title: PTSD risk associated with a functional DRD2 polymorphism in heroin-dependent cases and controls is limited to amphetamine-dependent individuals.
abstract: Posttraumatic stress disorder (PTSD), a pathologic response to severe stress, is a common co-morbid disorder in substance-dependent individuals. Evidence from twin studies suggests that PTSD is moderately heritable. Genetic association studies to date have reported a limited number of replicated findings. We conducted a candidate gene association study in trauma-exposed individuals within the Comorbidity and Trauma Study's sample (1343 heroin-dependent cases and 406 controls from economically disadvantaged neighborhoods). After data cleaning, the 1430 single nucleotide polymorphisms (SNPs) retained for analyses provided coverage of 72 candidate genes and included additional SNPs for which association was previously reported as well as 30 ancestry-informative markers. We found a functional DRD2 promoter polymorphism (rs12364283) to be most highly associated with PTSD liability [odds ratio (OR) 1.65 (1.27-2.15); P = 1.58 × 10(-4) ]; however, this association was not significant, with a stringent Bonferroni correction for multiple comparisons. The top hits include SNPs from other dopaminergic system genes: DRD2 DRD3, TH and DBH. Additional analyses revealed that the association involving rs12364283 is largely limited to amphetamine-dependent individuals. Substantial risk is observed in amphetamine-dependent individuals, with at least one copy of this SNP [OR 2.86 (1.92-4.27); P = 2.6 × 10(-7) ]. Further analyses do not support extensive mediation of PTSD risk via self-reported impulsivity (BIS total score). These findings suggest roles for impairment in inhibitory control in the pathophysiology of PTSD and raise questions about stimulant use in certain populations (e.g. those in combat).
authors: Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA.
authors: Elliot C
authors: EC
authors: Nelson
authors: Andrew C
authors: AC
authors: Heath
authors: Michael T
authors: MT
authors: Lynskey
authors: Arpana
authors: A
authors: Agrawal
authors: Anjali K
authors: AK
authors: Henders
authors: Lisa M
authors: LM
authors: Bowdler
authors: Alexandre A
authors: AA
authors: Todorov
authors: Pamela A F
authors: PA
authors: Madden
authors: Elizabeth
authors: E
authors: Moore
authors: Louisa
authors: L
authors: Degenhardt
authors: Nicholas G
authors: NG
authors: Martin
authors: Grant W
authors: GW
authors: Montgomery
mesh_terms: D000328:Adult; D019969:Amphetamine-Related Disorders / Q000150:complications / Q000235:genetics*; D001315:Australia; D016022:Case-Control Studies; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D006556:Heroin Dependence / Q000150:complications / Q000235:genetics*; D006801:Humans; D008297:Male; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D017448:Receptors, Dopamine D2 / Q000235:genetics*; D012306:Risk; D013313:Stress Disorders, Post-Traumatic / Q000150:complications / Q000235:genetics*
chemical_list: C581293:DRD2 protein, human; D017448:Receptors, Dopamine D2
keywords: Amphetamine dependence; DRD2; PTSD; association study
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