Cited by 431Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchGenetic Associations and Epidemiology

Variants in the ATP-Binding Cassette Transporter (ABCA7), Apolipoprotein E ϵ4, and the Risk of Late-Onset Alzheimer Disease in African Americans

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Reitz, Christiane, Jun, Gyungah, Naj, Adam, Rajbhandary, Ruchita, Vardarajan, Badri Narayan, Wang, Li-San, Valladares, Otto, Lin, Chiao-Feng +35 more·2013·JAMA

Abstract

IMPORTANCE: Genetic variants associated with susceptibility to late-onset Alzheimer disease are known for individuals of European ancestry, but whether the same or different variants account for the genetic risk of Alzheimer disease in African American individuals is unknown. Identification of disease-associated variants helps identify targets for genetic testing, prevention, and treatment. OBJECTIVE: To identify genetic loci associated with late-onset Alzheimer disease in African Americans. DESIGN, SETTING, AND PARTICIPANTS: The Alzheimer Disease Genetics Consortium (ADGC) assembled multiple data sets representing a total of 5896 African Americans (1968 case participants, 3928 control participants) 60 years or older that were collected between 1989 and 2011 at multiple sites. The association of Alzheimer disease with genotyped and imputed single-nucleotide polymorphisms (SNPs) was assessed in case-control and in family-based data sets. Results from individual data sets were combined to perform an inverse variance-weighted meta-analysis, first with genome-wide analyses and subsequently with gene-based tests for previously reported loci. MAIN OUTCOMES AND MEASURES: Presence of Alzheimer disease according to standardized criteria. RESULTS: Genome-wide significance in fully adjusted models (sex, age, APOE genotype, population stratification) was observed for a SNP in ABCA7 (rs115550680, allele = G; frequency, 0.09 cases and 0.06 controls; odds ratio [OR], 1.79 [95% CI, 1.47-2.12]; P = 2.2 × 10(-9)), which is in linkage disequilibrium with SNPs previously associated with Alzheimer disease in Europeans (0.8 < D' < 0.9). The effect size for the SNP in ABCA7 was comparable with that of the APOE ϵ4-determining SNP rs429358 (allele = C; frequency, 0.30 cases and 0.18 controls; OR, 2.31 [95% CI, 2.19-2.42]; P = 5.5 × 10(-47)). Several loci previously associated with Alzheimer disease but not reaching significance in genome-wide analyses were replicated in gene-based analyses accounting for linkage disequilibrium between markers and correcting for number of tests performed per gene (CR1, BIN1, EPHA1, CD33; 0.0005 < empirical P < .001). CONCLUSIONS AND RELEVANCE: In this meta-analysis of data from African American participants, Alzheimer disease was significantly associated with variants in ABCA7 and with other genes that have been associated with Alzheimer disease in individuals of European ancestry. Replication and functional validation of this finding is needed before this information is used in clinical settings.

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Crossref · 10.1001/jama.2013.2973

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  • The ATP-binding cassette transporter (ABCA7) protein doubles the risk of Alzheimer's disease in Blacks with ABCA7 compared with Blacks without ABCA7.

    “Researchers have also found another genetic factor, the ATP-binding cassette transporter (ABCA7) protein, that doubles the risk of Alzheimer's disease in Blacks with ABCA7 compared with Blacks without ABCA7.84”

    From 2023 Alzheimer's disease facts and figures (2023) · cites this paper as [84]

    The Abstract Results report that a specific ABCA7 variant, rs115550680, was associated with higher odds of late-onset Alzheimer disease in African Americans (OR 1.79), roughly the claimed twofold increase. The claim incorrectly frames the comparison as people with versus without the ABCA7 protein; the paper compares carriers of a variant, and reports odds rather than a doubling of risk. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • The influence of the APOE-e4 allele on Alzheimer's risk may be stronger for White Americans than Black Americans.

