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Basic Science and Pathogenesis.

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Summary
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The Apolipoprotein E (APOE) gene isoforms influence distinct tau oligomer structures, impacting brain cell function differently. Targeting these APOE-specific tau forms may offer new Alzheimer's disease therapies.

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Area of Science:

  • Neuroscience
  • Genetics
  • Biochemistry

Background:

  • Apolipoprotein E (APOE) is the primary genetic risk factor for late-onset Alzheimer's disease (AD).
  • Three APOE isoforms (APOE2, APOE3, APOE4) differentially affect AD risk and tau pathology.
  • Knowledge gaps exist regarding tau polymorphism across APOE isoforms.

Purpose of the Study:

  • To characterize tau oligomers associated with each APOE isoform.
  • To investigate the impact of APOE isoforms on tau oligomer conformation and function.

Main Methods:

  • Isolation of brain-derived tau oligomers and fibrils from patients with varying APOE genotypes.
  • Proteinase K (PK) digestion and liquid chromatography-tandem mass spectrometry (LC-MS/MS) to assess tau oligomer stability and PK cleavage sites.
  • Electrophysiology to evaluate the synaptotoxicity of tau oligomers.

Main Results:

  • Tau oligomers exhibit distinct proteolytic stability and cleavage site profiles across APOE isoforms, indicating conformationally different polymorphs.
  • These tau oligomer polymorphs differentially impair synaptic function in an APOE isoform-specific manner.
  • APOE4-associated tau oligomers demonstrated the most significant impairment of synaptic functioning.

Conclusions:

  • Distinct APOE isoforms correlate with specific tau oligomer polymorphs possessing varying synaptotoxicity.
  • Therapeutic strategies for Alzheimer's disease must consider APOE isoform.
  • Targeting APOE isoform-specific tau oligomers presents a potential novel therapeutic approach for AD.