Mapping Cell Types in the Primate Cortex Provides Insights into Brain Organization

A team of nearly 100 scientists has successfully mapped the cell-type taxonomy in the macaque cortex, shedding light on the composition and spatial distribution of cells in the primate brain. Using spatial transcriptome sequencing technology, the researchers developed a comprehensive three-dimensional single-cell atlas of the macaque cortex. The study, published in Cell, provides valuable molecular and cellular insights into the neural circuits and lays the foundation for further investigations into brain disorders.

Primates, including macaques, possess complex neural circuits crucial for advanced cognition and behavior. Understanding the organization and relationships between different cell types in the brain is essential for unraveling the mysteries of brain function and disorders. The study employed Stereo-seq and snRNA-seq technologies to create a comprehensive single-cell atlas of the macaque cortex, spanning hundreds of distinct brain regions. This atlas serves as a guide for analyzing cell-type distribution specificity and regional patterns within the cortex.

The researchers discovered that different cell types, including glutamatergic neurons, GABAergic neurons, and non-neuronal cells, exhibited distinct distribution patterns throughout the cerebral cortex. Notably, the cell-type composition correlated with the hierarchical organization of brain regions in the visual and somatosensory systems. Brain regions at the same hierarchical level displayed similar cell-type compositions, revealing a relationship between cell composition and brain region structure.

Cross-species comparisons with human and mouse brains highlighted the identification of primate-specific glutamatergic neurons predominantly located in layer 4. These neurons expressed genes associated with human diseases, offering potential insights into neurological disorders.

The study's comprehensive dataset, accessible to the public, provides a valuable resource for future research on brain diseases, structural evolution, and molecular mechanisms of brain function. The findings offer a significant step forward in our understanding of the primate cortex and pave the way for further investigations into the complexities of the human brain.