Cited by 347Amyotrophic Lateral Sclerosis ResearchGenetic Neurodegenerative DiseasesAlzheimer's disease research and treatments

Dipeptide repeat protein pathology in C9ORF72 mutation cases: clinico-pathological correlations

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Mackenzie, Ian R., Arzberger, Thomas, Kremmer, Elisabeth, Troost, Dirk, Lorenzl, Stefan, Mori, Kohji, Weng, Shih-Ming, Haass, Christian +3 more·2013·Acta Neuropathologica

Abstract

Hexanucleotide repeat expansion in C9ORF72 is the most common genetic cause of frontotemporal dementia and motor neuron disease. Recently, unconventional non-ATG translation of the expanded hexanucleotide repeat, resulting in the production and aggregation of dipeptide repeat (DPR) proteins (poly-GA, -GR and GP), was identified as a potential pathomechanism of C9ORF72 mutations. Besides accumulation of DPR proteins, the second neuropathological hallmark lesion in C9ORF72 mutation cases is the accumulation of TDP-43. In this study, we characterized novel monoclonal antibodies against poly-GA and performed a detailed analysis of the neuroanatomical distribution of DPR and TDP-43 pathology in a cohort of 35 cases with the C9ORF72 mutation that included a broad spectrum of clinical phenotypes. We found the pattern of DPR pathology to be highly consistent among cases regardless of the phenotype with high DPR load in the cerebellum, all neocortical regions (frontal, motor cortex and occipital) and hippocampus, moderate pathology in subcortical areas and minimal pathology in lower motor neurons. No correlation between DPR pathology and the degree of neurodegeneration was observed, while a good association between TDP-43 pathology with clinical phenotype and degeneration in key anatomical regions was present. Our data confirm that the presence of DPR pathology is intimately related to C9ORF72 mutations. The observed dissociation between DPR inclusion body load and neurodegeneration might suggest inclusion body formation as a potentially protective response to cope with soluble toxic DPR species. Moreover, our data imply that alterations due to the C9ORF72 mutation resulting in TDP-43 accumulation and dysmetabolism as secondary downstream effects likely play a central role in the neurodegenerative process in C9ORF72 pathogenesis.

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  • Antibodies specific for each DPR stain SQSTM1-positive inclusions, suggesting that DPRs are targeted for clearance by the UPS and/or autophagy.

    “Antibodies specific for each dipeptide repeat (DPR) also stain SQSTM1-positive inclusions, including the star-like inclusions unique to C9orf72-related disease, suggesting that DPRs are targeted for clearance by the UPS and/or autophagy [119,169–171] (Figure 1).”

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Authors
Mackenzie, I. R., Arzberger, T., Kremmer, E., Troost, D., Lorenzl, S., Mori, K., Weng, S.-M., Haass, C., Kretzschmar, H. A., Edbauer, D., & Neumann, M.
Affiliations
  • University of British Columbia (CA)
  • German Center for Neurodegenerative Diseases (DE)
  • Amsterdam UMC Location University of Amsterdam (NL)
  • Ludwig-Maximilians-Universität München (DE)
  • Adolf-Butenandt-Institut für Physiologische Chemie, Physikalische Biochemie und Zellbiologie (DE)
  • Institut für Neuropathologie (DE)
Corresponding author
  • Edbauer, Dieter
  • Neumann, Manuela
Venue
Acta Neuropathologica
Published
2013-10-06
Volume
126
Issue
6
Pages
859-879
ISSN
  • 0001-6322 (ISSN-L)
  • 1432-0533
OpenAlex
W2092145129
Cited by
345
References
41
Citations by year
2026: 8 · 2025: 17 · 2024: 17 · 2023: 19 · 2022: 16 · 2021: 31 · 2020: 31 · 2019: 36 · 2018: 36 · 2017: 43 · 2016: 26 · 2015: 34 · 2014: 29 · 2013: 2
FWCI
19.25
Type
journal article
Language
en
Open access
Licence
Locations
  • Acta Neuropathologica (publishedVersion)
  • PubMed (publishedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • cIRcle (University of British Columbia) (submittedVersion, cc-by-nc-nd)
  • Site cant be reached (submittedVersion)
  • DZNE Pub (submittedVersion)
  • Pure Amsterdam UMC (submittedVersion)
  • Open Collections
Funders
Canadian Institutes of Health Research (74580)
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
C9orf72 mutation, dipeptide repeat proteins, hexanucleotide repeat expansion, TDP-43 pathology, frontotemporal dementia, motor neuron disease, monoclonal antibodies, neurodegeneration, cerebellum, hippocampus, motor cortex, lower motor neurons, inclusion bodies, neuropathology
MeSH terms
C9orf72 Protein, Adult, Aged, Amyotrophic Lateral Sclerosis, Brain, DNA-Binding Proteins, Humans, Middle Aged, Mutation, Proteins, DNA Repeat Expansion, Frontotemporal Dementia

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