Genetic contribution of FUS to frontotemporal lobar degeneration

Neurology
T Van LangenhoveChristine Van Broeckhoven

Abstract

Recently, the FUS gene was identified as a new causal gene for amyotrophic lateral sclerosis (ALS) in approximately 4% of patients with familial ALS. Since ALS and frontotemporal lobar degeneration (FTLD) are part of a clinical, pathologic, and genetic disease spectrum, we investigated a potential role of FUS in FTLD. We performed mutational analysis of FUS in 122 patients with FTLD and 15 patients with FTLD-ALS, as well as in 47 patients with ALS. Mutation screening was performed by sequencing of PCR amplicons of the 15 FUS exons. We identified 1 patient with FTLD with a novel missense mutation, M254V, that was absent in 638 control individuals. In silico analysis predicted this amino acid substitution to be pathogenic. The patient did not have a proven family history of neurodegenerative brain disease. Further, we observed the known R521H mutation in 1 patient with ALS. No FUS mutations were detected in the patients with FTLD-ALS. While insertions/deletions of 2 glycines (G) were suggested to be pathogenic in the initial FUS reports, we observed an identical GG-deletion in 2 healthy individuals and similar G-insertions/deletions in 4 other control individuals, suggesting that G-insertions/deletions within this G-rich region m...Continue Reading

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