SLC39A8 and schizophrenia: This missense ZIP8 polymorphism is associated with pleiotropic effects including childhood neurodevelopment and behavioral problems (Wahlberg et al., 2018), lower fluid intelligence (Hill et al., 2019), and greater risks for schizophrenia (Carrera et al., 2012; Schizophrenia Working Group of the Psychiatric Genomics Consortium, 2014; Pickrell et al., 2016) and Crohn’s disease (Li et al., 2016).