ERBB4 and schizophrenia: Rare mutations and tandem repeat expansion in ERBB4 have been linked to schizophrenia and intellectual disability (Kasnauskiene et al., 2013; Mojarad et al., 2022; Walsh et al., 2008), and common genetic variation in this locus also seems to be associated with the disorder (Marenco et al., 2011; Pardiñas et al., 2018; Trubetskoy et al., 2022).