A quantitative characterization of early neuron generation in the developing zebrafish telencephalon

Area of Science:

• Developmental neuroscience
• Neurogenesis
• Zebrafish model systems

Background:

• Neuronal diversity arises from neural stem and progenitor cells (NPCs).
• NPCs transition from proliferative to neurogenic divisions, initiating neurogenesis.
• Understanding the timing of this transition is crucial for early brain development.

Purpose of the Study:

• To determine when NPCs initiate neurogenesis in the zebrafish telencephalon.
• To quantitatively analyze NPC division modes and neuron production during early development.

Main Methods:

• Utilized Cellpose, a deep learning segmentation tool.
• Performed clonal analysis of individual NPCs.
• Assessed neuron production and division modes between 14-24 hours postfertilization.

Main Results:

• Generated a quantitative atlas of telencephalic neuron production.
• Observed a gradual switch to neurogenesis within the studied timeframe.
• Identified significant heterogeneity in NPC neurogenic potential and division rates.

Conclusions:

• The onset of neurogenesis in the zebrafish telencephalon is a gradual process.
• Individual NPCs exhibit diverse division behaviors and neurogenic capacities.
• This study provides a foundation for investigating molecular regulators of early neurogenesis.