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Biosensing Motor Neuron Membrane Potential in Live Zebrafish Embryos
Published on: June 26, 2017
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Voltage imaging identifies spinal circuits that modulate locomotor adaptation in zebrafish
Urs L Böhm1, Yukiko Kimura2, Takashi Kawashima3
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.
Neuron
|February 1, 2022
Summary
Researchers discovered a new type of spinal neuron, ventral V3 neurons, that control the strength and duration of swimming in zebrafish. These neurons are critical for adapting motor output during locomotion.
Area of Science:
- Neuroscience
- Motor Control
- Spinal Cord Research
Background:
- Motor systems require continuous adaptation for sustained movement.
- Spinal circuits for locomotion are known, but output modulation remains unclear.
- Recording spinal neuron activity during behavior is challenging.
Purpose of the Study:
- To investigate how spinal networks modulate locomotor output strength.
- To identify neuronal populations controlling swimming intensity and duration.
- To understand the neural basis of locomotor adaptation.
Main Methods:
- Utilized voltage imaging to map neuronal activity in larval zebrafish.
- Recorded membrane potential of glutamatergic neurons during fictive swimming in a virtual environment.
- Employed optogenetics and genetic ablation to manipulate V3 neuron function.
Main Results:
- Identified a novel subpopulation: tonic-spiking ventral V3 neurons.
- V3 neuron spike rate correlated with swimming strength and bout length.
- V3 neuron activation enhanced swimming; ablation reduced adaptation.
Conclusions:
- Ventral V3 neurons are critical drivers of locomotor adaptation.
- Voltage imaging is a powerful tool for studying spinal circuits during behavior.
- These findings advance our understanding of motor control and adaptation.
