Department of Neurology
Computational Biology | Genomics | Molecular and Cellular Neuroscience | Nervous System Diseases | Neurology
Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) are overlapping, fatal neurodegenerative disorders in which the molecular and pathogenic basis remains poorly understood. Ubiquitinated protein aggregates, of which TDP-43 is a major component, are a characteristic pathological feature of most ALS and FTD patients. Here we use genome-wide linkage analysis in a large ALS/FTD kindred to identify a novel disease locus on chromosome 16p13.3. Whole-exome sequencing identified a CCNF missense mutation at this locus. Interrogation of international cohorts identified additional novel CCNF variants in familial and sporadic ALS and FTD. Enrichment of rare protein-altering CCNF variants was evident in a large sporadic ALS replication cohort. CCNF encodes cyclin F, a component of an E3 ubiquitin-protein ligase complex (SCF(Cyclin F)). Expression of mutant CCNF in neuronal cells caused abnormal ubiquitination and accumulation of ubiquitinated proteins, including TDP-43 and a SCF(Cyclin F) substrate. This implicates common mechanisms, linked to protein homeostasis, underlying neuronal degeneration.
DOI of Published Version
Nat Commun. 2016 Apr 15;7:11253. doi: 10.1038/ncomms11253. Link to article on publisher's site
Williams, Kelly L.; Kost, Jason; Brown, Robert H. Jr.; Landers, John E.; and Blair, Ian P., "CCNF mutations in amyotrophic lateral sclerosis and frontotemporal dementia" (2016). Open Access Articles. 2861.
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