Related Experiment Video
Updated: Jun 20, 2026
08:24
Zebrafish In Situ Spinal Cord Preparation for Electrophysiological Recordings from Spinal Sensory and Motor Neurons
Published on: April 18, 2017
Zebrafish motor neuron subtypes differ electrically prior to axonal outgrowth.
Rosa L Moreno1, Angeles B Ribera
1Department of Physiology and Biophysics, University of Colorado Denver at Anschutz Medical Campus, Aurora, Colorado 80045, USA. rosa.moreno@ucdenver.edu
Journal of Neurophysiology
|August 21, 2009
Summary
Motor neuron subtypes, identified by muscle targets and gene expression, exhibit distinct electrical properties. These differences in primary motor neurons (PMNs) emerge before axon development and persist.
Area of Science:
- Neuroscience
- Developmental Biology
- Electrophysiology
Background:
- Motor neurons exhibit heterogeneity based on muscle targets and transcription factor expression.
- The electrophysiological properties of these distinct motor neuron subtypes remain largely uncharacterized.
Purpose of the Study:
- To investigate whether primary motor neurons (PMNs) with different muscle targets and transcription factor profiles also exhibit distinct electrical membrane properties.
- To determine if these electrophysiological differences are present early in development, prior to axonogenesis.
Main Methods:
- Studied primary motor neurons (PMNs) in zebrafish embryos.
- Utilized subtype-specific soma locations and axonal trajectories for identification of MiP (middle) and CaP (caudal) PMNs.
- Performed electrophysiological recordings between 17 and 48 hours postfertilization (hpf) to analyze membrane properties and firing behaviors.
Main Results:
- Identified MiP and CaP PMNs as early as 17 hpf, before axon genesis.
- Observed significant differences in voltage-dependent inward and outward currents between MiP and CaP subtypes.
- Demonstrated subtype-specific firing behaviors in MiP and CaP PMNs by 48 hpf.
Conclusions:
- Motor neuron subtypes, defined by muscle targets and transcription factors, acquire distinct electrical membrane properties.
- These electrophysiological differences are established prior to axon genesis and are maintained through early development (up to 2 days postfertilization).
