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Imaging spinal neuron ensembles active during locomotion with genetically encoded calcium indicators
Christopher A Hinckley1, Samuel L Pfaff
1Howard Hughes Medical Institute and Gene Expression Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
Annals of the New York Academy of Sciences
|March 28, 2013
Summary
New genetic tools reveal that V1 interneurons, crucial for movement, do not share identical activity patterns despite common origins. This finding advances understanding of neural circuit function.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Advances in molecular-genetic tools and genetic probes for neural activity are revolutionizing neural circuit research.
- Understanding the functional organization of neural circuits requires cellular-resolution activity detection in identified neuron types during behavior.
Purpose of the Study:
- To characterize V1 interneurons using genetically encoded calcium indicators (GECIs) and two-photon microscopy.
- To investigate the activity patterns of V1 interneurons, which are critical for regulating the step cycle duration.
Main Methods:
- Utilized genetically encoded calcium indicators (GECIs) for neural activity detection.
- Employed two-photon microscopy for high-resolution imaging of neuronal ensembles.
- Focused on V1 interneurons originating from a common precursor population expressing engrailed-1 (En1).
Main Results:
- Demonstrated that V1 interneurons, despite arising from a common developmental lineage and sharing features like projection patterns and neurotransmitter profiles, exhibit distinct activity patterns.
- Showed that neighboring interneurons are not irrevocably committed to identical functional activity.
Conclusions:
- Neighboring V1 interneurons, originating from the same precursor, do not necessarily exhibit the same activity patterns.
- This highlights the functional diversity within seemingly homogeneous neuronal populations and advances understanding of neural circuit dynamics.
