Mutations
APOE C130R (ApoE4)
Mature Protein Numbering: C112R
Other Names: ApoE4
Quick Links
Overview
Clinical
Phenotype: Alzheimer's Disease, Multiple Conditions
Position: (GRCh38/hg38):Chr19:44908684 T>C
Position: (GRCh37/hg19):Chr19:45411941 T>C
Transcript: NM_000041; ENSG00000130203
dbSNP ID: rs429358
Coding/Non-Coding: Coding
DNA
Change: Allele
Expected RNA
Consequence: Allele
Expected Protein
Consequence: Allele
Codon
Change: TGC to CGC
Reference
Isoform: APOE Isoform 1
Genomic
Region: Exon 4
Research
Models: 3
Findings
This variant, one of the three common alleles of the APOE gene, is the major known risk factor for late-onset Alzheimer’s disease (LOAD), with a high degree of penetrance in homozygous form. It is found in at least half and as much as 75 percent of all LOAD patients. Unlike other variants associated with a high risk of disease, APOE4 is common, with a global frequency of 14 to 25 percent. The risk it confers appears to vary between populations, with people of East Asian ancestry being more vulnerable, those of European ancestry less, and those of African or Hispanic ancestry even less (see table below). The largest datasets are from studies of Caucasian populations, in which APOE4 increases AD risk in a dose-dependent manner with one allele raising risk about threefold, and two alleles elevating it 10- to 15-fold (for reviews, see Belloy et al., 2019; Yamazaki et al., 2019; Serrano-Pozo et al., 2021; Koutsodendris et al., 2021; Martens et al., 2022).
APOE4 was originally studied in the context of blood lipids and cardiovascular disease and first characterized at the protein level as one of three inherited ApoE isoforms with unique cysteine/arginine combinations at two positions eventually identified as 130 and 176 (Weisgraber et al., 1981; Zannis and Breslow, 1981). With arginines at both positions, ApoE4 is the most basic of the three species and was designated 4 based on its migration upon isoelectric focusing (see Nomenclature Notes below). It is likely that APOE4 is the ancestral form of APOE which gave rise to APOE2 and APOE3 (Hanlon and Rubinsztein 1995; Seixas et al., 1999; Fullerton et al., 2000; Abondio et al., 2019).
APOE4’s ties to LOAD date back to the early 1990s, when a linkage study of multiple affected families revealed a disease-associated locus on chromosome 19, which then led to pinpointing of the APOE4 allele (Corder et al., 1993; Saunders et al., 1993; Strittmatter et al., 1993; Poirier et al., 1993). Since then, several large association studies have confirmed and extended these findings (Coon et al., 2007; Grupe et al., 2007; GWAS catalog). Overall, the population risk that can be attributed to APOE4 has been estimated at 20 percent (Reyes-Dumeyer et al., 2022), following a semi-dominant pattern of inheritance with moderate penetrance (Genin et al., 2011; see also May 2024 news). APOE4 status alone still outperforms polygenic risk scores in predicting dementia risk, despite the steady improvement of the latter, including multiple genome-wide variants (Yu et al., 2023).
In homozygous form, APOE4 has even been proposed to be a genetic cause of AD pathology with near full penetrance (May 2024 news, Fortea et al., 2024). The proposal is based on data from more than 13,000 individuals, most of European ancestry, indicating that nearly all APOE4 homozygotes had abnormal CSF Aβ42, and 75 percent had positive amyloid scans by age 65. By age 80, 88 percent were positive for the two biomarkers, as well as for CSF p-tau181. On average, memory problems had emerged by age 65. However, clinical penetrance was not assessed in this study. Importantly, other studies indicate the risk of homozygotes developing mild cognitive impairment or dementia due to AD is only 30 to 55 percent (Qian et al., 2017).
APOE4 Effects on AD Onset and Progression | APOE4-Related AD and its Modulation | The Role of Other Variants in APOE4 Pathogenicity | APOE4 and Ancestry | Non-AD Neurological Disorders | Non-Neurological Conditions | Biological Effects | Molecular Level Effects | Distinct Cell Type Effects: Glial Cells | Distinct Cell Type Effects: Neurons | Distinct Cell Type Effects: Vascular Cells | Peripheral Effects on Brain Health | Therapeutic Candidates | Research Models | Nomenclature Notes
APOE4 Effects on AD Onset and Progression
APOE4 modifies the age of AD onset, with carriers’ symptoms emerging about five years earlier than those of non-carriers (Sando et al., 2008; De Rojas et al., 2021). Consistent with the earlier onset of symptoms, amyloid and tau pathologies were shifted towards younger ages, six and two years, respectively, in a longitudinal PET study (Therneau et al., 2021). Moreover, APOE4 carriers in the early stages of AD had higher levels of Aβ oligomers in cerebrospinal fluid than non-carriers with their kinetics suggesting an earlier start of the disease process (Blömeke et al., 2024). In APOE4 homozygotes, the acceleration is even more pronounced. One study found that onset occurred about a decade earlier than in non-carriers, CSF Aβ42 levels were already low by the late 40s, and by the early 50s, amyloid-PET and CSF p-tau181 readings were abnormal (May 2024 news, Fortea et al., 2024). Consistent with these findings, more rapid changes in plasma AD biomarkers from midlife to late life were observed in APOE4 carriers than non-carriers (Lu et al., 2024). Interestingly, alterations in brain lipid metabolism associated with APOE4 appear to emerge early, possibly preceding amyloid plaques (Apr 2023 conference news; Mares et al., 2024).
APOE4 also seems to accelerate onset in individuals with familial LOAD (Reyes-Dumeyer 2022) or AD associated with Down syndrome, despite the already severe amyloid burden caused by chromosome 21 trisomy (Bejanin et al., 2021; July 2021 news). Moreover, individuals with young-onset dementia (Hendriks et al., 2024; Jan 2024 news) or sporadic early onset AD (Hammers et al., 2023) are more likely to be homozygous for APOE4. Also, in autosomal-dominant AD (ADAD), data from PSEN1 E280A (Paisa) carriers revealed an age-related acceleration of cognitive decline associated with APOE4 (Langella et al., 2023). However, the allele's effects on ADAD may vary based on mutation type (Almkvist et al., 2022).
Whether and under what circumstances APOE4 affects disease progression remains uncertain, although most studies suggest it accelerates it. For example, faster cognitive decline has been reported in carriers versus non-carriers (e.g., Jutten et al., 2021; Qian et al., 2021; but see Katzourou et al., 2021), as well as shorter disease duration (e.g., Vermunt et al., 2019). Imaging studies suggest APOE4 accelerates the atrophy of brain areas affected by AD, increases the rate of amyloid deposition, and enhances and accelerates tau deposition (for review see Koutsodendris et al., 2021, Steward et al., 2023). One study found APOE4 contributes more to the conversion from amyloid negative/tau negative (A-T-) to A+T-, than from A+T- to A+T+, with APOE4 homozygotes driving the latter (Altmann et al., 2024). Another study, described in a preprint, found tau in APOE4 homozygotes accumulating more rapidly in the entorhinal cortex, for a given Aβ load, and then spreading more widely to the neocortex than in non-homozygotes (Giorgio et al., 2024). The latter observations are consistent with findings indicating phosphorylated tau interacts preferentially with synaptic proteins and cellular transport components in the frontal cortex of APOE4 homozygotes, a possible indication of ApoE4 facilitating the spread of tau pathology (Thierry et al., 2024). Moreover, some studies suggest APOE4 may speed up cognitive decline independently of its effects on neuropathology (Qian et al., 2021; Qian et al., 2023).
APOE4-Related AD and its Modulation
Interestingly, APOE4-related AD appears to be distinct from APOE4-unrelated AD (Vogel et al., 2021; Apr 2021 news; Frisoni et al., 2021). Proteomic, transcriptomic, and metabolomic analyses of cerebrospinal fluid (CSF), brain tissue, plasma, and cerebral organoids derived from patient stem cells have all revealed APOE4-dependent profiles, including a unique signature of disease progression (e.g., Dai et al., 2018; Zhao et al., 2020; Konijnenberg et al., 2020; Madrid et al., 2021; Chang et al., 2022; Das et al., 2023; Brase et al., 2023; Oveisgharan et al., 2024; Shvetcov et al., 2024). Hallmarks of APOE4-related AD include particularly high levels of tau pathology and atrophy in the medial temporal lobe (Emrani et al., 2020; La Joie et al., 2021), changes in the structural relationships between sites of early tau pathology and the white matter through which they project (Wearn et al., 2024), association of AD phenotypes with plasma inflammation markers (Tao et al., 2023), as well as altered blood-brain barrier function, cerebral blood flow, and meningeal lymphatics (Montagne et al., 2020; May 2020 news; Chen et al., 2021; Sep 2022 conference news, Sun et al., 2023; Jun 2023 news).
