Differences in human cortical gene expression match the temporal properties of large-scale functional networks

Area of Science:

• Neuroscience
• Genetics
• Computational Biology

Background:

• Functional cortical networks are organized into two major rings: Visual-Sensorimotor-Auditory (VSA) for real-time processing and Parieto-Temporo-Frontal (PTF) for cognitive functions.
• Previous research suggests these networks process information differently based on their anatomical and functional segregation.

Purpose of the Study:

• To investigate the relationship between cortical functional organization and gene expression patterns.
• To determine if gene expression can predict the functional network membership of cortical regions.

Main Methods:

• Utilized correspondence analysis and discriminant correspondence analysis on gene expression data from the Allen Human Brain Atlas.
• Analyzed the expression patterns of 938 differentially expressed genes across the cortex.
• Examined proteins coded by genes differentiating the two proposed cortical rings.

Main Results:

• Gene expression patterns successfully organized cortical regions into two sets matching the VSA and PTF functional networks.
• Genetic profiles accurately predicted a cortical region's network membership.
• Proteins involved in neuronal information processing, such as ion channels and neurotransmitter release, showed differential expression between the rings.
• VSA-associated genes favored fast neural transmission, while PTF-associated genes supported slower, sustained, or rhythmic activity.

Conclusions:

• Strong congruence exists between gene expression, protein function, and the preferred processing modes of the VSA and PTF cortical networks.
• Specific ion channels and release-related proteins are preferentially expressed in each ring, correlating with their distinct temporal processing roles.