Developmental abnormalities and age-related neurodegeneration in a mouse model of Down syndrome
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To study the pathogenesis of central nervous system abnormalities in Down syndrome (DS), we have analyzed a new genetic model of DS, the partial trisomy 16 (Ts65Dn) mouse. Ts65Dn mice have an extra copy of the distal aspect of mouse chromosome 16, a segment homologous to human chromosome 21 that contains much of the genetic material responsible for the DS phenotype. Ts65Dn mice show developmental delay during the postnatal period as well as abnormal behaviors in both young and adult animals that may be analogous to mental retardation. Though the Ts65Dn brain is normal on gross examination, there is age-related degeneration of septohippocampal cholinergic neurons and astrocytic hypertrophy, markers of the Alzheimer disease pathology that is present in elderly DS individuals. These findings suggest that Ts65Dn mice may be used to study certain developmental and degenerative abnormalities in the DS brain.
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The ApoE gene is associated with increased risk of AD and is not located on the triplicated segment of MMU16, but it is overexpressed to higher levels in Ts65Dn mice than predicted on the basis of gene dosage.
“Finally, the ApoE gene, which is associated with increased risk of AD (Corder et al., 1993), is not located on the triplicated segment of MMU16, but it is overexpressed to higher levels in Ts65Dn mice than is predicted on the basis of gene dosage (Holtzman et al., 1996).”
From <i>App</i>Gene Dosage Modulates Endosomal Abnormalities of Alzheimer's Disease in a Segmental Trisomy 16 Mouse Model of Down Syndrome (2003) · cites this paper as Holtzman et al., 1996
Ts65Dn mice do not deposit β-amyloid.
“Unlike what occurs in human disorders, however, Ts65Dn mice do not deposit -amyloid.”
From <i>App</i>Gene Dosage Modulates Endosomal Abnormalities of Alzheimer's Disease in a Segmental Trisomy 16 Mouse Model of Down Syndrome (2003) · cites this paper as Holtzman et al., 1996
Basal forebrain neurons in Ts65Dn mice later develop aging-related atrophy and degenerative changes, as in AD and DS.
“Ts65Dn mice also exhibit age-related atrophy and neurodegeneration of basal forebrain cholinergic neurons (BFCNs) and extensive astrocytic hypertrophy resembling these aspects of the neuropathology in AD and DS (Holtzman et al., 1996;Cooper et al., 2001).”
From <i>App</i>Gene Dosage Modulates Endosomal Abnormalities of Alzheimer's Disease in a Segmental Trisomy 16 Mouse Model of Down Syndrome (2003) · cites this paper as Holtzman et al., 1996
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- Authors
- Holtzman, D. M., Santucci, D., Kilbridge, J., Chua-Couzens, J., Fontana, D. J., Daniels, S. E., Johnson, R. M., Chen, K., Sun, Y., Carlson, E., Alleva, E., Epstein, C. J., & Mobley, W. C.
- Affiliations
- Washington University in St. Louis (US)
- ORCID
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 1996-11-12
- Volume
- 93
- Issue
- 23
- Pages
- 13333-13338
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC24093
- OpenAlex
- W2099268443
- Cited by
- 448
- References
- 2
- Citations by year
- 2026: 4 · 2025: 7 · 2024: 17 · 2023: 15 · 2022: 16 · 2021: 12 · 2020: 14 · 2019: 13 · 2018: 13 · 2017: 16 · 2016: 10 · 2015: 16 · 2014: 16 · 2013: 15 · 2012: 23
- FWCI
- 12.83
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- American Federation for Aging Research
- National Down Syndrome Society
- National Institutes of Health (5r01ag010672-05)
- National Institute on Aging (AG00445, AG10672, AG-08938, P01AG008938)
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Down syndrome and intellectual disability research
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
- Keywords
- Down syndrome, Ts65Dn mouse model, mouse model, neurodevelopmental delay, age-related neurodegeneration, Alzheimer disease pathology, intellectual disability, chromosome 21
- MeSH terms
- Aging, Animals, Avoidance Learning, Brain, Chromosome Mapping, Disease Models, Animal, Down Syndrome, Female, Humans, Learning, Male, Mice, Inbred Strains, Mice, Neurologic Mutants, Motor Activity, Nerve Degeneration, Stereotyped Behavior, Trisomy, Vocalization, Animal, Maze Learning, Mice
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