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Published on: January 12, 2020
Dopamine promotes motor programs underlying substrate tunneling in larval Drosophila
James MacLeod1, Bella Xu Ying1,2,3, Maarten F Zwart1,2,3
1School of Psychology and Neuroscience, University of St Andrews, St Mary's Quad, St Andrews, United Kingdom.
Journal of Neurophysiology
|July 31, 2026
Summary
Dopamine influences fruit fly larvae movement. Activating dopamine neurons promotes tunneling, while inhibiting them reduces it, showing context-dependent motor control.
Area of Science:
- Neuroscience
- Animal Behavior
- Developmental Biology
Background:
- Dopamine is a crucial neuromodulator with varied roles.
- Understanding dopamine's specific functions in motor control is essential.
Purpose of the Study:
- To investigate the role of dopamine in modulating larval Drosophila melanogaster motor programs.
- To determine how dopamine influences movement over and through substrates.
Main Methods:
- Dual-color calcium imaging in dopaminergic and motor neurons.
- Optogenetic manipulation of tyrosine hydroxylase (TH)-expressing neurons in intact larvae.
- Analysis of motor patterns during surface crawling and tunneling.
Main Results:
- Dopamine neuron activity correlated with locomotion.
- Dopamine application biased isolated nervous systems towards forward locomotion.
- Optogenetic activation of TH-neurons promoted tunneling behaviors in larvae.
- Inhibition of TH-neurons reduced tunneling activity.
Conclusions:
- Dopaminergic modulation of locomotion is context-dependent.
- Dopamine shifts central pattern generators to promote specific motor programs like tunneling.
