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Genetic and Neuroimaging Approaches to Understanding Post-Traumatic Stress Disorder. Int J Mol Sci 2020; 21:ijms21124503. [PMID: 32599917 PMCID: PMC7352752 DOI: 10.3390/ijms21124503] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 05/12/2020] [Accepted: 05/14/2020] [Indexed: 12/15/2022] Open
Abstract
Post-traumatic stress disorder (PTSD) is a highly disabling condition, increasingly recognized as both a disorder of mental health and social burden, but also as an anxiety disorder characterized by fear, stress, and negative alterations in mood. PTSD is associated with structural, metabolic, and molecular changes in several brain regions and the neural circuitry. Brain areas implicated in the traumatic stress response include the amygdala, hippocampus, and prefrontal cortex, which play an essential role in memory function. Abnormalities in these brain areas are hypothesized to underlie symptoms of PTSD and other stress-related psychiatric disorders. Conventional methods of studying PTSD have proven to be insufficient for diagnosis, measurement of treatment efficacy, and monitoring disease progression, and currently, there is no diagnostic biomarker available for PTSD. A deep understanding of cutting-edge neuroimaging genetic approaches is necessary for the development of novel therapeutics and biomarkers to better diagnose and treat the disorder. A current goal is to understand the gene pathways that are associated with PTSD, and how those genes act on the fear/stress circuitry to mediate risk vs. resilience for PTSD. This review article explains the rationale and practical utility of neuroimaging genetics in PTSD and how the resulting information can aid the diagnosis and clinical management of patients with PTSD.
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Fani N, Michopoulos V, van Rooij SJ, Clendinen C, Hardy RA, Jovanovic T, Rothbaum BO, Ressler KJ, Stevens JS. Structural connectivity and risk for anhedonia after trauma: A prospective study and replication. J Psychiatr Res 2019; 116:34-41. [PMID: 31181391 PMCID: PMC7039326 DOI: 10.1016/j.jpsychires.2019.05.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 03/22/2019] [Accepted: 05/09/2019] [Indexed: 01/22/2023]
Abstract
Anhedonia emerges in some people after psychological trauma, reflected by a loss of interest, diminished affect, and detachment. Structural abnormalities in specific neural pathways at the time of trauma may influence the development of these posttraumatic anhedonia (PTA) symptoms. In this prospective study, we determined whether white matter connectivity at around one month post-trauma predicts PTA and other PTSD symptoms at six months post-trauma. Thirty men and women aged 19-62 were recruited from the emergency department of a Level I trauma center. Participants received diffusion tensor imaging at approximately one month post-trauma and clinical assessments at one and six months post-trauma. Probabilistic tractography was used to examine connectivity of select pathways. A replication sample (N = 57) in an independent, cross-sectional dataset of traumatized women was similarly analyzed. Logistic regression results indicated that, after accounting for early PTSD symptoms (at one month) and other clinical risk factors, the integrity of the uncinate fasciculus (UF) uniquely predicted the presence of PTA at six months post-trauma (Beta = -225.6, p < .05). Together, these factors contributed to 76% of the variance in PTA. Integrity of the UF also predicted re-experiencing PTSD symptoms at six months post-trauma. These results were supported in our replication analyses. Our findings indicate that the integrity of the UF around 1 month post-trauma affects vulnerability for the development of anhedonic PTSD symptoms as well as re-experiencing symptoms. Connectivity of this amygdala-ventromedial prefrontal pathway appears to be a salient predictor of anhedonia, above and beyond clinical risk factors.
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Affiliation(s)
- Negar Fani
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA.
| | - Vasiliki Michopoulos
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA,Yerkes National Primate Research Center, Atlanta, GA, USA
| | - Sanne J.H. van Rooij
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA
| | - Cherita Clendinen
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA
| | - Raven A. Hardy
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA
| | - Tanja Jovanovic
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA
| | - Barbara O. Rothbaum
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA
| | - Kerry J. Ressler
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA,McLean Hospital, Harvard Medical School, USA
| | - Jennifer S. Stevens
- Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, USA
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3
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Sharma S, Ressler KJ. Genomic updates in understanding PTSD. Prog Neuropsychopharmacol Biol Psychiatry 2019; 90:197-203. [PMID: 30452941 PMCID: PMC6431237 DOI: 10.1016/j.pnpbp.2018.11.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 11/07/2018] [Accepted: 11/16/2018] [Indexed: 12/14/2022]
Abstract
Twin studies as well as more recent genetics-based heritability analyses demonstrate that up to 40 to 50% of the variance in predicting PTSD following trauma is heritable. However, most of the specific gene pathways and mechanism that mediate risk vs. resilience for PTSD following trauma exposure have yet to be elucidated. This review will examine the latest results from large scale Genome-wide association studies as well as other approaches aimed at understanding mechanisms of development of and recovery from PTSD.
