title: Glycogen synthase kinase 3 beta gene structural variants as possible risk factors of bipolar depression.
abstract: The glycogen synthase kinase 3B (GSK3B) is an important target protein of several antidepressants, such as lithium, a mood stabilizer. Recent studies associated structural variations of the GSK3B gene to bipolar disorder (BP), although replications were not conclusive. Here we present data on copy number variations (CNVs) of the GSK3B gene probing the 9th exon region in 846 individuals (414 controls, 172 patients with major depressive disorder (MDD) and 260 with BP). A significant accumulation (odds ratio: 5.5, P = 0.00051) of the amplified exon 9 region was found in patients (22 out of 432) compared to controls (4 of 414). Analyzing patient subgroups, GSK3B structural variants were found to be risk factors of BP particularly (P = 0.00001) with an odds ratio of 8.1 while no such effect was shown in the MDD group. The highest odds (19.7 ratio) for bipolar disorder was observed in females with the amplified exon 9 region. A more detailed analysis of the identified GSK3B CNV by a set of probes covering the GSK3B gene and the adjacent NR1I2 and C3orf15 genes showed that the amplified sequences contained 3' (downstream) segments of the GSK3B and NR1I2 genes but none of them involved the C3orf15 gene. Therefore, the copy number variation of the GSK3B gene could be described as a complex set of structural variants involving partial duplications and deletions, simultaneously. In summary, here we confirmed significant association of the GSK3B CNV and bipolar disorder pointing out that the copy number and extension of the CNV varies among individuals.
authors.affiliation: Institute of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, Budapest, Hungary.
authors.forename: Zsolt
authors.initials: Z
authors.lastname: Ronai
authors.forename: Reka
authors.initials: R
authors.lastname: Kovacs-Nagy
authors.forename: Eszter
authors.initials: E
authors.lastname: Szantai
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Elek
authors.forename: Maria
authors.initials: M
authors.lastname: Sasvari-Szekely
authors.forename: Gabor
authors.initials: G
authors.lastname: Faludi
authors.forename: Judit
authors.initials: J
authors.lastname: Benkovits
authors.forename: Janos M
authors.initials: JM
authors.lastname: Rethelyi
authors.forename: Anna
authors.initials: A
authors.lastname: Szekely
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001714:Bipolar Disorder / Q000235:genetics*; D056915:DNA Copy Number Variations / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D038362:Glycogen Synthase Kinase 3 / Q000235:genetics*; D000071679:Glycogen Synthase Kinase 3 beta; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D012307:Risk Factors; D055815:Young Adult
chemical_list: C000605506:GSK3B protein, human; D000071679:Glycogen Synthase Kinase 3 beta; D038362:Glycogen Synthase Kinase 3
keywords: GSK3B; bipolar depression; copy number variation; glycogen synthase kinase 3 beta; major depression; structural variants