title: Metabotropic glutamate receptor 3 (GRM3) gene variation is not associated with schizophrenia or bipolar affective disorder in the German population.
abstract: In the present study, we sought to identify genetic variation in the metabotropic glutamate receptor 3 (GRM3) gene, which has been mapped to chromosome 7q21.1-q21.2 [Scherer et al., 1996] and might contribute to genetic predisposition to schizophrenia and/or bipolar affective disorder. Using single-strand conformation analysis (SSCA), we screened the complete coding sequence as well as adjacent splice sites of the GRM3 gene in a sample of 46 bipolar affective and 46 schizophrenic patients. We detected three sequence variants: a rare C/T substitution at nucleotide position +885 (T209T), a C/T substitution at nucleotide position +2130 (Y624Y), and a more common C/T substitution at nucleotide position +1131 (A291A). The occurrence of the +1131C/T variant was investigated in a sample of bipolar affective patients (n=283), schizophrenic patients (n=265), and ethnically matched controls (n=227). We observed a significant overrepresentation of the +1131T allele in schizophrenic patients when compared to controls (P=0.0022). This finding was followed up in an independent sample of schizophrenic patients (n=288) and controls (n=162) and 128 schizophrenic trios but could not be confirmed. It is therefore unlikely that this variant plays a major role in predisposing to schizophrenia and/or bipolar affective disorder at least in the German population.
authors.affiliation: Institute of Human Genetics, University of Bonn, Bonn, Germany. borts@tcd.ie
authors.forename: Sylvia Bort
authors.initials: SB
authors.lastname: Martí
authors.forename: Sven
authors.initials: S
authors.lastname: Cichon
authors.forename: Peter
authors.initials: P
authors.lastname: Propping
authors.forename: Markus
authors.initials: M
authors.lastname: Nöthen
mesh_terms: D001714:Bipolar Disorder / Q000209:etiology / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D014644:Genetic Variation; D005858:Germany; D006801:Humans; D008297:Male; D018094:Receptors, Metabotropic Glutamate / Q000235:genetics*; D012559:Schizophrenia / Q000209:etiology / Q000235:genetics*
chemical_list: D018094:Receptors, Metabotropic Glutamate; C102718:metabotropic glutamate receptor 3