Cited by 171Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsRNA Research and Splicing

The Trem2 R47H Alzheimer's risk variant impairs splicing and reduces Trem2 mRNA and protein in mice but not in humans

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Xiang, Xianyuan, Piers, Thomas M., Wefers, Benedikt, Zhu, Kaichuan, Mallach, Anna, Brunner, Bettina, Kleinberger, Gernot, Song, Wilbur +5 more·2018·Molecular Neurodegeneration

Abstract

BACKGROUND: The R47H variant of the Triggering Receptor Expressed on Myeloid cells 2 (TREM2) significantly increases the risk for late onset Alzheimer's disease. Mouse models accurately reproducing phenotypes observed in Alzheimer' disease patients carrying the R47H coding variant are required to understand the TREM2 related dysfunctions responsible for the enhanced risk for late onset Alzheimer's disease. METHODS: A CRISPR/Cas9-assisted gene targeting strategy was used to generate Trem2 R47H knock-in mice. Trem2 mRNA and protein levels as well as Trem2 splicing patterns were assessed in these mice, in iPSC-derived human microglia-like cells, and in human brains from Alzheimer's patients carrying the TREM2 R47H risk factor. RESULTS: Two independent Trem2 R47H knock-in mouse models show reduced Trem2 mRNA and protein production. In both mouse models Trem2 haploinsufficiency was due to atypical splicing of mouse Trem2 R47H, which introduced a premature stop codon. Cellular splicing assays using minigene constructs demonstrate that the R47H variant induced abnormal splicing only occurs in mice but not in humans. TREM2 mRNA levels and splicing patterns were both normal in iPSC-derived human microglia-like cells and patient brains with the TREM2 R47H variant. CONCLUSIONS: The Trem2 R47H variant activates a cryptic splice site that generates miss-spliced transcripts leading to Trem2 haploinsufficiency only in mice but not in humans. Since Trem2 R47H related phenotypes are mouse specific and do not occur in humans, humanized TREM2 R47H knock-in mice should be generated to study the cellular consequences caused by the human TREM2 R47H coding variant. Currently described phenotypes of Trem2 R47H knock-in mice can therefore not be translated to humans.

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  1. [45]Wang Y, Ulland TK, Ulrich JD, Song W, Tzaferis JA, Hole JT, et al. TREM2-mediated early microglial response limits diffusion and toxicity of amyloid plaques. J Exp Med. [Internet]. 2016;213:667–75. Available from: http://www.jem.org/lookup/doi/10.1084/jem.20151948. PMC4854736 27091843 · DOI · Paper page

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Authors
Xiang, X., Piers, T. M., Wefers, B., Zhu, K., Mallach, A., Brunner, B., Kleinberger, G., Song, W., Colonna, M., Herms, J., Wurst, W., Pocock, J. M., & Haass, C.
Affiliations
  • Ludwig-Maximilians-Universität München (DE)
  • UCL Queen Square Institute of Neurology (GB)
  • German Center for Neurodegenerative Diseases (DE)
  • Munich Cluster for Systems Neurology (DE)
  • Washington University in St. Louis (US)
Corresponding author
  • Xiang, Xianyuan
  • Piers, Thomas M.
  • Wefers, Benedikt
  • Zhu, Kaichuan
  • Mallach, Anna
  • Brunner, Bettina
  • Kleinberger, Gernot
  • Song, Wilbur
  • Colonna, Marco
  • Herms, Jochen
  • Wurst, Wolfgang
  • Pocock, Jennifer M.
  • Haass, Christian
Venue
Molecular Neurodegeneration
Published
2018-09-06
Volume
13
Issue
1
Pages
49-49
ISSN
1750-1326 (ISSN-L)
OpenAlex
W2890074452
Cited by
170
References
45
Citations by year
2026: 10 · 2025: 13 · 2024: 18 · 2023: 43 · 2022: 10 · 2021: 26 · 2020: 35 · 2019: 11 · 2018: 3
FWCI
13.58
Type
journal article
Language
en
Open access
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UCL Discovery (University College London) (submittedVersion)
  • Open access LMU (Ludwid Maxmilian's Universitat Munchen) (submittedVersion, cc-by)
  • DZNE Pub (submittedVersion, other-oa)
  • PuSH - Publication Server of Helmholtz Zentrum München (submittedVersion, cc-by)
Funders
  • Deutsche Forschungsgemeinschaft (EXC 1010 SyNergy)
  • Koselleck Project (HA1737/16-1)
  • German Federal Ministry of Education and Research (01EK1605C)
  • Biotechnology and Biological Sciences Research Council (BB/M009513/1)
  • Innovative Medicines Initiative 2 Joint Undertaking (No 115976)
  • National Institute on Aging (RF1 AG051485)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
Keywords
TREM2, Alzheimer's disease, late-onset Alzheimer's disease, splicing, haploinsufficiency, cryptic splice site, knock-in mice, premature stop codon, microglia, species differences, humanized mice
MeSH terms
Alzheimer Disease, Animals, Brain, Disease Models, Animal, Humans, Membrane Glycoproteins, Mice, Transgenic, Receptors, Immunologic, RNA Splicing, RNA, Messenger, Genetic Variation, Microglia, Genetic Predisposition to Disease

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