Cited by 4,268Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Apolipoprotein E: high-avidity binding to beta-amyloid and increased frequency of type 4 allele in late-onset familial Alzheimer disease.

Open access
Strittmatter, W J, Saunders, A M, Schmechel, D, Pericak-Vance, M, Enghild, J, Salvesen, G S, Roses, A D·1993·Proceedings of the National Academy of Sciences

Abstract

Apolipoprotein E is immunochemically localized to the senile plaques, vascular amyloid, and neurofibrillary tangles of Alzheimer disease. In vitro, apolipoprotein E in cerebrospinal fluid binds to synthetic beta A4 peptide (the primary constituent of the senile plaque) with high avidity. Amino acids 12-28 of the beta A4 peptide are required. The gene for apolipoprotein E is located on chromosome 19q13.2, within the region previously associated with linkage of late-onset familial Alzheimer disease. Analysis of apolipoprotein E alleles in Alzheimer disease and controls demonstrated that there was a highly significant association of apolipoprotein E type 4 allele (APOE-epsilon 4) and late-onset familial Alzheimer disease. The allele frequency of the APOE-epsilon 4 in 30 random affected patients, each from a different Alzheimer disease family, was 0.50 +/- 0.06; the allele frequency of APOE-epsilon 4 in 91 age-matched unrelated controls was 0.16 +/- 0.03 (Z = 2.44, P = 0.014). A functional role of the apolipoprotein E-E4 isoform in the pathogenesis of late-onset familial Alzheimer disease is suggested.

Integrity signals

Registry

Crossref · 10.1073/pnas.90.5.1977

Cites

25 of 25 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

0 of 23 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    In 30 randomly chosen affected individuals, one from each of 30 Alzheimer disease families, the APOE-e4 allele frequency was 0.50 ± 0.06.

    “The alele frequency of the APOE-e4 in 30 random affected patients, each from a different Azheimer disease family, was 0.50 t 0.06;”
    • Also stated in: § MATERIALS AND METHODS · plain
      “the frequency of the APOE-e4 allele in the 30 patients (0.50 ± 0.06)”
    Quote in the paperSubstantial claim
  • Findingcitation

    The APOE-e4 allele frequency in the study's control group was similar to that in a larger population study.

    “The allele frequency of APOE-E4 found in our control population was similar to that found in a larger population study (20).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [20] 20. Menzel, J., Kladetzky, K. G. & Assmann, G. (1983) Arterio- sclerosis 4, 310-315.

      Not checked in the free run.

  • Findingown data

    The APOE-e4 allele frequency difference between the 30 patients and 91 controls was statistically significant (Z=2.44, P=0.014).

    “the aUlele frequency of APOE-e4 in 91 age-matched unrelated controls was 0.16 ± 0.03 (Z = 2.44, P = 0.014).”
    • Also stated in: § MATERIALS AND METHODS · plain
      “differed significantly from the frequency found in the 91 controls (0.16 ± 0.03; Z = 2.44, P = 0.014).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The 91 unrelated CEPH grandparents used as controls are genetically comparable to the familial Alzheimer disease cases, so the allele frequency difference is not due to population stratification.
    • Rests on an assumption: The two early-onset families in the sample do not materially affect the association between APOE-e4 and late-onset familial Alzheimer disease.
  • Findingown data

    In 91 age-matched unrelated controls, the APOE-e4 allele frequency was 0.16 ± 0.03.

    “the aUlele frequency of APOE-e4 in 91 age-matched unrelated controls was 0.16 ± 0.03 (Z = 2.44, P = 0.014).”
    • Also stated in: § MATERIALS AND METHODS · plain
      “the frequency found in the 91 controls (0.16 ± 0.03; Z = 2.44, P = 0.014).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The 91 unrelated CEPH grandparents used as controls are genetically comparable to the familial Alzheimer disease cases, so the allele frequency difference is not due to population stratification.
  • Findingown data

    ApoE in CSF stayed bound to immobilized beta-A4-(1-40), beta-A4-(1-28), and beta-A4-(12-28) after PBS plus 5% SDS washing.

