A combined linkage analysis of 60 families from National Institute of Mental Health Bipolar Genetics Initiative (NIMH-BPGI) suggested an association between a SNP in the second intron on the GRIA1 gene and psychotic bipolar disorder.71 A case–control study showed that two specific polymorphisms for the GRA1 were associated with schizophrenia in Italians.72 Here, GRIA1 is linked to schizophrenia.