Metabotropic glutamate receptor 3 (GRM3) gene variation is not associated with schizophrenia or bipolar affective disorder in the German population

Am J Med Genet. 2002 Jan 8;114(1):46-50. doi: 10.1002/ajmg.1624.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bipolar Disorder / etiology
  • Bipolar Disorder / genetics*
  • Female
  • Gene Frequency
  • Genetic Variation
  • Germany
  • Humans
  • Male
  • Receptors, Metabotropic Glutamate / genetics*
  • Schizophrenia / etiology
  • Schizophrenia / genetics*


  • Receptors, Metabotropic Glutamate
  • metabotropic glutamate receptor 3