Comparative anatomy of marmoset and mouse cortex from genomic expression

Area of Science:

• Neuroscience
• Comparative Genomics
• Evolutionary Biology

Background:

• Mouse models are crucial for studying cognition and psychiatric disorders.
• Understanding human brain development requires bridging mouse neurobiology with human relevance.
• The common marmoset is a promising non-human primate model for bridging mouse and human studies.

Purpose of the Study:

• To compare marmoset and mouse brain gene expression patterns.
• To investigate principles of cortical development and evolution.
• To identify conserved and divergent genetic organization between species.

Main Methods:

• Gene expression analysis in marmoset brain.
• Comparison with existing mouse brain atlas expression data.
• Focus on cortical and subcortical regions including the thalamus, visual cortex, prefrontal cortex, and hippocampus.

Main Results:

• Most genes showed conserved expression between marmoset and mouse brains.
• Strikingly divergent expression patterns were observed for certain markers.
• The thalamus showed diversification, early visual cortex exhibited marmoset-specific patterns, and prefrontal cortex displayed distinct areal and layer labeling.

Conclusions:

• Cortical areas are largely genetically conserved between marmoset and mouse.
• Differences in areal parcellation, afferent connections, and layer complexity are linked to specific genes.
• Marmoset gene expression patterns provide clues to the molecular evolution of cortical and cognitive expansion.