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Sensory activity affects sensory axon development in C. elegans.

E L Peckol1, J A Zallen, J C Yarrow

  • 1Howard Hughes Medical Institute, Department of Anatomy and Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94143-0452, USA.

Development (Cambridge, England)
|April 2, 1999
PubMed
Summary

Sensory activity, not just genetics, shapes nerve cell structure in C. elegans. Disrupting sensory input leads to abnormal axon growth, revealing activity

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • The nematode C. elegans has a simple nervous system with 302 neurons.
  • Neuron morphology is typically reproducible, suggesting a predetermined axon guidance program.
  • The role of neuronal activity in shaping axon morphology was previously unclear.

Purpose of the Study:

  • To investigate the influence of sensory activity on sensory axon morphology in C. elegans.
  • To identify molecular mechanisms linking neuronal activity to nervous system structure.

Main Methods:

  • Analysis of C. elegans mutants with deformed sensory cilia.
  • Investigating mutations affecting calcium channels and membrane potential.
  • Cell-specific perturbations of sensory activity.

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Main Results:

  • Mutants with defective sensory cilia exhibit extra axon branches, indicating sensory deprivation disrupts axon outgrowth.
  • Alterations in calcium channels or membrane potential induce similar axon morphology defects.
  • Cell-autonomous changes in axon morphology occur due to sensory activity perturbations.
  • Sensory activity affects the maintenance of axon morphology after initial innervation.

Conclusions:

  • Neuronal activity plays a crucial role in shaping and maintaining sensory axon morphology in C. elegans.
  • C. elegans provides a tractable model for studying activity-dependent nervous system development.
  • Identified molecular mechanisms link neuronal activity to nervous system structure.