Unique APOE4-associated changes have also been reported in presymptomatic APOE4 carriers who later developed AD, as revealed by proteomics studies in plasma and CSF (Frick et al., 2024; Sep 2024 news; Dammer et al., 2024; Sep 2024 news). Proteins identified in these studies included species involved in microtubule and centromere functions, neuronal response and development, neuroinflammation, neddylation, MAPK signaling, mitochondrial function, and glycolysis. Some of the findings were unexpected. For example, four proteins downregulated in APOE4 carriers, were upregulated in noncarriers as AD onset approached (Frick et al., 2024; Sep 2024 news). Also, unbiased sorting of individuals based on their CSF proteomes resulted in groups that included individuals with different clinical phenotypes and different AD biomarker profiles (Dammer et al., 2024; Sep 2024 news). These observations suggest APOE4 effects are complex, extending beyond the pathologies tracked by Aβ and tau biomarkers, and likely including both detrimental and compensatory effects.
Moreover, age and genetic factors, including gender, modify APOE4’s effects on AD risk, generally having a stronger influence on people between the ages of 60 and 75, and on women, whose risk peaks at an earlier age than that of men (Farrer et al., 1997; Bickeböller et al., 1997; Altmann et al., 2014; Neu et al., 2017; Sep 2017 news; Nemes et al., 2023; Belloy et al., 2023). Although men’s shorter average lifespan compared to women’s may confound some age-related gender associations (Merrick and Brayne, 2024), multiple studies suggest gender is an important modifier of APOE4. In addition to affecting APOE4-associated AD risk, sex differences have been reported in biomarkers of pathology, particularly in cerebrospinal fluid tau, with women having higher levels than men in amyloid-positive individuals (Hohman et al., 2018; May 2018 news). Disease stage may be relevant, with one study showing higher CSF phospho-tau levels in women than men, but only during pre-dementia stages of disease (Babapour Mofrad et al., 2020). In addition, women carriers appear to be particularly susceptible to tau pathology (Feb 2019 news; Nov 2019 news). APOE4-associated gene–gene interactions affecting both AD risk and longevity have also been reported to differ between men and women (Dato et al., 2023). Also of note, differences in brain structure between individuals—especially in the hippocampus and default network which are particularly vulnerable to AD—may influence APOE4-associated AD risk in a sex-dependent manner (Savignac et al., 2022).
Clues to the molecular underpinnings of gender-associated differences are beginning to emerge from experimental systems. For example, one study in mice suggested that follicle-stimulating hormone, which rises in post-menopausal females, may contribute to APOE4 vulnerability (Xiong et al., 2023). Also, a genetic variant that regulates microglial activation was identified as a gender-specific modifier of APOE4 AD risk (July 2022 news; Jiang et al., 2022). Interestingly, a search for DNA methylation patterns associated with APOE4 and AD revealed an abundance of genes encoding proteins of the estrogen response pathway (Panitch et al., 2024).
Environmental factors also modify APOE4’s effects. For example, infections, in particular by the herpes virus, may boost AD risk (Apr 2021 conference news), while a healthy lifestyle may reduce it (e.g., Jia et al., 2023). However, many such effects are complex and not well understood, with some studies suggesting negligible effects (e.g., Neuffer et al., 2024). Healthy lifestyle choices, for example, may need to be adopted early in life to be protective against APOE4-associated risk (e.g., Aug 2019 news). Indeed, alterations tied to APOE4 expression at the molecular, cellular, and behavioral levels have been detected decades before disease onset (e.g., Oct 2015 news; Dec 2021 news). Also of note, APOE4 may itself modulate the effects of environmental factors, such as education (e.g., Rajabli et al., 2024; Glans et al., 2024).
The Role of Other Variants in APOE4 Pathogenicity
APOE4’s effect on AD risk is modulated by other genetic factors and some studies suggest these modifiers are abundant. Several have been traced to the APOE region, which includes APOE and a few neighboring genes, while others are far-flung, including variants in other chromosomes (e.g., Kim et al., 2020; Dec 2020 news; Ebenau et al., 2021; Huq et al., 2021; Nazarian et al., 2022; Nazarian et al., 2022; Sep 2022 news).
An example of a nearby modulator is APOE R269G, a rare variant within APOE itself that is co-inherited with APOE4. In a large association study including more than 500,000 participants, it was associated with a twofold reduction in AD risk (June 2022 news; Le Guen et al., 2022). Although its biological effect is unknown, it is suspected to have a direct effect on ApoE function, possibly altering lipid binding and/or oligomerization. Another APOE variant, APOE R154S (Christchurch), may also modulate APOE4 toxicity. In human neurons derived from induced pluripotent stem cells (iPSCs) and a tauopathy mouse model, homozygous Christchurch rescued APOE4-associated tau pathology and, in the mouse model, it also protected against APOE4-driven neurodegeneration and neuroinflammation in a gene dose-dependent manner (Nelson et al., 2023).
Klotho-VS, a set of two polymorphisms, F352V and C370S, in the longevity gene Klotho, offers an example of a distant modulator. In heterozygous form, Klotho-VS cuts APOE4 AD risk by approximately a third (Erickson et al., 2019; Belloy et al., 2020; Apr 17 news). It appears to accomplish this by lowering amyloid-dependent tau accumulation (Aug 2020 news; Neitzel et al., 2021). Even in non-demented APOE4 carriers, Klotho-VS has been associated with reduced amyloid and tau pathologies (Belloy et al., 2021; Driscoll et al., 2021; Ali et al., 2022; see also Grøntvedt et al., 2022). The relationships between Klotho-VS, ApoE, and AD are complex, however. For example, Klotho heterozygosity has also been reported to slow down cognitive decline specifically in male AD patients who do not carry APOE4 (Chen et al., 2023).
Other variants that may temper APOE4’s damaging effects reside in genes or intergenic regions neighboring APOE (see APOE region), or in genes whose encoded proteins may affect ApoE function such as a common variant of the hemoglobin scavenger haptoglobin that also binds to ApoE and is thought to protect ApoE from oxidation (Bai et al., 2023). Others include modulators of microglial function such as a variant in the IL1RL1 gene that alters microglial activation (July 2022 news; Jiang et al., 2022), the G78R allele of PILRA which regulates microglial neuroinflammation and lipid metabolism (July 2024 news; Monroe et al., 2024 preprint), and P522R in the phospholipase Cγ2 (PLCG2) gene which also appears to be expressed in microglia although its effects remain unclear (van der Lee et al., 2019; May 2019 news; Kleineidam et al., 2020). Moreover, variants in Wnt signaling genes (Lin et al., 2021; Sep 2021 news), rare variants in the fibronectin-1 gene (May 2024 news, Bhattarai et al., 2024), and the P3S variant of the mitochondrial-derived peptide humanin prevalent among individuals of Ashkenazi ancestry (Miller et al., 2024) have also been identified as APOE4 modifiers. Also, expression levels of additional genes (VGF, SPECC1L, HLA-DRA, and RANBP3L) have been reported to shape APOE4-associated AD risk (Branciamore et al., 2024).
Of note, APOE4 may itself act as a modulator of the effects of variants. For example, the penetrance of loss-of-function variants in the SORL1 gene, another strong genetic risk factor for AD, appears to be increased by the presence of APOE4 alleles in a dose-dependent manner (Schramm et al., 2022).
APOE4 and Ancestry
Interestingly, ancestry plays an important role in determining APOE4 consequences (table below shows data from comparative studies). Since the mid-1990s, there have been reports of a weaker effect of APOE4 on AD risk in people of African ancestry compared with Caucasians (Maestre et al., 1995; Tang et al., 1996; Farrer et al., 1997). Also, APOE4 has been found to confer higher risk in East Asians, and lower risk in Hispanics, compared with whites (see Harerimana et al., 2022 for review). Large studies including tens of thousands of individuals support these observations (e.g., Belloy et al., 2023; Rajabli et al., 2023; Choi et al., 2019). Ancestry-based differences have also been reported in the association of APOE4 with AD endophenotypes, such as amyloid PET levels (Ali et al., 2023).
