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Reproducible Genetic Risk Loci for Anxiety: Results From ~200,000 Participants in the Million Veteran Program.

Levey DF, Gelernter J, Polimanti R, Zhou H, Cheng Z, Aslan M, Quaden R, Concato J, Radhakrishnan K, Bryois J, Sullivan PF, Million Veteran Program , Stein MB. Reproducible Genetic Risk Loci for Anxiety: Results From ~200,000 Participants in the Million Veteran Program. The American journal of psychiatry. 2020 Mar 1; 177(3):223-232.

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OBJECTIVE: Anxiety disorders are common and often disabling. The goal of this study was to examine the genetic architecture of anxiety disorders and anxiety symptoms, which are also frequently comorbid with other mental disorders, such as major depressive disorder. METHODS: Using one of the world's largest biobanks including genetic, environmental, and medical information, the Million Veteran Program, the authors performed a genome-wide association study (GWAS) of a continuous trait for anxiety (based on score on the Generalized Anxiety Disorder 2-item scale [GAD-2], N = 199,611) as the primary analysis and self-report of physician diagnosis of anxiety disorder (N = 224,330) as a secondary analysis. RESULTS: The authors identified five genome-wide significant signals for European Americans and one for African Americans on GAD-2 score. The strongest were on chromosome 3 (rs4603973) near , a global regulator of gene expression, and on chromosome 6 (rs6557168) near , which encodes an estrogen receptor. The locus identified on chromosome 7 (rs56226325, MAF = 0.17) near was previously identified in GWASs of bipolar disorder and schizophrenia. The authors replicated these findings in the summary statistics of two major published GWASs for anxiety, and also found evidence of significant genetic correlation between the GAD-2 score results and previous GWASs for anxiety (r = 0.75), depression (r = 0.81), and neuroticism (r = 0.75). CONCLUSIONS: This is the largest GWAS of anxiety traits to date. The authors identified novel genome-wide significant associations near genes involved with global regulation of gene expression () and the estrogen receptor alpha (). Additionally, the authors identified a locus () that may have implications for genetic vulnerability across several psychiatric disorders. This work provides new insights into genetic risk mechanisms underpinning anxiety and related psychiatric disorders.

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