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Related Concept Videos

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Related Experiment Video

Updated: Jun 5, 2025

Generalized Psychophysiological Interaction PPI Analysis of Memory Related Connectivity in Individuals at Genetic Risk for Alzheimer's Disease
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Connectivity, Pathology, and ApoE4 Interactions Predict Longitudinal Tau Spatial Progression and Memory.

Jacob Ziontz1, Theresa M Harrison1, Corrina Fonseca1

  • 1Department of Neuroscience, UC Berkeley, Berkeley, California, USA.

Human Brain Mapping
|December 9, 2024
PubMed
Summary

The spread of tau pathology to the neocortex in Alzheimer's disease (AD) is influenced by brain connectivity, baseline tau, and genetic risk factors like ApoE4. These factors interact to predict future tau accumulation and memory decline.

Keywords:
Alzheimer'sagingfunctional connectivitylongitudinaltau pathology

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Alzheimer's Disease Research

Background:

  • Tau pathology spreading into the neocortex signifies a shift from healthy aging to Alzheimer's disease (AD).
  • The mechanism of tau spread via brain connectivity is proposed but not fully understood, especially concerning AD pathology burden and genetic factors.
  • Investigating the interplay between connectivity, tau, amyloid-beta (Aβ), and genetic risk is crucial for understanding AD progression.

Purpose of the Study:

  • To investigate how baseline tau PET, Aβ PET, and ApoE4 genotype interact with resting-state functional connectivity (rsFC).
  • To examine the prediction of neocortical tau accumulation rate in precuneus and inferior temporal cortex.
  • To determine if these factors moderate the association between connectivity and the rate of memory decline.

Main Methods:

  • Utilized resting-state functional connectivity (rsFC) and longitudinal positron emission tomography (PET) imaging.
  • Analyzed data from a multicohort sample of cognitively unimpaired older adults.
  • Examined the three-way interaction between rsFC, baseline tau, baseline Aβ or ApoE4 status, and subsequent tau accumulation.

Main Results:

  • A significant three-way interaction was found between connectivity, baseline tau, and baseline Aβ or ApoE4 status, predicting neocortical tau accumulation in key brain regions.
  • Baseline tau, Aβ, and ApoE4 status also moderated the relationship between connectivity and the rate of memory decline.
  • These findings highlight the complex interplay of factors influencing AD neuropathology.

Conclusions:

  • The extent and distribution of future tau accumulation in Alzheimer's disease can be predicted by the interaction of baseline brain connectivity, AD pathology burden, and genetic risk.
  • Understanding these interactions offers insights into individual differences in AD progression.
  • This research underscores the importance of considering multiple biological factors in predicting cognitive decline and neuropathology in aging brains.