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Basic Science and Pathogenesis.

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Genetic risk in amyloid-beta and endocytosis pathways amplifies tau pathology in Alzheimer's disease. Higher genetic risk exacerbates the link between amyloid exposure duration and tau accumulation, impacting AD progression.

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Area of Science:

  • Neuroscience
  • Genetics
  • Biochemistry

Background:

  • Genome-wide association studies (GWAS) have identified numerous genetic variants linked to Alzheimer's disease (AD) dementia risk.
  • The specific biological pathways connecting single nucleotide polymorphisms (SNPs) to core AD pathologies remain unclear.
  • This study investigates the influence of pathway-specific polygenic risk scores (PRS) on the relationship between amyloid-beta (Aβ) chronicity and tau deposition in AD patients.

Purpose of the Study:

  • To determine if pathway-specific polygenic risk scores modulate the association between amyloid-beta (Aβ) chronicity and tau deposition in Alzheimer's disease (AD).
  • To explore the genetic underpinnings of AD progression by examining interactions between genetic risk and core AD pathologies.

Main Methods:

  • Analysis of 295 amyloid-PET-positive participants from the ADNI cohort.
  • Computation of six pathway-specific PRS based on GWAS data, focusing on pathways including amyloid beta and endocytosis/transport.
  • Estimation of Aβ chronicity using the Sampled Iterative Local Approximation (SILA) technique.
  • Robust linear regression models to assess interactions between Aβ chronicity and tau-PET uptake, controlling for covariates like APOE-ε4 status.

Main Results:

  • Significant interactions were found between Aβ chronicity and PRS for the amyloid beta and endocytosis/transport pathways (p < 0.03).
  • Higher genetic risk within these pathways amplified the association between longer amyloid exposure and increased tau accumulation in specific Braak regions (III-IV & V-VI).
  • These findings remained significant even after removing outliers (p < 0.02).

Conclusions:

  • Genetic variations in amyloid-beta and endocytosis/transport pathways significantly strengthen the link between prolonged amyloid exposure and heightened tau pathology in AD.
  • The results suggest a direct genetic contribution to amyloid-driven tau accumulation and support the role of synaptic amyloid-tau interactions in AD progression.
  • These findings provide mechanistic insights into the interplay between amyloid and tau pathologies in Alzheimer's disease.