Effects of Age, Sex, and Ethnicity on the Association Between Apolipoprotein E Genotype and Alzheimer Disease: A Meta-analysis
Abstract
Objective. —To examine more closely the association between apolipoprotein E (APOE) genotype and Alzheimer disease (AD) by age and sex in populations of various ethnic and racial denominations. Data Sources. —Forty research teams contributed data onAPOEgenotype, sex, age at disease onset, and ethnic background for 5930 patients who met criteria for probable or definite AD and 8607 controls without dementia who were recruited from clinical, community, and brain bank sources. Main Outcome Measures. —Odds ratios (ORs) and 95% confidence intervals (Cls) for AD, adjusted for age and study and stratified by major ethnic group (Caucasian, African American, Hispanic, and Japanese) and source, were computed forAPOEgenotypes ∈2/∈2,∈2/∈3,∈2/∈4,∈3/∈4 and ∈4/∈4 relative to the ∈3/∈3 group. The influence of age and sex on the OR for each genotype was assessed using logistic regression procedures. Results. —Among Caucasian subjects from clinic- or autopsy-based studies, the risk of AD was significantly increased for people with genotypes ∈2/∈4 (OR=2.6, 95% Cl=1.6-4.0), ∈3/∈4 (OR=3.2, 95% Cl=2.8-3.8), and ∈4/∈4 (OR=14.9, 95% CI=10.8-20.6); whereas, the ORs were decreased for people with genotypes ∈2/∈2 (OR=0.6, 95% Cl=0.2-2.0) and ∈2/∈3 (OR=0.6, 95% Cl=0.5-0.8). TheAPOE∈4-AD association was weaker among African Americans and Hispanics, but there was significant heterogeneity in ORs among studies of African Americans (P<.03). TheAPOE∈4—AD association in Japanese subjects was stronger than in Caucasian subjects (∈3/∈4: OR=5.6, 95% Cl=3.9-8.0; ∈4/∈4: OR=33.1, 95% Cl=13.6-80.5). The ∈2/∈3 genotype appears equally protective across ethnic groups. We also found that among Caucasians,APOEgenotype distributions are similar in groups of patients with AD whose diagnoses were determined clinically or by autopsy. In addition, we found that theAPOE∈4 effect is evident at all ages between 40 and 90 years but diminishes after age 70 years and that the risk of AD associated with a given genotype varies with sex. Conclusions. —TheAPOE∈4 allele represents a major risk factor for AD in all ethnic groups studied, across all ages between 40 and 90 years, and in both men and women. The association betweenAPOE∈4 and AD in African Americans requires clarification, and the attenuated effect ofAPOE∈4 in Hispanics should be investigated further.
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The greatest risk factors for late-onset Alzheimer's are older age, genetics (especially the e4 form of the APOE gene), and having a family history of Alzheimer's.
“The greatest risk factors for late-onset Alzheimer's are older age, 62,63 genetics 64,65 -especially the e4 form of the apolipoprotein E (APOE) gene -and having a family history of Alzheimer's.[66][67][68][69]”
From 2023 Alzheimer's disease facts and figures (2023) · cites this paper as [65]
APOE4 homozygotes are at the highest risk of Alzheimer's dementia.
“such that APOE4 homozygotes are at the highest risk”
From Exceptionally low likelihood of Alzheimer’s dementia in APOE2 homozygotes from a 5,000-person neuropathological study (2020) · cites this paper as [4]
Previous studies of clinically and neuropathologically characterized cases and controls may have been too small to demonstrate that APOE2 homozygotes have an even lower odds ratio than the relatively low-risk APOE2/3 group due to the paucity of APOE2 homozygotes, who comprise <1% of the general population.
“Also, previous studies of clinically and neuropathologically characterized cases and controls may have been too small to demonstrate that APOE2 homozygotes have an even lower OR than the relatively low-risk APOE2/3 group due to the paucity of APOE2 homozygotes, who comprise <1% of the general population1,4.”
