GRIA1 and schizophrenia: Post‐mortem studies have suggested that GluA1 expression is decreased in the hippocampus of patients with schizophrenia (e.g. Eastwood et al., 1995) and, significantly, recent large scale GWAS meta‐analyses have established genome‐wide association to schizophrenia for the Gria1 locus (Ripke et al., 2013; Schizophrenia Working Group of the Psychiatric Genomics, 2014).