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Related Experiment Videos

How does cholesterol affect the way Hedgehog works?

Franz Wendler1, Xavier Franch-Marro, Jean-Paul Vincent

  • 1MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.

Development (Cambridge, England)
|July 29, 2006
PubMed
Summary
This summary is machine-generated.

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Hedgehog (Hh) protein

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Biology

Background:

  • Hedgehog (Hh) proteins are crucial morphogens regulating cell fate during development.
  • Mature Hh proteins are modified with lipid adducts: a palmitoyl group (N-terminus) and cholesterol (C-terminus).
  • Lipid modifications significantly influence Hh protein function and intercellular transport.

Purpose of the Study:

  • To investigate the role of lipid modifications, specifically cholesterol, in Hh protein function and tissue distribution.
  • To clarify the impact of cholesterol modification on Hh signaling and spread within target tissues.
  • To address the ongoing controversy regarding the precise function of the cholesterol adduct in Hh transport.

Main Methods:

  • Analysis of Hh protein function and transport in Drosophila models.

Related Experiment Videos

  • Investigating the effects of removing the cholesterol adduct from mature Hh.
  • Comparing the functional consequences of palmitoylation versus cholesterolation.

    • Main Results:

    • The palmitoyl adduct is essential for Hh signaling.
    • Cholesterol modification is not strictly required for Hh signaling activity.
    • Absence of the cholesterol adduct demonstrably affects the spread of Hh within tissues, though the exact mechanism remains debated.

    Conclusions:

    • While palmitoylation is critical for Hh signaling, cholesterolation plays a distinct role in modulating Hh distribution.
    • The precise contribution of the cholesterol adduct to Hh tissue spread requires further elucidation.
    • Understanding these lipid modifications is key to deciphering Hh morphogen activity.