Single-cell transcriptomic analysis of Alzheimer's disease

Area of Science:

• Neuroscience
• Genomics
• Molecular Biology

Background:

• Alzheimer's disease (AD) is a complex neurodegenerative disorder with poorly understood molecular mechanisms.
• Existing research often lacks cell-type specific resolution for AD pathology.

Purpose of the Study:

• To investigate the molecular and cellular heterogeneity of Alzheimer's disease using single-nucleus transcriptomics.
• To identify cell types and pathways most affected by AD pathology across disease progression.

Main Methods:

• Analysis of 80,660 single-nucleus transcriptomes from the prefrontal cortex of 48 individuals with varying AD pathology.
• Identification and characterization of transcriptionally distinct cell subpopulations across six major brain cell types.

Main Results:

• Discovered cell-type specific subpopulations associated with AD, involving myelination, inflammation, and neuron survival regulators.
• Observed early, specific transcriptional changes in disease progression, with late-stage genes related to global stress response.
• Identified sex-specific transcriptional differences and overrepresentation of female cells in disease-associated subpopulations.

Conclusions:

• Myelination processes are recurrently perturbed across multiple cell types, suggesting a key role in Alzheimer's disease pathophysiology.
• The study provides a valuable single-cell transcriptomic resource for understanding the molecular basis of AD.
• Sex differences in cellular responses are critical for understanding AD pathogenesis.