Imaging axon pathfinding in zebrafish in vivo.

Area of Science:

• Neuroscience
• Developmental Biology
• Cell Biology

Background:

• Axon pathfinding is a dynamic process crucial for neural circuit formation.
• Growth cones make rapid decisions in response to environmental cues during development.
• In vivo visualization is essential for understanding growth cone behavior and molecular signaling.

Purpose of the Study:

• To describe a protocol for live imaging of axon pathfinding in zebrafish embryos.
• To enable high-resolution, long-term observation of axonal growth cones in vivo.
• To facilitate the study of molecular mechanisms underlying axon guidance decisions.

Main Methods:

• Stabilization and preparation of live zebrafish embryos for microscopy.
• Imaging of fluorescently labeled axonal tracts at high spatial and temporal resolution.
• Utilizing zebrafish's ex utero development for accessibility to major axon tracts.

Main Results:

• The protocol allows for imaging up to 72 hours in live zebrafish embryos.
• High spatial and temporal resolution imaging of axon pathfinding is achievable.
• The method has been successfully applied to retinotectal axon pathfinding.

Conclusions:

• This protocol provides a powerful tool for studying axon pathfinding in vivo.
• Zebrafish embryos are a suitable model for live imaging of neural development.
• The technique can be adapted to investigate various axon tracts and molecular players.