PALS2 and bipolar disorder: Recent GWAS have demonstrated a relationship between MPP6 and various psychiatric disorders, including schizophrenia (Fritz et al. 2019; Ganapathiraju et al. 2016; Greenwood et al. 2019; Le Hellard et al. 2017; Lin et al. 2016), bipolar disorder (Mullins et al. 2021), and autism spectrum disorder (Chang et al. 2015; Guo et al. 2019; Le Hellard et al. 2017; Li et al. 2014).