Cited by 40Genetic Associations and EpidemiologyNeurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology Research

Polymorphisms in the GAD2 gene‐region are associated with susceptibility for unipolar depression and with a risk factor for anxiety disorders

Unschuld, Paul G., Ising, Marcus, Specht, Michael, Erhardt, Angelika, Ripke, Stephan, Heck, Angela, Kloiber, Stefan, Straub, Verica +4 more·2009·American Journal of Medical Genetics Part B: Neuropsychiatric Genetics

Abstract

Glutamate decarboxylase (GAD) is the rate limiting enzyme for conversion of glutamic acid to gamma‐aminobutyric acid (GABA). The GAD 65 kDa isoform is encoded by the gene GAD2 and is mainly expressed in synaptic terminals. It serves as an apoenzyme, which shows enhanced availability in situations of stress, responding to short‐term demands for GABA. We analyzed 18 single nucleotide polymorphisms (SNPs) in the GAD2‐gene region for associations with psychiatric diagnosis and behavioral inhibition (BI) derived from the personality traits neuroticism and extraversion as defined by the Eysenck Personality Questionaire (EPQ). A total of 268 patients with anxiety disorder (AD), 541 with unipolar depression (MD), and 541 healthy controls were included. We observe associations for five tag‐SNPs with BI in the AD‐ and control samples as well as two additional case–control associations in the MD‐sample. The associated SNPs lie within a 16KB linkage disequilibrium‐block, including putative 5′ GAD2‐promoter‐elements as well as the 3′ end of the gene MYO3A. Using open access mRNA‐expression data, we could show that BI‐associated SNPs appear to be associated with differences in MYO3A‐ but not GAD2 lymphoblastoid‐mRNA expression levels. These results support earlier studies that suggest associations of polymorphisms within the GAD2 locus with anxiety and affective disorders. However, data from expression studies imply that these polymorphisms could tag functional effects on the neighboring gene MYO3A, which is also expressed in the brain, including the cingulate cortex and the amygdala. © 2009 Wiley‐Liss, Inc.

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Crossref · 10.1002/ajmg.b.30938

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Authors
Unschuld, P. G., Ising, M., Specht, M., Erhardt, A., Ripke, S., Heck, A., Kloiber, S., Straub, V., Brueckl, T., Müller‐Myhsok, B., Holsboer, F., & Binder, E. B.
Affiliations
Max Planck Society (DE)
Corresponding author
Unschuld, Paul G.
Venue
American Journal of Medical Genetics Part B: Neuropsychiatric Genetics
Publisher
Wiley
Published
2009-02-19
Volume
150B
Issue
8
Pages
1100-1109
ISSN
  • 1552-4841 (ISSN-L)
  • 1552-485X
OpenAlex
W2042686214
Cited by
40
References
65
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2022: 1 · 2021: 1 · 2020: 1 · 2018: 6 · 2017: 1 · 2016: 6 · 2015: 5 · 2014: 1 · 2013: 7 · 2012: 1
FWCI
1.36
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Medical Genetics Part B Neuropsychiatric Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
Funders
Bundesministerium für Bildung und Forschung
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
GAD-2, glutamic acid decarboxylase, GABA synthesis, major depressive disorder, anxiety disorders, single nucleotide polymorphisms, behavioral inhibition, neuroticism, extraversion, linkage disequilibrium, promoter polymorphism, gene expression, genetic susceptibility
MeSH terms
Anxiety Disorders, Brain Chemistry, Depressive Disorder, Glutamate Decarboxylase, Humans, Polymorphism, Genetic, Surveys and Questionnaires, Risk Factors, RNA, Messenger, Linkage Disequilibrium, Case-Control Studies, Myosin Heavy Chains, Genetic Predisposition to Disease, Polymorphism, Single Nucleotide, Myosin Type III

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