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Affiliation(s)
- Sumeet Sharma
- Neuroscience Program, Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA, United States; McLean Hospital, Division of Depression and Anxiety, Belmont, MA, United States
| | - Kerry J Ressler
- McLean Hospital, Division of Depression and Anxiety, Belmont, MA, United States; Harvard Medical School, Boston, MA, United States; Neuroscience Program, Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA, United States.
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4
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Fenster RJ, Lebois LAM, Ressler KJ, Suh J. Brain circuit dysfunction in post-traumatic stress disorder: from mouse to man. Nat Rev Neurosci 2018; 19:535-551. [PMID: 30054570 PMCID: PMC6148363 DOI: 10.1038/s41583-018-0039-7] [Citation(s) in RCA: 234] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Post-traumatic stress disorder (PTSD) is a prevalent, debilitating and sometimes deadly consequence of exposure to severe psychological trauma. Although effective treatments exist for some individuals, they are limited. New approaches to intervention, treatment and prevention are therefore much needed. In the past few years, the field has rapidly developed a greater understanding of the dysfunctional brain circuits underlying PTSD, a shift in understanding that has been made possible by technological revolutions that have allowed the observation and perturbation of the macrocircuits and microcircuits thought to underlie PTSD-related symptoms. These advances have allowed us to gain a more translational knowledge of PTSD, have provided further insights into the mechanisms of risk and resilience and offer promising avenues for therapeutic discovery.
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Affiliation(s)
- Robert J Fenster
- Division of Depression and Anxiety Disorders, McLean Hospital Department of Psychiatry, Harvard Medical School, Belmont, MA, USA
| | - Lauren A M Lebois
- Division of Depression and Anxiety Disorders, McLean Hospital Department of Psychiatry, Harvard Medical School, Belmont, MA, USA
| | - Kerry J Ressler
- Division of Depression and Anxiety Disorders, McLean Hospital Department of Psychiatry, Harvard Medical School, Belmont, MA, USA.
| | - Junghyup Suh
- Division of Depression and Anxiety Disorders, McLean Hospital Department of Psychiatry, Harvard Medical School, Belmont, MA, USA.
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5
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Nievergelt CM, Ashley-Koch AE, Dalvie S, Hauser MA, Morey RA, Smith AK, Uddin M. Genomic Approaches to Posttraumatic Stress Disorder: The Psychiatric Genomic Consortium Initiative. Biol Psychiatry 2018; 83:831-839. [PMID: 29555185 PMCID: PMC5915904 DOI: 10.1016/j.biopsych.2018.01.020] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 12/18/2017] [Accepted: 01/18/2018] [Indexed: 10/18/2022]
Abstract
Posttraumatic stress disorder (PTSD) after exposure to a traumatic event is a highly prevalent psychiatric disorder. Heritability estimates from twin studies as well as from recent molecular data (single nucleotide polymorphism-based heritability) indicate moderate to high heritability, yet robust genetic variants for PTSD have not yet been identified and the genetic architecture of this polygenic disorder remains largely unknown. To date, fewer than 10 large-scale genome-wide association studies of PTSD have been published, with findings that highlight the unique challenges for PTSD genomics, including a complex diagnostic entity with contingency of PTSD diagnosis on trauma exposure and the large genetic diversity of the study populations. The Psychiatric Genomics Consortium PTSD group has brought together more than 200 scientists with the goal to increase sample size for genome-wide association studies and other genomic analyses to sufficient numbers where robust discoveries of molecular signatures can be achieved. The sample currently includes more than 32,000 PTSD cases and 100,000 trauma-exposed control subjects, and collection is ongoing. The first results found a significant shared genetic risk of PTSD with other psychiatric disorders and sex-biased heritability estimates with higher heritability in female individuals compared with male individuals. This review describes the scope and current focus of the Psychiatric Genomics Consortium PTSD group and its expansion from the initial genome-wide association study group to nine working groups, including epigenetics, gene expression, imaging, and integrative systems biology. We further briefly outline recent findings and future directions of "omics"-based studies of PTSD, with the ultimate goal of elucidating the molecular architecture of this complex disorder to improve prevention and intervention strategies.
