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Ablation of a Neuronal Population Using a Two-photon Laser and Its Assessment Using Calcium Imaging and Behavioral Recording in Zebrafish Larvae
Published on: June 2, 2018
Hardwiring of fine synaptic layers in the zebrafish visual pathway
Linda M Nevin1, Michael R Taylor, Herwig Baier
1Department of Physiology, University of California, San Francisco, CA 94158, USA. linda.nevin@gmail.com
Neural Development
|December 18, 2008
Summary
Synaptic layering in the zebrafish visual system does not require neural activity. Genetically encoded cues appear sufficient for organizing neuronal connections into precise layers during development.
Area of Science:
- Neuroscience
- Developmental Biology
- Visual System Research
Background:
- Neuronal connections form layered structures with sublaminae for specific synaptic properties.
- The developmental mechanisms establishing fine-grained synaptic layering remain debated.
- Investigated synaptic organization in the zebrafish retina's inner plexiform layer (IPL) and optic tectum.
Purpose of the Study:
- To determine if neural activity is required for synaptic lamination in the zebrafish visual pathway.
- To investigate the role of light-evoked and activity-dependent mechanisms in visual system development.
Main Methods:
- Examined synaptic lamination in larval zebrafish (5 days old).
- Utilized transgenic fluorescent reporters and immunohistochemistry to identify sublaminae.
- Disrupted retinal activity via dark rearing and pharmacological agents (D, L-amino-phosphono-butyrate).
- Eliminated chemical synaptic transmission using Botulinum toxin B.
Main Results:
- Identified at least nine sublaminae in the IPL and distinct retinal input layers in the optic tectum.
- Dark rearing and reduced retinal activity did not alter IPL or tectal lamination.
- Complete blockade of chemical synaptic transmission did not affect synaptic layer formation.
Conclusions:
- Activity-dependent mechanisms, including light signals and synaptic plasticity, are not essential for the examined synaptic stratification.
- Genetically encoded cues are likely sufficient for targeting neurites to specific synaptic layers.
- Challenges the necessity of neural activity in establishing precise synaptic organization in this visual system.
