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Basic Science and Pathogenesis.

Gabriele Vilkaite1, Lijun An1, Yu Xiao1

  • 1Department of Clinical Sciences Malmö, SciLifeLab, Lund Univerisity, Lund, Sweden.

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Alzheimer's disease involves coordinated cell changes, with one general response to pathology and two sex-specific responses potentially moderating resilience. Understanding these multicellular interactions is key for AD research.

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Area of Science:

  • Neuroscience
  • Genomics
  • Alzheimer's Disease Research

Background:

  • Alzheimer's disease (AD) involves complex transcriptomic changes across multiple cell types.
  • Previous studies often analyzed cell-specific changes in isolation.
  • This study explores the integrated, multicellular transcriptomic landscape associated with AD phenotypes.

Purpose of the Study:

  • To investigate multicellular transcriptomic associations with Alzheimer's disease (AD) phenotypes.
  • To identify coordinated gene expression patterns across different cell types in the brain.
  • To understand how these multicellular responses relate to AD pathology and clinical features.

Main Methods:

  • Analyzed single-nuclei transcriptomics from 427 donors' dorsolateral prefrontal cortex (DLPFC).
  • Generated metacells and identified cell-type-specific gene modules (AGMs).
  • Utilized partial least squares (PLS) analysis to derive multicellular interactions predicting AD pathology and clinical features.

Main Results:

  • Identified 28 AD-related gene modules (AGMs) across 11 cell subtypes.
  • A general component (Component 1) reflected increased pathology, associated with amyloid-beta, tau, and TDP-43.
  • Sex-specific components (Component 2 for men, Component 3 for women) indicated resilience, linked to age and differing associations with pathology.

Conclusions:

  • Concurrent transcriptomic shifts across multiple cell types are associated with AD pathology.
  • Component 1 represents a generalized response to neurodegeneration, potentially involving neuronal death.
  • Sex-specific multicellular responses suggest distinct resilience mechanisms in AD, highlighting the importance of cross-cellular interactions.