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Function for Hedgehog genes in zebrafish retinal development.

D L Stenkamp1, R A Frey, S N Prabhudesai

  • 1Department of Biological Sciences, University of Idaho, Moscow, Idaho 83844-3051, USA.

Developmental Biology
|February 7, 2001
PubMed
Summary
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Hedgehog (hh) genes, sonic hedgehog (shh) and tiggy-winkle hedgehog (twhh), regulate zebrafish eye development. They propagate photoreceptor differentiation across the developing retina, crucial for eye formation.

Area of Science:

  • Developmental Biology
  • Genetics
  • Ophthalmology

Background:

  • Hedgehog (hh) genes are crucial secreted signaling proteins in development.
  • In Drosophila, hh genes coordinate retinal development and photoreceptor differentiation.
  • Vertebrate hh genes' roles in eye development are less understood.

Purpose of the Study:

  • To investigate the function of sonic hedgehog (shh) and tiggy-winkle hedgehog (twhh) in zebrafish retinal development.
  • To determine if hh genes propagate photoreceptor differentiation in zebrafish eyes.

Main Methods:

  • Analyzing expression patterns of shh and twhh in embryonic zebrafish retinas.
  • Using antisense oligonucleotides to inhibit hh gene expression.
  • Examining zebrafish mutants in the Hh signaling pathway.

Related Experiment Videos

Main Results:

  • shh and twhh are expressed in the retinal pigmented epithelium (RPE) and expand with photoreceptor recruitment.
  • Inhibition of hh genes by antisense oligonucleotides slowed photoreceptor differentiation.
  • Mutations in Hh signaling pathway genes also retarded photoreceptor differentiation.

Conclusions:

  • Vertebrate hedgehog genes (shh and twhh) play a role in zebrafish retinal development.
  • Hedgehog signaling likely propagates photoreceptor differentiation across the developing eye.
  • This suggests conserved functions of hh genes in eye development across species.