The RNA helicases p68/p72 and the noncoding RNA SRA are coregulators of MyoD and skeletal muscle differentiation

Giuseppina Caretti, Louis R. Schiltz, F. Jeffrey Dilworth, Monica Di Padova, Po Zhao, Vasily Ogryzko, Frances V. Fuller-Pace, Eric P. Hoffman, Stephen J. Tapscott, Vittorio Sartorelli

    Research output: Contribution to journalArticlepeer-review

    214 Citations (Scopus)


    MyoD regulates skeletal myogenesis. Since proteins associated with MyoD exert regulatory functions, their identification is expected to contribute important insights into the mechanisms governing gene expression in skeletal muscle. We have found that the RNA helicases p68/p72 are MyoD-associated proteins and that the noncoding RNA SRA also immunoprecipitates with MyoD. In vitro and in vivo experiments indicated that both p68/p72 and SRA are coactivators of MyoD. RNA interference toward either p68/p72 or SRA prevented proper activation of muscle gene expression and cell differentiation. Unexpectedly, reducing the levels of p68/p72 proteins impaired recruitment of the TATA binding protein TBP; RNA polymerase II; and the catalytic subunit of the ATPase SWI/SNF complex, Brg-1, and hindered chromatin remodeling. These findings reveal that p68/p72 play a critical role in promoting the assembly of proteins required for the formation of the transcription initiation complex and chromatin remodeling.
    Original languageEnglish
    Pages (from-to)547-560
    Number of pages14
    JournalDevelopmental Cell
    Issue number4
    Publication statusPublished - Oct 2006


    • Cell differentiation physiology
    • Muscle, skeletal physiology
    • MyoD protein metabolism
    • RNA helicases metabolism
    • RNA untranslated metabolism


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