Efforts to identify the genetic regions responsible for differences in AD risk have revealed nearby sequences, also known as local ancestry regions (LAR), in the APOE region (e.g., Rajabli et al., 2018; Babenko et al., 2018; Rajabli et al., 2022), with some studies pinpointing variants of interest (Zhang et al., 2018; Choi et al., 2019; Nuytemans et al., 2022; Granot-Hershkovitz et al., 2023). Although the mechanisms underlying the associations remain unclear, modulation of APOE gene expression is a likely candidate. For example, a study of single-nuclei RNA in the frontal cortices of APOE4 homozygotes indicated that carriers of European LARs expressed higher levels of APOE4 than carriers of African LARs (Griswold et al., 2021).
Many questions about how ancestry shapes APOE4's effects on AD risk remain. One challenge is disentangling the contributions of environmental factors. Indeed, modifiable risk factors which often vary between groups of different ancestries—such as lower education levels, smoking, and physical inactivity—appear to exacerbate the effects of APOE4 on dementia. Moreover, as reported in a preprint, the effectiveness of different methods to measure modifiable risks also varies between populations (Andrews et al., 2024).
Another challenge is dissecting the roles of different ancestries in admixed populations, such as Hispanic groups. The effects of African and European local and global ancestries have been examined in Hispanics, as well as the potential contributions of Amerindian ancestry, sometimes yielding conflicting results (Blue et al., 2019; Marca-Ysabel et al., 2021; Belloy et al., 2023). Moreover, some studies have failed to find ancestry-associated differences in the effects of APOE4 on AD and AD-related cognitive decline, or have failed to confirm the APOE region as the source of these differences (e.g., Knopman et al., 2009; Sawyer et al., 2009; Mezlini et al., 2020; Curtis, 2021, Mukadam et al., 2022). Differences in demographic variables, sample sizes, analytical and statistical methodologies, measures of cognition, and racial bias in assessing dementia have been proposed as factors accounting for these discrepancies. Also of note, methodological limitations are potentially relevant to many APOE association studies. For example, the variability in the reliability of widely used APOE genotyping methods may result in irreproducible findings (Belloy et al., 2022).
APOE4 is more prevalent in Africans and Oceanians than in Europeans, particularly non-Finnish Europeans, with Asians and Hispanics/Latinos having the lowest frequency (Kamboh et al., 1995; Wang et al., 2021; gnomAD v2.1.1, Sep 2022).
Non-AD Neurological Disorders
APOE4 has also been associated with non-AD pathologies and conditions. Some of them often accompany AD (see Belloy et al., 2019), such as cerebral amyloid angiopathy (CAA; e.g., Premkumar et al., 1996; Rannikmäe et al., 2014; Reiman et al., 2020), the more severe inflammatory form of CAA (Grangeon et al., 2022), and AD psychosis (DeMichele-Sweet et al., 2021). Also, APOE4 homozygosity has been associated with a modest increase in risk for ischemic cerebrovascular disease (Rasmussen et al., 2023), a condition which can co-occur with CAA. Other conditions are independent of AD, including some neuropathologies associated with transactive response DNA-binding protein of 43 kDa (TDP-43), such as limbic-predominant age-related TDP-43 encephalopathy (LATE) and hippocampal sclerosis (e.g., Yang et al., 2018; Dugan et al., 2021), as well as negative outcomes after traumatic brain or spinal cord injury (e.g., Atherton et al., 2022; Feigen et al., 2024; Schneider et al., 2024). Moreover, APOE4 appears to increase the risk of impaired cognition and multiple neurodegenerative proteinopathies (Walker and Richardson 2022, Maldonado-Díaz et al., 2024).
Interestingly, in Parkinson’s disease (PD), APOE4 has been associated with a change in the progression of the disease. APOE4 appears to accelerate cognitive decline (Paul et al., 2016; Tan et al., 2020; Liu et al., 2021) and, in carriers with a high amyloid burden, hasten motor deterioration (Pu et al., 2021). Also of note, although a substantial number of PD patients develop AD pathology, APOE4 may drive PD dementia by a mechanism independent of AD pathology (Wu et al., 2023).
Multiple studies have reported associations between APOE4 and dementia with Lewy bodies (e.g., Hardy et al., 1994; Tsuang et al., 2013; Guerreiro et al., 2017; Dec 2017 news). However, while some studies suggest this association is due to the common co-occurrence of Lewy body (LB) pathology with AD pathology (e.g., Kaivola et al., 2022), others suggest APOE4 affects the two pathologies independently of each other (e.g., Tsuang et al., 2013; Wu et al., 2024). Consistent with the former possibility, a large GWAS meta-analysis, indicated APOE4 is associated with risk of AD+LB– and AD+LB+ compared with AD–LB–, but not with risk of AD–LB+ compared with AD–LB– or risk of AD+LB+ compared with AD+LB– (Talyansky et al., 2023). Of note, at least one TDP-43opathy appears to be unaffected by APOE4: a large meta-analysis including 4,000 amyotrophic lateral sclerosis cases and 10,000 controls found no association between the allele and the disease (Govone et al., 2014).
Several studies have reported significant associations between APOE4 and age-related cognitive decline (e.g., Davies et al., 2014; Raj et al., 2016; Corley et al, 2022; Tomassen et al., 2022; Rietman et al., 2022; Palmer et al., 2023), with all cognitive domains tested, particularly memory, being affected (e.g., Kang et al., 2023, Pettigrew et al., 2023, Sun et al., 2023; Jun 2023 news). Interestingly, some of the declines appeared to be mitigated by cognitive reserve (Pettigrew et al., 2023) and APOE4's negative impact on baseline memory appeared to be stronger in women than in men (Walters et al., 2023). Also, in a study of several cohorts with different neurodegenerative and cerebrovascular disorders, APOE4 carriers performed consistently worse on tests of verbal memory and visuospatial skills, regardless of their diagnoses (Dilliott et al., 2021).
Importantly, several studies have indicated APOE4 exerts little or no effect on baseline general cognitive function (e.g., Davies et al., 2018, Rietman et al., 2022, Rahman et al., 2024, Daly et al., 2024). A study of nearly 10,000 English individuals aged 17–85 years, for example, identified associations with performance in 11 cognitive tests, as well as age-by-APOE interaction effects, but none survived correction for multiple testing (Rahman et al., 2024)
Nevertheless, cognitively unimpaired APOE4 carriers may be more prone to some neuropathological and functional alterations. One study, for example, identified APOE4 carriership as distinctive of a subgroup of cognitively healthy individuals with signs of accelerated brain aging (Skampardoni et al., 2024). Also, APOE4 has been associated with more rapid loss of slow-wave sleep (Himali et al., 2023) and reduced duration of rapid eye movement (REM) sleep (André et al., 2024) during normal aging. Moreover, p-tau181 levels in plasma were elevated in a group of APOE4 carriers who remained healthy after age 85 (Cooper et al., 2024) and, as reported in a preprint, cognitively healthy centenerian carriers tended to have higher Aβ loads in brain than non-carriers (although half of the carriers had Aβ levels below those associated with AD, suggesting resilience to Aβ accumulation; Rohde et al., 2023). Also, a PET imaging study of middle-aged individuals indicated that, in the context of elevated amyloid and tau, APOE4 worsened cognition (Gonzales et al., 2024).
Other studies have found alterations in the functional connectivity of AD-relevant brain networks—some of which may be compensatory—in unimpaired middle-aged and young carriers (Kucikova et al., 2023; Cacciaglia et al., 2023). Age-dependent association of APOE4 with smaller hippocampal volumes has also been reported (e.g., Fortea et al., 2024; Chaloemtoem et al., 2024) . Moreover, several studies have tied APOE4 to reductions in white matter integrity in cognitively healthy carriers (Heise et al., 2024; Tato-Fernández et al., 2024; Soldan et al., 2024). Indeed, APOE4-associated brain changes have been reported even among infants and young children (Dec 2013 news).
In some instances, however, APOE4 may be neurologically protective. For example, some studies indicate it decreases the risk of age-related macular degeneration (e.g., Fritsche et al., 2016; Rasmussen et al., 2022) and, as suggested in a preprint, progressive supranuclear palsy (Wang et al., 2024; Feb 2024 news). Moreover, APOE4 has been reported to confer a slight cognitive advantage early in life, which declines with age (Lu et al., 2021; Oct 2021 news).
