Cell type-specific potential pathogenic genes and functional pathways in Alzheimer's Disease

Area of Science:

• Neuroscience
• Genomics
• Molecular Biology

Background:

• Alzheimer's disease (AD) is a complex, age-related neurodegenerative disorder with no effective treatments.
• The intricate cellular environment of the AD brain hinders understanding of its pathogenesis.
• Investigating cell-specific responses is vital for identifying precise therapeutic targets in AD.

Purpose of the Study:

• To comprehensively analyze cell type-specific transcriptional changes in the Alzheimer's disease brain.
• To identify common and distinct differentially expressed genes (DEGs) across multiple cell types.
• To explore dysregulated biological pathways and potential therapeutic targets in AD.

Main Methods:

• Integrated analysis of 4,441 DEGs from 263,370 single-cells (snRNA-seq) in cortex samples from AD patients and controls.
• DEGs were analyzed across microglia, astrocytes, oligodendrocytes, excitatory neurons, inhibitory neurons, and endothelial cells.
• Identified common (3 studies) and overlapping (≥2 studies) DEGs, analyzed their functions, modules, hub genes, and pathways.

Main Results:

• Up-regulated LINGO1 observed in oligodendrocytes and excitatory neurons across all three studies.
• Mitochondrial dysfunction indicated by up-regulated mitochondrial genes across all cell types.
• Estrogen signaling pathway identified as a commonly disrupted pathway in Alzheimer's disease.

Conclusions:

• The study provides detailed cell type-specific and overall transcriptional insights into human AD pathology.
• Identified common and distinct dysregulated pathways across various cell types in AD.
• Findings offer crucial information for developing targeted drug therapies for Alzheimer's disease.