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Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
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APOE polymorphism affects episodic memory among non demented elderly subjects.

Simona De Blasi1, Alberto Montesanto, Cinzia Martino

  • 1Department of Cell Biology, University of Calabria, Rende, Italy.

Experimental Gerontology
|December 9, 2008
PubMed
Summary

The APOE epsilon4 allele specifically impairs episodic memory in healthy older adults, not global cognition. This finding highlights the importance of examining precise cognitive functions in genetic studies of aging.

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Area of Science:

  • Neuroscience
  • Genetics
  • Gerontology

Background:

  • The apolipoprotein E (APOE) epsilon4 allele is linked to neurodegenerative diseases like Alzheimer's.
  • Previous research on APOE epsilon4 and cognitive decline in normal aging has yielded inconsistent results.
  • Phenotypic heterogeneity may contribute to these discrepancies.

Purpose of the Study:

  • To investigate the association between the APOE epsilon4 allele and specific cognitive functions in healthy elderly individuals.
  • To clarify the relationship between APOE genotype and cognitive decline in aging.

Main Methods:

  • A cohort of 620 healthy elderly subjects from Calabria, southern Italy, was genotyped for APOE.
  • Cognitive function was assessed using the Mini-Mental State Examination (MMSE) and other specific tests.
  • Statistical analyses were performed to correlate APOE genotype with cognitive performance.

Main Results:

  • No association was found between APOE polymorphism and overall cognitive function (MMSE scores).
  • Poorer performance in episodic memory, including both registration and recall, was significantly associated with the APOE epsilon4 allele (p=0.01).
  • Temporal and spatial orientation, attention, calculation, language, and constructive functions remained unaffected by APOE genotype.

Conclusions:

  • The APOE epsilon4 allele specifically impacts episodic memory function in healthy aging.
  • Future genetic association studies should evaluate precise cognitive phenotypes to avoid inconsistencies due to heterogeneity.
  • Targeted assessment of episodic memory is crucial when studying the genetic influences on cognitive aging.