Non-Neurological Conditions
APOE4 was initially shown to play a role in lipid transport and cardiovascular disease (see Mahley et al., 2009; Mahley 2016). Its preference for interacting with very low-density lipoprotein (VLDL) in blood is thought to accelerate these particles’ uptake. This in turn causes a downregulation of cell surface receptors that bind ApoE which then leads to an increase in circulating cholesterol-rich LDL particles.
Large association studies of white individuals in general population cohorts revealed increases in most blood lipids—including LDL cholesterol, ApoB, and the ratio of ApoB to ApoA1 which are tied to atherosclerosis risk—sphingomyelin, and triglycerides in APOE4 carriers relative to APOE3 homozygotes (Rasmussen et al., 2019, Rasmussen et al., 2023, Compton et al., 2024). In contrast, ApoE and high-density lipoprotein (HDL) cholesterol were decreased. Interestingly, most of these differences were detected across all age groups, including children and young adults (Compton et al., 2024) but waned in older carriers, particularly after age 60. Moreover, two large studies of individuals of European ancestry indicated APOE4 is associated with age-related weight loss, independent of baseline obesity and dementia (Venkatesh et al., 2024; Kemper et al., 2024).
Additional studies have shown associations of APOE4 with other metabolic alterations (e.g., Li et al., 2020; Ferguson et al., 2020). Also, a study of primary human hepatocytes revealed altered lipidomic signatures, suggesting disruptions of mitochondrial function and free fatty acid metabolism (Almeida et al., 2024).
APOE4 carriers have a higher risk of other medical conditions as well. For example, they are more likely to get infected by SARS-CoV-2 and die with COVID than non-carriers (Jan 2021 news; Ostendorf et al., 2022). As assessed in a COVID mouse model and in vitro experiments, potential mechanisms underlying this vulnerability include elevated viral loads, suppressed adaptive immune responses early after infection, and detrimental effects on astrocytes and neurons. Also, APOE4 carriers may be more likely than non-carriers to develop neurovascular complications associated with COVID (May 2023 conference news). They may also be more prone to accumulate chromosomal alterations with age (Leshchyk et al., 2023).
Indeed, multiple studies have found associations between APOE4 and an increased risk of death (see Abondio et al., 2019 for review). Interestingly, a study of more than 14,000 individuals from the UK and France, suggested that dementia contributed substantially to the association with all-cause mortality in APOE4 homozygotes, while other factors, particularly cardiovascular disease, elevated death risk in APOE4 heterozygotes (Régy et al., 2024). Consistent with these findings, analysis of nearly 400,000 Europeans indicated APOE4 was associated with decreased lifespan and the frequency of APOE4 carriers was higher among individuals who died from diseases of the circulatory system and diseases of the nervous system, as reported in a preprint (Park et al., 2024). Of note, the reduced lifespan associated with APOE4 carriership can complicate the interpretation of associations with other conditions by introducing survival bias (e.g., von Berg et al., 2024).
A few studies have revealed protective effects, however, such as a better prognosis for melanoma (Ostendorf et al., 2020) and a lower risk for non-alcoholic fatty liver disease and obesity (e.g., Palmer et al., 2021, Huebbe et al., 2023). APOE4 has also been tied to a moderate enhancement in myocardial function (Topriceanu et al., 2024). Interestingly, one study suggested that, although APOE4 carriers with high levels of AD neuropathology at death had higher mortality risk than non-carriers, APOE4 carriers with low levels of AD neuropathology had a lower mortality risk than non-carriers (Pirraglia et al., 2023).
Also, it has been suggested that APOE4 may provide an evolutionary advantage in highly infectious environments, such as those experienced by early humans (e.g., van Exel et al., 2017; Garcia et al., 2021, Smith and Ashford, 2023, Trumble et al., 2023). In non-industrialized, subsistence communities, APOE4 was associated with increased fertility, better immune activation during infection, and lower levels of baseline inflammation, which may outweigh the neurological and cardiovascular risks identified in industrialized populations. Moreover, even in European populations, extreme climate conditions, which influence cholesterol demand, and an increased need for vitamin D may have fueled APOE4 selection (see Harerimana et al., 2022 for review).
Biological Effects
ApoE4 has been implicated in a remarkable number of alterations associated with AD, including gain- and loss-of-function effects (see Yamazaki et al., 2019; Belloy et al., 2019; Serrano-Pozo et al., 2021; Koutsodendris et al., 2021; Martens et al., 2022; Steele et al., 2022 for reviews), with most studies pointing to gains of function as major contributors to the allele’s toxicity (Vance et al., 2024).
APOE4 appears to exacerbate both hallmark AD pathologies, amyloid plaques (e.g., Nov 2021 news; July 2021 news; May 2019 conference news; Jul 2018 news; Jun 2018 news; Jan 2017 news) and neurofibrillary tangles (e.g., Sep 2017 news; June 2018 news; Apr 2021 news; Saroja et al., 2022; Nov 2022 news; Jan 2023 news). In addition, it has been blamed for altering lipid transport and metabolism in brain cells (e.g., Nov 2021 conference news; Mar 2021 news; Aug 2019 news; Apr 2019 conference news; Jul 2018 conference news, Apr 2023 conference news) and fueling neuroinflammation (Nov 2021 conference news; Jul 2018 conference news; Aug 2019 news; Asante et al., 2022; Parhizkar and Holtzman 2022; Kloske et al., 2023), abnormal cellular stress responses (e.g., Martens et al., 2022), neurodegeneration (e.g., May 2021 news; Apr 2021 news; Oct 2019 news), and blood-brain barrier breakdown (e.g., Jun 2020 news; May 2020 news; Sep 2022 conference news; Denkinger et al., 2024).
ApoE4 has also been reported to reduce neurogenesis (e.g., Oct 2020 news; Aug 2018 news), alter neuronal structure and function (e.g., Koutsodendris et al., 2021), disrupt endocytosis and intracellular trafficking (e.g., Martens et al., 2022; July 2021 news; Oct 2020 news), impair mitochondrial function, energy metabolism (Mahley 2023) and mitophagy (e.g., Hou et al., 2023), as well as modify DNA methylation (e.g., Panitch et al., 2024) and transcription (e.g., Theendakara et al., 2018), including enhancing the expression of APP (Jan 2017 news, Huang et al., 2017). At a tissue level, it appears to alter brain glucose metabolism (e.g., Johnson, 2020; Yassine and Finch, 2020) and cause neural network dysfunction (e.g., Koutsodendris et al., 2021).
Although it is unclear which of these myriad alterations play primary roles in the disease process, several occur during the initial stages of disease. Through multiple mechanisms, ApoE4 is thus thought to initiate a cascade of early alterations leading to later pathological changes (Koutsodendris et al., 2021; Martens et al., 2022; Steele et al., 2022).
Also of note, in addition to its effects on AD pathology, ApoE4 may fuel other types of neurodegenerative damage. Indeed, ApoE interacts with multiple amyloid proteins in addtion to Aβ (for review see Loch et al., 2023). For example, a post-mortem study indicated increased ApoE accumulation in the Lewy bodies of APOE4 carriers with Lewy body dementia, and other studies suggest ApoE4 exacerbates α-synuclein pathology, increasing the seeding of aggregates that are particularly toxic to neurons (e.g., Feb 2020 news; Zhao et al., 2021; Jin et al., 2022). In mouse models of synucleinopathy, ApoE4 worsened neurodegeneration, inflammation, memory loss, and motor deficits. APOE4 has also been implicated in functional and structural changes associated with age-related cognitive impairment (Palmer et al., 2023).
Molecular Level Effects
How a single amino acid substitution triggers this cascade remains uncertain. The replacement of a cysteine by an arginine makes ApoE4 more basic than ApoE3. One possible consequence is reduced solubility in early endosomes which can disrupt vesicular trafficking (e.g., July 2021 news). The substitution also affects ApoE's functional regions: ApoE4 binds lipids more poorly, heparin more tightly, and is more prone to self-aggregation than ApoE3. The structural underpinnings of these differences have yet to be elucidated. Initial studies predicted an interaction between R79 and Glu273 mediated by ApoE4’s arginine in the C130 position, resulting in a tighter interaction between the N-terminal and C-terminal domains of the protein (Hatters et al., 2005, Xu et al., 2004). However, the importance of this bridge has been called into question and other models hint at increased flexibility of the bundle of helices in the N-terminal domain (see Chen et al., 2020 for review).
