Lehmer, C.* ; Oeckl, P.* ; Weishaupt, J.H.* ; Volk, A.E.* ; Diehl-Schmid, J.* ; Schroeter, M.L.* ; Lauer, M.* ; Kornhuber, J.* ; Levin, J.* ; Fassbender, K.* ; Landwehrmeyer, B.* ; Schludi, M.H.* ; Arzberger, T.* ; Kremmer, E. ; Flatley, A. ; Feederle, R. ; Steinacker, P.* ; Weydt, P.* ; Ludolph, A.C.* ; Edbauer, D.* ; Otto, M.*
Poly-GP in cerebrospinal fluid links C9orf72-associated dipeptide repeat expression to the asymptomatic phase of ALS/FTD.
EMBO Mol. Med. 9, 859-868 (2017)
The C9orf72 GGGGCC repeat expansion is a major cause of amyotrophic lateral sclerosis and frontotemporal dementia (c9ALS/FTD). Non-conventional repeat translation results in five dipeptide repeat proteins (DPRs), but their clinical utility, overall significance, and temporal course in the pathogenesis of c9ALS/FTD are unclear, although animal models support a gain-of-function mechanism. Here, we established a poly-GP immunoassay from cerebrospinal fluid (CSF) to identify and characterize C9orf72 patients. Significant poly-GP levels were already detectable in asymptomatic C9orf72 mutation carriers compared to healthy controls and patients with other neurodegenerative diseases. The poly-GP levels in asymptomatic carriers were similar to symptomatic c9ALS/FTD cases. Poly-GP levels were not correlated with disease onset, clinical scores, and CSF levels of neurofilaments as a marker for axonal damage. Poly-GP determination in CSF revealed a C9orf72 mutation carrier in our cohort and may thus be used as a diagnostic marker in addition to genetic testing to screen patients. Presymptomatic expression of poly-GP and likely other DPR species may contribute to disease onset and thus represents an alluring therapeutic target.
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Publication type
Article: Journal article
Document type
Scientific Article
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Keywords
C9orf72 ; Amyotrophic Lateral Sclerosis ; Biomarker ; Cerebrospinal Fluid ; Frontotemporal Dementia; C9orf72 Hexanucleotide Repeat; Frontotemporal Dementia; Ggggcc-repeat; Clinicopathological Correlations; Antisense Transcripts; Rna Foci; Proteins; Expansions; Als; C9ftd/als
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Language
english
Publication Year
2017
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2017
ISSN (print) / ISBN
1757-4676
e-ISSN
1757-4684
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Volume: 9,
Issue: 7,
Pages: 859-868
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Wiley
Publishing Place
Chichester
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0000-00-00
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0000-00-00
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0000-00-00
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Peer reviewed
Institute(s)
CF Monoclonal Antibodies (CF-MAB)
POF-Topic(s)
30504 - Mechanisms of Genetic and Environmental Influences on Health and Disease
30201 - Metabolic Health
Research field(s)
Immune Response and Infection
Helmholtz Diabetes Center
PSP Element(s)
G-501760-001
G-502210-001
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Erfassungsdatum
2017-06-26