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Related Experiment Videos

The depolarization response element in acetylcholine receptor genes is a dual-function E box

C T Su1, C F Huang, J Schmidt

  • 1Department of Biochemistry and Cell Biology, State University of New York at Stony Brook 11794, USA.

FEBS Letters
|June 12, 1995
PubMed
Summary

Plasma membrane depolarization alters the function of E boxes in acetylcholine receptor genes. These elements switch from activating to repressive modes, impacting gene expression in muscle cells.

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Muscle Physiology

Background:

  • Acetylcholine receptor (AChR) subunit genes possess E boxes, crucial regulatory elements.
  • Membrane depolarization is known to affect AChR gene expression.

Purpose of the Study:

  • To investigate the role of E boxes in AChR subunit gene regulation by membrane depolarization.
  • To elucidate the mechanism by which electrical stimulation and KCl affect these genes.

Main Methods:

  • Utilized transfected C2C12 myogenic cells.
  • Examined wildtype and mutant regulatory regions of chick AChR alpha, gamma, delta subunits, and mouse MLC genes.
  • Applied electrical stimulation and KCl treatment.

Main Results:

Related Experiment Videos

  • Point mutations confirmed E boxes act as activating elements targeted by depolarization signals.
  • Plasma membrane depolarization was shown to switch E boxes from an activating to a repressive mode.
  • Insertion of a depolarization response element into an unrelated promoter validated this switching mechanism.

Conclusions:

  • E boxes are key mediators of the response to membrane depolarization in AChR subunit gene regulation.
  • Membrane depolarization dynamically regulates gene expression by altering the mode of E box function.
  • This mechanism provides insight into the control of muscle-specific gene expression.