title: Support for association of schizophrenia with genetic variation in the 6p22.3 gene, dysbindin, in sib-pair families with linkage and in an additional sample of triad families.
abstract: Genetic variants in a gene on 6p22.3, dysbindin, have been shown recently to be associated with schizophrenia (Straub et al. 2002a). There is no doubt that replication in other independent samples would enhance the significance of this finding considerably. Since the gene is located in the center of the linkage peak on chromosome 6p that we reported earlier, we decided to test six of the most positive DNA polymorphisms in a sib-pair sample and in an independently ascertained sample of triads comprising 203 families, including the families for which we detected linkage on chromosome 6p. Evidence for association was observed in the two samples separately as well as in the combined sample (P=.00068 for SNP rs760761). Multilocus haplotype analysis increased the significance further to .00002 for a two-locus haplotype and to .00001 for a three-locus haplotype. Estimation of frequencies for six-locus haplotypes revealed one common haplotype with a frequency of 73.4% in transmitted, and only 57.6% in nontransmitted, parental haplotypes. All other six-locus haplotypes occurring at a frequency of >1% were less often transmitted than nontransmitted. Our results represent a first successful replication of linkage disequilibrium in psychiatric genetics detected in a region with previous evidence of linkage and will encourage the search for causes of schizophrenia by the genetic approach.
authors.affiliation: Molecular Genetics Laboratory, University of Bonn, Bonn, Germany.
authors.forename: Sibylle G
authors.initials: SG
authors.lastname: Schwab
authors.forename: Michael
authors.initials: M
authors.lastname: Knapp
authors.forename: Stephanie
authors.initials: S
authors.lastname: Mondabon
authors.forename: Joachim
authors.initials: J
authors.lastname: Hallmayer
authors.forename: Margitta
authors.initials: M
authors.lastname: Borrmann-Hassenbach
authors.forename: Margot
authors.initials: M
authors.lastname: Albus
authors.forename: Bernard
authors.initials: B
authors.lastname: Lerer
authors.forename: Marcella
authors.initials: M
authors.lastname: Rietschel
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: D002352:Carrier Proteins / Q000235:genetics*; D002874:Chromosome Mapping; D002896:Chromosomes, Human, Pair 6 / Q000235:genetics*; D000074765:Dysbindin; D049029:Dystrophin-Associated Proteins; D005787:Gene Frequency / Q000235:genetics; D014644:Genetic Variation / Q000235:genetics*; D006239:Haplotypes / Q000235:genetics; D006801:Humans; D015810:Linkage Disequilibrium / Q000235:genetics; D008126:Lod Score; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D012559:Schizophrenia / Q000235:genetics*; D035781:Siblings
chemical_list: D002352:Carrier Proteins; C432416:DTNBP1 protein, human; D000074765:Dysbindin; D049029:Dystrophin-Associated Proteins