STX1A and schizophrenia: Furthermore, both ankyrin 3 (ANK3) and syntaxin 1 (STX1), two schizophrenia-associated proteins, have been shown to be phosphorylated by CKIIα (Bréchet et al., 2008; Ferreira et al., 2008; Foletti et al., 2000; Hirling and Scheller, 1996).