title: Antipsychotic pharmacogenomics in first episode psychosis: a role for glutamate genes.
abstract: Genetic factors may underlie beneficial and adverse responses to antipsychotic treatment. These relationships may be easier to identify among patients early in the course of disease who have limited exposure to antipsychotic drugs. We examined 86 first episode patients (schizophrenia, psychotic bipolar disorder and major depressive disorder with psychotic features) who had minimal to no prior antipsychotic exposure in a 6-week pharmacogenomic study of antipsychotic treatment response. Response was measured by change in Brief Psychiatric Rating Scale total score. Risperidone monotherapy was the primary antipsychotic treatment. Pharmacogenomic association studies were completed to (1) examine candidate single-nucleotide polymorphisms (SNPs) in genes known to be involved with glutamate signaling, and (2) conduct an exploratory genome-wide association study of symptom response to identify potential novel associations for future investigation. Two SNPs in GRM7 (rs2069062 and rs2014195) were significantly associated with antipsychotic response in candidate gene analysis, as were two SNPs in the human glutamate receptor delta 2 (GRID2) gene (rs9307122 and rs1875705) in genome-wide association analysis. Further examination of these findings with those from a separate risperidone-treated study sample demonstrated that top SNPs in both studies were overrepresented in glutamate genes and that there were similarities in neurodevelopmental gene categories associated with drug response from both study samples. These associations indicate a role for gene variants related to glutamate signaling and antipsychotic response with more broad association patterns indicating the potential importance of genes involved in neuronal development.
authors.affiliation: Department of Pharmacy and Therapeutics, University of Pittsburgh School of Pharmacy, Pittsburgh, PA, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Stevenson
authors.affiliation: Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Reilly
authors.affiliation: Jesse Brown Veterans Administration Medical Center, Chicago, IL, USA.
authors.forename: M S H
authors.initials: MS
authors.lastname: Harris
authors.affiliation: Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, USA.
authors.forename: S R
authors.initials: SR
authors.lastname: Patel
authors.affiliation: Department of Psychiatry, University of Illinois at Chicago, Chicago, IL, USA.
authors.forename: P J
authors.initials: PJ
authors.lastname: Weiden
authors.affiliation: Department of Psychiatry, Western Psychiatric Institute and Clinic, Pittsburgh, PA, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Prasad
authors.affiliation: Department of Psychiatry, University of Chicago, Chicago, IL, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Badner
authors.affiliation: Department of Psychiatry, Western Psychiatric Institute and Clinic, Pittsburgh, PA, USA.|Department of Human Genetics, University of Pittsburgh, Pittsburgh, PA, USA.
authors.forename: V L
authors.initials: VL
authors.lastname: Nimgaonkar
authors.affiliation: Department of Psychiatry, Harvard Medical School, Boston, MA, USA.
authors.forename: M S
authors.initials: MS
authors.lastname: Keshavan
authors.affiliation: Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Sweeney
authors.affiliation: Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Bishop
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000627:therapeutic use*; D001714:Bipolar Disorder / Q000188:drug therapy / Q000235:genetics; D003865:Major Depressive Disorder / Q000188:drug therapy / Q000235:genetics; D005260:Female; D055106:Genome-Wide Association Study; D006801:Humans; D008297:Male; D010597:Pharmacogenetics; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D011618:Psychotic Disorders / Q000188:drug therapy* / Q000235:genetics*; D017470:Receptors, Glutamate / Q000235:genetics*; D018094:Receptors, Metabotropic Glutamate / Q000235:genetics*; D018967:Risperidone / Q000627:therapeutic use; D012559:Schizophrenia / Q000188:drug therapy / Q000235:genetics; D055815:Young Adult
chemical_list: D014150:Antipsychotic Agents; D017470:Receptors, Glutamate; D018094:Receptors, Metabotropic Glutamate; C107913:glutamate receptor delta 2; C102719:metabotropic glutamate receptor 7; D018967:Risperidone