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Summary
This summary is machine-generated.

Sex and APOE genotype significantly modify the relationship between hippocampal volume and memory performance in aging individuals. These factors are crucial for understanding Alzheimer's disease progression and cognitive decline.

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Area of Science:

  • Neuroscience
  • Genetics
  • Gerontology

Background:

  • The hippocampus is critical for memory and is affected early in Alzheimer's disease (AD).
  • APOE-ε4 and APOE-ε2 alleles influence AD risk and cognitive decline.
  • Understanding how genetic and demographic factors modify brain-memory relationships is vital for AD research.

Purpose of the Study:

  • To investigate the modifying effects of APOE genotype on the association between hippocampal volume and memory.
  • To examine the influence of sex, race, and clinical diagnosis on this association.

Main Methods:

  • Utilized data from 6,895 participants across four aging and AD cohorts.
  • Employed deep learning for MRI hippocampal volume analysis and latent variable modeling for memory score harmonization.
  • Applied linear and mixed effects regression models to assess interactions on baseline memory and longitudinal trajectories.

Main Results:

  • Hippocampal volume's association with memory is stronger in females than males.
  • APOE-ε4 carriers showed a stronger association, while APOE-ε2 carriers showed an attenuated association, particularly in mild cognitive impairment.
  • Significant three-way interaction between APOE-ε2, AD diagnosis, and hippocampal volume on memory, especially in AD patients.

Conclusions:

  • Sex and APOE genotype significantly modify the hippocampal volume-memory performance link.
  • The most pronounced effects were observed in APOE-ε4 carriers, women, and individuals with AD.
  • Highlights the necessity of integrating genetic, clinical, and demographic factors in AD research and clinical practice.