From Exceptionally low likelihood of Alzheimer’s dementia in APOE2 homozygotes from a 5,000-person neuropathological study (2020) · cites this paper as [4]
Compared to the APOE3/3 genotype, each additional copy of the APOE4 allele is associated with a higher risk of Alzheimer's dementia and a younger mean age at dementia onset.
“Compared to the most common APOE3/3 genotype, each additional copy of the APOE4 allele is associated with a higher risk of Alzheimer’s dementia and a younger mean age at dementia onset, such that APOE4 homozygotes are at the highest risk”
From Exceptionally low likelihood of Alzheimer’s dementia in APOE2 homozygotes from a 5,000-person neuropathological study (2020) · cites this paper as [4]
APOE is the major susceptibility gene for late-onset Alzheimer's disease.
“Apolipoprotein E (APOE), the major susceptibility gene for late-onset Alzheimer’s disease (AD), has three common alleles (APOE2, 3, and 4), giving rise to six genotypes (APOE2/2, 2/3, 3/3, 2/4, 3/4, and 4/4).”
From Exceptionally low likelihood of Alzheimer’s dementia in APOE2 homozygotes from a 5,000-person neuropathological study (2020) · cites this paper as [4]
The presence of one or two copies of the APOE2 allele is associated with a lower risk of Alzheimer's dementia and an older mean age at dementia onset.
“while the presence of one or two copies of the APOE2 allele is associated with a lower risk of Alzheimer’s dementia and an older mean age at dementia onset1–4.”
From Exceptionally low likelihood of Alzheimer’s dementia in APOE2 homozygotes from a 5,000-person neuropathological study (2020) · cites this paper as [4]
Findings from the non-Hispanic White groups cannot yet be extended to other ethnic and racial groups.
“Fourth, findings from our non-Hispanic White groups cannot yet be extended to other ethnic and racial groups4.”
From Exceptionally low likelihood of Alzheimer’s dementia in APOE2 homozygotes from a 5,000-person neuropathological study (2020) · cites this paper as [4]
APOE is genetically linked to late-onset sporadic Alzheimer's disease (LOAD), with APOE4 being a significant risk factor, APOE3 considered the "neutral" allele, and APOE2 exerting a protective role against LOAD.
“APOE is genetically linked to late-onset sporadic Alzheimer’s disease (LOAD), with APOE4 being a significant risk factor, APOE3 considered the “neutral” allele, and APOE2 exerting a protective role against LOAD [6, 7].”
APOE4 is linked to hypercholesterolemia and increased risk of cardiovascular disorders (CVD).
“In addition, APOE4 is linked to hypercholesterolemia and increased risk of cardiovascular disorders (CVD) [7, 41]”
Compared to ε3 homozygotes, individuals with one or two ε4 alleles have approximately 3 and 15 times increased risk of sporadic AD, respectively.
“Compared to ε3 homozygotes, individuals with one or two ε4 alleles harbor approximately 3 and 15 times increased risk, respectively”
From Effects of APOE2 and APOE4 on brain microstructure in older adults: modification by age, sex, and cognitive status (2024) · cites this paper as [1]
Carriers of the ε2 allele have an estimated 1.7 times decreased risk of AD.
“whereas carriers of the protective ε2 allele have an estimated 1.7 times decreased risk [1]”
From Effects of APOE2 and APOE4 on brain microstructure in older adults: modification by age, sex, and cognitive status (2024) · cites this paper as [1]
Between 45% and 50% of Alzheimer's disease patients carry at least one APOE4 allele compared to only 15% of age-matched healthy controls.
“Between 45% and 50% of AD patients carry at least one APOE4 allele compared to only 15% of age-matched healthy controls.5,11”
From AAVrh.10-Mediated APOE2 Central Nervous System Gene Therapy for APOE4-Associated Alzheimer's Disease (2018) · cites this paper as [11]
APOE4 is the strongest genetic determinant of late-onset AD, increasing risk in a gene dose-dependent manner, whereas APOE2 confers substantial protection.
“APOE4 is the strongest genetic determinant of late-onset AD, increasing risk in a gene dose-dependent manner, whereas APOE2 confers substantial protection 1 -5 .”
