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Related Experiment Videos

Why cavefish are blind.

Natasha M M-L Tian1, David J Price

  • 1Genes and Development Group, Centre for Integrative Physiology, Edinburgh, UK.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|February 17, 2005
PubMed
Summary
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Eyeless cavefish develop through similar processes, where apoptosis of lens cells halts eye development. Increased Sonic hedgehog (Shh) signaling in cavefish embryos reduces Pax6 expression, potentially aiding cave adaptation.

Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Some fish species exhibit distinct surface-dwelling (eyed) and cave-dwelling (eyeless) populations.
  • Eye degeneration in Astyanax cavefish populations follows similar developmental pathways.
  • Apoptosis of lens cells leads to developmental arrest and eye degeneration, despite initial optic primordia formation.

Purpose of the Study:

  • To investigate the developmental mechanisms underlying eye degeneration in Astyanax cavefish.
  • To explore the role of transcription factor Pax6 and morphogen Sonic hedgehog (Shh) in cavefish eye development.

Main Methods:

  • Comparative analysis of developmental processes in eyed and eyeless Astyanax cavefish.
  • Examination of gene expression patterns, specifically focusing on Pax6 and Shh.

Related Experiment Videos

  • Investigating the impact of Shh signaling on Pax6 expression and downstream targets.

    • Main Results:

    • Eye degeneration in cavefish is initiated by apoptosis of lens cells, arresting eye development.
    • Reduced expression of the transcription factor Pax6 in the anterior embryonic midline and optic primordia is associated with eye degeneration.
    • Increased Sonic hedgehog (Shh) expression at the embryonic midline of cavefish correlates with reduced Pax6 expression and upregulation of Shh-regulated genes.

    Conclusions:

    • The developmental basis for eye loss in Astyanax cavefish involves lens cell apoptosis and reduced Pax6 expression.
    • Sonic hedgehog (Shh) signaling pathway modulation appears to be a key factor in the evolution of eyelessness in cavefish.
    • Upregulation of Shh-regulated genes may provide adaptive advantages for survival in subterranean environments.