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Published on: February 15, 2021
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Spatial Transcriptomics Reveals Regional and Temporal Dynamics of Gene Expression in the Mouse Brain Across
Benjamin Conacher1,2, Amanda Moore1,3, Liduo Yin1,3
1Epigenomics and Computational Biology Lab, Fralin Life Sciences Institute, Virginia Tech, Blacksburg, VA 24061, USA.
Biology
|June 26, 2025
Summary
Brain development and aging involve distinct molecular pathways, not a simple reversal. This study reveals unique gene expression dynamics across the lifespan, highlighting different regulatory programs for maturation versus decline.
Area of Science:
- Neuroscience
- Genomics
- Molecular Biology
Background:
- Understanding brain development and aging is crucial for insights into function and decline.
- Limited direct molecular comparisons exist between late-stage brain development and aging.
- Aging is speculated to be a reversal of late-stage brain development, but molecular evidence is scarce.
Purpose of the Study:
- To compare molecular mechanisms of brain development and aging using spatial transcriptomics.
- To identify region-specific gene expression dynamics across the mouse brain lifespan.
- To investigate if aging represents a reversal of brain development at the molecular level.
Main Methods:
- Spatial transcriptomics analysis of mouse brains at three timepoints: postnatal day 21 (P21), 3 months (adult), and 28 months (aged).
- Identification of region-specific differential gene expression dynamics.
- Analysis of enriched pathways during development and aging.
Main Results:
- Widespread transcriptional changes observed in both brain development and aging, with distinct region-specific dynamics.
- Development showed enrichment in neurogenesis, synaptic plasticity, and myelination.
- Aging exhibited decreased myelination gene expression and increased inflammatory/glial activation pathways, especially in the hippocampus.
Conclusions:
- Neural maturation and age-related decline are driven by fundamentally different regulatory programs, despite some pathway overlap.
- Developmental myelination supports circuit formation, while aging-related changes may stem from neuroinflammation.
- This study provides a spatial transcriptomic reference for brain development and aging, aiding research into neurodevelopmental and neurodegenerative mechanisms.