Of note, even under highly controlled conditions, with ApoE4 in monomeric form, the protein appears to adopt multiple configurations (Stuchell-Brereton et al., 2023). Moreover, ApoE4 is predicted to change conformation depending on its lipidation status, association with other molecules (including other ApoE proteins), post-translational modifications, and microenvironment. Insights into ApoE4’s behavior under these diverse conditions are beginning to emerge. For example, one study indicated lipid-free ApoE4 forms V-shaped dimers with the N-terminal domains coming together at an angle that likely fuels aggregation and is different from that formed by ApoE3 and ApoE2 dimers (Nemergut et al., 2023). Of particular physiological relevance, a high-resolution structural analysis of lipidated ApoE in astrocyte-secreted lipoproteins suggested two ApoE proteins wrap around a lipid disc in an anti-parallel conformation (Feb 2024 news; Strickland et al., 2024). The resulting lipoprotein particle was smaller when formed by ApoE4 than by ApoE2 or ApoE3.
Distinct Cell Type Effects: Glial Cells
Interestingly, the cellular source of ApoE4 appears to be important in determining its consequences (see Blumenfeld et al., 2024 for review). In glial cells, ApoE4 has been reported to disrupt lipid metabolism, altering cholesterol and cholesterol ester production and export, as well as disrupting lipid droplet number, size, and composition (e.g., Sep 2023 news, Haney et al., 2024, Aug 2019 news, March 2019 news, Nov 2021 news, Nov 2022 news, Windham and Cohen, 2023, Nov 2023 news, Windham et al., 2024, Feringa et al., 2024). It also has been shown to impair endolysosomal trafficking, alter mitochondrial metabolism, and upregulate innate immune pathways.
ApoE4-expressing microglia have distinct immune and metabolic transcription profiles associated with aging, amyloid and tau pathologies, inflammatory challenge, and brain plasticity. These are characterized by enhanced glycolysis (Lee et al., 2023), altered regulation of genes involved in extracellular matrix organization and chondroitin sulfate biosynthesis (Brase et al., 2023), and changes in the expression of genes that define homeostatic versus disease-associated states (Lee et al., 2023, Yin et al., 2023, Liu et al., 2023, Oct 2023 news). Moreover, microglial efferocytosis—the clearance of apoptotic cells and debris in the brain—has been identified as a genetic risk hub for AD, with ApoE4 affecting multiple steps in this process (Romero-Molina et al., 2022).
Several studies have reported that ApoE4 microglia have sluggish phagocytosis and heightened inflammatory responses compared with their ApoE3 counterparts (e.g., June 2018 news, Aug 2019 news, Sep 2019 news, Murphy et al., 2024 preprint), and appear to be locked in a state of homeostasis unable to clear plaque or tangles efficiently (Sep 2022 conference news, Oct 2023 news). Dysregulation of microglial receptors may underlie some of ApoE4's effects on microglial behavior. For example, increased binding of ApoE4, compared with ApoE2 or ApoE3, to the microglial leukocyte immunoglobulin-like receptor B3 (LilrB3) may facilitate pro-inflammatory activation of microglia (Zhou et al., 2023), while decreased expression of the microglial P2RY12 receptor may slow down migration of these cells towards Aβ (Sepulveda et al., 2024). ApoE4 may also accelerate the emergence of terminally inflammatory microglia (TIM), a reactive microglia subtype that accumulates during aging and is characterized by a less inflammatory, functionally impaired state analogous to that of exhausted T cells (Millet et al., 2023).
Multiple effects on the function of astrocytes—which express high levels of ApoE—have also been reported, including dysregulation of lipid metabolism and matrisome signaling, increased inflammatory signaling, and reduced Aβ uptake (e.g., Lin et al., 2018; Qi et al., 2021; de Leeuw et al., 2022; Tcw et al., 2022; Watanabe et al., 2023). As suggested in a preprint, ApoE4 also appears to suppress astrocytic immune activation which may occur via enhanced cholesterol esterification (Feringa et al., 2024).
In addition, ApoE4 has been reported to alter glial-neuronal interactions: driving tau-mediated neurodegeneration via glia-derived ApoE4 (Shi et al., 2019; Oct 2019 news; Wang et al., 2021; Apr 2021 news, Haney et al., 2024), disrupting immune signaling associated with neuroinflammation (e.g., Aug 2019 news; Tcw et al., 2022; Serrano-Pozo et al., 2021; Parhizkar and Holtzman 2022; Chernyaeva et al., 2023), and perturbing neuron-astrocyte coupling of lipid metabolism (e.g., Qi et al., 2021; Oct 2023 conference news). Moreover, in the context of tau pathology, microglial ApoE4 appears to induce lysosomal abnormalities and ramp up synapse phagocytosis (Gratuze et al., 2022; Nov 2022 news). Astrocytic ApoE4 may also affect synapses, decreasing dendritic spine density and altering their architecture (Watanabe et al., 2023). In addition, ApoE4 may disrupt axon myelination by affecting oligodendrocyte health and differentiation (Cheng et al., 2022, Blanchard et al., 2022, Mok et al., 2022), impair microglial surveillance of the activity of neuronal networks (Victor et al., 2022), and possibly interfere with the regulation of neuronal gene expression via astrocyte-derived miRNAs (Li et al., 2021).
Distinct Cell Type Effects: Neurons
ApoE4 also appears to fuel neurodegeneration directly within neurons. Although neurons normally produce much less ApoE than glial cells, with age, certain neurons increase production. This correlates with elevated expression of antigen-presenting genes, tau pathology, and ultimately cell death. In APOE4 knockin mice, this ApoE surge occurred earlier than in controls (May 2021 news), and a preprint reported early hyperexcitability in a subpopulation of hippocampal excitatory neurons (Tabuena et al., 2024). In a tauopathy mouse model, removing ApoE4 from neurons drastically reduced neurofibrillary tangles, tau-mediated gliosis, and myelin loss (Feb 2023 news; Koutsodendris et al., 2023). Moreover, human APOE4 neurons transplanted into the hippocampi of APOE4 knockin mouse generated Aβ and phospho-tau aggregates, and elevated the levels of pro-inflammatory microglia, as reported in a preprint (Rao et al., 2023). Interestingly, tau pathology in these mice was dependent on the presence of microglia.
Several mechanisms have been suggested to explain ApoE4’s effects in neurons. For example, ApoE4 can be aberrantly cleaved in neurons to generate toxic C-terminal fragments. These fragments can cause mitochondrial dysfunction, tau pathology, and neuronal death (Koutsodendris et al., 2021). Moreover, one study found ApoE can inhibit Aβ production by binding to γ-secretase in neurons, and ApoE4 is less capable of doing so compared with ApoE3 and ApoE2 (Hou et al., 2023). Also, a preprint suggested ApoE4 may drive tau aggregation in neurons by disrupting the function of neuroproteasomes—proteasomes localized to neuronal plasma membranes that degrade newly synthesized proteins, including tau (Paradise et al., 2023). As assessed in iPSC-derived neurons, another effect of neuronal ApoE4 expression may be increased mitochondrial ATP production (Budny et al., 2024).
Distinct Cell Type Effects: Vascular Cells
Vascular cell function seems to be affected by ApoE4 as well. In pericytes, for example, ApoE4 appears to cause alterations that disrupt the blood-brain barrier (e.g., Bell et al., 2012; May 2012 news; May 2020 news; Montagne et al., 2021) and, in a 3D cell-culture model system, it promoted cerebral amyloid angiopathy (Blanchard et al., 2020; Jun 2020 news). In addition, ApoE4 is associated with changes in gene expression in endothelial cells, pericytes, and perivascular fibroblasts (Sep 2022 conference news, Sun et al., 2023). Vascular cell function may also be affected indirectly by expression of ApoE4 in astrocytes. In AD mice with ApoE4-deficient astrocytes, for example, gliosis was dampened, and cerebrovascular integrity and function were improved, although Aβ deposition shifted from the brain parenchyma to the vasculature (Xiong et al., 2023). ApoE4 may also facilitate the pathological accumulation of fibronectin 1 and gliosis in the vasculature (May 2024 news, Bhattarai et al., 2024). Moreover, observations reported in a preprint revealed that, in mice, macrophages closely apposed to neocortical microvessels, a.k.a. border associated macrophages, produce ApoE4 and react to it, releasing reactive oxygen species that result in resticted cerebral blood flow (Apr 2023 conference news, Iadecola et al., 2023).
