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Published on: February 25, 2009
The neural circuits and synaptic mechanisms underlying motor initiation in C. elegans
Beverly J Piggott1, Jie Liu, Zhaoyang Feng
1Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA.
Cell
|November 15, 2011
Summary
Scientists mapped neural circuits controlling backward movement in C. elegans. A disinhibitory and stimulatory circuit, using distinct glutamate receptors, work together to initiate this behavior, offering insights into motor control.
Area of Science:
- Neuroscience
- Behavioral Biology
- Genetics
Background:
- The nematode C. elegans is a model organism for studying neural circuits and gene function in behavior.
- Backward locomotion initiation in C. elegans is crucial for directional changes but its neural circuitry is not fully understood.
Purpose of the Study:
- To elucidate the neural circuits and synaptic mechanisms underlying backward movement initiation in freely behaving C. elegans.
- To investigate the role of glutamatergic transmission and specific glutamate receptors in motor control.
Main Methods:
- Integrated functional imaging, optogenetic interrogation, genetic manipulation, laser ablation, and electrophysiology in C. elegans.
- Behavioral analysis of locomotion and neural activity in response to sensory cues.
Main Results:
- Identified a disinhibitory circuit and a stimulatory circuit that cooperate to promote backward movement initiation.
- Demonstrated differential regulation of circuit dynamics by sensory cues.
- Showed that both circuits require glutamatergic transmission but utilize distinct glutamate receptors.
Conclusions:
- A dual-mode motor initiation control strategy involving disinhibitory and stimulatory circuits is conserved across species, including mammals.
- Multidisciplinary approaches are effective for dissecting complex neural circuit mechanisms underlying behavior in model organisms.
