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CMF1–Rb interaction promotes myogenesis in avian skeletal myoblasts
Author(s) -
Robertson J. Brian,
Zhu Tianli,
Nasreen Shampa,
Kilkenny Dawn,
Bader David,
Dees Ellen
Publication year - 2008
Publication title -
developmental dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.634
H-Index - 141
eISSN - 1097-0177
pISSN - 1058-8388
DOI - 10.1002/dvdy.21544
Subject(s) - myogenin , myogenesis , myod , myf5 , biology , myogenic regulatory factors , myocyte , microbiology and biotechnology , myod protein , messenger rna , pax3 , skeletal muscle , gene , genetics , transcription factor , endocrinology
CMF1 protein is expressed in developing striated muscle before the expression of contractile proteins, and depletion of CMF1 in myoblasts results in inability to express muscle‐specific proteins. Previous studies of CMF1 identify a functional Rb‐binding domain, which is conserved in the murine and human homologues. Here, we show that CMF1 binds Rb family members, while a CMF1 protein with deletion of the Rb‐binding domain (Rb‐del CMF1) does not. Myogenic cell lines over‐expressing Rb‐del CMF1 proliferate normally, but exhibit markedly impaired differentiation, including dramatically reduced contractile proteins gene expression and failure to fuse into myotubes. Furthermore, by quantitative real‐time polymerase chain reaction, MyoD and Myf5 mRNA levels are comparable to wild‐type, while myogenin and contractile protein mRNA levels are significantly attenuated. These data demonstrate that CMF1 regulates myocyte differentiation by interaction with Rb family members to induce expression of myogenic regulatory factors. Developmental Dynamics 237:1424‐1433, 2008. © 2008 Wiley‐Liss, Inc.