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Related Experiment Video

Updated: Dec 14, 2025

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Neuronal Circuits That Control Rhythmic Pectoral Fin Movements in Zebrafish.

Yuto Uemura1,2, Kagayaki Kato1, Koichi Kawakami3

  • 1National Institutes of Natural Sciences, Exploratory Research Center on Life and Living Systems (ExCELLS), National Institute for Basic Biology, Okazaki 444-8787, Aichi, Japan.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 25, 2020
PubMed
Summary

Larval zebrafish pectoral fin movements mimic basic vertebrate locomotion. This study identifies neural circuits controlling these rhythmic movements, revealing a push-pull system involving inhibitory neurons that regulate motor neuron activity.

Keywords:
CPGdmrt3pectoral finrhythmic movementspinal cordzebrafish

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Comparative Physiology

Background:

  • Vertebrate locomotion relies on alternating muscle activity and limb coordination.
  • Larval zebrafish pectoral fin movements display fundamental aspects of this basic locomotion, making them a model for studying central pattern generators (CPGs).

Purpose of the Study:

  • To investigate the neuronal circuits controlling rhythmic pectoral fin movements in larval zebrafish.
  • To identify the role of specific neurons, including dmrt3a-expressing neurons, in regulating motor neuron activity during fin movements.

Main Methods:

  • Utilized transgenic zebrafish expressing GFP in motor neurons (MNs) and candidate CPG neurons.
  • Recorded spiking activities and synaptic inputs of abductor and adductor MNs.
  • Investigated the effect of ablating dmrt3a neurons on motor neuron activity.

Main Results:

  • Abductor and adductor MNs exhibited alternating spiking activity.
  • MNs received rhythmic excitatory and inhibitory synaptic inputs, indicating a push-pull control mechanism.
  • dmrt3a-expressing neurons form inhibitory connections with abductor MNs, and their ablation altered abductor MN spike timing.

Conclusions:

  • Rhythmic pectoral fin movements in larval zebrafish are controlled by a push-pull system of synaptic inputs to motor neurons.
  • Contralateral commissural inhibitory neurons, specifically dmrt3a-expressing neurons, play a crucial role in timing motor neuron firing.
  • This study provides foundational insights into the CPG organization for rhythmic fin movements.