    “ApoE in CSF remained bound to immobilized (A4-(1-40), fA4-(1-28), andj'A4-(12-28) after incubation and washing with phosphate-buffer saline plus 5% SDS.”
    Quote in the paperSubstantial claim
  • May combine two claims. 12
  • Classified as probably not a substantial claim. 19
  • May combine two claims.

    Findingown data

    ApoE protein is present in senile plaques, vascular amyloid, and neurofibrillary tangles in Alzheimer disease brain tissue.

    “Apolipoprotein E is immunochemically local- ized to the senile plaques, vascular amyloid, and neuroflbrillary tangles of Alzheimer diwase.”
    • Also stated in: § MATERIALS AND METHODS · plain
      “Antiserum to ApoE stained amyloid plaques in tissues from Alzheimer disease patients and an aged lemur (Fig. 4 B and E).”
    • Also stated in: § MATERIALS AND METHODS · plain
      “ApoE is found in senile plaques, in neurofibrillary tangles, and-at the sites of congophilic angiopathy of Alzhei- mer disease”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Anti-ApoE antiserum stained amyloid plaques in Alzheimer disease patient tissue and in an aged lemur.

    “Antiserum to ApoE stained amyloid plaques in tissues from Alzheimer disease patients and an aged lemur (Fig. 4 B and E).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Antithrombin did not bind beta-A4 peptide, but a contaminating protein did.

    “Using the in vitro assay described here, we found that antithrombin, a related protein, did not bind the fA4 peptide but a contaminant protein did.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Guanidine hydrochloride failed to elute ApoE from beta-A4-(12-28) peptide but eluted nearly all ApoE from the even-hydropathy control peptide.

    “Guanidine hydrochloride did not elute ApoE from the 3A4-(12-28) peptide but did elute virtually all the ApoE bound to the even-hydropathy control peptide (Fig. 1 Lower, lanes 4).”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    ApoE has three major isoforms identified by amino acid sequencing: E3, E4, and E2.

    “There are three major isoforms of ApoE identified by amino acid sequencing, designated ApoE-E3, ApoE-E4, and ApoE-E2.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [1] 1. Mahley, R. W. (1988) Science 240, 622-628.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    APOE mRNA is increased severalfold in Alzheimer disease brain and in scrapie-infected animal brain.

    “APOE mRNA is increased severalfold in the brain of patients with Alzheimer disease and in the brain of animals with scrapie (10), a transmissible disease in animals that is similar to Creutzfeld-Jakob disease in humans and also exhibits prion protein plaques (9).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [10] 10. Diedrich, J. F., Minnigan, H., Carp, R. I., Whitaker, J. N., Race, R., Frey, W., II, & Haase, A. T. (1991) J. Virol. 65, 4759-4768.

      Not checked in the free run.

    • cites [9] 9. Prusiner, S. B., Hsiao, K. K., Bredesen, D. E. & DeArmond, S. J. (1989) in Handbook of Clinical Neurology, ed.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    ApoE is also bound in amyloid plaques of Creutzfeld-Jakob disease.

    “ApoE is also bound in the amyloid plaques of another dementing degenerative disease, Creutzfeld-Jakob disease (8).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [8] 8. Namba, Y., Tomonaga, M., Kawasaki, H., Otomo, E. & Ikeda, K. (1991) Brain Res. 541, 163-166.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationcitation

    Given that beta-A4 amyloid is a normal extracellular product in many cell types, specific ApoE-beta-A4 interactions could define additional mechanisms of Alzheimer disease pathogenesis.

