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Genetic variation in memory functioning.

Lars-Göran Nilsson1, Lars Nyberg, Lars Bäckman

  • 1Department of Psychology, Stockholm University, Stockholm SE 10691, Sweden. lgn@psychology.su.se

Neuroscience and Biobehavioral Reviews
|December 10, 2002
PubMed
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Genetic factors influence memory. The ApolipoproteinE (ApoE) epsilon 4 allele is linked to poorer episodic memory performance, especially when cognitive support is needed for encoding and retrieval.

Area of Science:

  • Neurogenetics
  • Cognitive Neuroscience
  • Human Genetics

Background:

  • Individual differences in memory performance are influenced by genetic factors.
  • The ApolipoproteinE (ApoE) gene is a primary focus in memory research.
  • Previous studies show mixed results regarding ApoE's association with memory in non-demented individuals.

Purpose of the Study:

  • To investigate the association between different ApolipoproteinE (ApoE) alleles and episodic memory performance.
  • To examine the influence of genetic factors on memory changes over time.

Main Methods:

  • Utilized data from the prospective Betula cohort study.
  • Assessed episodic memory performance across three ApoE genotypes.
  • Analyzed cross-sectional and longitudinal data, including memory change scores.

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Main Results:

  • Cross-sectional analyses showed no significant differences in episodic memory between ApoE allele carriers.
  • Longitudinal analyses revealed that the ApoE epsilon 4 allele was associated with lower memory performance compared to epsilon 2 and epsilon 3.
  • This effect was more pronounced in memory tasks requiring cognitive support during both encoding and retrieval.

Conclusions:

  • The ApolipoproteinE (ApoE) epsilon 4 allele may negatively impact episodic memory performance.
  • Individuals carrying the epsilon 4 allele might have a deficit in utilizing cognitive support for memory encoding and retrieval.
  • Genetic factors, specifically ApoE genotype, play a role in individual differences in memory performance.