Noteworthy, c9orf72 repeat expansion display a high phenotypic variability, spanning from parkinsonism (Floris et al., 2012), to corticobasal degeneration (Lindquist et al., 2013), psychosis (Watson et al., 2016), and suicidal behavior (Synofzik et al., 2012). Here, C9orf72 is linked to psychotic disorder.