title: Gene variants associated with schizophrenia in a Norwegian genome-wide study are replicated in a large European cohort.
abstract: We have performed a genome-wide association study (GWAS) of schizophrenia in a Norwegian discovery sample of 201 cases and 305 controls (TOP study) with a focused replication analysis in a larger European sample of 2663 cases and 13,780 control subjects (SGENE-plus study). Firstly, the discovery sample was genotyped with Affymetrix Genome-Wide Human SNP Array 6.0 and 572,888 markers were tested for schizophrenia association. No SNPs in the discovery sample attained genome-wide significance (P<8.7 x 10(-8)). Secondly, based on the GWAS data, we selected 1000 markers with the lowest P values in the discovery TOP sample, and tested these (or HapMap-based surrogates) for association in the replication sample. Sixteen loci were associated with schizophrenia (nominal P value<0.05 and concurring OR) in the replication sample. As a next step, we performed a combined analysis of the findings from these two studies, and the strongest evidence for association with schizophrenia was provided for markers rs7045881 on 9p21, rs433598 on 16p12 and rs10761482 on 10q21. The markers are located in PLAA, ACSM1 and ANK3, respectively. PLAA has not previously been described as a susceptibility gene, but 9p21 is implied as a schizophrenia linkage region. ACSM1 has been identified as a susceptibility gene in a previous schizophrenia GWAS study. The association of ANK3 with schizophrenia is intriguing in light of recent associations of ANK3 with bipolar disorder, thereby supporting the hypothesis of an overlap in genetic susceptibility between these psychopathological entities.
authors.affiliation: Institute of Psychiatry, University of Oslo, P.O. 1130, Blindern, N-0318 Oslo, Norway
authors.forename: Lavinia
authors.initials: L
authors.lastname: Athanasiu
authors.forename: Morten
authors.initials: M
authors.lastname: Mattingsdal
authors.forename: Anna K
authors.initials: AK
authors.lastname: Kähler
authors.forename: Andrew
authors.initials: A
authors.lastname: Brown
authors.forename: Omar
authors.initials: O
authors.lastname: Gustafsson
authors.forename: Ingrid
authors.initials: I
authors.lastname: Agartz
authors.forename: Ina
authors.initials: I
authors.lastname: Giegling
authors.forename: Pierandrea
authors.initials: P
authors.lastname: Muglia
authors.forename: Sven
authors.initials: S
authors.lastname: Cichon
authors.forename: Marcella
authors.initials: M
authors.lastname: Rietschel
authors.forename: Olli P H
authors.initials: OP
authors.lastname: Pietiläinen
authors.forename: Leena
authors.initials: L
authors.lastname: Peltonen
authors.forename: Elvira
authors.initials: E
authors.lastname: Bramon
authors.forename: David
authors.initials: D
authors.lastname: Collier
authors.forename: David St
authors.initials: DS
authors.lastname: Clair
authors.forename: Engilbert
authors.initials: E
authors.lastname: Sigurdsson
authors.forename: Hannes
authors.initials: H
authors.lastname: Petursson
authors.forename: Dan
authors.initials: D
authors.lastname: Rujescu
authors.forename: Ingrid
authors.initials: I
authors.lastname: Melle
authors.forename: Vidar M
authors.initials: VM
authors.lastname: Steen
authors.forename: Srdjan
authors.initials: S
authors.lastname: Djurovic
authors.forename: Ole A
authors.initials: OA
authors.lastname: Andreassen
mesh_terms: D017487:Ankyrins / Q000235:genetics*; D003066:Coenzyme A Ligases / Q000235:genetics; D015331:Cohort Studies; D005060:Europe / Q000453:epidemiology; D005260:Female; D055106:Genome-Wide Association Study; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D009664:Norway / Q000453:epidemiology; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D011506:Proteins / Q000235:genetics; D012016:Reference Values; D012189:Retrospective Studies; D012559:Schizophrenia / Q000453:epidemiology* / Q000235:genetics*; D044465:White People
chemical_list: C490613:ANK3 protein, human; D017487:Ankyrins; D011506:Proteins; C055324:phospholipase A2-activating protein; C437335:ACSM1 protein, human; D003066:Coenzyme A Ligases