    “the influence of the APOE-e4 allele on Alzheimer's risk may be stronger for White Americans than Black Americans”

    From 2023 Alzheimer's disease facts and figures (2023) · cites this paper as [84]

    The introduction says reported Alzheimer’s risk associated with APOE ε4 heterozygosity is inconsistent in African Americans compared with whites. The Results report an association in African Americans, but the paper does not establish the claim’s direction—that the effect may be stronger in White Americans. (LLM, conf=0.77)

    Experimental — accuracy not yet measured
  • The ATP-binding cassette transporter (ABCA7) protein doubles the risk of Alzheimer's dementia in Black people with ABCA7 compared with Black people without ABCA7.

    “Researchers have also found that another genetic factor, the ATP‐binding cassette transporter (ABCA7) protein, doubles the risk of Alzheimer's dementia in Black people with ABCA7 compared with Black people without ABCA7.”

    From 2024 Alzheimer's disease facts and figures (2024) · cites this paper as [90]

    The Abstract Results report that an ABCA7 variant, rs115550680, was associated with higher odds of late-onset Alzheimer disease in African Americans (OR 1.79, 95% CI 1.47–2.12). That is approximately a doubling of odds, but the comparison concerns a specific genetic variant—not Black people “with ABCA7” versus those “without ABCA7”—and the study does not establish that the protein itself causes the increase. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • The influence of the APOE-e4 allele on Alzheimer's risk may be stronger for White Americans than Black Americans.

    “While there is some research into how the influence of genetic risk factors on Alzheimer's and other dementias may differ by race — for example, the influence of the APOE‐e4 allele on Alzheimer's risk may be stronger for White Americans than Black Americans”

    From 2024 Alzheimer's disease facts and figures (2024) · cites this paper as [90]

    The introduction to the study says reported Alzheimer’s risk associated with APOE ε4 heterozygosity is inconsistent in African Americans compared with whites. The Results report an APOE ε4 association in African Americans, but the paper does not establish the claim’s direction—that its influence is stronger in White Americans. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Some studies found that having the APOE-e4 allele did not increase Alzheimer's risk among Blacks, while other studies found that it significantly increased risk.

    “For example, some have found that having the e4 allele did not increase risk among Blacks, [80][81][82] while other studies have found that it significantly increased risk.[83][84][85][86]”

    From 2023 Alzheimer's disease facts and figures (2023) · cites this paper as [84]

