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Caliber of Rohon-Beard Touch-Sensory Axons Is Dynamic In Vivo
Kaitlin Ching1, Alvaro Sagasti2
1Department of Cell, Molecular, and Developmental Biology, University of California, Los Angeles, Los Angeles, California 90095, USA kaitlinching@ucla.edu.
Eneuro
|May 9, 2025
Summary
Axon caliber, the diameter of nerve cell projections, varies locally and dynamically in zebrafish neurons. This local variation and dynamic caliber changes are influenced by the surrounding cellular environment.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Cell shape is critical for neuronal function, with axon caliber influencing action potential propagation speed.
- Previous research often assumed static, uniform axon caliber across the entire neuron.
Purpose of the Study:
- To characterize local variations and dynamics of axon caliber in vivo.
- To investigate factors influencing axon caliber in developing neurons.
Main Methods:
- Utilized sparse membrane labeling and super-resolution microscopy in live zebrafish embryos.
- Observed peripheral axons of touch-sensing neurons prior to sex determination.
Main Results:
- Observed varicose (pearled) axon morphologies with caliber varying along their length.
- Found uncorrelated calibers between sister axon segments and tapering across branch points.
- Demonstrated dynamic caliber changes on the timescale of minutes, influenced by factors like adjacent epithelial cell division.
Conclusions:
- Axon caliber exhibits significant local variation and dynamic changes in vivo.
- The cellular microenvironment, including epithelial cell division, can influence axon caliber.
- Spatial and temporal variations in axon caliber may play a crucial role in neuronal physiology.
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