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A functional genetic variation of SLC6A2 repressor hsa-miR-579-3p upregulates sympathetic noradrenergic processes of fear and anxiety

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Item Type:Article
Title:A functional genetic variation of SLC6A2 repressor hsa-miR-579-3p upregulates sympathetic noradrenergic processes of fear and anxiety
Creators Name:Hommers, L.G. and Richter, J. and Yang, Y. and Raab, A. and Baumann, C. and Lang, K. and Schiele, M.A. and Weber, H. and Wittmann, A. and Wolf, C. and Alpers, G.W. and Arolt, V. and Domschke, K. and Fehm, L. and Fydrich, T. and Gerlach, A. and Gloster, A.T. and Hamm, A.O. and Helbig-Lang, S. and Kircher, T. and Lang, T. and Pané-Farré, C.A. and Pauli, P. and Pfleiderer, B. and Reif, A. and Romanos, M. and Straube, B. and Ströhle, A. and Wittchen, H.U. and Frantz, S. and Ertl, G. and Lohse, M.J. and Lueken, U. and Deckert, J.
Abstract:Increased sympathetic noradrenergic signaling is crucially involved in fear and anxiety as defensive states. MicroRNAs regulate dynamic gene expression during synaptic plasticity and genetic variation of microRNAs modulating noradrenaline transporter gene (SLC6A2) expression may thus lead to altered central and peripheral processing of fear and anxiety. In silico prediction of microRNA regulation of SLC6A2 was confirmed by luciferase reporter assays and identified hsa-miR-579-3p as a regulating microRNA. The minor (T)-allele of rs2910931 (MAF(cases) = 0.431, MAF =(controls) 0.368) upstream of MIR579 was associated with panic disorder in patients (p (allelic)= 0.004, n (cases)= 506, n(controls) = 506) and with higher trait anxiety in healthy individuals (p(ASI) = 0.029, p(ACQ) = 0.047, n = 3112). Compared to the major (A)-allele, increased promoter activity was observed in luciferase reporter assays in vitro suggesting more effective MIR579 expression and SLC6A2 repression in vivo (p = 0.041). Healthy individuals carrying at least one (T)-allele showed a brain activation pattern suggesting increased defensive responding and sympathetic noradrenergic activation in midbrain and limbic areas during the extinction of conditioned fear. Panic disorder patients carrying two (T)-alleles showed elevated heart rates in an anxiety-provoking behavioral avoidance test (F(2, 270) = 5.47, p = 0.005). Fine-tuning of noradrenaline homeostasis by a MIR579 genetic variation modulated central and peripheral sympathetic noradrenergic activation during fear processing and anxiety. This study opens new perspectives on the role of microRNAs in the etiopathogenesis of anxiety disorders, particularly their cardiovascular symptoms and comorbidities.
Keywords:Alleles, Anxiety, Brain, Brain Mapping, Classical Conditioning, Fear, Gene Expression Regulation, Genetic Variation, Magnetic Resonance Imaging, MicroRNAs, Norepinephrine, Norepinephrine Plasma Membrane Transport Proteins, Panic Disorder, Psychological Extinction, Single Nucleotide Polymorphism, Sympathetic Nervous System, Up-Regulation
Source:Translational Psychiatry
Publisher:Nature Publishing Group
Page Range:226
Date:19 October 2018
Official Publication:https://doi.org/10.1038/s41398-018-0278-4
PubMed:View item in PubMed

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