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The hedgehog signaling network.

M Michael Cohen1

  • 1Department of Oral & Maxillofacial Sciences, Dalhousie University, Halifax, Nova Scotia, Canada. r.maclean@dal.ca

American Journal of Medical Genetics. Part A
|October 14, 2003
PubMed
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The Hedgehog signaling network regulates development and is implicated in diseases like cancer. This pathway involves lipid-modified Hedgehog ligands, transport proteins, and receptor interactions to control gene transcription.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Signaling

Background:

  • The Hedgehog signaling network is crucial for embryonic development.
  • Dysregulation of this pathway is linked to various human diseases, including cancers like basal cell carcinoma and medulloblastoma.
  • Mutations in the Hedgehog pathway lead to developmental abnormalities such as holoprosencephaly and nevoid basal cell carcinoma syndrome.

Purpose of the Study:

  • To elucidate the molecular mechanisms of Hedgehog ligand transport and signal transduction.
  • To detail the components and interactions within the Hedgehog signaling cascade.
  • To highlight the role of feedback loops in regulating pathway activity.

Main Methods:

  • Review of existing literature on Hedgehog signaling components and their functions.

Related Experiment Videos

  • Analysis of protein-protein interactions and cellular localization.
  • Description of genetic and molecular pathways involved in signal transmission.

    • Main Results:

    • Active Hedgehog ligand is a double lipid-modified protein requiring specific transport mechanisms (multimerization, Dispatched, heparan sulfate proteoglycan).
    • Hedgehog binds to Patched receptor, releasing Smoothened for downstream signaling involving Gli transcription factors.
    • Target genes, including Patched, are upregulated, creating a negative feedback loop to balance pathway activity.

    Conclusions:

    • The Hedgehog signaling network is a complex system with intricate transport and signaling mechanisms.
    • Proper regulation of Hedgehog signaling is essential for normal development and preventing disease.
    • The interplay between Hedgehog and Patched creates a dynamic balance crucial for cellular function.