title: Association between the TRAX/DISC locus and both bipolar disorder and schizophrenia in the Scottish population.
abstract: The Translin-associated factor X/Disrupted in Schizophrenia 1 (TRAX/DISC) region was first implicated as a susceptibility locus for schizophrenia by analysis of a large Scottish family in which a t(1;11) translocation cosegregates with schizophrenia, bipolar disorder and recurrent major depression. We now report evidence for association between bipolar disorder and schizophrenia and this locus in the general Scottish population. A systematic study of linkage disequilibrium in a representative sample of the Scottish population was undertaken across the 510 kb of TRAX and DISC1. SNPs representing each haplotype block were selected for case-control association studies of both schizophrenia and bipolar disorder. Significant association with bipolar disorder in women P=0.00026 (P=0.0016 in men and women combined) was detected in a region of DISC1. This same region also showed nominally significant association with schizophrenia in both men and women combined, P=0.0056. Two further regions, one in TRAX and the second in DISC1, showed weaker evidence for sex-specific associations of individual haplotypes with bipolar disorder in men and women respectively, P<0.01. Only the association between bipolar women and DISC1 remained significant after correction for multiple testing. This result provides further supporting evidence for DISC1 as a susceptibility factor for both bipolar disorder and schizophrenia, consistent with the diagnoses in the original Scottish translocation family.
authors.affiliation: Medical Genetics Section, University of Edinburgh, Molecular Medicine Centre, Western General Hospital, Edinburgh, UK. Pippa.Thomson@ed.ac.uk
authors.forename: P A
authors.initials: PA
authors.lastname: Thomson
authors.forename: N R
authors.initials: NR
authors.lastname: Wray
authors.forename: J K
authors.initials: JK
authors.lastname: Millar
authors.forename: K L
authors.initials: KL
authors.lastname: Evans
authors.forename: S Le
authors.initials: SL
authors.lastname: Hellard
authors.forename: A
authors.initials: A
authors.lastname: Condie
authors.forename: W J
authors.initials: WJ
authors.lastname: Muir
authors.forename: D H R
authors.initials: DH
authors.lastname: Blackwood
authors.forename: D J
authors.initials: DJ
authors.lastname: Porteous
mesh_terms: D001714:Bipolar Disorder / Q000453:epidemiology / Q000235:genetics*; D016022:Case-Control Studies; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D009419:Nerve Tissue Proteins / Q000235:genetics*; D010375:Pedigree; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D012559:Schizophrenia / Q000453:epidemiology / Q000235:genetics*; D012606:Scotland / Q000453:epidemiology; D012737:Sex Factors; D018709:Statistics, Nonparametric
chemical_list: C412476:DISC1 protein, human; D004268:DNA-Binding Proteins; D009419:Nerve Tissue Proteins; C498305:TSNAX protein, human