C9orf72 and frontotemporal dementia: A recent review extends these definitions and describes, in depth, the network of RNA and protein interactions in FTD (Fontana et al., 2015), encompassing C9ORF72, a gene mutated in FTD and ALS (DeJesus-Hernandez et al., 2011; Renton et al., 2011) and associated with RNA splicing factors (Cooper-Knock et al., 2015), which in turn may regulate tau.