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Spatially resolved transcriptome of the aging mouse brain.

Cheng Wu1, Tianxiang Tu1, Mingzhe Xie1

  • 1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China.

Aging Cell
|February 19, 2024
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Summary

Spatial transcriptomics reveals how gene expression and cell types change across mouse brain regions during aging. This atlas identifies aging-related genes and pathways, offering insights into cognitive decline and neurodegeneration.

Keywords:
agingbraincell typesgene expressionspatial transcriptome

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Area of Science:

  • Neuroscience
  • Genomics
  • Aging Research

Background:

  • Brain aging is linked to cognitive decline and neurodegenerative diseases.
  • Understanding spatial gene expression and cell types in the aging brain is limited.

Purpose of the Study:

  • To generate spatial transcriptomic maps of young and old mouse brains.
  • To characterize spatial-specific changes in gene expression and cell types during brain aging.
  • To identify aging-related genes, pathways, and regional interactions.

Main Methods:

  • Spatial transcriptomics to map gene expression in 27 distinct brain domains.
  • Integration with single-cell transcriptomics to analyze cell type distribution.
  • Quantitative PCR (qPCR) and immunohistochemistry for validation.

Main Results:

  • Identified 27 spatial domains with layer-specific subregions.
  • Characterized spatial gene expression changes in isocortex, hippocampus, brainstem, and fiber tracts.
  • Observed decreased immature neurons in the DG region, suggesting blocked neurogenesis.
  • Detected deregulated pathways, including WNT and COLLAGEN signaling, and altered inter-regional interactions.

Conclusions:

  • Established a spatial molecular atlas of the aging mouse brain.
  • Provided novel insights into the molecular mechanisms of brain aging.
  • Identified region-specific aging-related genes and pathways crucial for understanding brain function decline.