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Related Experiment Videos

Complementary Gli activity mediates early patterning of the mouse visual system.

Marosh Furimsky1, Valerie A Wallace

  • 1Molecular Medicine Program, Ottawa Health Research Institute and University of Ottawa Eye Institute, Ottawa, Ontario, Canada. mfurimsky@ohri.ca

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|December 13, 2005
PubMed
Summary

Sonic hedgehog (Shh) signaling regulates eye development via Gli transcription factors. Midline Shh signaling modulates Gli activity, promoting eye pattern formation and specifying key ocular structures.

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Area of Science:

  • Developmental biology
  • Molecular biology
  • Genetics

Background:

  • The Sonic hedgehog (Shh) signaling pathway is crucial for vertebrate central nervous system development, including ocular structures.
  • Gli transcription factors (Gli1, Gli2, Gli3) mediate Shh signaling, controlling gene expression through activation and repression.
  • Understanding the specific roles of Gli proteins in eye development is essential for comprehending pattern formation.

Purpose of the Study:

  • To investigate the roles of Gli1, Gli2, and Gli3 in mediating midline Shh signaling during early ocular development.
  • To elucidate how Shh signaling influences proximodistal and dorsoventral patterning in the developing eye.

Main Methods:

  • Analysis of ocular phenotypes in Shh and Gli combination mutant mouse embryos.

Related Experiment Videos

  • In situ hybridization to monitor the expression of key eye development regulatory genes.

    • Main Results:

    • Midline Shh signaling alleviates Gli3 repressor activity near the midline.
    • All three Gli proteins (Gli1, Gli2, Gli3) exhibit nonredundant activities essential for eye pattern formation.
    • Gli3 is specifically required for dorsal optic stalk specification and defining the optic stalk-optic cup boundary.

    Conclusions:

    • Midline Shh signaling orchestrates eye development through the differential activities of Gli transcription factors.
    • Gli3 plays a critical role in establishing ocular structures and boundaries during embryonic development.