FUS and frontotemporal dementia: These genetic discoveries, coupled with pathological inclusions of TDP-43 (Neumann et al., 2006; Arai et al., 2006) or FUS (Neumann et al., 2009) that are found both in ALS and FTD, have supported common molecular mechanisms, in particular, disruption in RNA and protein homeostasis, to underlie both diseases (reviewed in Ling et al., 2013; Lattante et al., 2015; Taylor et al., 2016).