Journal Article

DZNE-2020-03447

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dipeptide repeat protein pathology in C9ORF72 mutation cases: clinico-pathological correlations.

Mackenzie, I. R. A.Extern* ; Arzberger, T.DZNE* ; Kremmer, E.DZNE* ; Troost, D. ; Lorenzl, S. ; Mori, K. ; Weng, S.-M.DZNE* ; Haass, C.DZNE* ; Kretzschmar, H.Extern* ; Edbauer, D. (Corresponding author)DZNE* ; Neumann, M. (Last author)DZNE*

2013
Springer Heidelberg

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Please use a persistent id in citations: doi:10.1007/s00401-013-1181-y

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.

Keyword(s): Adult (MeSH) ; Aged (MeSH) ; Amyotrophic Lateral Sclerosis: genetics (MeSH) ; Amyotrophic Lateral Sclerosis: metabolism (MeSH) ; Amyotrophic Lateral Sclerosis: pathology (MeSH) ; Brain: metabolism (MeSH) ; Brain: pathology (MeSH) ; C9orf72 Protein (MeSH) ; DNA Repeat Expansion (MeSH) ; DNA-Binding Proteins (MeSH) ; Frontotemporal Dementia: genetics (MeSH) ; Frontotemporal Dementia: metabolism (MeSH) ; Frontotemporal Dementia: pathology (MeSH) ; Humans (MeSH) ; Middle Aged (MeSH) ; Mutation (MeSH) ; Proteins: genetics (MeSH) ; Proteins: metabolism (MeSH) ; C9orf72 Protein ; C9orf72 protein, human ; DNA-Binding Proteins ; Proteins

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Contributing Institute(s):

1. Molecular Neuropathology of Neurodegenerative Diseases (AG Neumann)
2. Clinical Neurodegeneration (AG Levin)
3. Molecular Neurodegeneration (AG Haass)
4. Cell Biology of Neurodegeneration (AG Edbauer)
5. Neuropathology / Brainbank (Neuropathology / Brainbank)

Research Program(s):

1. 344 - Clinical and Health Care Research (POF3-344) (POF3-344)
2. 342 - Disease Mechanisms and Model Systems (POF3-342) (POF3-342)

Appears in the scientific report 2013

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Database coverage:
; BIOSIS Previews ; Clarivate Analytics Master Journal List ; Current Contents - Life Sciences ; Ebsco Academic Search ; IF >= 15 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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