Related Experiment Video
Updated: May 6, 2026

DiI-Labeling of DRG Neurons to Study Axonal Branching in a Whole Mount Preparation of Mouse Embryonic Spinal Cord
Published on: December 13, 2011
Competitive and non-competitive rules govern activity-dependent axon arbor development in vivo.
Lucia Salatino1, Matías Rodriguez1, Paola V Plazas1,2
1Instituto de Farmacología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires C1121ABG, Argentina.
Spontaneous electrical activity (SEA) guides sensory circuit assembly. Suppressing SEA in zebrafish neurons revealed it controls axon growth and maturation through both competitive and non-competitive mechanisms.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Sensory circuits develop early using spontaneous electrical activity (SEA).
- The precise role of SEA in sensory circuit assembly remains unclear.
- Larval zebrafish lateral line is a model for studying sensory circuit development.
Purpose of the Study:
- To investigate how SEA influences the assembly of sensory circuits in vivo.
- To determine the mechanisms by which SEA regulates axon arbor development and maturation.
Main Methods:
- Utilized larval zebrafish as an in vivo model system.
- Employing mosaic expression of an exogenous potassium channel to suppress electrical activity in single neurons.
- In vivo imaging to observe axon arbor dynamics and morphology.
Main Results:
- SEA was found to regulate axon arbor territory and complexity.
- Suppressed electrical activity led to increased axonal arbor motility and reduced varicosity density, indicating immaturity.
- Demonstrated that arbor territory and branch remodeling are activity-dependent competitive processes.
- Showed varicosity density and branch extension/retraction are regulated by electrical activity independently of neighboring axons.
Conclusions:
- Spontaneous electrical activity plays a critical role in the proper assembly of sensory circuits.
- Both competitive and non-competitive rules govern activity-dependent axon arbor growth and maturation.
- Findings provide in vivo evidence for the multifaceted role of SEA in neural development.
More Related Videos
06:32Microinjection of DNA into Eyebuds in Xenopus laevis Embryos and Imaging of GFP Expressing Optic Axonal Arbors in Intact, Living Xenopus Tadpoles
Published on: September 4, 2019
10:45In Situ Visualization of Axon Growth and Growth Cone Dynamics in Acute Ex Vivo Embryonic Brain Slice Cultures
Published on: October 14, 2021
Related Concept Videos
Action Potential
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Ligand-Gated Ion Channel Receptor: Gating Mechanism
Neurons: The Axon
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment....
Neurogenesis and Regeneration of Nervous Tissue