR cooperates with the myogenic regulatory factors MyoD and Myf5 to activate transcription of skeletal muscle genes. An essential function for MASTR in regulation of myogenic development in the vertebrate embryo has not been previously indicated.

PubMed ID: 18230740
PMC ID: PMC2234181
Article link: Proc Natl Acad Sci U S A
Grant support: [+]

Species referenced: Xenopus
Genes referenced: actc1 actl6a apcs mef2a mrtfa mrtfb myf5 myh4 myh6 myl1 myocd myod1 myos odc1 srf tnni1.2 tnni2 tpm1
Morpholinos: myos MO2 myos MO3

Article Images: [+] show captions
References [+] :
Berkes, MyoD and the transcriptional control of myogenesis. 2005, Pubmed