Comparative Analysis Identifies Similarities between the Human and Murine Microglial Sensomes

Area of Science:

• Neuroscience
• Immunology
• Genetics

Background:

• Microglia, the brain's immune cells, continuously monitor their environment using a specific gene set called the sensome.
• The sensome comprises highly expressed surface receptors crucial for microglial environmental sensing and adaptation.

Purpose of the Study:

• To update the mouse microglial sensome by integrating new RNA sequencing data.
• To identify the human microglial sensome using independent human microglia RNA sequencing datasets.
• To determine conserved and species-specific genes between mouse and human microglial sensomes.

Main Methods:

• Integrated an additional RNA sequencing dataset to refine the mouse microglial sensome.
• Analyzed two independent human microglia RNA sequencing datasets to identify the human sensome.
• Compared mouse and human sensomes to identify conserved genes, defining the "microglia core sensome" (57 genes).
• Examined the expression of core sensome genes in datasets from two neurodegenerative disease models.

Main Results:

• Identified a conserved "microglia core sensome" of 57 genes shared between mouse and human microglia.
• Observed species-specific differences in microglial sensome gene sets.
• Found that changes in microglial sensome gene expression are specific to the disease or condition studied.
• Demonstrated that microglial sensome gene expression patterns vary across different neurodegenerative disease models and stages.

Conclusions:

• The study defines a "microglia core sensome" crucial for understanding microglial biology.
• Results underscore the utility of mouse models for human microglia research while highlighting the need for species-specific gene sets.
• The identified core sensome can aid in identifying pathological microglial changes in human diseases and mouse models.