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Updated: Sep 2, 2025

Generalized Psychophysiological Interaction PPI Analysis of Memory Related Connectivity in Individuals at Genetic Risk for Alzheimer's Disease
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Apolipoprotein E Genotype e2: Neuroprotection and Its Limits.

Hyun Kim1,2, Davangere P Devanand1,2,3, Scott Carlson2

  • 1Department of Psychiatry, Columbia University Irving Medical Center, New York, NY, United States.

Frontiers in Aging Neuroscience
|August 1, 2022
PubMed
Summary
This summary is machine-generated.

The APOE-e2 variant shows protective effects for longevity and Alzheimer's disease (AD) neuropathology. However, its impact on cognition and brain imaging is inconsistent, with potential risks for other proteinopathies.

Keywords:
APOE e2Alzheimer’s diseasebiomarkerscognitionneuropathologyneuroprotection

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Area of Science:

  • Neurogenetics
  • Alzheimer's Disease Research
  • Human Longevity Studies

Background:

  • The apolipoprotein E (APOE) gene has multiple alleles, including APOE-e2, APOE-e3, and APOE-e4.
  • APOE-e2 is recognized as a protective variant, particularly concerning Alzheimer's disease (AD).
  • Understanding the precise protective mechanisms and limitations of APOE-e2 is crucial for developing AD prevention and treatment strategies.

Purpose of the Study:

  • To comprehensively review and synthesize existing human data on the APOE-e2 variant.
  • To critically evaluate the associations of APOE-e2 with longevity, cognition, neuroimaging, and neuropathology.
  • To identify research gaps and methodological limitations in current APOE-e2 studies.

Main Methods:

  • Systematic literature review of studies published between 1994 and 2021.
  • Inclusion of studies focusing on human subjects with specified APOE-e2 observation.
  • Comparative analysis of APOE-e2 effects against APOE-e3, APOE-e4, and a combined non-e2 group.

Main Results:

  • APOE-e2 demonstrates the most robust protective association with longevity and AD neuropathologies.
  • Effects of APOE-e2 on cognitive function and AD-related neuroimaging markers (brain structure, function, metabolism) were inconsistent and inconclusive.
  • APOE-e2 was associated with an increased risk of non-AD proteinopathies and a less favorable cerebrovascular profile.

Conclusions:

  • The protective role of APOE-e2 is most evident in longevity and AD neuropathology, but its cognitive and neuroimaging effects remain uncertain.
  • Methodological limitations in existing research may contribute to inconsistent findings regarding APOE-e2's impact on brain function and cognition.
  • Further research is needed to elucidate the independent and unbiased effects of APOE-e2 on AD risk, addressing current methodological shortcomings.