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Affiliation(s)
- Caroline M. Nievergelt
- University of California San Diego, Department of Psychiatry and Department of Family Medicine and Public Health,Veterans Affairs San Diego Healthcare System and Veterans Affairs Center of Excellence for Stress and Mental Health
| | | | - Shareefa Dalvie
- Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa, 7925
| | - Michael A. Hauser
- Department of Medicine, Duke University Medical Center, Durham, NC, United States
| | - Rajendra A. Morey
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham NC 27710, Durham VA Medical Center, Durham, NC 27705
| | - Alicia K. Smith
- Emory University, Department of Gynecology and Obstetrics,Emory University, Department of Psychiatry & Behavioral Sciences
| | - Monica Uddin
- University of Illinois Urbana-Champaign, Carl R. Woese Institute for Genomic Biology,University of Illinois Urbana-Champaign, Department of Psychology
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6
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Cattaneo A, Cattane N, Malpighi C, Czamara D, Suarez A, Mariani N, Kajantie E, Luoni A, Eriksson JG, Lahti J, Mondelli V, Dazzan P, Räikkönen K, Binder EB, Riva MA, Pariante CM. FoxO1, A2M, and TGF-β1: three novel genes predicting depression in gene X environment interactions are identified using cross-species and cross-tissues transcriptomic and miRNomic analyses. Mol Psychiatry 2018; 23:2192-2208. [PMID: 29302075 PMCID: PMC6283860 DOI: 10.1038/s41380-017-0002-4] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 09/09/2017] [Accepted: 10/16/2017] [Indexed: 01/02/2023]
Abstract
To date, gene-environment (GxE) interaction studies in depression have been limited to hypothesis-based candidate genes, since genome-wide (GWAS)-based GxE interaction studies would require enormous datasets with genetics, environmental, and clinical variables. We used a novel, cross-species and cross-tissues "omics" approach to identify genes predicting depression in response to stress in GxE interactions. We integrated the transcriptome and miRNome profiles from the hippocampus of adult rats exposed to prenatal stress (PNS) with transcriptome data obtained from blood mRNA of adult humans exposed to early life trauma, using a stringent statistical analyses pathway. Network analysis of the integrated gene lists identified the Forkhead box protein O1 (FoxO1), Alpha-2-Macroglobulin (A2M), and Transforming Growth Factor Beta 1 (TGF-β1) as candidates to be tested for GxE interactions, in two GWAS samples of adults either with a range of childhood traumatic experiences (Grady Study Project, Atlanta, USA) or with separation from parents in childhood only (Helsinki Birth Cohort Study, Finland). After correction for multiple testing, a meta-analysis across both samples confirmed six FoxO1 SNPs showing significant GxE interactions with early life emotional stress in predicting depressive symptoms. Moreover, in vitro experiments in a human hippocampal progenitor cell line confirmed a functional role of FoxO1 in stress responsivity. In secondary analyses, A2M and TGF-β1 showed significant GxE interactions with emotional, physical, and sexual abuse in the Grady Study. We therefore provide a successful 'hypothesis-free' approach for the identification and prioritization of candidate genes for GxE interaction studies that can be investigated in GWAS datasets.
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Affiliation(s)
- Annamaria Cattaneo
- Stress, Psychiatry and Immunology Laboratory, Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King's College, London, UK. .,Biological Psychiatry Unit, IRCCS Fatebenefratelli S. Giovanni di Dio, Brescia, Italy.
| | - Nadia Cattane
- grid.419422.8Biological Psychiatry Unit, IRCCS Fatebenefratelli S. Giovanni di Dio, Brescia, Italy
| | - Chiara Malpighi
- grid.419422.8Biological Psychiatry Unit, IRCCS Fatebenefratelli S. Giovanni di Dio, Brescia, Italy
| | - Darina Czamara
- 0000 0000 9497 5095grid.419548.5Department of Translational Research in Psychiatry, Max-Planck Institute of Psychiatry, Munich, Germany
| | - Anna Suarez
- 0000 0004 0410 2071grid.7737.4Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland
| | - Nicole Mariani
- 0000 0001 2322 6764grid.13097.3cStress, Psychiatry and Immunology Laboratory, Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - Eero Kajantie
