Mitogenic repression of myogenin autoregulation

Diane G. Edmondson, Thomas J. Brennan, Eric N. Olson

Research output: Contribution to journalArticle

46 Scopus citations


The muscle-specific helix-loop-helix proteins MyoD and myogenin have been shown to positively autoregulate their own expression and to cross-activate one another's expression following transfection into a variety of nonmyogenic cell lines. We show that the ability of an exogenous myogenin expression vector to activate the endogenous myogenin allele in 10T1/2 fibroblasts is dependent on serum withdrawal. Repression of myogenin autoregulation by serum can be observed with a reporter gene linked to myogenin upstream sequences, indicating that repression occurs at the level of transcription. Like MyoD, myogenin exhibits a short half-life (~20 min), which may serve to maintain the autoregulatory loop without allowing excess accumulation of the protein.

Original languageEnglish (US)
Pages (from-to)21343-21346
Number of pages4
JournalJournal of Biological Chemistry
Issue number32
StatePublished - Jan 1 1991


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Edmondson, D. G., Brennan, T. J., & Olson, E. N. (1991). Mitogenic repression of myogenin autoregulation. Journal of Biological Chemistry, 266(32), 21343-21346.