Peripheral Effects on Brain Health
Interestingly, although ApoE produced systemically, by the liver and peripheral macrophages, is excluded from the brain, increasing evidence suggests it is tied to neurological health. For example, a study of more than 100,000 Danes found that APOE genetic variants associated with low ApoE levels in plasma, including APOE4, were more likely to be associated with an increased risk for dementia, and for AD in particular (Rasmussen et al., 2020). Also, low plasma ApoE levels were associated with CSF AD biomarkers in patients with mild cognitive impairment and AD (Giannisis et al., 2022). Heparin-bound ApoE4, however, may be increased in AD plasma together with other heparin-binding proteins tied to AD, as reported in a preprint (Guo et al., 2023).
Peripheral immune responses appear to be affected by the presence of ApoE4. For example, one study found epigenetic changes in circulating immune cells of AD patients suggesting links between the periphery and the brain involving APOE genotype (Feb 2024 news; Ramakrishnan et al., 2024). In particular, enhanced chromatin accessibility of pro-inflammatory genes in several types of peripheral immune cells was observed in AD APOE4 carriers. Notably, APOE4-affected genes included AD risk genes BIN1 and ABCA1. Moreover, a global map of peripheral immune changes in AD patients suggested that APOE4 influences a wide range of metabolic and immunological pathways across different clinical stages of AD (Olst et al., 2024). APOE4-associated alterations of the functions of T cell subytpes have also been reported (e.g., Zhang et al., 2024; Hu et al., 2024).
Although some experiments in mice have failed to detect effects of peripheral ApoE in the brain (e.g., Huynh et al., 2019), several studies have revealed substantial consequences. For example, in mice transplanted with primary human hepatocytes, peripheral ApoE was found to affect cognitive behaviors, synaptic health, neuroinflammation, insulin signaling, and cerebrovascular function (Giannisis et al., 2022; Liu et al., 2022; see also Golden and Johnson 2022). Analyses of brain tissue and plasma proteome profiling of conditional mouse models expressing human APOE4 only in the liver, as well as from a human endothelial cell model, suggest these various effects stem from vascular dysfunction (Liu et al., 2022). Also of note, breeding these conditional mice with an AD mouse model exacerbated amyloid pathology. In female APOE4 carriers, blood neutrophils infiltrating into the brain may blunt microglial responses to amyloid plaque pathology (Rosenzweig et al., 2024).
Moreover, peripheral effects on carrier health could also have indirect, AD-related consequences. For example, C-reactive protein (CRP) released during peripheral inflammation may contribute to APOE4-related AD neurodegeneration (Tao et al., 2021, Royall et al., 2017). Also, in one study, initiating statin treatment, which helps lower cholesterol levels in blood, was associated with a lower risk of incident AD and cognitive decline specifically in APOE4 carriers (Rajan et al., 2024). Another consideration is that APOE4 carriers’ elevated risk of cardiovascular disease may select for populations of older carriers enriched in metabolic traits that enabled them to survive the risk past mid-life. These traits may modify LOAD risk and/or expression (Wu et al., 2021). Also of note, APOE4 appears to influence the composition of the gut microbiome (e.g., Zajac et al., 2022) which in turn may affect the progression of at least some neurodegenerative pathologies (e.g., Seo et al., 2023, Jan 2023 news).
Therapeutic Candidates
Since APOE4 has been implicated in both gain- and loss-of-function effects, the benefits of reducing versus increasing ApoE4 levels have been subject to debate (Belloy et al., 2019). After evaluating multiple studies in humans (mostly of European and African ancestries) and animal models, the APOE4 NIA/ADSP Consortium working group concluded that the preferred therapeutic goal is to reduce ApoE4 levels (Vance et al., 2024).
Multiple approaches to achieve this goal are being examined, ranging from directly targeting the protein, to mitigating its downstream effects (see Serrano-Pozo et al., 2021; Yang et al., 2021; Raulin et al., 2022 for reviews). Direct strategies include reducing ApoE4 levels, enhancing the protein’s lipidation, and blocking its interactions with Aβ peptides or APP. For example, an antibody that preferentially binds to aggregated, poorly lipidated ApoE, a form often adopted by ApoE4, was reported to reduce amyloid pathology and improve cerebrovascular function in mice (Feb 2021 news; May 2019 conference news; Apr 2018 news).
Approaches to target downstream effects include blocking a proton leak channel to circumvent ApoE4-mediated stalling of early endosomes (July 2021 news), identifying drugs that normalize transcriptional signatures linked to ApoE4 (Oct 2021 news, although see Morales et al., 2024), boosting lipid efflux from glial cells (Nov 2023 news) and targeting downstream signaling cascades disrupted by ApoE4 (Dec 2021 news).
Also, other researchers are attempting to boost ApoE2/ApoE3 activity, either by using gene therapy to express the benign isoforms in APOE4 carriers (e.g., LX1001, Dec 2022 conference news, Jackson et al., 2024), or by designing small molecules to mold ApoE4 into a conformation that more closely resembles those of ApoE2/ApoE3 (e.g., Wang et al., 2018, June 2018 news, Nemergut et al., 2023, ALZ-801).
Of note, taking into account APOE4 carriership is proving important for the development and deployment of multiple AD therapies, even those that do not target ApoE. For example, recent studies have shown that the efficacy, side effects, and likely the optimal timing, of anti-Aβ immunotherapies are all shaped by the presence of APOE4 (Ossenkoppele and van der Flier, 2023; Garcia et al., 2024). Indeed, a genome-wide search for genetic risk factors associated with amyloid-related imaging abnormalities (ARIA)—an adverse event tied to these therapies—indicated APOE4 is the strongest risk factor for ARIA incidence (Loomis et al., 2024). The mechanisms underlying this risk are still unclear, but may involve reduced cerebrovascular integrity, increased CAA, and/or neuroinflammation and immune dysregulation (Foley and Wilcock, 2024).
Research Models
Multiple APOE4 research models have been developed, including rodent models and patient-derived iPSC lines (e.g., Nov 2022 news; Schmid et al., 2021; Raman et al., 2020). APOE4 knock-in mice, transgenic mice and rats, and mice carrying APOE4 together with AD-relevant mutations are available. In general, mice carrying human APOE4 appear to have only limited cognitive deficits, but are more vulnerable to neurodegenerative challenges, such as co-expression of familial AD mutations, than APOE3-carrying mice (Heuvelen et al., 2024).
A particularly interesting mouse model was engineered to allow a switch from expressing APOE4 to APOE2 via activation of Cre recombinase (Aug 2023 conference news). Another mouse line described in a preprint, LOAD2, models late-onset AD, including the human APOE4 gene, the TREM2 R47H variant (which in mice reduces TREM2 expression), and a humanized Aβ sequence in the APP gene (Jan 2024 news; Kotredes et al., 2024; Pandey et al., 2024). Also reported in a preprint, a 3D human brain model derived from APOE4 carrier iPSCs has been created (Stanton et al., 2023). With six brain cell types embedded in a 3D hydrogel, it is engineered to mimic immuno-glial-neurovascular interactions.
Nomenclature Notes
APOE was first studied at the protein level and observed to have isoforms that migrated to different positions upon isoelectric focusing. The most common isoform was named ApoE3, while isoforms with one additional positive charge were named ApoE4. Subsequent studies showed that, in most cases, these faster migrating species corresponded to C130R.