- 0000 0001 1013 0499grid.14758.3fNational Institute for Health and Welfare, Helsinki, Finland ,0000 0004 0409 6302grid.428673.cFolkhälsan Research Centre, Helsinki, Finland ,0000 0001 1013 0499grid.14758.3fNational Institute for Health and Welfare, Helsinki, Finland ,0000 0004 0410 2071grid.7737.4Department of General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Alessia Luoni
- 0000 0004 1757 2822grid.4708.bDepartment of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy
| | - Johan G. Eriksson
- 0000 0001 1013 0499grid.14758.3fNational Institute for Health and Welfare, Helsinki, Finland ,0000 0000 9950 5666grid.15485.3dHospital for Children and Adolescents, Helsinki University Hospital and University of Helsinki, Helsinki, Finland ,0000 0004 4685 4917grid.412326.0PEDEGO Research Unit, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Jari Lahti
- 0000 0004 0410 2071grid.7737.4Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland ,0000 0004 0409 6302grid.428673.cFolkhälsan Research Centre, Helsinki, Finland ,0000 0001 1013 0499grid.14758.3fNational Institute for Health and Welfare, Helsinki, Finland ,Helsinki Collegium for Advanced Studies, Helsinki, Finland
| | - Valeria Mondelli
- 0000 0001 2322 6764grid.13097.3cStress, Psychiatry and Immunology Laboratory, Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - Paola Dazzan
- 0000 0001 2322 6764grid.13097.3cDepartment of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Katri Räikkönen
- 0000 0004 0410 2071grid.7737.4Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland
| | - Elisabeth B. Binder
- 0000 0000 9497 5095grid.419548.5Department of Translational Research in Psychiatry, Max-Planck Institute of Psychiatry, Munich, Germany ,0000 0001 0941 6502grid.189967.8Department of Psychiatry & Behavioral Sciences, Emory University School of Medicine, Atlanta, GA USA
| | - Marco A. Riva
- 0000 0004 1757 2822grid.4708.bDepartment of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy
| | - Carmine M. Pariante
- 0000 0001 2322 6764grid.13097.3cStress, Psychiatry and Immunology Laboratory, Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
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7
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Ratanatharathorn A, Boks MP, Maihofer AX, Aiello AE, Amstadter AB, Ashley-Koch AE, Baker DG, Beckham JC, Bromet E, Dennis M, Garrett ME, Geuze E, Guffanti G, Hauser MA, Kilaru V, Kimbrel NA, Koenen KC, Kuan PF, Logue MW, Luft BJ, Miller MW, Mitchell C, Nugent NR, Ressler KJ, Rutten BPF, Stein MB, Vermetten E, Vinkers CH, Youssef NA, Nievergelt CM, Smith AK, Smith AK. Epigenome-wide association of PTSD from heterogeneous cohorts with a common multi-site analysis pipeline. Am J Med Genet B Neuropsychiatr Genet 2017; 174:619-630. [PMID: 28691784 PMCID: PMC5592721 DOI: 10.1002/ajmg.b.32568] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 06/12/2017] [Indexed: 01/31/2023]
Abstract
Compelling evidence suggests that epigenetic mechanisms such as DNA methylation play a role in stress regulation and in the etiologic basis of stress related disorders such as Post traumatic Stress Disorder (PTSD). Here we describe the purpose and methods of an international consortium that was developed to study the role of epigenetics in PTSD. Inspired by the approach used in the Psychiatric Genomics Consortium, we brought together investigators representing seven cohorts with a collective sample size of N = 1147 that included detailed information on trauma exposure, PTSD symptoms, and genome-wide DNA methylation data. The objective of this consortium is to increase the analytical sample size by pooling data and combining expertise so that DNA methylation patterns associated with PTSD can be identified. Several quality control and analytical pipelines were evaluated for their control of genomic inflation and technical artifacts with a joint analysis procedure established to derive comparable data over the cohorts for meta-analysis. We propose methods to deal with ancestry population stratification and type I error inflation and discuss the advantages and disadvantages of applying robust error estimates. To evaluate our pipeline, we report results from an epigenome-wide association study (EWAS) of age, which is a well-characterized phenotype with known epigenetic associations. Overall, while EWAS are highly complex and subject to similar challenges as genome-wide association studies (GWAS), we demonstrate that an epigenetic meta-analysis with a relatively modest sample size can be well-powered to identify epigenetic associations. Our pipeline can be used as a framework for consortium efforts for EWAS.
