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Updated: Feb 7, 2026
09:30
Measurement of Larval Activity in the Drosophila Activity Monitor
Published on: April 30, 2015
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Tonically active interneurons gate motor output in Drosophila larvae
Takahisa Date1,2, Yingtao Liu1,2, Akihiro Yamaguchi3
1Department of Physics, Graduate School of Science, The University of Tokyo.
Biorxiv : the Preprint Server for Biology
|February 6, 2026
Summary
Researchers identified A02l neurons in Drosophila that use tonic inhibition to control crawling. These neurons gate motor output, suppressing activity to maintain muscle relaxation and quiescence.
Area of Science:
- Neuroscience
- Developmental Biology
- Motor Control
Background:
- Tonic inhibition is crucial for neural gating and behavioral precision.
- The role of tonic inhibition in locomotor central pattern generators (CPGs) is not well understood.
Purpose of the Study:
- To investigate the function of tonic inhibition in the Drosophila larval locomotor CPG.
- To identify specific neurons involved in regulating crawling behavior through tonic inhibition.
Main Methods:
- Utilized genetic techniques in Drosophila larvae.
- Employed optogenetics to manipulate neuronal activity.
- Recorded and analyzed crawling behavior and neuronal activity.
Main Results:
- Identified A02l neurons as segmentally repeated excitatory interneurons in the ventral nerve cord.
- Demonstrated that A02l neurons exhibit high baseline activity and are transiently suppressed during motor output.
- Showed that A02l neurons provide excitatory input to inhibitory premotor networks, leading to motor neuron silencing and muscle relaxation.
- Optogenetic activation of A02l neurons decreased crawling frequency; inhibition caused transient whole-body contractions.
Conclusions:
- Revealed a cellular mechanism for tonic inhibition in the Drosophila nerve cord.
- Highlighted the importance of tonic inhibition in gating motor output and maintaining motor quiescence during locomotion.
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