From APOE2 attenuates APOE4-associated amyloid pathology and related toxicity in a mouse model of Alzheimer’s disease (2026) · cites this paper as [5]
In humans, the APOE2/4 genotype confers an intermediate risk, higher than that of APOE3/3 but lower than APOE3/4 and APOE4/4.
“In humans, the APOE2/4 genotype confers an intermediate risk, higher than that of APOE3/3 but lower than APOE3/4 and APOE4/4 5,6 .”
From APOE2 attenuates APOE4-associated amyloid pathology and related toxicity in a mouse model of Alzheimer’s disease (2026) · cites this paper as [5]
The ε4 allele increases the risk of developing Alzheimer's disease by 3-fold with one allele or 12-fold with two alleles.
“Population studies have demonstrated that the ε4 allele increases the risk of developing AD by either 3-fold (1 allele) or 12-fold (2 alleles) [6]”
From In Vivo Human Apolipoprotein E Isoform Fractional Turnover Rates in the CNS (2012) · cites this paper as [6]
ApoE4, found in 65-80% of cases of sporadic and familial Alzheimer's disease, increases the occurrence of AD by ∼12 fold in two ɛ4 allele carriers, compared with those with no ɛ4 allele.
“ApoE4, found in 65–80% of cases of sporadic and familial Alzheimer's disease, increases the occurrence of AD by ∼12 fold in two ɛ4 allele carriers, compared with those with no ɛ4 allele (Farrer et al., 1997).”
From Apolipoprotein E in Synaptic Plasticity and Alzheimer’s Disease: Potential Cellular and Molecular Mechanisms (2014) · cites this paper as Farrer et al., 1997
APOE4 was previously shown to accelerate AD progression in humans and in mouse models.
“The APOE4 allele is a major genetic risk factor for late-onset AD and was previously shown to accelerate AD progression in humans and in mouse models 6-11 .”
From APOE4 impairs the microglial response in Alzheimer’s disease by inducing TGFβ-mediated checkpoints (2023) · cites this paper as [6]
The APOE4 allele is a major genetic risk factor for late-onset Alzheimer's disease.
“The APOE4 allele is the strongest genetic risk factor for late-onset Alzheimer's disease (AD).”
From APOE4 impairs the microglial response in Alzheimer’s disease by inducing TGFβ-mediated checkpoints (2023) · cites this paper as [6]
Epidemiologic studies show sex differences in clinical risk are largely discernable within the context of APOE ε4, particularly between the ages of 65 to 75 years compared with APOE ε4 clinically normal male carriers.
“Epidemiologic studies show sex differences in clinical risk are largely discernable within the context of APOE ε4,11,42,43 particularly between the ages of 65 to 75 years compared with APOE ε4 clinically normal male carriers.44”
From Sex Differences in the Association of Global Amyloid and Regional Tau Deposition Measured by Positron Emission Tomography in Clinically Normal Older Adults (2019) · cites this paper as [43]
Clinical studies have reported that women APOE ε4 carriers had a higher risk of Alzheimer's dementia than men carriers.
“Separately, clinical studies have reported that women APOE ε4 carriers had a higher risk of Alzheimer’s dementia than men carriers [21].”
From Sex differences in Alzheimer’s disease and common neuropathologies of aging (2018) · cites this paper as [21]
A recent meta-analysis of 58,000 participants showed that APOE ε3/ε4 women have the same increased odds of AD dementia as APOE ε3/ε4 men, whereas a previous meta-analysis reported APOE ε4 women to carry a higher risk of Alzheimer's dementia compared to APOE ε4 men.
“Furthermore, a recent meta-analysis of 58000 participants showed that APOE ε3/ε4 women have the same increased odds of AD dementia as APOE ε3ε4 men have, in contrast to a previous meta-analysis which reported APOE ε4 women to carry a higher risk of Alzheimer’s dementia compared to APOE ε4 men [21].”
From Sex differences in Alzheimer’s disease and common neuropathologies of aging (2018) · cites this paper as [21]
APOE4 carriers make up 55-75% of AD cases.