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Affiliation(s)
| | - Marco P Boks
- University Medical Center Utrecht, Brain Center Rudolf Magnus
| | - Adam X Maihofer
- University of California San Diego, Department of Psychiatry
| | | | | | | | - Dewleen G Baker
- University of California San Diego, Department of Psychiatry,Veterans Affairs San Diego Healthcare System,Veterans Affairs Center of Excellence for Stress and Mental Health
| | - Jean C Beckham
- VA Mid-Atlantic, Mental Illness Research, Education, and Clinical Center,Durham VA Medical Center,Duke University Medical Center, Department of Psychiatry and Behavioral Sciences
| | - Evelyn Bromet
- State University of New York, Epidemiology Research Group
| | - Michelle Dennis
- VA Mid-Atlantic, Mental Illness Research, Education, and Clinical Center,Duke University Medical Center, Department of Psychiatry and Behavioral Sciences
| | | | - Elbert Geuze
- University Medical Center Utrecht, Brain Center Rudolf Magnus,Military Mental Healthcare- Research Centre, Ministry of Defence
| | - Guia Guffanti
- McLean Hospital, Neurobiology of Fear Laboratory,Harvard T.H. Chan School of Public Health, Department of Epidemiology and Massachusetts General Hospital, Department of Psychiatry
| | | | - Varun Kilaru
- Emory University, Department of Gynecology and Obstetrics
| | - Nathan A Kimbrel
- VA Mid-Atlantic, Mental Illness Research, Education, and Clinical Center,Durham VA Medical Center,Duke University Medical Center, Department of Psychiatry and Behavioral Sciences
| | - Karestan C Koenen
- Harvard T.H. Chan School of Public Health, Department of Epidemiology,Massachusetts General Hospital, Psychiatric and Neurodevelopmental Genetics Unit, Center for Human Genetic Research, and Department of Psychiatry,Broad Institute of MIT and Harvard, Stanley Center for Psychiatric Research
| | - Pei-Fen Kuan
- Stony Brook University, Department of Applied Mathematics and Statistics
| | - Mark W Logue
- Boston University, Department of Medicine (Biomedical Genetics),VA Boston Healthcare System
| | | | - Mark W Miller
- VA Boston Healthcare System,Boston University School of Medicine, Department of Psychiatry
| | | | - Nicole R Nugent
- Brown University, Psychiatry and Human Behavior, Department of Pediatric Research
| | - Kerry J Ressler
- McLean Hospital, Neurobiology of Fear Laboratory,Harvard T.H. Chan School of Public Health, Department of Epidemiology and Massachusetts General Hospital, Department of Psychiatry,Emory University, Department of Psychiatry & Behavioral Sciences
| | - Bart P F Rutten
- Maastricht University Medical Centre, School for Mental Health and Neuroscience, Department of Psychiatry and Neuropsychology
| | - Murray B Stein
- University of California San Diego, Department of Psychiatry,Veterans Affairs San Diego Healthcare System,University of California San Diego, Department of Family Medicine and Public Health
| | - Eric Vermetten
- University Medical Center Utrecht, Brain Center Rudolf Magnus,Leiden University Medical Center, Department of Psychiatry,Ministry of Defence, Military Mental Healthcare,Arq Psychotrauma Expert Group
| | | | - Nagy A Youssef
- Medical College of Georgia at Augusta University, Department of Psychiatry and Human Behavior and Office of Academic Affairs
| | | | | | - Caroline M Nievergelt
- University of California San Diego, Department of Psychiatry,Veterans Affairs San Diego Healthcare System,Veterans Affairs Center of Excellence for Stress and Mental Health
| | - Alicia K Smith
- Emory University, Department of Gynecology and Obstetrics,Emory University, Department of Psychiatry & Behavioral Sciences
| | - Alicia K Smith
- Department of Gynecology and Obstetrics, Emory University, Atlanta, Georgia.,Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia
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8
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Mez J, Chung J, Jun G, Kriegel J, Bourlas AP, Sherva R, Logue MW, Barnes LL, Bennett DA, Buxbaum JD, Byrd GS, Crane PK, Ertekin-Taner N, Evans D, Fallin MD, Foroud T, Goate A, Graff-Radford NR, Hall KS, Kamboh MI, Kukull WA, Larson EB, Manly JJ, Haines JL, Mayeux R, Pericak-Vance MA, Schellenberg GD, Lunetta KL, Farrer LA. Two novel loci, COBL and SLC10A2, for Alzheimer's disease in African Americans. Alzheimers Dement 2017; 13:119-129. [PMID: 27770636 PMCID: PMC5318231 DOI: 10.1016/j.jalz.2016.09.002] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 08/24/2016] [Accepted: 09/09/2016] [Indexed: 11/28/2022]
Abstract
INTRODUCTION African Americans' (AAs) late-onset Alzheimer's disease (LOAD) genetic risk profile is incompletely understood. Including clinical covariates in genetic analyses using informed conditioning might improve study power. METHODS We conducted a genome-wide association study (GWAS) in AAs employing informed conditioning in 1825 LOAD cases and 3784 cognitively normal controls. We derived a posterior liability conditioned on age, sex, diabetes status, current smoking status, educational attainment, and affection status, with parameters informed by external prevalence information. We assessed association between the posterior liability and a genome-wide set of single-nucleotide polymorphisms (SNPs), controlling for APOE and ABCA7, identified previously in a LOAD GWAS of AAs. RESULTS Two SNPs at novel loci, rs112404845 (P = 3.8 × 10-8), upstream of COBL, and rs16961023 (P = 4.6 × 10-8), downstream of SLC10A2, obtained genome-wide significant evidence of association with the posterior liability. DISCUSSION An informed conditioning approach can detect LOAD genetic associations in AAs not identified by traditional GWAS.
