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Basic Science and Pathogenesis.

Annie J Lee1, Minghua Liu2, David A A Bennett3

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Alzheimer's disease involves both brain and vascular issues. This study found distinct molecular pathways for neurodegenerative and vascular components, offering new therapeutic targets for Alzheimer's disease.

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Area of Science:

  • Neuroscience
  • Genomics
  • Pathology

Background:

  • Alzheimer's Disease (AD) frequently co-occurs with cerebrovascular pathology.
  • Understanding shared and distinct molecular pathways is key to AD progression.

Purpose of the Study:

  • To identify distinct molecular pathways in neurodegenerative versus vascular pathologies in Alzheimer's Disease.
  • To analyze transcriptomic profiles for differentially expressed genes (DEGs) across patient subgroups.

Main Methods:

  • Analyzed 1,092 transcriptomic profiles from the prefrontal cortex of ROS/MAP participants.
  • Classified participants into Neurodegenerative, Vascular, and Mixed subgroups.
  • Conducted pathway enrichment analysis on DEGs to identify biological mechanisms.

Main Results:

  • Neurodegenerative genes enriched in heterochromatin formation, epigenetic regulation, and histone modification pathways.
  • Vascular genes enriched in mitochondrial processes, ATP synthesis, and oxidative phosphorylation.
  • Mixed pathology genes linked to lipid modification, DNA metabolism, and calcium ion response, with minimal pathway overlap.

Conclusions:

  • Distinct molecular pathways identified for neurodegenerative and vascular components in Alzheimer's Disease.
  • These findings highlight divergent biological mechanisms driving AD progression.
  • Insights may inform targeted therapeutic strategies for AD with varied vascular involvement.