Travis T Mallard1, Jeanne E Savage1, Emma C Johnson1, Yuye Huang1, Alexis C Edwards1, Jouke J Hottenga1, Andrew D Grotzinger1, Daniel E Gustavson1, Mariela V Jennings1, Andrey Anokhin1, Danielle M Dick1, Howard J Edenberg1, John R Kramer1, Dongbing Lai1, Jacquelyn L Meyers1, Ashwini K Pandey1, Kathryn Paige Harden1, Michel G Nivard1, Eco J C de Geus1, Dorret I Boomsma1, Arpana Agrawal1, Lea K Davis1, Toni-Kim Clarke1, Abraham A Palmer1, Sandra Sanchez-Roige1. 1. Department of Psychology, University of Texas at Austin (Mallard, Grotzinger, Harden); Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam (Savage); Department of Psychiatry, Washington University School of Medicine, Saint Louis (Johnson, Anokhin, Agrawal); Department of Psychiatry (Huang, Jennings, Palmer, Sanchez-Roige) and Institute for Genomic Medicine (Palmer), University of California San Diego, La Jolla; Virginia Institute for Psychiatric and Behavioral Genetics, Richmond (Edwards); Department of Biological Psychiatry, Vrije Universiteit Amsterdam (Hottenga, Nivard, de Geus, Boomsma); Department of Medicine, Division of Genetic Medicine, Vanderbilt University Medical Center, Nashville, Tenn. (Gustavson, Davis, Sanchez-Roige); Department of Psychology, Virginia Commonwealth University, Richmond (Dick); Department of Biochemistry and Molecular Biology (Edenberg) and Department of Medical and Molecular Genetics (Lai), Indiana University School of Medicine, Indianapolis; Department of Psychiatry, Carver College of Medicine, University of Iowa, Iowa City (Kramer); Department of Psychiatry and Behavioral Sciences, SUNY Downstate Health Sciences University, Brooklyn, N.Y. (Meyers, Pandey); Department of Psychiatry and Behavioral Sciences and Department of Biomedical Informatics, Vanderbilt University Medical Center, Nashville, Tenn. (Davis); Division of Psychiatry, University of Edinburgh, Edinburgh, U.K. (Clarke).
Abstract
OBJECTIVE: Genome-wide association studies (GWASs) of the Alcohol Use Disorders Identification Test (AUDIT), a 10-item screen for alcohol use disorder (AUD), have elucidated novel loci for alcohol consumption and misuse. However, these studies also revealed that GWASs can be influenced by numerous biases (e.g., measurement error, selection bias), which may have led to inconsistent genetic correlations between alcohol involvement and AUD, as well as paradoxically negative genetic correlations between alcohol involvement and psychiatric disorders and/or medical conditions. The authors used genomic structural equation modeling to elucidate the genetics of alcohol consumption and problematic consequences of alcohol use as measured by AUDIT. METHODS: To explore these unexpected differences in genetic correlations, the authors conducted the first item-level and the largest GWAS of AUDIT items (N=160,824) and applied a multivariate framework to mitigate previous biases. RESULTS: The authors identified novel patterns of similarity (and dissimilarity) among the AUDIT items and found evidence of a correlated two-factor structure at the genetic level ("consumption" and "problems," rg=0.80). Moreover, by applying empirically derived weights to each of the AUDIT items, the authors constructed an aggregate measure of alcohol consumption that was strongly associated with alcohol dependence (rg=0.67), moderately associated with several other psychiatric disorders, and no longer positively associated with health and positive socioeconomic outcomes. Lastly, by conducting polygenic analyses in three independent cohorts that differed in their ascertainment and prevalence of AUD, the authors identified novel genetic associations between alcohol consumption, alcohol misuse, and health. CONCLUSIONS: This work further emphasizes the value of AUDIT for both clinical and genetic studies of AUD and the importance of using multivariate methods to study genetic associations that are more closely related to AUD.
OBJECTIVE: Genome-wide association studies (GWASs) of the Alcohol Use Disorders Identification Test (AUDIT), a 10-item screen for alcohol use disorder (AUD), have elucidated novel loci for alcohol consumption and misuse. However, these studies also revealed that GWASs can be influenced by numerous biases (e.g., measurement error, selection bias), which may have led to inconsistent genetic correlations between alcohol involvement and AUD, as well as paradoxically negative genetic correlations between alcohol involvement and psychiatric disorders and/or medical conditions. The authors used genomic structural equation modeling to elucidate the genetics of alcohol consumption and problematic consequences of alcohol use as measured by AUDIT. METHODS: To explore these unexpected differences in genetic correlations, the authors conducted the first item-level and the largest GWAS of AUDIT items (N=160,824) and applied a multivariate framework to mitigate previous biases. RESULTS: The authors identified novel patterns of similarity (and dissimilarity) among the AUDIT items and found evidence of a correlated two-factor structure at the genetic level ("consumption" and "problems," rg=0.80). Moreover, by applying empirically derived weights to each of the AUDIT items, the authors constructed an aggregate measure of alcohol consumption that was strongly associated with alcohol dependence (rg=0.67), moderately associated with several other psychiatric disorders, and no longer positively associated with health and positive socioeconomic outcomes. Lastly, by conducting polygenic analyses in three independent cohorts that differed in their ascertainment and prevalence of AUD, the authors identified novel genetic associations between alcohol consumption, alcohol misuse, and health. CONCLUSIONS: This work further emphasizes the value of AUDIT for both clinical and genetic studies of AUD and the importance of using multivariate methods to study genetic associations that are more closely related to AUD.
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