Organizational Principles of the Primate Cerebral Cortex at the Single-Cell Level.

Area of Science:

• Neuroscience
• Computational Biology
• Genomics

Background:

• The primate cerebral cortex, crucial for cognition, contains billions of neurons, but their organizational principles are not fully understood.
• Understanding neuronal organization is key to deciphering brain function and cognitive processes.

Purpose of the Study:

• To investigate the spatial distribution and organizational principles of neurons within the macaque cerebral cortex.
• To determine if neuronal clustering and collaboration patterns are conserved across different cortical regions and species.

Main Methods:

• Utilized single-cell spatial transcriptomics on over 25 million neuron cells from the entire macaque cortex.
• Analyzed the distribution and cell-type composition of neurons within cortical layers and identified distinct neuronal clusters.

Main Results:

• Neuronal distribution within cortical layers is highly non-random, with over 75% of neurons forming distinct clusters.
• Excitatory neuron clusters primarily showed excitatory-excitatory combinations, while inhibitory clusters contained excitatory-inhibitory combinations.
• Most excitatory and inhibitory neuron clusters formed spatial partnerships, indicating balanced local networks and correlating with specific functional regions.
• These organizational principles were found to be conserved across mouse cortical regions.

Conclusions:

• The primate cerebral cortex exhibits non-random neuronal clustering and collaborative organization at the population level.
• These findings reveal conserved mechanisms of neuronal organization across different brain regions and species.
• The study suggests that similar neuronal population-level mechanisms may underlie function in diverse cortical areas.