Cited by 131Down syndrome and intellectual disability researchGenomic variations and chromosomal abnormalitiesGenetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities

A non-mosaic transchromosomic mouse model of down syndrome carrying the long arm of human chromosome 21.

Open access
Kazuki, Yasuhiro, Gao, Feng J, Li, Yicong, Moyer, Anna J, Devenney, Benjamin, Hiramatsu, Kei, Miyagawa-Tomita, Sachiko, Abe, Satoshi +26 more·2020·eLife

Abstract

Animal models of Down syndrome (DS), trisomic for human chromosome 21 (HSA21) genes or orthologs, provide insights into better understanding and treatment options. The only existing transchromosomic (Tc) mouse DS model, Tc1, carries a HSA21 with over 50 protein coding genes (PCGs) disrupted. Tc1 is mosaic, compromising interpretation of results. Here, we “clone” the 34 MB long arm of HSA21 (HSA21q) as a mouse artificial chromosome (MAC). Through multiple steps of microcell-mediated chromosome transfer, we created a new Tc DS mouse model, Tc(HSA21q;MAC)1Yakaz (“TcMAC21”). TcMAC21 is not mosaic and contains 93% of HSA21q PCGs that are expressed and regulatable. TcMAC21 recapitulates many DS phenotypes including anomalies in heart, craniofacial skeleton and brain, molecular/cellular pathologies, and impairments in learning, memory and synaptic plasticity. TcMAC21 is the most complete genetic mouse model of DS extant and has potential for supporting a wide range of basic and preclinical research.

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Crossref · 10.7554/elife.56223

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  • In MAC21, the cerebellum is decreased in volume at 4-5 months, there is no change in hippocampal volume, and total brain volume is significantly larger in trisomic mice.

    “Similar to human and Ts65Dn data, in MAC21 the cerebellum is decreased in volume compared to euploid at 4–5 months of age. However, there is no change in hippocampal volume and total brain volume is significantly larger in the trisomic mice.”

    From Neurodevelopment in Down syndrome: Concordance in humans and models (2022) · cites this paper as Kazuki et al., 2020

    The Results section (brain morphometric phenotypes; page unavailable) reports that ~4.5-month-old TcMAC21 mice had significantly larger total brain volume and a significantly smaller cerebellar percentage of brain volume than euploid mice. The Figure 4 caption says hippocampal percentage was analyzed, but the passages in our copy do not state that hippocampal volume was unchanged. The reported cerebellar decrease is relative to total brain volume, not an explicitly reported decrease in absolute volume. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • MAC21 appears to have an increase in brain volume, the opposite of what is observed in humans.

    “MAC21, though not well characterized, appears to have an increase in brain volume, the opposite of what is observed in humans.”

    From Neurodevelopment in Down syndrome: Concordance in humans and models (2022) · cites this paper as Kazuki et al., 2020

    The Results section (‘TcMAC21 mice have abnormalities in heart, brain and skull’; page unavailable) reports slightly larger total brain volume in young adult TcMAC21 mice than in euploid controls. It mentions cerebellar hypoplasia in people with Down syndrome, but does not establish the claimed opposite pattern for total brain volume in humans. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • MAC21 show learning and memory deficits.

    “In addition to modeling the genetics of DS, they also show some of the same behavioral deficits in learning and memory.”

    From Neurodevelopment in Down syndrome: Concordance in humans and models (2022) · cites this paper as Kazuki et al., 2020

  • MAC21 recapitulates some phenotypes described in individuals with DS.

    “The transchromosomic mouse model, MAC21, has undergone preliminary characterization and recapitulates some of the phenotypes described in individuals with DS (Kazuki et al., 2020).”

    From Neurodevelopment in Down syndrome: Concordance in humans and models (2022) · cites this paper as Kazuki et al., 2020

  • MAC21 recapitulate non-neuronal phenotypes such as skeletal changes and cardiovascular abnormalities.

    “Like Dp1Tyb/Dp(16)1Yey, they appear to recapitulate some of the non-neuronal phenotypes associated with DS such as skeletal changes and cardiovascular abnormalities.”

    From Neurodevelopment in Down syndrome: Concordance in humans and models (2022) · cites this paper as Kazuki et al., 2020

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Research works printed but not linked: 1

  1. Besson V 2005 Studying dosage effects for human chromosome 21 homologous genes using chromosomal engineering in the mouse 19th International Mouse Genome Conference

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Authors
Kazuki, Y., Gao, F. J., Li, Y., Moyer, A. J., Devenney, B., Hiramatsu, K., Miyagawa-Tomita, S., Abe, S., Kazuki, K., Kajitani, N., Uno, N., Takehara, S., Takiguchi, M., Yamakawa, M., Hasegawa, A., Shimizu, R., Matsukura, S., Noda, N., Ogonuki, N., Inoue, K., Matoba, S., Ogura, A., Florea, L. D., Savonenko, A., Xiao, M., Wu, D., Batista, D. A., Yang, J., Qiu, Z., Singh, N., Richtsmeier, J. T., Takeuchi, T., Oshimura, M., & Reeves, R. H.
Affiliations
  • Chromosome Engineering Research Center (JP)
  • Johns Hopkins University (US)
  • Tottori University (JP)
  • Department of Animal Nursing Science, Yamazaki University of Animal Health Technology, Hachioji, Tokyo, Japan
  • Tohoku University (JP)
  • National Institute of Advanced Industrial Science and Technology (JP)
  • RIKEN BioResource Research Center (JP)
  • Department of Neuroscience, John Hopkins University School of Medicine, Baltimore, United States
  • Zhejiang University (CN)
  • Pennsylvania State University (US)
  • California State University, Sacramento (US)
Corresponding author
  • Kazuki, Yasuhiro
  • Reeves, Roger H
Venue
eLife
Published
2020-06-29
Volume
9
ISSN
2050-084X (ISSN-L)
OpenAlex
W3037987616
Cited by
125
References
77
Citations by year
2026: 17 · 2025: 20 · 2024: 18 · 2023: 19 · 2022: 23 · 2021: 22 · 2020: 6
FWCI
14.25
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R21HD098540-01, R01HD038384)
  • Japan Society for the Promotion of Science (25221308)
  • Core Research for Evolutional Science and Technology (JPMJCR18S4)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Down syndrome and intellectual disability research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomic variations and chromosomal abnormalities
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
Keywords
Down syndrome, artificial chromosomes, microcell-mediated chromosome transfer, cardiac anomalies, craniofacial anomalies, brain anomalies, learning and memory impairment, synaptic plasticity, gene expression
MeSH terms
Whole Genome Sequencing, Animals, Brain, Chromosomes, Human, Pair 21, Disease Models, Animal, Down Syndrome, Female, Heart Defects, Congenital, Humans, Male, Mice, Inbred C57BL, Mice, Transgenic, Trisomy, Mice

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