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Authors
Reitz, C., Jun, G., Naj, A., Rajbhandary, R., Vardarajan, B. N., Wang, L.-S., Valladares, O., Lin, C.-F., Larson, E. B., Graff-Radford, N. R., Evans, D., De Jager, P. L., Crane, P. K., Buxbaum, J. D., Murrell, J. R., Raj, T., Ertekin-Taner, N., Logue, M., Baldwin, C. T., Green, R. C., Barnes, L. L., Cantwell, L. B., Fallin, M. D., Go, R. C. P., Griffith, P., Obisesan, T. O., Manly, J. J., Lunetta, K. L., Kamboh, M. I., Lopez, O. L., Bennett, D. A., Hendrie, H., Hall, K. S., Goate, A. M., Byrd, G. S., Kukull, W. A., Foroud, T. M., Haines, J. L., Farrer, L. A., Pericak-Vance, M. A., Schellenberg, G. D., Mayeux, R., & Alzheimer Disease Genetics Consortium, F. T.
Affiliations
  • Columbia University (US)
  • Boston University (US)
  • University of Miami (US)
  • Group Health Cooperative (US)
  • Rush University (US)
  • University of Washington (US)
  • Indiana University – Purdue University Indianapolis (US)
  • Harvard University (US)
  • Johns Hopkins University (US)
  • University of Alabama at Birmingham (US)
  • Meharry Medical College (US)
  • Howard University (US)
  • University of Pittsburgh (US)
  • Regenstrief Institute (US)
  • Indiana University Bloomington (US)
  • Washington University in St. Louis (US)
  • North Carolina Agricultural and Technical State University (US)
  • Vanderbilt University (US)
Venue
JAMA
Published
2013-04-10
Volume
309
Issue
14
Pages
1483
ISSN
  • 0002-9955 (ISSN-L)
  • 0098-7484
OpenAlex
W2003958717
Cited by
431
References
52
Citations by year
2026: 13 · 2025: 24 · 2024: 38 · 2023: 32 · 2022: 29 · 2021: 33 · 2020: 34 · 2019: 40 · 2018: 26 · 2017: 35 · 2016: 36 · 2015: 35 · 2014: 38 · 2013: 18
FWCI
29.48
Type
journal article
Language
en
Open access
Locations
  • JAMA (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • IUScholarWorks (Indiana University) (submittedVersion)
Funders
  • Alzheimer's Association
  • Amgen
  • Pfizer
  • Eisai
  • H. Lundbeck A/S
  • National Institutes of Health (5r01ag027944-05, 7r01ag019757-06, 5r37ag015473-15)
  • Genentech
  • National Institute on Aging (R01AG28786-01A1, AG 005138, RC2AG036650, R01AG017917, P01AG010491, P50 AG016575, P30-AG 10161, AG05 128, P30AG010129, P30AG010133, R01AG019085, P30 AG 08051, R01AG028786, U01‐AG10483, R01AG33193, P50 AG016576, R01AG030146, AG021547, P50‐AG16574, R01 AG30146, AG010491, P50AG019724, R01AG037212, R01‐AG17917, U24 AG026390, P30AG028383, R01 AG15819, P01AG007232, P30AG012300, AG 025688, P50AG016577, U01-AG-06781, P50AG005133, R01-AG027944, P30AG028377, U01AG006781, U01AG016976, P50AG005131, R01-AG019757, R01AG22018, K23AG034550, R37-AG015473, P50AG005138, R01AG026390, P50AG016570, R01AG011101, R01AG040770, P50AG005128, P30AG010124, P50AG016573, AG019757, R01AG021547, R01AG030653, U01AG010483, R01AG015819, P30AG008017, P30AG010161, U01AG032984, R01AG015473, P 50 AG05681, R01AG031581, P30AG008051, R01AG041797, P50AG016582, P50AG008702, AG032984, 5R01AG20688, P50AG005681, P50AG005142, R01AG036040, R01AG032990, P50AG008671, P30AG019610, R01AG026916, P50AG005146, P01 AG0 3991, P01AG003991, U24AG026395, P30AG013846, P50AG005136, P50AG005134, P30AG013854, U19AG010483, R01AG025259, P50AG025688, R01AG009029, R01AG1101, R01AG017173, RC2AG036528, R01AG033193, P01AG002219, P30 AG-10133, U24AG056270, P01AG019724, R01AG022018, P01AG026276, U24AG021886, P30AG062421, P50AG023501, AG027944, R01AG020688, AG 030653, P30-AG13846), P50AG016574, R01AG009956)
  • National Institute of Mental Health (MH60451, R01MH080295, P50MH060451)
  • National Human Genome Research Institute (U01HG004610, U01HG006375)
  • National Cancer Institute (R01CA129769, U54CA137788, U54CA132378)
  • National Institute of Neurological Disorders and Stroke (NS3 9764, R01NS036768, P50NS039764)
  • National Center for Research Resources (MO1 RR000-96, UL1RR02777, KL2RR024151, UL1RR029893, M01RR000096)
  • National Institute on Minority Health and Health Disparities (P20MD000546)
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
late-onset Alzheimer's disease, African Americans, ABCA7, APOE ε4, genetic susceptibility, single nucleotide polymorphisms, linkage disequilibrium, rs429358, complement receptor 1, BIN1, EphA1, genetic association, gene-based association tests
MeSH terms
Aged, Alzheimer Disease, Black or African American, Genotype, Humans, Middle Aged, Risk, Genetic Variation, Linkage Disequilibrium, Case-Control Studies, Age of Onset, ATP-Binding Cassette Transporters, Genetic Predisposition to Disease, Polymorphism, Single Nucleotide, Apolipoprotein E4, Genome-Wide Association Study

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