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Title: A highly conserved molecular switch binds MSY-3 to regulate myogenin repression in postnatal muscle
Author: Berghella, Libera
Angelis, Francesco De
Buysscher, Tristan de
Mortazavi, Ali
Biressi, Stefano
Forcales Fernàndez, Sonia-Vanina
Sirabella, Dario
Cossu, Claudia
Wold, Barbara J.
Keywords: Innervació
Issue Date: 1-Aug-2008
Publisher: Cold Spring Harbor Laboratory Press
Abstract: Myogenin is the dominant transcriptional regulator of embryonic and fetal muscle differentiation and during maturation is profoundly down-regulated. We show that a highly conserved 17-bp DNA cis-acting sequence element located upstream of the myogenin promoter (myogHCE) is essential for postnatal repression of myogenin in transgenic animals. We present multiple lines of evidence supporting the idea that repression is mediated by the Y-box protein MSY-3. Electroporation in vivo shows that myogHCE and MSY-3 are required for postnatal repression. We further show that, in the C2C12 cell culture system, ectopic MSY-3 can repress differentiation, while reduced MSY-3 promotes premature differentiation. MSY-3 binds myogHCE simultaneously with the homeodomain protein Pbx in postnatal innervated muscle. We therefore propose a model in which the myogHCE motif operates as a switch by specifying opposing functions; one that was shown previously is regulated by MyoD and Pbx and it specifies a chromatin opening, gene-activating function at the time myoblasts begin to differentiate; the other includes MYS-3 and Pbx, and it specifies a repression function that operates during and after postnatal muscle maturation in vivo and in myoblasts before they begin to differentiate.
Note: Reproducció del document publicat a:
It is part of: Genes & Development, 2008, vol. 22, num. 15, p. 2125-2138
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ISSN: 0890-9369
Appears in Collections:Articles publicats en revistes (Patologia i Terapèutica Experimental)

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