    “With the recent appreciation that 3A4 amyloid is a normal extracellular product in many cell types (26), the discovery of specific interactions between ApoE and ,SA4 could define additional mechanisms of Alz- heimer disease pathogenesis.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [26] 26. Haass, C., Schlossmacher, M. G., Hung, A. Y., Vigo-Pelfey, C., Mellon, A., Ostaszewski, B. L., Lieberburg, I., Koo, E. H., Schenk, D., Teplow, D. B. & Selkoe, D. J. (1992) Science 359, 322-325.

      Not checked in the free run.

    • Rests on an assumption: In vitro binding of ApoE to synthetic beta-A4 peptides reflects a biologically relevant interaction that occurs in vivo.
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    ApoE-E4 has arginine at residue 112, while E3 has cysteine.

    “ApoE-E4 contains an arginine at residue 112, whereas E3 has a cysteine.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [1] 1. Mahley, R. W. (1988) Science 240, 622-628.

      Not checked in the free run.

  • May combine two claims.

    Study design and conductown data

    APOE-e4 allele frequency was similar across all 83 tested Alzheimer disease patients in the 30 families, supporting that the 30-patient random sample represented the families' e4 frequency.

    “APOE-e4 frequency was similar for all 83 tested Alzheimer disease patients in the 30 families, indicating that the random sample used in the association analysis accurately represented the e4 allele frequency in the families (Table 1).”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Interpretationreasoning

    The APOE-e4 association with familial Alzheimer disease implies that another intragenic polymorphism on an APOE-e4 background could confer susceptibility to Alzheimer disease.

    “Second, there could also be another intragenic polymorphism on an APOE-e4 background that confers susceptibility to Alzheimer disease.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Premisecitation

    The APOE gene maps to chromosome 19q13.2.

    “The gene for apolipo- protein E is located on chromosome 19q13.2,within the region previously associated with linkage of late-onset familial Alz- heimer diseas.”
    • Also stated in: § MATERIALS AND METHODS · plain
      “APOE is on the proximal long arm of chromosome 19, at 19q13.2 (1).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [1] 1. Mahley, R. W. (1988) Science 240, 622-628.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Creutzfeld-Jakob disease amyloid deposits contain prion protein, not the beta-A4 peptide found in Alzheimer disease.

    “The amyloid deposits in Creutzfeld-Jakob disease contain the prion protein, not the 3A4 peptide in Alzheimer disease (9).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [9] 9. Prusiner, S. B., Hsiao, K. K., Bredesen, D. E. & DeArmond, S. J. (1989) in Handbook of Clinical Neurology, ed.

      Not checked in the free run.

  • Classified as probably not a substantial claim. May combine two claims.

    Interpretationreasoning

    A function involving binding, transport, and targeting of beta-A4 or other peptides may link the diagnostic lesions and genetic susceptibility, suggesting a functional role for ApoE isoforms in Alzheimer disease pathogenesis.

    “A function involving the binding, transport, and targeting of 83A4 (or other peptides) may link the diagnostic lesions and genetic susceptibility, suggesting a functional role for ApoE isoforms in the mechanism of Alzheimer disease pathogenesis.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: In vitro binding of ApoE to synthetic beta-A4 peptides reflects a biologically relevant interaction that occurs in vivo.
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Interpretationcitation

    Intraneuronal ApoE staining may represent neurofibrillary tangles or early neuronal degeneration.

    “In addition, intraneuronal staining was observed, which may represent staining of neurofibrillary tangles (8) or early degeneration of neurons (Fig. 4 D-F).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [8] 8. Namba, Y., Tomonaga, M., Kawasaki, H., Otomo, E. & Ikeda, K. (1991) Brain Res. 541, 163-166.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    PCR-based restriction isotyping of APOE alleles has been developed for population studies.

    “PCR-based restriction isotyping ofAPOE alleles has been developed for use in population'studies (13, 14).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [13] 13. Wenham, P. R., Price, W. H. & Blundell, G. (1991) Lancet 337, 1158-1159.

      Not checked in the free run.

    • cites [14] 14. Hixson, J. E. & Vernier, D. T. (1990)J. LipidRes. 31, 545-548.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Brain contains large amounts of APOE mRNA, second only to liver.