Table
APOE4-Associated AD Risk Across Groups of Different Ancestries*
Risk Allele | Allele Freq. AD | CTRL | N Cases | CTRL |
Association Results | Ancestry (Cohort) | Reference |
---|---|---|---|---|---|
E3/E4 | 0.43 | 0.21 | 16,963 | 17,058 |
OR=3.46a [CI=3.27-3.65] p<1.0×10−300 |
Non-Hispanic White (NIAGADS/ADSP, AMP-AD, dbGAP, LONI) | Belloy et al., 2023 |
E3/E4 | 21,852 total | OR=4.54a [CI=3.99-5.17] p=3.11×10−115 |
East Asianb |
Belloy et al., 2023 | |
E3/E4 | 0.42 | 0.27 | 2,011 | 5,134 | OR=2.18a [CI=1.90-2.49] p=9.82×10−30 | Non-Hispanic Black (NIAGADS/ADSP, AMP-AD, dbGAP, LONI) | Belloy et al., 2023 |
E3/E4 | 0.33 | 0.20 | 2,189 | 3,549 | OR=1.90a [CI=1.65-2.18] p=8.39×10−20 | Hispanic (NIAGADS/ADSP, AMP-AD, dbGAP, LONI) | Belloy et al., 2023 |
E4 | 0.26 (total) | 37,382 total |
OR=3.20 |
Non-Hispanic White (ADGC) | Rajabli et al., 2023c |
E4 | 0.24 (total) | 6,728 total |
OR=2.66 |
African American (ADGC) | Rajabli et al., 2023c |
E4 | 0.20 (total) | 8,899 total |
OR=2.26 |
Hispanic (ADGC) | Rajabli et al., 2023c |
E4 | 0.17 (total) | 3,232 total |
OR=4.94 |
East Asian (ADGC) | Rajabli et al., 2023c |
E3/E4 | 0.47 | 0.24 | 8,419 | 7,417 | OR=3.83a [CI=3.6-4.1] p=2.0×10−270 |
European (ADGC) |
Choi et al., 2019 |
E3/E4 | 0.40 | 0.16 | 2,302 | 17,096 | OR=4.98a [CI=4.4-5.6] p=2.6×10−152 |
East Asian (Korean-GARD and Japanese) |
Choi et al., 2019 |
E3/E4 | 0.44 | 0.28 | 1,523 | 3,462 | OR=2.49a [CI=2.2-2.9] p=1.3×10−35 |
African American (ADGC) |
Choi et al., 2019 |
E4/E4 | 0.086 |0.009 | 2,302 | 17,096 | OR=25.12a [CI=19.0-33.5] p=2.8×10-109 |
East Asian (Korean-GARD and Japanese) |
Choi et al., 2019 |
E4/E4 | 0.15 | 0.02 | 8,419 | 7,417 | OR=14.35a [CI=12.0-17.1] p=2.3×10−187 |
European (ADGC) |
Choi et al., 2019 |
E4/E4 | 0.14 |0.03 | 1,523 | 3,462 | OR=8.17a [CI=6.3-10.7] p=3.0×10−54 |
African American (ADGC) |
Choi et al., 2019 |
E4 | 0.31 | 0.18 | 4,230 | 3,109 | OR=2.40 [CI=2.21-2.61] p=1.04x10-95 |
Non-Hispanic White (ADSP) | Lee et al., 2023 |
E4 | 0.39 | 0.19 | 1,137 | 1,707 | OR=2.79 [CI=2.47-3.14] p=6.67x10-62 |
African American (ADSP) | Lee et al., 2023 |
E4 | 0.20 | 0.12 | 1,021 | 1,988 | OR=1.90 [CI=1.61-2.25] p=4.93x10-14 |
Hispanic (ADSP) | Lee et al., 2023 |
E3/E4 | N/A | 6,305 total |
OR=3.2a [CI=2.8-3.8] |
Caucasian | Farrer et al., 1997d |
E3/E4 | 0.38 | 0.32 | 235 | 240 | OR=1.1a [CI=0.7-1.8] |
African American | Farrer et al., 1997d |
E3/E4 | 0.31 | 0.18 | 261 | 267 | OR=2.2a [CI=1.3-3.4] |
Hispanic | Farrer et al., 1997d |
E3/E4 | 0.37 | 0.16 | 336 | 1,977 | OR=5.6a [CI=3.8-8.0] |
Japanese | Farrer et al., 1997d |
E4/E4 | N/A | 6,305 total |
OR=14.9a [CI=10.8-20.6] |
Caucasian | Farrer et al., 1997d |
E4/E4 | 0.12 | 0.02 | 235 | 240 | OR=5.7a [CI=2.3-14.2] |
African American | Farrer et al., 1997d |
E4/E4 | .03 |0.02 | 261 | 267 | OR=2.2a [CI=0.7-6.7] |
Hispanic | Farrer et al., 1997d |
E4/E4 | 0.09 | 0.0008 | 336 | 1,977 | OR=33.1a [CI=13.6-80.5] |
Japanese | Farrer et al., 1997d |
E4 | 0.32 (total) | 1,238 | 1,790 | HR=3.44 [CI=3.08-3.83] |
European (NIALOAD) |
Blue et al., 2019 |
E4 | 0.21 (total) | 1,329 | 1,738 | HR=1.98 [CI=1.80-2.19] |
Caribbean Hispanic (CU Hispanics) |
Blue et al., 2019 |
E4 | 0.68 | 0.28 | 1,582 | 540 | OR=5.22e [CI=4.21-6.46] p=9.3×10−52 |
Caucasian (ADC) |
Jun et al., 2010 |
E4 | 0.40 | 0.24 | 549 | 544 | OR=2.16e [CI=1.67-2.81] p=4.9×10−9 |
Caribbean Hispanic (Columbia U.) |
Jun et al., 2010 |
E4 | 0.43 | 0.27 | 180 |199 | OR=2.17e [CI=1.65-2.85] p=4.9×10−9 |
African American (MIRAGE) |
Jun et al., 2010 |
E4 | 0.03 | 0.01 | 73 | 80 | OR=2.87e [CI=0.54-15.26] p=0.217 |
Arab Wadi Ara | Jun et al., 2010 |
E4 | 0.28 | 0.17 | 308f | 710 | OR=2.49 [CI=0.83-7.47] |
Mexican | Huggins et al., 2023d |
E4 | 0.64 | 0.24 | 318f | 1,897 | OR=4.61 [CI=2.74-7.75] |
South American | Huggins et al., 2023d |
E4/E4 | 0.077 | 0.034 | 182 | 1,689 | HR=4.12e [CI=2.33-7.28] p<0.0001 |
African American | Hendrie et al., 2014 |
E4/E4 | 0.081 | 0.045 | 173 | 2,027 | HR=2.95e [CI=1.67-5.19] P=0.0002 |
African Yoruba | Hendrie et al., 2014 |
E4 | 0.44 | 0.30 | 182 | 1,689 | HR=2.31e [CI=1.70-3.14] P<0.0001 |
African American | Hendrie et al., 2014 |
E4 | 0.37 | 0.34 | 173 | 2,027 | HR=1.21e [CI=0.88-1.67] P=0.2362 |
African Yoruba | Hendrie et al., 2014 |
E4 | 0.378 (total) | 373 (total) |
OR=1.02e [CI=0.39-2.68] |
Black (Chicago) |
Evans et al., 2003 |
E4 | 0.312 (total) | 462 (total) |
OR=2.73e [CI=1.40-5.32] |
White (Chicago) |
Evans et al., 2003 |
E4 | 0.17 | 0.13 | 23 | 214 | RR=2.5a [CI=1.1-6.4] |
Whites (Medicare, New York City) |
Tang et al., 1998 |
E4 | 0.19 | 0.21 | 53 | 128 | RR=1.0a [CI=0.6-1.6] |
African American (Medicare, New York City) |
Tang et al., 1998 |
E4 | 0.15 | 0.14 | 145 | 516 | RR=1.1a [CI=0.7-1.6] |
Hispanic (Medicare, New York City) |
Tang et al., 1998 |
E4 heterozygote | 0.41 | 0.18 | 59 |112 | RR=2.9a [CI=1.7-5.1] |
Caucasian (New York) |
Tang et al., 1996 |
E4 heterozygote | 0.29 | 0.17 | 140 |219 | RR=1.6a [CI=1.1-2.3] |
Hispanic (New York) |
Tang et al., 1996 |
E4 heterozygote | 0.26 | 0.38 | 106 | 154 | RR=0.6a [CI=0.4-0.9] |
African American (New York) |
Tang et al., 1996 |
E4/E4 | 0.068 | 0 | 59 | 112 | RR=7.3a [CI=2.5-21.6] |
Caucasian (New York) |
Tang et al., 1996 |
E4/E4 | 0.043 | 0.014 | 140 |219 | RR=2.5a [CI=1.1-5.7] |
Hispanic (New York) |
Tang et al., 1996 |
E4/E4 | 0.094 | 0.013 | 106 | 154 | RR=3.0a [CI=1.5-5.9] |
African American (New York) |
Tang et al., 1996 |
E3/E4 | 0.37 | 0.12 | 43 | 59 | OR=4.4a [CI=1.6-12.2] p<0.01 |
White | Maestre et al., 1995 |
E3/E4 | 0.37 | 0.40 | 41 | 57 | OR=1.6a [CI=0.6-4.2] p>0.01 |
African American | Maestre et al., 1995 |
E3/E4 | 0.30 | 0.20 | 61 | 90 | OR=2.0a [CI=0.9-4.5] p>0.01 |
Hispanic | Maestre et al., 1995 |
E4/E4 | 0.07 | 0.02 | 43 | 59 | OR=5.7a [CI=0.6-58.0] p>0.01 |
White | Maestre et al., 1995 |
E4/E4 | 0.12 | 0.04 | 41 | 57 | OR=8.2a [CI=1.3-51.0] p<0.01 |
African American | Maestre et al., 1995 |
E4/E4 | 61 | 90 | OR=4.2a [CI=0.7-24] p>0.01 |
Hispanic | Maestre et al., 1995 | |
E4 | 0.34 | 0.12 | 271e | 419 | p<0.05e | Caucasian (Mayo Clinic) |
Henderson et al., 2002 |
E4 | 0.33 | 0.13 | 9e | 60 | p<0.05e | < ½ Amerindian Choctaw | Henderson et al., 2002 |
E4 | 0.13 | 0.08 | 8f | 54 | N/A | > ½ Amerindian Choctaw | Henderson et al., 2002 |
*Only data from reports comparing AD risk among groups of different ancestries using the same analyses tools, in the same study, were included.
