Effect of Age and Sex on Brain Cell Types
Author Information
Author(s): Autio-Kimura Arttu, Nevalainen Tapio, Hurme Mikko
Primary Institution: Tampere University, Tampere, Finland
Hypothesis
How do age and sex differences affect the abundances of neuronal, glial, and endothelial cells in non-diseased brain tissue?
Conclusion
Both age and sex significantly influence the proportions of different cell types in the brain, with notable increases in astrocytes and endothelial cells and decreases in neurons as age increases.
Supporting Evidence
- The proportion of neurons decreases with age, while astrocytes and endothelial cells increase.
- Significant sex-based differences were observed in cell type proportions, with males having more excitatory neurons and females having more microglia.
- Age-associated changes in cell type proportions were only statistically significant in male donors for neurons and astrocytes.
Takeaway
As people get older, their brains have more support cells and fewer nerve cells, and this change is different for men and women.
Methodology
RNA sequencing data from the GTEx project was analyzed to estimate the proportions of different brain cell types using a deconvolution-based analysis.
Potential Biases
Potential biases may arise from the use of reference datasets that do not account for age- and sex-specific expression differences.
Limitations
The study's cell type proportion estimations are relative rather than absolute, which limits comparisons of age-associated changes.
Participant Demographics
Samples were derived from 249 individuals aged 20 to 70, with 493 from females and 1153 from males.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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