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Apolipoprotein E and cognitive performance: a meta-analysis.

Brent J Small1, Christopher B Rosnick, Laura Fratiglioni

  • 1School of Aging Studies, University of South Florida, Tampa, FL 33620, USA. bsmall@cas.usf.edu

Psychology and Aging
|December 9, 2004
PubMed
Summary
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The apolipoprotein E (APOE) epsilon4 allele impacts cognitive function in healthy aging. Non-carriers showed better global, episodic memory, and executive function, with effects being small and domain-specific.

Area of Science:

  • Neuroscience
  • Genetics
  • Cognitive Psychology

Background:

  • The apolipoprotein E (APOE) epsilon4 allele is a significant genetic risk factor for Alzheimer's disease.
  • Its influence on cognitive performance during normal aging is less understood but warrants investigation.

Purpose of the Study:

  • To systematically evaluate the presence and magnitude of cognitive deficits associated with the APOE epsilon4 allele in healthy aging.
  • To determine which cognitive domains are most affected by APOE epsilon4 carriage.

Main Methods:

  • A comprehensive meta-analysis was conducted on 38 studies examining APOE genotype and cognitive performance.
  • Cognitive data were categorized into 8 distinct functional domains.

Main Results:

Related Experiment Videos

  • Significant differences in global cognitive functioning, episodic memory, and executive functioning were observed, favoring individuals without the APOE epsilon4 allele.
  • The magnitude of APOE epsilon4-related cognitive impairment was smaller in individuals with older age and APOE epsilon4 heterozygosity.

Conclusions:

  • The APOE epsilon4 genotype exerts a measurable, albeit small, influence on cognitive performance in healthy aging.
  • This effect is domain-specific, primarily impacting global cognition, episodic memory, and executive functions.