GRIN1 and schizophrenia: Previous exploratory studies have indicated that GRIN1 (rs11146020) is a good candidate for susceptibility to schizophrenia [24, 25, 33], and other studies have suggested that the combined effects of GRIN1 and GRIN2B gene polymorphisms, including rs1805247 and rs1805502, might be involved in the etiology of schizophrenia.