aReference E3/E3.
bMeta-analysis of two meta-analyses (Farrer et al., 1997, Choi et al., 2019).
cData from MedRxiv preprint.
dMeta-analysis of multiple studies.
eReference: E4 non-carriers.
fDiagnosed with dementia/ADRD, not specifically AD.
OR=odds ratio, HR=hazard ratio, RR=risk ratio.
Statistically significant associations (as assessed by the authors) are in bold.
This table is meant to convey the range of results reported in the literature. As specific analyses, including co-variates, differ among studies, this information is not intended to be used for quantitative comparisons, and readers are encouraged to refer to the original papers. Thresholds for statistical significance were defined by the authors of each study. (Significant results are in bold.) Note that data from some cohorts may have contributed to multiple studies, so each row does not necessarily represent an independent dataset. While every effort was made to be accurate, readers should confirm any values that are critical for their applications.
Last Updated: 19 Sep 2024
References
News Citations
- Dysregulated Lipid Metabolism Comes to the Fore at AD/PD
- ApoE4 Hastens Alzheimer’s Disease in Down’s Syndrome
- Similar Risk Factors Found for Young- and Late-Onset Dementia
- Forget Typical Alzheimer's: AI Finds Four Types.
- Even Without Amyloid, ApoE4 Weakens Blood-Brain Barrier, Cognition
- Shooting Themselves in the Foot? Microglia Block “Good” State with ApoE4
- Among Icelanders, Blood Proteome Predicts Dementia, Parses Role of ApoE4
- CSF Proteomics Hints at How ApoE4 Promotes AD, and How a Drug Hinders It
- New Look at Sex and ApoE4 Puts Women at Risk Earlier than Men
- Study Finds Sex Influences CSF Tau Levels in ApoE4 Carriers
- Is a Woman’s Brain More Susceptible to Tau Pathology?
- ApoE4 and Tau in Alzheimer’s: Worse Than We Thought? Especially in Women
- Receptor Decoy Raises Risk of Alzheimer’s—But Only in Women
- More Data on Herpes and Alzheimer’s Disease
- Healthy Lifestyle Hedges Dementia Risk, but Not if Genetic Risk Runs High
- Young ApoE4 Carriers Wander Off the ‘Grid’ — Early Predictor of Alzheimer’s?
- Young ApoE4 Carriers Have Reversed AD Proteomic Signature
- In People Who Defy ApoE, New Alzheimer’s Risk Genes Found
- Up, and Down—Haptoglobin Moves APOE4 Risk in Mysterious Ways
- Two ApoE Mutations Decrease Risk for Alzheimer's Disease
- Klotho Variant Cuts ApoE4’s Alzheimer Risk by a Third
- Klotho VS Variant Preserves Memory by Preventing Tangles
- Part with PILRA, Power Up Microglia?
- The Mutation You Want: It Protects the Brain, Extends Life
- In Oldest Old, Rare Longevity Variants Suppress Common Pathogenic Ones
- Does a Rare Fibronectin Variant Protect Against APOE4?
- First Genome-Wide Association Study of Dementia with Lewy Bodies
- Brain Volume, Myelination Different in Infants Carrying ApoE4
- First Whole-Genome Sequencing of PSP Nets Six New Risk Loci
- Not All Bad? APOE4 Sharpens Memory in Older People
- APOE Tied to Increased Susceptibility to SARS-CoV-2
- Do Lipids Lubricate ApoE's Part in Alzheimer Mechanisms?
- Could Juicing Up Trafficking Abolish ApoE4’s Alzheimer’s Risk?
- On The Docket at AD/PD: The Many Crimes of ApoE4
- ApoE Has Hand in Alzheimer’s Beyond Aβ, Beyond the Brain
- In Human Neurons, ApoE4 Promotes Aβ Production and Tau Phosphorylation
- ApoE Risk Explained? Isoform-Dependent Boost in APP Expression Uncovered
- ApoE4 Makes All Things Tau Worse, From Beginning to End
- Squelching ApoE in Astrocytes of Tau-Ravaged Mice Dampens Degeneration
- Sans TREM2, ApoE4 Drives Microgliosis and Atrophy in Tauopathy Model
- Meddling Microbiome Worsens Tauopathy and Neurodegeneration
- Droplets of Unsaturated Fats Burden Human ApoE4 Astrocytes
- ApoE4 Glia Bungle Lipid Processing, Mess with the Matrisome
- At AD/PD Conference, New Alzheimer’s Genes Reinforce Known Pathways
- Does ApoE in Neurons Drive Selective Vulnerability in Alzheimer’s?
- In Tauopathy, ApoE Destroys Neurons Via Microglia
- Human Blood-Brain Barrier Model Blames Pericytes for CAA
- Alzheimer's Risk Genes Nip at Hippocampus Throughout Life
- Alzheimer’s Disease-Related Proteins Needed for Neurogenesis
- In Astrocytes, ApoE4 Bungles Endocytosis, PICALM Picks Up the Slack
- Toxic α-Synuclein: Egged on by ApoE4, Thwarted by ApoE2?
- In Lipoparticles, ApoE Double Belt Keeps the Fat In
- Lipid-Laden, Sluggish Microglia? Blame Aβ.
- Do APOE4’s Lipid Shenanigans Trigger Tauopathy?
- In Amyloid and Tangle Models, APOE4 Paralyzes Microglia
- Among AD Mutations, Only ApoE4 Seems to Hobble Microglia
- Cracking the Cholesterol-AD Code: Metabolites and Cell Type
- Secreted by Neurons, ApoE4 Makes Tangles and Degeneration Worse
- ApoE4 Makes Blood Vessels Leak, Could Kick Off Brain Damage
- Survey of Tau Partners Highlights Synaptic, Mitochondrial Roles
- Macrophages Blamed for Vascular Trouble in ApoE4 Carriers
- Epigenetic Shenanigans—In AD, Chromatin Opens Up in Blood Immune Cells
- Would ApoE Make a Better Therapeutic Target Than Aβ?
- Antibodies Against Microglial Receptors TREM2 and CD33 Head to Trials
- Human ApoE Antibody Nips Mouse Amyloid in the Bud
- Can an Old Diuretic Drug Disarm APOE4, Prevent Alzheimer’s?
- In Small Trial, Gene Therapy Spurs ApoE2 Production
- Cornucopia: LOADs of New Mouse Models Available
- Meet the Switching Mice: They Flip Their Glia APOE4 to APOE2
Mutations Citations
Therapeutics Citations
Paper Citations
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No Available Further Reading
Protein Diagram
Primary Papers
- Weisgraber KH, Rall SC Jr, Mahley RW. Human E apoprotein heterogeneity. Cysteine-arginine interchanges in the amino acid sequence of the apo-E isoforms. J Biol Chem. 1981 Sep 10;256(17):9077-83. PubMed.
- Zannis VI, Breslow JL. Human very low density lipoprotein apolipoprotein E isoprotein polymorphism is explained by genetic variation and posttranslational modification. Biochemistry. 1981 Feb 17;20(4):1033-41. PubMed.
Other mutations at this position
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