GGGGCC repeat expansions within intron 1 of the C9ORF72 gene are the most common cause of familial amyotrophic lateral sclerosis (ALS) and familial frontotemporal degeneration (FTD) [1,2], though how this genetic change results in neuronal injury is not yet understood. This evidence concerns the gene C9orf72 and frontotemporal dementia.