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Affiliation(s)
- Jesse Mez
- Department of Neurology, Boston University School of Medicine, Boston, MA, USA; Alzheimer's Disease and CTE Center, Boston University School of Medicine, Boston, MA, USA.
| | - Jaeyoon Chung
- Department of Medicine (Biomedical Genetics), Boston University School of Medicine, Boston, MA, USA
| | - Gyungah Jun
- Department of Medicine (Biomedical Genetics), Boston University School of Medicine, Boston, MA, USA; Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA; Department of Ophthalmology, Boston University School of Medicine, Boston, MA, USA
| | - Joshua Kriegel
- Department of Neurology, Boston University School of Medicine, Boston, MA, USA; Alzheimer's Disease and CTE Center, Boston University School of Medicine, Boston, MA, USA
| | - Alexandra P Bourlas
- Department of Neurology, Boston University School of Medicine, Boston, MA, USA; Alzheimer's Disease and CTE Center, Boston University School of Medicine, Boston, MA, USA
| | - Richard Sherva
- Department of Medicine (Biomedical Genetics), Boston University School of Medicine, Boston, MA, USA
| | - Mark W Logue
- Department of Medicine (Biomedical Genetics), Boston University School of Medicine, Boston, MA, USA; Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA
| | - Lisa L Barnes
- Department of Neurological Sciences, Rush University Medical Center, Chicago, IL, USA
| | - David A Bennett
- Department of Neurological Sciences, Rush University Medical Center, Chicago, IL, USA; Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, IL, USA
| | - Joseph D Buxbaum
- Departments of Neuroscience, Mount Sinai School of Medicine, New York, NY, USA; Department of Genetics and Genomic Sciences, Mount Sinai School of Medicine, New York, NY, USA
| | - Goldie S Byrd
- Department of Biology, North Carolina A & T State University, Greensboro, NC, USA
| | - Paul K Crane
- Department of Medicine, University of Washington, Seattle, WA, USA
| | | | - Denis Evans
- Department of Neurological Sciences, Rush University Medical Center, Chicago, IL, USA
| | - M Daniele Fallin
- Department of Mental Health, Johns Hopkins School of Public Health, Baltimore, MD, USA; Department of Biostatistics, Johns Hopkins School of Public Health, Baltimore, MD, USA; Department of Epidemiology, Johns Hopkins School of Public Health, Baltimore, MD, USA
| | - Tatiana Foroud
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Alison Goate
- Departments of Neuroscience, Mount Sinai School of Medicine, New York, NY, USA; Department of Genetics and Genomic Sciences, Mount Sinai School of Medicine, New York, NY, USA
| | | | - Kathleen S Hall
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA
| | - M Ilyas Kamboh
- Department of Human Genetics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Walter A Kukull
- Department of Epidemiology, University of Washington, Seattle, WA, USA
| | - Eric B Larson
- Group Health, Group Health Research Institute, Seattle, WA, USA
| | - Jennifer J Manly
- Department of Neurology and the Taub Institute, Columbia University, New York, NY, USA
| | - Jonathan L Haines
- Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, OH, USA
| | - Richard Mayeux
- Department of Neurology and the Taub Institute, Columbia University, New York, NY, USA
| | | | - Gerard D Schellenberg
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Kathryn L Lunetta
- Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA
| | - Lindsay A Farrer
- Department of Neurology, Boston University School of Medicine, Boston, MA, USA; Alzheimer's Disease and CTE Center, Boston University School of Medicine, Boston, MA, USA; Department of Medicine (Biomedical Genetics), Boston University School of Medicine, Boston, MA, USA; Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA; Department of Ophthalmology, Boston University School of Medicine, Boston, MA, USA; Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
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9
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Gilpin NW, Weiner JL. Neurobiology of comorbid post-traumatic stress disorder and alcohol-use disorder. GENES BRAIN AND BEHAVIOR 2016; 16:15-43. [PMID: 27749004 DOI: 10.1111/gbb.12349] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 10/03/2016] [Accepted: 10/07/2016] [Indexed: 12/12/2022]
Abstract
Post-traumatic stress disorder (PTSD) and alcohol-use disorder (AUD) are highly comorbid in humans. Although we have some understanding of the structural and functional brain changes that define each of these disorders, and how those changes contribute to the behavioral symptoms that define them, little is known about the neurobiology of comorbid PTSD and AUD, which may be due in part to a scarcity of adequate animal models for examining this research question. The goal of this review is to summarize the current state-of-the-science on comorbid PTSD and AUD. We summarize epidemiological data documenting the prevalence of this comorbidity, review what is known about the potential neurobiological basis for the frequent co-occurrence of PTSD and AUD and discuss successes and failures of past and current treatment strategies. We also review animal models that aim to examine comorbid PTSD and AUD, highlighting where the models parallel the human condition, and we discuss the strengths and weaknesses of each model. We conclude by discussing key gaps in our knowledge and strategies for addressing them: in particular, we (1) highlight the need for better animal models of the comorbid condition and better clinical trial design, (2) emphasize the need for examination of subpopulation effects and individual differences and (3) urge cross-talk between basic and clinical researchers that is reflected in collaborative work with forward and reverse translational impact.
