epDevAtlas: Mapping GABAergic cells and microglia in postnatal mouse brains.

Area of Science:

• Neuroscience
• Developmental Biology
• Computational Biology

Background:

• Brain development follows specific growth patterns crucial for function.
• Classical growth charts lack regional and cellular detail.
• High-definition atlases can improve understanding of typical and pathological brain development.

Purpose of the Study:

• To create high-resolution 3D atlases of the early postnatal mouse brain.
• To quantify regional volumetric growth and cell-type specific changes.
• To develop an open-access resource for studying early brain development.

Main Methods:

• Generation of high-resolution 3D brain atlases at multiple postnatal days (P4-P14).
• Utilized Allen CCFv3 anatomical labels and 11 cell type-specific transgenic mouse lines.
• Analysis of volumetric growth and cell densities, including GABAergic neurons, interneurons, and microglia.

Main Results:

• Identified region-specific volumetric growth trajectories in the early postnatal mouse brain.
• Revealed contrasting changes in GABAergic neuronal densities between cortical and striatal areas.
• Observed microglia transitioning to gray matter and increasing in sensory areas correlating with sensory modality emergence.

Conclusions:

• High-definition atlases provide quantitative insights into early brain development.
• Specific neuronal subtypes and microglia play key roles in shaping brain development.
• The created open-access resource facilitates further research into developmental trajectories and disorders.