Genome-wide genetic overlap between fear-based disorders and generalised anxiety disorder.
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Ter Kuile Abigail R, Mitchell Brittany L, Lee Sang Hyuck, Morneau-Vaillancourt Geneviève, Skelton Megan, Coleman Jonathan R I, Davies Helena L, Mundy Jessica, Peel Alicia J, Hübel Christopher, Davies Molly R, Fürtjes Anna E, Ahmad Zain, Lin Yuhao, Adey Brett N, McGregor Thomas, Palmos Alish, Zvrskovec Johan, Hotopf Matthew, Kalsi Gursharan, Smith Daniel J, Veale David, Walters James T R, Armour Chérie, Hirsch Colette R, McIntosh Andrew M, Wray Naomi R, Medland Sarah E, Byrne Enda M, Martin Nicholas G, Kingston Nathalie, Bradley John R, NIHR BioResource, Breen Gerome, Eley Thalia C
Аннотация
Twin studies reveal high genetic overlap between anxiety disorders and depression, contributing to the internalising spectrum. Some genetic specificity for fear-based anxiety disorders (fear), distinct from general anxiety and depression (distress), has also emerged. Limited datasets with detailed phenotyping across anxiety disorders have restricted most genome-wide association studies (GWAS) to "any anxiety diagnosis". Additional genome-wide evidence to discern genetic differences between fear and distress is required. We conducted GWAS meta-analyses of fear (panic, agoraphobia, specific phobia, social anxiety disorder) and generalised anxiety disorder (GAD), measured using brief single-item and detailed symptom-based diagnoses from three datasets. We explored two control group criteria: phenotype-specific (fear/GAD) or broader anxiety/depression screening. We identified one independent genome-wide significant locus and three gene-level associations with fear (up to 35,523 Ncases; 157,447 Ncontrols). Four genome-wide significant loci and three gene-level associations were identified for GAD (up to 60,879 Ncases; 117,064 Ncontrols). The genetic correlation between fear and GAD was significantly different from unity only when excluding a depression-enriched dataset and using phenotype-specific control screening (rg = 0.87; P = 9.32 × 10-3). Most complex traits had statistically similar genetic correlations with fear and GAD, including depression. Exceptions included general cognitive ability, educational attainment, and coronary artery disease, showing statistically stronger genetic correlations with fear than GAD, while bipolar disorder type I, anorexia nervosa, and neuroticism displayed the opposite pattern. Our findings partially support a distress-fear genetic distinction, but show stronger evidence for an overarching genetic liability to internalising psychopathology driving comorbidity across anxiety disorders and depression.