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Related Experiment Videos

Functional analysis of zebrafish GDNF.

I T Shepherd1, C E Beattie, D W Raible

  • 1Department of Biological Structure, University of Washington, Seattle, Washington 98195, USA.

Developmental Biology
|March 10, 2001
PubMed
Summary

Glial cell line-derived neurotrophic factor (GDNF) is crucial for zebrafish enteric nervous system development. However, GDNF is not essential for kidney or primary motor neuron development in zebrafish.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Genetics

Background:

  • Glial cell line-derived neurotrophic factor (GDNF) and its receptor GFRalpha1 play vital roles in nervous system development.
  • Understanding GDNF/GFRalpha1 function in zebrafish offers insights into conserved developmental mechanisms.

Purpose of the Study:

  • To identify and characterize zebrafish orthologues of GDNF and GFRalpha1.
  • To investigate the expression patterns and functional significance of GDNF and GFRalpha1 in developing zebrafish.
  • To determine the role of GDNF in the development of the primary motor neurons (PMN), kidney, and enteric nervous systems (ENS).

Main Methods:

  • Identification of zebrafish GDNF and GFRalpha1 orthologues.
  • Analysis of mRNA expression patterns during development using in situ hybridization.
  • Ectopic overexpression of GDNF in somitic muscle.
  • GDNF protein depletion using morpholino antisense oligos.

Main Results:

  • Correlated expression of GDNF and GFRalpha1 suggests functional interactions in the developing spinal cord, kidney, and ENS.
  • Zebrafish GDNF expression patterns show conservation with mammalian and avian systems.
  • Ectopic GDNF overexpression perturbed CaP motor axon growth.
  • GDNF depletion critically impaired ENS development but had no significant effect on kidney or PMN development.

Conclusions:

  • GDNF plays a critical, conserved role in the development of the enteric nervous system in zebrafish.
  • GDNF is dispensable for the development of the kidney and primary motor neurons in zebrafish, despite correlated expression patterns.
  • The study highlights the tissue-specific functions of GDNF during vertebrate development.

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