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Alzheimer's Imaging Consortium.

Xuan Chen1, Xue Wang1, Joseph S Reddy1

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Summary
This summary is machine-generated.

Researchers identified blood-based gene expression patterns linked to Alzheimer's disease (AD) and cognitive decline. These novel blood biomarkers may offer insights into brain changes beyond traditional markers.

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Area of Science:

  • Neuroscience
  • Genomics
  • Biomarker Discovery

Background:

  • Existing Alzheimer's disease (AD) biomarkers primarily focus on central nervous system pathologies (amyloid, tau, neurodegeneration).
  • AD pathogenesis is complex and heterogeneous, necessitating accessible blood-based biomarkers reflecting brain molecular changes beyond core pathologies.

Purpose of the Study:

  • To identify blood transcriptome signatures associated with Alzheimer's disease (AD) and mild cognitive impairment (MCI).
  • To explore associations between blood gene expression patterns and cognitive function and neuroimaging measures.
  • To validate blood-brain molecular connections for novel biomarker development.

Main Methods:

  • Analyzed peripheral blood transcriptome data from the Mayo Clinic Study of Aging (MCSA) and Alzheimer's Disease Neuroimaging Initiative (ADNI) cohorts.
  • Utilized Weighted Gene Co-expression Network Analysis (WGCNA) to identify gene modules associated with AD/MCI, cognition, and neuroimaging.
  • Confirmed module preservation in bulk brain RNA-seq data and performed cell-type enrichment and Gene Ontology (GO) analyses.

Main Results:

  • Identified specific blood transcriptome modules (M5, M8 upregulated; M1, M10, M13, M16, M21 downregulated) associated with AD/MCI diagnosis and cognitive performance.
  • Module M17 correlated with increased microhemorrhages.
  • Cell-type enrichment revealed associations with immune cells (basophils, monocytes, neutrophils, natural killer cells, B cells, megakaryocytes); module M1 transcripts linked to better cognition and B cell metabolic activity.

Conclusions:

  • Discovered blood transcripts and modules significantly associated with AD/MCI, cognition, and neuroimaging.
  • Three modules demonstrated preservation across blood and brain, representing peripheral molecular signatures of central brain pathways.
  • These findings highlight potential novel blood biomarkers and therapeutic targets for AD/MCI.