Cited by 177Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

The DOI matches its Crossref record; 94 of the 96 references it cites were found in a registry or an index.

APOE ε2 is associated with milder clinical and pathological Alzheimer disease

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Abstract

Objective: The Alzheimer disease (AD) APOE ε4 risk allele associates with an earlier age at onset and increased amyloid‐β deposition, whereas the protective APOE ε2 allele delays the onset and appears to prevent amyloid‐β deposition. Yet the clinical and pathological effects of APOE ε2 remain uncertain because of its relative rarity. We investigated the effects of APOE ε2 and ε4 alleles on AD pathology and cognition in a large US data set of well‐characterized AD patients. Methods: We studied individuals from the National Alzheimer's Coordinating Center autopsy cohort across the entire clinicopathological continuum of AD. Multivariate models were built to examine the associations between APOE alleles and AD neuropathological changes, using the APOE ε3/ε3 group as comparator. Mediation analysis was used to estimate the direct and indirect effects of APOE alleles on AD pathology and cognition (Clinical Dementia Rating Sum of Boxes and Mini‐Mental State Examination). Results: Compared to APOE ε3/ε3, APOE ε2 is independently associated with lower Braak neurofibrillary tangle (NFT) stages and possibly fewer neuritic plaques, but has no direct effect on cerebral amyloid angiopathy (CAA) severity, whereas APOE ε4 is associated with more neuritic plaques and CAA, but has no independent effect on Braak NFT stage. Unadjusted analyses showed marked differences among APOE genotypes with respect to cognitive performance (ε2 > ε3 > ε4). Mediation analysis suggests that this is largely explained through effects on pathology. Interpretation: Even when adjusted for age at onset, symptom duration, and other demographic variables, APOE ε2 is associated with milder AD pathology and less severe antemortem cognitive impairment compared to APOE ε3 and ε4 alleles, suggesting a relative neuroprotective effect of APOE ε2 in AD. Ann Neurol 2015;77:917–929

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Metadata

Authors
Serrano‐Pozo, A., Qian, J., Monsell, S. E., Betensky, R. A., & Hyman, B. T.
Affiliations
  • University of Iowa Hospitals and Clinics (US)
  • University of Massachusetts Amherst (US)
  • University of Washington (US)
  • Harvard University (US)
  • Massachusetts General Hospital (US)
Corresponding author
Hyman, Bradley T.
Venue
Annals of Neurology
Publisher
Wiley
Published
2015-05-27
Volume
77
Issue
6
Pages
917-929
ISSN
  • 0364-5134 (ISSN-L)
  • 1531-8249
OpenAlex
W1958554455
Cited by
176
References
96
Citations by year
2026: 13 · 2025: 24 · 2024: 17 · 2023: 20 · 2022: 20 · 2021: 22 · 2020: 11 · 2019: 7 · 2018: 8 · 2017: 9 · 2016: 16 · 2015: 9
FWCI
10.32
Type
journal article
Language
en
Open access
Locations
  • Annals of Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (P50 AG005134)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Alzheimer's disease, APOE ε2, APOE ε4, APOE ε3, risk alleles, neurofibrillary tangles, neuritic plaques, cerebral amyloid angiopathy, amyloid-beta deposition, cognitive impairment, neuropathology, neuroprotection, age of onset
MeSH terms
Aged, Aged, 80 and over, Alleles, Alzheimer Disease, Female, Humans, Male, Severity of Illness Index, Cohort Studies, Apolipoprotein E3, Apolipoprotein E4, Apolipoprotein E2

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