Allele-Specific Methylation of SPDEF: A Novel Moderator of Psychosocial Stress and Substance Abuse
Nicole Tay1, Christine Macare1, Yun Liu1
1The Centre for Population Neuroscience and Stratified Medicine and SGDP Centre, Institute of Psychiatry, King's College London (Tay, Macare, Ruggeri, Jia, Chu, Biondo, Ing, Quinlan, Desrivières, Barker, Schumann); the Department of Biochemistry and Molecular Biology, MOE Key Laboratory of Metabolism and Molecular Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China (Liu); the Institute of Science and Technology of Brain-Inspired Intelligence, Fudan University, Shanghai, China (Jia); the Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence, Fudan University, Ministry of Education, Shanghai, China (Jia); the School of Life Sciences and Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China (Luo); Uppsala University, Uppsala, Sweden (Sarkysian, Bakalkin); the Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (Banaschewski, Hohmann); the Centre for Neuroimaging Sciences, Institute of Psychiatry, Psychology, and Neuroscience, King's College London (Barker); the Discipline of Psychiatry, School of Medicine and Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin (Bokde, Nees); University Medical Centre Hamburg-Eppendorf, Hamburg, Germany (Bromberg, Büchel); the Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (Flor, Nees); the Department of Psychology, School of Social Sciences, University of Mannheim, Mannheim, Germany (Flor); the Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (Nees); the German Research Foundation, Bonn, Germany (Nees); NeuroSpin, Université Paris-Saclay, Gif-sur-Yvette, France (Frouin, Orfanos); the Departments of Psychiatry and Psychology, University of Vermont, Burlington (Garavan); Sir Peter Mansfield Imaging Centre School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom (Gowland); the Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Charité, Universitätsmedizin Berlin, Berlin (Heinz, Walter); Physikalisch-Technische Bundesanstalt, Braunschweig and Berlin, Berlin (Itterman); the Institut National de la Santé et de la Recherche Médicale, INSERM Unit 1000 "Neuroimaging & Psychiatry," DIGITEO Labs, University Paris Sud-Paris Saclay, University Paris Descartes, Gif sur Yvette, France (Martinot); the Maison de Solenn, Cochin Hospital, Paris, France (Martinot); the Institut National de la Santé et de la Recherche Médicale, University Paris Sud-University Paris Saclay, DIGITEO Labs, Gif sur Yvette, France (Artiges); the Department of Psychiatry, Orsay Hospital, Orsay, France (Artiges); the Bloorview Research Institute, Holland Bloorview Kids Rehabilitation, Hospital and Departments of Psychology and Psychiatry, Bloorview Research Institute, University of Toronto, Toronto ( Paus); the Department of Child and Adolescent Psychiatry and Psychotherapy, University Medical Center Göttingen, Göttingen, Germany (Poustka); the Clinic for Child and Adolescent Psychiatry, Medical University of Vienna, Vienna (Poustka); the Department of Psychiatry and the Neuroimaging Center, Technische Universität Dresden, Dresden, Germany (Fröhner, Smolka); the School of Psychology and the Global Brain Health Institute, Trinity College Dublin, Dublin (Whelan); the Department of Psychiatry, Social Psychiatry, and Psychotherapy, Hannover Medical School, Hannover, Germany (Frieling, Bleich); the Department of Medical Sciences, Molecular Medicine and Science for Life laboratory, Uppsala University, Uppsala, Sweden (Syvänen); and the Department of Clinical Neuroscience, Center for Molecular Medicine, Karolinska Institutet, Stockholm (Rüegg, Ekström).
Objective:
Psychosocial stress is a key risk factor for substance abuse among adolescents. Recently, epigenetic processes such as DNA methylation have emerged as potential mechanisms that could mediate this relationship. The authors conducted a genome-wide methylation analysis to investigate whether differentially methylated regions are associated with psychosocial stress in an adolescent population.
Methods:
A methylome-wide analysis of differentially methylated regions was used to examine a sample of 1,287 14-year-old adolescents (50.7% of them female) from the European IMAGEN study. The Illumina 450k array was used to assess DNA methylation, pyrosequencing was used for technical replication, and linear regression analyses were used to identify associations with psychosocial stress and substance use (alcohol and tobacco). Findings were replicated by pyrosequencing a test sample of 413 participants from the IMAGEN study.
Results:
Hypermethylation in the sterile alpha motif/pointed domain containing the ETS transcription factor (SPDEF) gene locus was associated with a greater number of stressful life events in an allele-dependent way. Among individuals with the minor G-allele, SPDEF methylation moderated the association between psychosocial stress and substance abuse. SPDEF methylation interacted with lifetime stress in gray matter volume in the right cuneus, which in turn was associated with the frequency of alcohol and tobacco use. SPDEF was involved in the regulation of trans-genes linked to substance use.
Conclusions:
Taken together, the study findings describe a novel epigenetic mechanism that helps explain how psychosocial stress exposure influences adolescent substance abuse.
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