Cited by 62Alzheimer's disease research and treatmentsDown syndrome and intellectual disability researchDementia and Cognitive Impairment Research

Impact of increased APP gene dose in Down syndrome and the Dp16 mouse model

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Sawa, Mariko, Overk, Cassia, Becker, Ann, Derse, Dominique, Albay, Ricardo, Weldy, Kim, Salehi, Ahmad, Beach, Thomas G. +4 more·2022·Alzheimer's & Dementia

Abstract

Introduction: People with Down syndrome (DS) are predisposed to Alzheimer's disease (AD). The amyloid hypothesis informs studies of AD. In AD‐DS, but not sporadic AD, increased APP copy number is necessary, defining the APP gene dose hypothesis. Which amyloid precursor protein (APP) products contribute needs to be determined. Methods: Brain levels of full‐length protein (fl‐hAPP), C‐terminal fragments (hCTFs), and amyloid beta (Aβ) peptides were measured in DS, AD‐DS, non‐demented controls (ND), and sporadic AD cases. The APP gene‐dose hypothesis was evaluated in the Dp16 model. Results: DS and AD‐DS differed from ND and AD for all APP products. In AD‐DS, Aβ42 and Aβ40 levels exceeded AD. APP products were increased in the Dp16 model; increased APP gene dose was necessary for loss of vulnerable neurons, tau pathology, and activation of astrocytes and microglia. Discussion: Increases in APP products other than Aβ distinguished AD‐DS from AD. Deciphering AD‐DS pathogenesis necessitates deciphering which APP products contribute and how.

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Crossref · 10.1002/alz.12463

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  • Previous reports have shown increased abundance of APP, S100B, and SYNJ1 in the frontal cortex and CSTB in the temporal cortex of people with DSAD.

    “These findings were consistent with previous reports of increased abundance of APP (amyloid precursor protein), S100B (S100 calcium-binding protein B), and SYNJ1 (synaptojanin-1) in the frontal cortex and CSTB (cystatin-B) in the temporal cortex of people with DSAD [45, 58, 71].”

    From Apolipoprotein E abundance is elevated in the brains of individuals with Down syndrome–Alzheimer’s disease (2025) · cites this paper as [58]

    The Preliminary Findings (page unavailable) report increased full-length APP in frozen frontal-cortex samples from people with AD-DS compared with non-demented controls. The cited paper does not report the claimed increases in S100B or SYNJ1 in frontal cortex or CSTB in temporal cortex. (LLM, conf=0.86)

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  • In trisomy 21 (Down syndrome), the additional copy of chromosome 21 leads to APP gene overexpression, causing excessive Aβ accumulation and near-universal development of amyloid plaques and Alzheimer-type dementia by the fifth decade of life.

    “Interestingly, in trisomy 21 (Down syndrome), the additional copy of chromosome 21 leads to APP gene overexpression, causing excessive Aβ accumulation and near-universal development of amyloid plaques and Alzheimer-type dementia by the fifth decade of life [150, 151].”

    From Toward a Unified Framework in Molecular Neurobiology of Alzheimer’s Disease: Revisiting the Pathophysiological Hypotheses (2026) · cites this paper as [151]

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  • APP abundance was increased in the DSAD frontal cortex.

    “Consistent with our proteomic analysis and a previous report [58], we found that APP abundance was increased in the DSAD frontal cortex (Fig. 4d, e).”
  • The increased APP-CTF-α in DSAD is likely the result of the additional copy of APP in individuals with DS.

    “This is likely the result of the additional copy of APP in individuals with DS and is consistent with a previous report [58].”
  • Raised APP abundance in the DSAD cases is driven by the additional copy of APP on Hsa21.

    “Importantly here, we know that raised APP abundance in our DSAD cases is driven by the additional copy of APP on Hsa21, as indicated by both human-genetics studies and preclinical modelling [12, 54, 58].”

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Research works printed but not linked: 3

  1. [44]Mori C, Spooner ET, Wisniewsk KE, Wisniewski TM, Yamaguch H, Saido TC, Intraneuronal Abeta42 accumulation in Down syndrome brain. Amyloid. 2002; 9: 88– 102. 12440481
  2. [69]Janelidze S, Zetterberg H, Mattsson N, Palmqvist S, Vanderstichele H, Lindberg O, CSF Abeta42/Abeta40 and Abeta42/Abeta38 ratios: better diagnostic markers of Alzheimer disease. Ann Clin Transl Neurol. 2016; 3: 154– 65. 27042676 PMC4774260
  3. [148]Sawa M, Zhao H, Kordasiewicz H, Fitzsimmons B, Derse D, Becker A. APP-directed antisense oligonucleotides reduced APP gene expression in mouse models of Down Syndrome. Proceedings of the 48th annual meeting of the Society for Neurosciences. San Diego, CA 2018.

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Authors
Sawa, M., Overk, C., Becker, A., Derse, D., Albay, R., Weldy, K., Salehi, A., Beach, T. G., Doran, E., Head, E., Yu, Y. E., & Mobley, W. C.
Affiliations
  • University of California San Diego (US)
  • Stanford Medicine (US)
  • Banner Sun Health Research Institute (US)
  • University of California, Irvine (US)
  • Roswell Park Comprehensive Cancer Center (US)
Corresponding author
Mobley, William C
Venue
Alzheimer's & Dementia
Publisher
Wiley
Published
2021-11-10
Volume
18
Issue
6
Pages
1203-1234
ISSN
  • 1552-5260 (ISSN-L)
  • 1552-5279
OpenAlex
W3211991404
Cited by
54
References
178
Citations by year
2026: 10 · 2025: 13 · 2024: 10 · 2023: 17 · 2022: 4
FWCI
6.13
Type
journal article
Language
en
Open access
Locations
  • Alzheimer s & Dementia (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institutes of Health (R01AG055523, R01AG061151 10 (WM), R01NS066072 (YEY))
  • National Institute on Aging (U19AG068054, P30AG066519 (EH))
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Down syndrome and intellectual disability research
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Down syndrome, Alzheimer's disease
MeSH terms
Alzheimer Disease, Animals, Disease Models, Animal, Down Syndrome, Humans, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, Gene Dosage, Mice

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