“As APOE4 carriers make up 55–75% of AD cases17–20”
From The APOE-R136S mutation protects against APOE4-driven tau pathology, neurodegeneration, and neuroinflammation (2023) · cites this paper as [18]
The APOEε4 allele increases Alzheimer disease risk differentially across races and ethnicities, with the greatest increase in risk seen in East Asian people, followed by white, then Black, then Hispanic people.
“The initial intriguing observation that the APOEε4 allele increases AD risk differentially across races and ethnicities, with the greatest increase in risk seen in East Asian people, followed by white, then Black, then Hispanic people6, has now been confirmed by a larger meta-analysis using not only self-reported race and ethnicity but also global genetic ancestry to ascertain the biological basis”
From Multifaceted roles of APOE in Alzheimer disease (2024) · cites this paper as [6]
The risk associated with the APOEε3/ε4 genotype is highest in women of ages 60-70 years (or 70-80 years according to ref. 6) but decreases in older women and equalizes to that of non-Hispanic White, Black and Hispanic men of the same age.
“Rather, age and sex moderate the effects of the APOE genotype on AD risk so that the risk associated with the APOEε3/ε4 genotype is highest in women of ages 60–70 years (or 70–80 years according to ref. 6) but decreases in older women and equalizes to that of non-Hispanic White, Black and Hispanic men of the same age10.”
From Multifaceted roles of APOE in Alzheimer disease (2024) · cites this paper as [6]
The APOE polymorphism is the most studied, successfully replicated, and well-established risk factor for Alzheimer's disease, with APOE*2 protective and APOE*4 risk compared to APOE*3.
“The APOE polymorphism is the most studied, successfully replicated, and well-established risk factor for AD where APOE*2 is the protective allele and APOE*4 is the risk allele as compared to APOE*3 [7–10].”
From Genome-wide analysis identifies novel loci influencing plasma apolipoprotein E concentration and Alzheimer’s disease risk (2023) · cites this paper as [8]
Prior association studies of L28P with late-onset Alzheimer's disease used relatively limited samples.
“The original association study implicating L28P with LOAD risk was carried out in a relatively small sample size.”
From Investigation of the independent role of a rare APOE variant (L28P; APOE*4Pittsburgh) in late-onset Alzheimer disease (2023) · cites this paper as [9]
The rare APOE variant L28P is in complete linkage disequilibrium with the APOE*4 allele.
“due to the complete linkage disequilibrium of L28P with APOE*4 (C112R)”
From Investigation of the independent role of a rare APOE variant (L28P; APOE*4Pittsburgh) in late-onset Alzheimer disease (2023) · cites this paper as [9]
The L28P variant has been associated with an elevated risk for Alzheimer's disease.
“it was associated with an elevated risk for AD [9]”
From Investigation of the independent role of a rare APOE variant (L28P; APOE*4Pittsburgh) in late-onset Alzheimer disease (2023) · cites this paper as [9]
In 1999, two groups independently identified a novel and rare missense mutation in the APOE gene (L28P; rs769452) in which leucine is replaced by proline at codon 28.
“In 1999, two groups independently identified a novel and rare missense mutation in the APOE gene [9, 10] in which the leucine residue is replaced by proline at codon 28 (L28P; rs769452).”
From Investigation of the independent role of a rare APOE variant (L28P; APOE*4Pittsburgh) in late-onset Alzheimer disease (2023) · cites this paper as [9]
The East Asian population has a higher risk of Alzheimer's disease associated with the APOE ε4 allele.
“with the East Asian population having a higher risk of AD associated with the APOE ε4 allele”
From Genetics of Alzheimer’s disease: An East Asian perspective (2023) · cites this paper as [11]
The effect of APOE ε4 on Alzheimer's disease risk is weaker in African American and Hispanic populations.
“while the effect of APOE ε4 is weaker in African American and Hispanic populations”
From Genetics of Alzheimer’s disease: An East Asian perspective (2023) · cites this paper as [11]
The AD risk associated with common APOE alleles ε4 and ε2 is well established in European-ancestry individuals but varies considerably across other ancestries.
