Cited by 185Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsMedicinal Plants and Neuroprotection

APOE ε2 is associated with intact cognition but increased Alzheimer pathology in the oldest old

Open access
Berlau, Daniel J., Corrada, María M., Head, Elizabeth, Kawas, Claudia H.·2009·Neurology

Abstract

BACKGROUND: Many studies have examined the role of APOE genotype in the development of dementia, specifically Alzheimer disease (AD). The APOE epsilon4 allele (APOE4) is a risk factor for both clinical and neuropathologic AD whereas the APOE epsilon2 allele (APOE2) seems to be protective. This would predict, even with advanced age, that APOE2 carriers would be less likely to have dementia and less likely to meet pathologic criteria for AD. METHODS: The first 85 genotyped participants from The 90+ Study to come to autopsy were included. All-cause dementia (using DSM-IV criteria) and AD (using National Institute of Neurological and Communicative Disorders and Stroke-Alzheimer's Disease and Related Disorders Association criteria) diagnoses were made by consensus conference using all available information including neuropsychological testing, neurologic examination, and medical records. Neuropathologic examination included Braak and Braak staging for plaques and tangles and diagnosis of neuropathologic AD using National Institute on Aging-Reagan criteria. RESULTS: Across all genotypes, 58.5% of subjects were diagnosed with clinical dementia (81% of dementia was AD) and 50.0% met neuropathologic criteria for AD. Compared to those with an APOE epsilon3/epsilon3 genotype (APOE3/3), APOE4 carriers were more likely to be diagnosed with dementia (odds ratio [OR] = 12.2, 95% confidence interval [CI] = 1.5-102.0), whereas APOE2 carriers were not (OR = 0.3, 95% CI = 0.1-1.3). Surprisingly, both APOE4 (OR = 4.6, 95% CI = 1.3-16.5) and APOE2 (OR = 7.8, 95% CI = 1.5-40.2) carriers were more likely to meet neuropathologic criteria for AD than those with APOE3/3 genotype. CONCLUSIONS: In the oldest old, the presence of the APOE epsilon2 allele (APOE2) was associated with a somewhat reduced risk of dementia, but paradoxically was associated with increased Alzheimer disease (AD) neuropathology. Therefore, oldest old APOE2 carriers may have some mechanism that contributes to the maintenance of cognition independently of the formation of AD pathology.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1212/01.wnl.0000343853.00346.a4

Cites

43 of 43 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • APOE2-induced deposition of diffuse plaques is novel in a mouse model and consistent with previous work by Dr. C. Kawas and co-workers.

    “This APOE2induced deposition of diffuse plaques is novel in a mouse model and consistent with the previous work by Dr. C. Kawas and co-workers (54,55) who report that increased diffuse plaques are associated with APOE2 in cognitively normal subjects compared with compact plaques in APOE4 AD patients from the oldest of the old study.”

    From APOE4-specific Changes in Aβ Accumulation in a New Transgenic Mouse Model of Alzheimer Disease (2012) · cites this paper as [54]

    The Results (page unavailable) report a trend toward more diffuse plaques in oldest-old APOE2 carriers versus APOE3/3 carriers, and greater plaque pathology in non-demented APOE2 carriers. They do not establish increased diffuse plaques specifically in cognitively normal APOE2 subjects or the claimed contrast with compact plaques in APOE4 Alzheimer’s patients. The mouse-model novelty is the citing authors’ own finding, not a claim attributed to this source. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • It remains unclear whether apoE2 exerts its protective effect through modulating Aβ aggregation or an alternative mechanism that is independent of amyloid plaque formation.

    “It remains unclear whether apoE2 exerts its protective effect through modulating Aβ aggregation or an alternative mechanism that is independent of amyloid plaque formation (Berlau et al., 2009).”

    From The role of apolipoprotein E in Alzheimer's disease (2009) · cites this paper as Berlau et al., 2009

  • Many with plaques will remain asymptomatic for years or even decades, and perhaps some will never develop symptoms.

    “After all, many with plaques will remain asymptomatic for years or even decades, and perhaps some will never develop symptoms [241].”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Berlau, D. J., Corrada, M. M., Head, E., & Kawas, C. H.
Affiliations
  • University of California, Irvine (US)
  • From the Institute of Brain Aging and Dementia (D.J.B., M.M.C., E.H., C.H.K.) and Departments of Neurology (M.M.C., E.H., C.H.K.) and Neurobiology & Behavior (C.H.K.), University of California, Irvine.
Venue
Neurology
Published
2009-03-03
Volume
72
Issue
9
Pages
829-834
ISSN
  • 0028-3878 (ISSN-L)
  • 1526-632X
OpenAlex
W2092189536
Cited by
185
References
43
Citations by year
2026: 6 · 2025: 6 · 2024: 6 · 2023: 2 · 2022: 8 · 2021: 15 · 2020: 35 · 2019: 10 · 2018: 9 · 2017: 10 · 2016: 9 · 2015: 9 · 2014: 7 · 2013: 10 · 2012: 13
FWCI
8.84
Type
journal article
Language
en
Open access
Locations
  • Neurology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
National Institute on Aging (R01 AG21055, R01AG021055, P50AG016573, T32AG000096)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Complementary and alternative medicine › Medicinal Plants and Neuroprotection
Keywords
APOE ε2, APOE ε4, APOE genotype, Alzheimer's disease, dementia, oldest old, cognitive function, neuropathology, amyloid plaques, neurofibrillary tangles, Braak staging, genetic risk factors
MeSH terms
Age Factors, Aged, Aged, 80 and over, Alzheimer Disease, Brain, Cognition, Female, Humans, Longitudinal Studies, Male, Neurons, Prospective Studies, Apolipoprotein E2

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review