    “Brain contains large quantities ofAPOE mRNA, second only to the liver (5).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [5] 5. Elshourbagy, N. A., Liao, W. S., Mahley, R. W. & Taylor, J. M. (1985) Proc. Natl. Acad. Sci. USA 82, 203-207.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Several proteins, including ApoE, APP, alpha1-antichymotrypsin, complement factors, and immunoglobulins, are associated with beta-A4.

    “Several additional proteins are asso- ciated with 13A4, including ApoE, APP, a1-antichymotrypsin, complement factors, and immunoglobulins (12).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [12] 12. Beyreuther, K. & Masters, C. L. (1991) Brain Pathol. 1, 241-251.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    ApoE-E2 has cysteine at residue 158, while E3 has arginine.

    “ApoE-E2 contains a cysteine at residue 158, whereas E3 has an arginine.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [1] 1. Mahley, R. W. (1988) Science 240, 622-628.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Interpretationown data

    The association of APOE-e4 with familial Alzheimer disease is consistent with prior analyses.

    “The association of the APOE-e4 allele with familial Alzheimer disease was significantly increased compared to the population controls and is consistent with prior analyses.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    After optic nerve crush in the central nervous system, ApoE binds to degenerating optic tracts and to retino-recipient layers of the lateral geniculate nucleus and superior colliculus.

    “After crush injury to the central nervous system optic nerve, ApoE is bound to the degenerating optic tracts and to the retino-recipient layers of the lateral geniculate nucleus and the superior colliculus (7).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [7] 7. Snipes, G. J., McGuire, C. B., Norden, J. J. & Freeman, J. A. (1986) Proc. Nat!. Acad. Sci. USA 83, 1130-1134.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    ApoE is produced and secreted in the central nervous system by astrocytes.

    “ApoE is pro- duced and secreted in the central nervous systram by astro- cytes (2-4).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites [2] 2. Ignatius, M. J., Gebicke-Harter, P. J., Skene, J. H. P., Schill- ing, J. W., Weisgraber, K. H., Mahley, R. W. & Shooter, E. M. (1986) Proc. Natl. Acad. Sci. USA 83, 1125-1129.

      Not checked in the free run.

    • cites [3] 3. Boyles, J., Pitas, R. E., Wilson, E., Mahley, R. W. & Taylor, J. M. (1985) J. Clin. Invest. 76, 1501-1513.

      Not checked in the free run.

    • cites [4] 4. Pitas, R. E., Boyles, J. K., Lee, S. H., Foss, D. & Mahley, R. W. (1987) Biochim. Biophys. Acta 917, 148-161.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    In the peripheral nervous system, ApoE synthesis increases 250- to 350-fold within 3 weeks after sciatic nerve crush, and ApoE makes up 5% of total soluble extracellular protein.

    “In the peripheral nervous system, the synthesis of ApoE increases 250-to 350-fold within 3 weeks of sciatic nerve crush, and ApoE constitutes 5% of the total soluble extracellular protein (2, 6).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [2] 2. Ignatius, M. J., Gebicke-Harter, P. J., Skene, J. H. P., Schill- ing, J. W., Weisgraber, K. H., Mahley, R. W. & Shooter, E. M. (1986) Proc. Natl. Acad. Sci. USA 83, 1125-1129.

      Not checked in the free run.

    • cites [6] 6. Boyles, J. K., Zoellner, C. D., Anderson, L. J., Kosik, L. M., Pitas, R. E., Weisgraber, K. H., Hui, D. Y., Mahley, R. W., Gebicke-Haerter, P. J., Ignatius, M. J. & Shooter, E. M. (1989) J. Clin. Invest. 83, 1015-1031.

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    These proteins and beta-A4 amyloid peptide are found around cerebral vessels in Alzheimer disease, producing congophilic angiopathy.

