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Hedgehog signalling: Ci complex cuts and clasps

D Kalderon1

  • 1Department of Biological Sciences, Columbia University, New York, New York 10027, USA.

Current Biology : CB
|February 21, 1998
PubMed
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Hedgehog (Hh) signaling in Drosophila prevents the breakdown of the Cubitus interruptus (Ci) transcription factor. This regulation shifts Ci from a repressor to an activator of Hh-target genes.

Area of Science:

  • Developmental biology
  • Molecular signaling pathways
  • Genetics

Background:

  • Hedgehog (Hh) signaling is crucial for embryonic development.
  • The transcription factor Cubitus interruptus (Ci) is a key mediator of Hh signaling.
  • Regulation of Ci activity determines the response to Hh pathway activation.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which Hh signaling regulates Ci.
  • To understand how Ci transitions from a repressor to an activator state.
  • To investigate the role of Costal-2 in Hh pathway regulation.

Main Methods:

  • Biochemical assays to study protein interactions and modifications.
  • Microtubule binding assays.
  • Analysis of gene expression in Drosophila models.

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Main Results:

  • Hh signaling inhibits the partial proteolysis of Ci.
  • Hh signaling affects the microtubule-binding ability of the Ci-Costal-2 complex.
  • These regulatory events are linked to the transcriptional activity of Ci.

Conclusions:

  • Hh signaling controls Ci activity through post-translational modification and altered protein complex behavior.
  • The regulation of Ci by Hh signaling is essential for proper target gene activation.
  • Costal-2 plays a significant role in mediating Hh pathway effects on Ci.