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Affiliation(s)
- N W Gilpin
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA.,Neuroscience Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, LA
| | - J L Weiner
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, USA
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10
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Lebois LAM, Wolff JD, Ressler KJ. Neuroimaging genetic approaches to Posttraumatic Stress Disorder. Exp Neurol 2016; 284:141-152. [PMID: 27109180 DOI: 10.1016/j.expneurol.2016.04.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 04/10/2016] [Accepted: 04/20/2016] [Indexed: 12/16/2022]
Abstract
Neuroimaging genetic studies that associate genetic and epigenetic variation with neural activity or structure provide an opportunity to link genes to psychiatric disorders, often before psychopathology is discernable in behavior. Here we review neuroimaging genetics studies with participants who have Posttraumatic Stress Disorder (PTSD). Results show that genes related to the physiological stress response (e.g., glucocorticoid receptor and activity, neuroendocrine release), learning and memory (e.g., plasticity), mood, and pain perception are tied to neural intermediate phenotypes associated with PTSD. These genes are associated with and sometimes predict neural structure and function in areas involved in attention, executive function, memory, decision-making, emotion regulation, salience of potential threats, and pain perception. Evidence suggests these risk polymorphisms and neural intermediate phenotypes are vulnerabilities toward developing PTSD in the aftermath of trauma, or vulnerabilities toward particular symptoms once PTSD has developed. Work distinguishing between the re-experiencing and dissociative sub-types of PTSD, and examining other PTSD symptom clusters in addition to the re-experiencing and hyperarousal symptoms, will further clarify neurobiological mechanisms and inconsistent findings. Furthermore, an exciting possibility is that genetic associations with PTSD may eventually be understood through differential intermediate phenotypes of neural circuit structure and function, possibly underlying the different symptom clusters seen within PTSD.
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Affiliation(s)
- Lauren A M Lebois
- Department of Depression and Anxiety, McLean Hospital, Belmont, MA, United States; Department of Psychiatry, Harvard Medical School, Boston, MA, United States
| | - Jonathan D Wolff
- Department of Depression and Anxiety, McLean Hospital, Belmont, MA, United States; Department of Psychiatry, Harvard Medical School, Boston, MA, United States
| | - Kerry J Ressler
- Department of Depression and Anxiety, McLean Hospital, Belmont, MA, United States; Department of Psychiatry, Harvard Medical School, Boston, MA, United States.
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11
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Montalvo-Ortiz JL, Gelernter J, Hudziak J, Kaufman J. RDoC and translational perspectives on the genetics of trauma-related psychiatric disorders. Am J Med Genet B Neuropsychiatr Genet 2016; 171B:81-91. [PMID: 26592203 PMCID: PMC4754782 DOI: 10.1002/ajmg.b.32395] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/09/2015] [Indexed: 01/01/2023]
Abstract
Individuals with a history of child abuse are at high risk for depression, anxiety disorders, aggressive behavior, and substance use problems. The goal of this paper is to review studies of the genetics of these stress-related psychiatric disorders. An informative subset of studies that examined candidate gene by environment (GxE) predictors of these psychiatric problems in individuals maltreated as children is reviewed, together with extant genome wide association studies (GWAS). Emerging findings on epigenetic changes associated with adverse early experiences are also reviewed. Meta-analytic support and replicated findings are evident for several genetic risk factors; however, extant research suggests the effects are pleiotropic. Genetic factors are not associated with distinct psychiatric disorders, but rather diverse clinical phenotypes. Research also suggests adverse early life experiences are associated with changes in gene expression of multiple known candidate genes, genes involved in DNA transcription and translation, and genes necessary for brain circuitry development, with changes in gene expression reported in key brain structures implicated in the pathophysiology of psychiatric and substance use disorders. The finding of pleiotropy highlights the value of using the Research Domain Criteria (RDoC) framework in future studies of the genetics of stress-related psychiatric disorders, and not trying simply to link genes to multifaceted clinical syndromes, but to more limited phenotypes that map onto distinct neural circuits. Emerging work in the field of epigenetics also suggests that translational studies that integrate numerous unbiased genome-wide approaches will help to further unravel the genetics of stress-related psychiatric disorders.
