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Basic Science and Pathogenesis.

Kyle M Scott1, Azra Emekci2, 3

  • 1University of Miami Miller School of Medicine, Miami, FL, USA.

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This genome-wide association study identified genetic variants influencing cognitive domains in Alzheimer disease (AD). APOE4 significantly impacted memory, language, and executive function, highlighting genetic contributions to AD endophenotypes.

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Area of Science:

  • Neurogenetics
  • Cognitive Neuroscience
  • Alzheimer Disease Research

Background:

  • Alzheimer disease (AD) is characterized by progressive decline in memory, executive function, and language.
  • Understanding the genetic basis of these cognitive endophenotypes is crucial for elucidating AD's neuropathology.
  • Standardized cognitive measurements are needed to improve reproducibility in AD research.

Purpose of the Study:

  • To conduct a genome-wide association study (GWAS) on memory, executive function, and language domains in Alzheimer disease.
  • To identify specific genetic variants contributing to distinct AD endophenotypes.
  • To gain deeper insights into the neuropathological processes underlying cognitive deficits in AD.

Main Methods:

  • Utilized harmonized cognitive data from the Phenotype Harmonization Consortium (PHC) and genetic data from the National Alzheimer's Coordinating Center (NACC).
  • Performed genome-wide association analysis on 7,279 non-Hispanic White participants using generalized linear mixed models.
  • Controlled for age, sex, education, and three principal components in the association analysis.

Main Results:

  • Identified 27 loci with nominal significance (p < 0.05) across cognitive domains, with 7 loci, including APOE4, APOE2, ABCA7, USP6NL, WNT3, CD2AP, and EPDR1, significant in all three domains.
  • APOE4 demonstrated the most substantial effects, particularly on memory (BETA = -0.28, p = 1.10×10^-58), with significant impacts on language and executive function as well.
  • Results indicate both broad genetic influence across cognitive measures and domain-specific variations in effect magnitude.

Conclusions:

  • Findings enhance understanding of biological mechanisms driving domain-specific cognitive decline in AD.
  • Distinct genetic processes contribute to memory, language, and executive function deficits.
  • These insights support the development of precise, syndrome-focused interventions for a precision medicine approach to AD.