title: DNA sequence variants in the metabotropic glutamate receptor 3 and risk to schizophrenia: an association study.
abstract: OBJECTIVE
  Recent studies investigating the association of DNA variants in the metabotropic glutamate receptor gene (GRM3) with schizophrenia susceptibility revealed conflicting results. In this study, we focused on DNA sequence variants, for which association was reported and attempted to replicate association with schizophrenia or with cognitive deficits known to be present in patients with schizophrenia.
  
  
  METHODS
  A sample of 242 families with affected offspring and five single nucleotide markers located in the genomic region of GRM3 has been used to replicate association with schizophrenia. In addition, results of neuropsychological tests, trail making test B and the Stroop color-naming task were available for a subgroup of these families (N=88) and an independent sample of 148 patients with schizophrenia. Correlation of these measurements with genotypic data was performed using analysis of variance.
  
  
  RESULTS
  No statistical evidence for association with schizophrenia or correlation with cognitive deficits as measured by the trail making test B or the Stroop color-naming task and the five DNA sequence variants could be detected. A trend towards association with schizophrenia was revealed for a single marker (rs2237562, P=0.056) and for 2-marker and 3-marker haplotypes containing this variant.
  
  
  CONCLUSIONS
  Our study of DNA sequence variants in the GRM3 gene did not provide further support for genetic association with schizophrenia or for correlation with cognitive deficits.
authors.affiliation: Western Australian Institute of Medical Research and Centre for Medical Research, School of Psychiatry and Clinical Neurosciences, University of Western Australia, Perth, Australia. sschwab@cyllene.uwa.edu.au
authors.forename: Sibylle G
authors.initials: SG
authors.lastname: Schwab
authors.forename: Christie
authors.initials: C
authors.lastname: Plummer
authors.forename: Margot
authors.initials: M
authors.lastname: Albus
authors.forename: Margitta
authors.initials: M
authors.lastname: Borrmann-Hassenbach
authors.forename: Bernard
authors.initials: B
authors.lastname: Lerer
authors.forename: Matyas
authors.initials: M
authors.lastname: Trixler
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Maier
authors.forename: Dieter B
authors.initials: DB
authors.lastname: Wildenauer
mesh_terms: D000483:Alleles; D001483:Base Sequence; D002897:Chromosomes, Human, Pair 7; D004252:DNA Mutational Analysis; D005787:Gene Frequency; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium / Q000235:genetics; D009154:Mutation / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D018094:Receptors, Metabotropic Glutamate / Q000235:genetics*; D012559:Schizophrenia / Q000235:genetics*
chemical_list: D005819:Genetic Markers; D018094:Receptors, Metabotropic Glutamate; C102718:metabotropic glutamate receptor 3