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Duncan, L.* ; Yilmaz, Z.* ; Gaspar, H.* ; Walters, R.* ; Goldstein, J.I.* ; Anttila, V.* ; Bulik-Sullivan, B.* ; Ripke, S.* ; Thornton, L.M.* ; Hinney, A.* ; Daly, M.* ; Sullivan, P.F.* ; Zeggini, E.* ; Breen, G.* ; Bulik, C.M.* ; Eating Disorders Working Group of the Psychiatric Genomics Consortium (Wichmann, H.-E. ; Tschöp, M.H.)

Significant locus and metabolic genetic correlations revealed in genome-wide association study of anorexia nervosa.

Am. J. Psychiatry 174, 850-858 (2017)
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OBJECTIVE: The authors conducted a genome-wide association study of anorexia nervosa and calculated genetic correlations with a series of psychiatric, educational, and metabolic phenotypes. METHOD: Following uniform quality control and imputation procedures using the 1000 Genomes Project (phase 3) in 12 case-control cohorts comprising 3,495 anorexia nervosa cases and 10,982 controls, the authors performed standard association analysis followed by a meta-analysis across cohorts. Linkage disequilibrium score regression was used to calculate genome-wide common variant heritability (single-nucleotide polymorphism [SNP]-based heritability [h(2)SNP]), partitioned heritability, and genetic correlations (rg) between anorexia nervosa and 159 other phenotypes. RESULTS: Results were obtained for 10,641,224 SNPs and insertion-deletion variants with minor allele frequencies >1% and imputation quality scores >0.6. The h(2)SNP of anorexia nervosa was 0.20 (SE=0.02), suggesting that a substantial fraction of the twin-based heritability arises from common genetic variation. The authors identified one genome-wide significant locus on chromosome 12 (rs4622308) in a region harboring a previously reported type 1 diabetes and autoimmune disorder locus. Significant positive genetic correlations were observed between anorexia nervosa and schizophrenia, neuroticism, educational attainment, and high-density lipoprotein cholesterol, and significant negative genetic correlations were observed between anorexia nervosa and body mass index, insulin, glucose, and lipid phenotypes. CONCLUSIONS: Anorexia nervosa is a complex heritable phenotype for which this study has uncovered the first genome-wide significant locus. Anorexia nervosa also has large and significant genetic correlations with both psychiatric phenotypes and metabolic traits. The study results encourage a reconceptualization of this frequently lethal disorder as one with both psychiatric and metabolic etiology.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Anorexia Nervosa ; Diabetes ; Eating Disorders ; Gwas ; Genetics ; Metabolism
ISSN (print) / ISBN 0002-953X
e-ISSN 1535-7228
Quellenangaben Volume: 174, Issue: 9, Pages: 850-858 Article Number: , Supplement: ,
Publisher American Psychiatric Association
Reviewing status Peer reviewed