    “These pro- teins, as well as the ,BA4 amyloid peptide, are also found surrounding cerebral vessels in Alzheimer disease, producing the”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [12] 12. Beyreuther, K. & Masters, C. L. (1991) Brain Pathol. 1, 241-251.

      Not checked in the free run.

24 of 24
  • The paper relies on this without support.

    In vitro binding of ApoE to synthetic beta-A4 peptides reflects a biologically relevant interaction that occurs in vivo.

    “Using this technique, we have demonstrated high-avidity binding of ApoE in CSF to ,BA4 peptide.”
  • The paper relies on this without support.

    The 91 unrelated CEPH grandparents used as controls are genetically comparable to the familial Alzheimer disease cases, so the allele frequency difference is not due to population stratification.

    “Controls used in the study were 91 unrelated grandparents from the Centre d'Etude du Polymorphisme Humain (16).”
  • The paper relies on this without support.

    The two early-onset families in the sample do not materially affect the association between APOE-e4 and late-onset familial Alzheimer disease.

    “In 28 of the families the disease was of the late-onset type (mean age of onset >60 years of age), and in 2 of the families, early onset (mean age of onset < 60 years of age).”
  • The paper relies on this without support.

    Localization of ApoE to Alzheimer disease lesions indicates a functional pathogenetic role rather than a secondary or incidental association.

    “The ldcalization of ApoE to the defining pathological lesions of Alzheimer disease suggests a functional pathogenetic role for ApoE.”
  • The paper relies on this without support.

    The synthetic beta-A4 peptide fragments used in the binding assay reproduce the relevant structural features of native beta-A4 in senile plaques.

    “Preparation of Immobilized Peptides.fA4 peptides (Bachem) and other peptides were covalently immobilized on Immobilon AV affmity membrane (Millipore).”
5 of 5

Claims other papers make about this one

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

  • Common APOE variants affect Alzheimer's disease risk: APOE4 carries high risk, APOE3 is viewed as neutral, and APOE2 is relatively protective.

    “Common variants of the apolipoprotein E gene (APOE) influence the risk of Alzheimer’s disease: APOE4 is linked to high risk, APOE3 is considered to confer a neutral risk, and APOE2 is associated with relative protection.2–5”

    From <i>APOE3</i> Christchurch Heterozygosity and Autosomal Dominant Alzheimer’s Disease (2024) · cites this paper as [2]

    The allele-association passage reports that APOE-e4 was significantly more frequent in patients from families with Alzheimer’s disease than in controls, supporting its link to elevated risk in that setting. Table 1 also lists lower E2 frequency in patients than controls, but the paper does not establish that E2 is protective or characterize E3 as neutral. Its findings concern primarily late-onset familial Alzheimer’s disease, not Alzheimer’s disease generally. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • APOE4 is the strongest genetic risk factor for Alzheimer's disease.

    “APOE4 is the strongest genetic risk factor for Alzheimer’s disease (AD)1–3.”

    From APOE4 impairs myelination via cholesterol dysregulation in oligodendrocytes (2022) · cites this paper as [3]

    The paper reports a significant association between APOE-e4 and late-onset familial Alzheimer’s disease: its allele frequency was 0.50 in affected patients versus 0.16 in controls. It does not compare APOE4 with other genetic risk factors to establish that it is the strongest, or establish the claim for Alzheimer’s disease generally. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • APOE ε4 is the strongest genetic risk factor for the most common form of late-onset Alzheimer's disease.

    “Apolipoprotein E ε4 (APOE ε4) is the strongest genetic risk factor for Alzheimer’s disease (AD).”