“The AD risk associated with common APOE alleles ε4 1 and ε2 2 is well established in European-ancestry individuals but varies considerably across other ancestries (Table 1). 3”
From Association of African Ancestry–Specific <i>APOE</i> Missense Variant R145C With Risk of Alzheimer Disease (2023) · cites this paper as [3]
APOE remains the most significant genetic risk factor for Alzheimer's disease across populations.
“Among the AD susceptibility genes/loci identified to date, APOE remains the most significant genetic risk factor across populations.”
From Association of rare <i>APOE</i> missense variants with Alzheimer's disease in the Japanese population (2025) · cites this paper as [8]
Over 60% of symptomatic AD patients carry at least one APOE ε4 allele, while about 20% of the population carries APOE ε4.
“Although there is only about 20% of the population carrying the APOE ε4, this isoform is vastly enriched in AD patients with over 60% of symptomatic AD patients carrying at least one APOE ε4 allele”
From ApoE4 reduction: An emerging and promising therapeutic strategy for Alzheimer's disease (2022) · cites this paper as Farrer et al 1997
The ε4 allele of apolipoprotein E (APOE) is the major genetic risk factor for late-onset Alzheimer's disease (AD).
“The ε4 allele of apolipoprotein E (APOE) is the dominant genetic risk factor for late-onset Alzheimer’s disease (AD).”
From APOE4 is Associated with Differential Regional Vulnerability to Bioenergetic Deficits in Aged APOE Mice (2020) · cites this paper as [5]
Human apolipoprotein E (ApoE) genetic polymorphism confers differential susceptibility to late-onset Alzheimer's disease, which accounts for the majority of AD cases.
“The genetic polymorphism of human apolipoprotein E (ApoE) has been shown to confer differential susceptibility to late-onset AD, which accounts for the majority of the AD cases (Farrer et al., 1997).”
From Human ApoE Isoforms Differentially Modulate Brain Glucose and Ketone Body Metabolism: Implications for Alzheimer's Disease Risk Reduction and Early Intervention (2018) · cites this paper as Farrer et al., 1997
ApoE4 occurs in approximately two-thirds of all Alzheimer's disease cases.
“occurs in approximately two-thirds of all cases [1–3]”
From Neuronal Apolipoprotein E4 Expression Results in Proteome-Wide Alterations and Compromises Bioenergetic Capacity by Disrupting Mitochondrial Function (2019) · cites this paper as [2]
Apolipoprotein E4 is the major genetic risk factor for Alzheimer's disease.
“Apolipoprotein (apo) E4 is the major genetic risk factor for Alzheimer’s disease (AD)”
From Neuronal Apolipoprotein E4 Expression Results in Proteome-Wide Alterations and Compromises Bioenergetic Capacity by Disrupting Mitochondrial Function (2019) · cites this paper as [2]
APOE3 is risk-neutral for Alzheimer's disease, while APOE2 is the strongest genetic protective factor.
“In contrast, APOE3 is defined as risk-neutral while APOE2 represents the strongest genetic protective factor (Corder et al., 1994; Farrer et al., 1997; Reiman et al., 2020).”
From APOE genotype-dependent differences in human astrocytic energy metabolism (2025) · cites this paper as Farrer et al., 1997
Numerous studies have confirmed that possession of the ε4 allele is the strongest genetic risk factor for both AD and CAA, or a combination of both disorders.
“Since then, numerous studies have confirmed that possession of the ε4 allele is the strongest genetic risk factor for both AD and CAA, or a combination of both disorders (Bertram et al., 2007; Farrer et al., 1997).”
From The role of apolipoprotein E in Alzheimer's disease (2009) · cites this paper as Farrer et al., 1997
In certain ethnic groups, the apoE ε4 allele seems to have either a weaker effect or no clear effect on AD.
“However, in certain ethnic groups, the apoE ε4 allele seems to have either a weaker effect or no clear effect on AD (Farrer et al., 1997; Kalaria et al., 2008; Mayeux, 2003; Tang et al., 1998).”
From The role of apolipoprotein E in Alzheimer's disease (2009) · cites this paper as Farrer et al., 1997
The ε2 allele of apoE is associated with a lower risk for AD.
“Finally, it is important to note that the ε2 allele of apoE is associated with a lower risk for AD (Corder et al., 1994; Farrer et al., 1997).”
