Cited by 207Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchGenetic Associations and Epidemiology

Cerebrospinal fluid APOE levels: an endophenotype for genetic studies for Alzheimer's disease

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Cruchaga, Carlos, Kauwe, John S.K., Nowotny, Petra, Bales, Kelly, Pickering, Eve H., Mayo, Kevin, Bertelsen, Sarah, Hinrichs, Anthony +4 more·2012·Human Molecular Genetics

Abstract

The apolipoprotein E (APOE) genotype is the major genetic risk factor for Alzheimer's disease (AD). We have access to cerebrospinal fluid (CSF) and plasma APOE protein levels from 641 individuals and genome-wide genotyped data from 570 of these samples. The aim of this study was to test whether CSF or plasma APOE levels could be a useful endophenotype for AD and to identify genetic variants associated with APOE levels. We found that CSF (P = 8.15 × 10(-4)) but not plasma (P = 0.071) APOE protein levels are significantly associated with CSF Aβ(42) levels. We used Mendelian randomization and genetic variants as instrumental variables to confirm that the association of CSF APOE with CSF Aβ(42) levels and clinical dementia rating (CDR) is not because of a reverse causation or confounding effect. In addition the association of CSF APOE with Aβ(42) levels was independent of the APOE ε4 genotype, suggesting that APOE levels in CSF may be a useful endophenotype for AD. We performed a genome-wide association study to identify genetic variants associated with CSF APOE levels: the APOE ε4 genotype was the strongest single-genetic factor associated with CSF APOE protein levels (P = 6.9 × 10(-13)). In aggregate, the Illumina chip single nucleotide polymorphisms explain 72% of the variability in CSF APOE protein levels, whereas the APOE ε4 genotype alone explains 8% of the variability. No other genetic variant reached the genome-wide significance threshold, but nine additional variants exhibited a P-value <10(-6). Pathway mining analysis indicated that these nine additional loci are involved in lipid metabolism (P = 4.49 × 10(-9)).

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Crossref · 10.1093/hmg/dds296

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Authors
Cruchaga, C., Kauwe, J. S. K., Nowotny, P., Bales, K., Pickering, E. H., Mayo, K., Bertelsen, S., Hinrichs, A., Fagan, A. M., Holtzman, D. M., Morris, J. C., & Goate, A. M.
Affiliations
  • Washington University in St. Louis (US)
  • Brigham Young University (US)
  • Pfizer (United States) (US)
Corresponding author
Goate, Alison M.
Venue
Human Molecular Genetics
Published
2012-07-20
Volume
21
Issue
20
Pages
4558-4571
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2147472495
Cited by
207
References
58
Citations by year
2026: 8 · 2025: 7 · 2024: 9 · 2023: 13 · 2022: 22 · 2021: 12 · 2020: 19 · 2019: 15 · 2018: 12 · 2017: 12 · 2016: 26 · 2015: 19 · 2014: 19 · 2013: 13 · 2012: 1
FWCI
11.15
Type
journal article
Language
en
Open access
Locations
  • Human Molecular Genetics (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust (GR082604MA)
  • National Institutes of Health (5u01ag024904-10, 5p30ns069329-02)
  • Canadian Institutes of Health Research
  • National Institute on Aging (U01-AG-024904, P30AG010129, K01AG030514, R01AG035083, U01AG032984, P 50 AG05681, P50AG005681)
  • National Institute of Neurological Disorders and Stroke (P30-NS069329, P30 NS069329-01)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
Keywords
apolipoprotein E, cerebrospinal fluid biomarkers, endophenotypes, Alzheimer's disease, amyloid-beta 42, APOE ε4 genotype, genetic variants, lipid metabolism, Mendelian randomization, Clinical Dementia Rating
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Apolipoproteins E, Female, Genotype, Humans, Male, Middle Aged, Phenotype, Case-Control Studies

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