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Am J Med Genet B Neuropsychiatr Genet. 2017 Mar;174(2):144-155. doi: 10.1002/ajmg.b.32467. Epub 2016 Jun 27.

Genetic variation in the endocannabinoid system and response to Cognitive Behavior Therapy for child anxiety disorders.

Author information

1
School of Psychology, University of Sussex, Brighton, UK.
2
King's College London, MRC Social, Genetic and Developmental Psychiatry (SGDP) Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK.
3
National Institute for Health Research Biomedical Research Centre, South London and Maudsley National Health Service Trust, Beckenham, UK.
4
Research Institute Child Development and Education, University of Amsterdam, Amsterdam, The Netherlands.
5
School of Psychology and Clinical Language Sciences, University of Reading, Reading, UK.
6
Department of Psychology, Centre for Emotional Health, Macquarie University, Sydney, Australia.
7
MRC Cognition and Brain Sciences Unit, Cambridge, UK.
8
Brain and Mind Research Institute, University of Sydney, Sydney, Australia.
9
Department of Clinical Psychology and Experimental Psychopathology, University of Groningen, Groningen, The Netherlands.
10
Department of Psychology, Ruhr-Universität Bochum, Bochum, Germany.
11
Yale University School of Medicine, Child Study Center, New Haven, Connecticut.
12
Department of Psychology and Behavioural Sciences, Aarhus University, Aarhus, Denmark.
13
Department of Child and Adolescent Psychiatry, Haukeland University Hospital, Bergen, Norway.

Abstract

Extinction learning is an important mechanism in the successful psychological treatment of anxiety. Individual differences in response and relapse following Cognitive Behavior Therapy may in part be explained by variability in the ease with which fears are extinguished or the vulnerability of these fears to re-emerge. Given the role of the endocannabinoid system in fear extinction, this study investigates whether genetic variation in the endocannabinoid system explains individual differences in response to CBT. Children (N = 1,309) with a primary anxiety disorder diagnosis were recruited. We investigated the relationship between variation in the CNR1, CNR2, and FAAH genes and change in primary anxiety disorder severity between pre- and post-treatment and during the follow-up period in the full sample and a subset with fear-based anxiety disorder diagnoses. Change in symptom severity during active treatment was nominally associated (P < 0.05) with two SNPs. During the follow-up period, five SNPs were nominally associated with a poorer treatment response (rs806365 [CNR1]; rs2501431 [CNR2]; rs2070956 [CNR2]; rs7769940 [CNR1]; rs2209172 [FAAH]) and one with a more favorable response (rs6928813 [CNR1]). Within the fear-based subset, the effect of rs806365 survived multiple testing corrections (P < 0.0016). We found very limited evidence for an association between variants in endocannabinoid system genes and treatment response once multiple testing corrections were applied. Larger, more homogenous cohorts are needed to allow the identification of variants of small but statistically significant effect and to estimate effect sizes for these variants with greater precision in order to determine their potential clinical utility. © 2016 The Authors. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics Published by Wiley Periodicals, Inc.

KEYWORDS:

Cognitive Behavior Therapy; anxiety; children; endocannabinoids; fear extinction

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