From The role of apolipoprotein E in Alzheimer's disease (2009) · cites this paper as Farrer et al., 1997
The global frequency of the human ε4 allele is 13.7%, and the frequency of ε4 carriers is increased to 40% in AD patients.
“The global frequency of the human ε4 allele is 13.7%, and the frequency of ε4 carriers is increased to 40% in AD patients [452, 453].”
From Molecular and cellular mechanisms underlying the pathogenesis of Alzheimer’s disease (2020) · cites this paper as [453]
Clinical incidence and average age of AD onset is 91% at 68 years in ε4 homozygous carriers, 47% at 76 years in ε4 heterozygous carriers, and 20% at 84 years in non-ε4 individuals.
“Clinical incidence and average age of AD onset was found to be 91% at 68 years of age in ε4 homozygous carriers, 47% at 76 years of age in ε4 heterozygous carriers, and 20% at 84 years of age in non-ε4 individuals [453].”
From Molecular and cellular mechanisms underlying the pathogenesis of Alzheimer’s disease (2020) · cites this paper as [453]
ApoE4 is present in roughly 20-25% of the human population, and apoE4 carriers account for 60-75% of Alzheimer's disease cases in most clinical studies.
“ApoE4 is present in roughly 20–25% of the human population, and apoE4 carriers account for 60–75% of AD cases in most clinical studies [11], highlighting the importance of apoE4 in AD pathogenesis.”
From Apolipoprotein E4, inhibitory network dysfunction, and Alzheimer’s disease (2019) · cites this paper as [11]
ApoE4 increases the risk and decreases the age of onset of Alzheimer's disease in a gene dose dependent manner.
“ApoE4 increases the risk and decreases the age of onset of AD in a gene dose dependent manner [4–11].”
From Apolipoprotein E4, inhibitory network dysfunction, and Alzheimer’s disease (2019) · cites this paper as [11]
The effect of APOEε4 on Alzheimer's disease risk differs across ethnicities.
“the effect of APOEε4 has been reported to differ across ethnicities [58–61]”
From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [58]
The association between APOEε4 and Alzheimer's disease is weaker among African-American and Hispanic individuals and nonexistent among Nigerian individuals.
“the association between ε4 and disease is reported to be weaker among African-American and Hispanic individuals [58, 61, 62] and nonexistent among Nigerian individuals [63].”
From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [58]
The APOEε4 isoform exhibits some dominant effect over the APOEε2 isoform.
“APOEε2/APOEε4 individuals are still at increased risk for AD, suggesting the APOEε4 isoform exhibits some dominant effect over the APOEε2 isoform [58].”
From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [58]
APOE genotype has an exacerbated effect on disease risk in females.
“Several studies have demonstrated APOE genotype has an exacerbated effect on disease risk in females [58]”
From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [58]
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BackgroundIdentification of common variants influencing risk of the tauopathy progressive supranuclear palsy
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- Authors
- Farrer, L. A.
- Corresponding author
- Farrer, Lindsay A.
- ORCID
- Farrer, Lindsay A.
- Venue
- JAMA
- Publisher
- American Medical Association (AMA)
- Published
- 1997-10-22
- Volume
- 278
- Issue
- 16
- Pages
- 1349
- ISSN
- 0002-9955 (ISSN-L)
- 0098-7484
- OpenAlex
- W7028228764
- Cited by
- 124
- References
- 0
- Citations by year
- 2026: 16 · 2025: 8 · 2024: 6 · 2023: 12 · 2022: 12 · 2021: 11 · 2020: 12 · 2019: 7 · 2018: 5 · 2017: 7 · 2016: 3 · 2015: 5 · 2014: 4 · 2013: 1 · 2012: 4
- FWCI
- 0.82
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- JAMA (publishedVersion)
- EUR Research Repository (Erasmus University Rotterdam) (submittedVersion)
- Florence Research (University of Florence) (submittedVersion)
- 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, APOE ε4, Alzheimer's disease, genetic risk, age of onset, sex differences, ethnic differences, African Americans, Hispanic population, Japanese population, genetic heterogeneity, dementia risk
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