Revealing cell vulnerability in Alzheimer's disease by single-cell transcriptomics

Area of Science:

• Neuroscience
• Genomics
• Molecular Biology

Background:

• Alzheimer's disease (AD) is a neurodegenerative disorder impacting memory circuits.
• Understanding cell-specific responses is crucial for unraveling AD pathogenesis.
• Single-cell transcriptomics offers a powerful tool for molecular analysis of postmortem brain tissue.

Purpose of the Study:

• To review single-cell transcriptomic studies analyzing Alzheimer's disease (AD) patient brains.
• To decipher cell-specific gene expression programs and biological pathways affected in AD.
• To highlight the potential of cell transcriptomics for AD research and personalized medicine.

Main Methods:

• Review of high-throughput single-cell transcriptomic studies on postmortem AD brain tissue.
• Analysis of cell-specific gene signatures and biological networks across major brain cell types.
• Integration of transcriptional data with AD pathology and clinical symptoms.

Main Results:

• Identified specific and common gene signatures in astrocytes, endothelial cells, microglia, neurons, and oligodendrocytes in AD brains.
• Linked cell-type-specific transcriptomes to pathways including synaptic function, inflammation, proteostasis, cell death, oxidative stress, and myelination.
• Revealed a spatiotemporal pattern of cell diversity, affected pathways, and novel cell subpopulations in AD.

Conclusions:

• Single-cell transcriptomics provides a detailed view of cell-specific responses in Alzheimer's disease.
• Broader implementation in larger cohorts with standardized protocols is essential for reliable profiling.
• This methodology holds promise for future personalized diagnosis and treatment strategies in dementia.