    From Haploinsufficiency of Human APOE Reduces Amyloid Deposition in a Mouse Model of Amyloid-β Amyloidosis (2011) · cites this paper as Strittmatter et al., 1993

    The allele-association passage (Materials and Methods; page not supplied) reports significantly higher APOE ε4 frequency in patients from late-onset familial Alzheimer’s disease families than in controls. The paper does not establish that ε4 is the strongest genetic risk factor relative to other factors, and it says a separate report will address sporadic Alzheimer’s disease. It therefore supports an association in the studied families, not the broader claim as stated. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • 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 [8]

    The allele-association passage (labeled Materials and Methods; page not provided) reports a significantly higher APOE-e4 frequency in familial Alzheimer disease patients than in controls, supporting its importance as a genetic risk factor. The paper does not compare APOE-e4 with other genetic risk factors to establish the citing sentence’s claim that it is the strongest, and its findings concern predominantly late-onset familial disease rather than all late-onset Alzheimer’s disease. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • 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 [8]

    The allele-association passage reports a significantly higher APOE-e4 frequency in people with familial Alzheimer disease than in controls, supporting the genetic-risk portion of the citing sentence. It does not show that APOE4 accelerates disease progression in humans or mouse models; searches for progression and mouse models found no such result. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

Statistics recomputed

Every reported test result, recomputed from its test statistic and degrees of freedom. A result shows as not adding up only once an independent check has confirmed it.

  • Consistentz = 2.44reported p = .014 · recomputed p = .015

    “(Z = 2.44, p = .014”

  • Consistentz = 2.44reported p = .014 · recomputed p = .015

    “Z = 2.44, p = .014”

2 of 2

Self-check

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

Self-check results appear here once an independent check has confirmed them.

Cites

Flagged first, then by citations

1 of the 26 references couldn’t be matched to a known paper.

Research works printed but not linked: 4

  1. [2]2. Ignatius, M. J., Gebicke-Harter, P. J., Skene, J. H. P., Schill- ing, J. W., Weisgraber, K. H., Mahley, R. W. & Shooter, E. M. (1986) Proc. Natl. Acad. Sci. USA 83, 1125-1129.
  2. [5]5. Elshourbagy, N. A., Liao, W. S., Mahley, R. W. & Taylor, J. M. (1985) Proc. Natl. Acad. Sci. USA 82, 203-207.
  3. [7]7. Snipes, G. J., McGuire, C. B., Norden, J. J. & Freeman, J. A. (1986) Proc. Nat!. Acad. Sci. USA 83, 1130-1134.
  4. [22]22. Roses, A. D., Pericak-Vance, M. A., Saunders, A. M., Schmechel, D., Goldgaber, D. & Strittmatter, W. (1993) Epi- lepsia, in press.

Cited by

Sorted by citations

Authors
Strittmatter, W. J., Saunders, A. M., Schmechel, D., Pericak-Vance, M., Enghild, J., Salvesen, G. S., & Roses, A. D.
Affiliations
  • Duke University (US)
  • Department of Medicine (Neurology), Joseph and Kathleen Bryan Alzheimer's Disease Research Center, Duke University Medical Center, Durham, NC 27710.
Venue
Proceedings of the National Academy of Sciences
Published
1993-03
Volume
90
Issue
5
Pages
1977-1981
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2021181758
Cited by
4,268
References
26
Citations by year
2026: 67 · 2025: 107 · 2024: 97 · 2023: 108 · 2022: 99 · 2021: 106 · 2020: 116 · 2019: 111 · 2018: 117 · 2017: 104 · 2016: 121 · 2015: 140 · 2014: 123 · 2013: 112 · 2012: 134
FWCI
125.11
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r35ag007922-07)
  • National Institute on Aging (5P50 AG-O5128, P50AG005128, 5R35 AG-O7922)
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 › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
apolipoprotein E, APOE ε4, amyloid-beta, amyloid plaques, amyloid binding, allele frequency, genetic association, Alzheimer disease pathogenesis
MeSH terms
Alleles, Alzheimer Disease, Amino Acid Sequence, Animals, Apolipoproteins E, Brain, Gene Frequency, Humans, Lemur, Molecular Sequence Data, Peptides, Protein Binding, Solubility, Amyloid beta-Peptides

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

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-01.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-01.

Statistics and arithmetic are recomputed, not judged.

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

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

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