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Affiliation(s)
| | - Joel Gelernter
- Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut,Veteran's Administration Connecticut Health Care Center, Newington, Connecticut
| | - James Hudziak
- Vermont Center for Children, Youth, and Families, University of Vermont, Burlington, Vermont
| | - Joan Kaufman
- Center for Child and Family Traumatic Stress, Kennedy Krieger Institute, Baltimore, Maryland,Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, Maryland,Correspondence to: Joan Kaufman, Ph.D., Center for Child and Family Traumatic Stress, Kennedy Krieger Institute, 1750 East Fairmont Street, Baltimore, MD 21231.
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12
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Smoller JW. The Genetics of Stress-Related Disorders: PTSD, Depression, and Anxiety Disorders. Neuropsychopharmacology 2016; 41:297-319. [PMID: 26321314 PMCID: PMC4677147 DOI: 10.1038/npp.2015.266] [Citation(s) in RCA: 248] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 08/05/2015] [Accepted: 08/26/2015] [Indexed: 02/06/2023]
Abstract
Research into the causes of psychopathology has largely focused on two broad etiologic factors: genetic vulnerability and environmental stressors. An important role for familial/heritable factors in the etiology of a broad range of psychiatric disorders was established well before the modern era of genomic research. This review focuses on the genetic basis of three disorder categories-posttraumatic stress disorder (PTSD), major depressive disorder (MDD), and the anxiety disorders-for which environmental stressors and stress responses are understood to be central to pathogenesis. Each of these disorders aggregates in families and is moderately heritable. More recently, molecular genetic approaches, including genome-wide studies of genetic variation, have been applied to identify specific risk variants. In this review, I summarize evidence for genetic contributions to PTSD, MDD, and the anxiety disorders including genetic epidemiology, the role of common genetic variation, the role of rare and structural variation, and the role of gene-environment interaction. Available data suggest that stress-related disorders are highly complex and polygenic and, despite substantial progress in other areas of psychiatric genetics, few risk loci have been identified for these disorders. Progress in this area will likely require analysis of much larger sample sizes than have been reported to date. The phenotypic complexity and genetic overlap among these disorders present further challenges. The review concludes with a discussion of prospects for clinical translation of genetic findings and future directions for research.
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Affiliation(s)
- Jordan W Smoller
- Psychiatric and Neurodevelopmental Genetics Unit, Center for Human Genetic Research, Massachusetts General Hospital, Boston, MA, USA
- Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA
- Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, USA
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13
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Logue MW, Amstadter AB, Baker DG, Duncan L, Koenen KC, Liberzon I, Miller MW, Morey RA, Nievergelt CM, Ressler KJ, Smith AK, Smoller JW, Stein MB, Sumner JA, Uddin M. The Psychiatric Genomics Consortium Posttraumatic Stress Disorder Workgroup: Posttraumatic Stress Disorder Enters the Age of Large-Scale Genomic Collaboration. Neuropsychopharmacology 2015; 40:2287-97. [PMID: 25904361 PMCID: PMC4538342 DOI: 10.1038/npp.2015.118] [Citation(s) in RCA: 105] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 03/10/2015] [Accepted: 03/25/2015] [Indexed: 11/09/2022]
Abstract
The development of posttraumatic stress disorder (PTSD) is influenced by genetic factors. Although there have been some replicated candidates, the identification of risk variants for PTSD has lagged behind genetic research of other psychiatric disorders such as schizophrenia, autism, and bipolar disorder. Psychiatric genetics has moved beyond examination of specific candidate genes in favor of the genome-wide association study (GWAS) strategy of very large numbers of samples, which allows for the discovery of previously unsuspected genes and molecular pathways. The successes of genetic studies of schizophrenia and bipolar disorder have been aided by the formation of a large-scale GWAS consortium: the Psychiatric Genomics Consortium (PGC). In contrast, only a handful of GWAS of PTSD have appeared in the literature to date. Here we describe the formation of a group dedicated to large-scale study of PTSD genetics: the PGC-PTSD. The PGC-PTSD faces challenges related to the contingency on trauma exposure and the large degree of ancestral genetic diversity within and across participating studies. Using the PGC analysis pipeline supplemented by analyses tailored to address these challenges, we anticipate that our first large-scale GWAS of PTSD will comprise over 10 000 cases and 30 000 trauma-exposed controls. Following in the footsteps of our PGC forerunners, this collaboration-of a scope that is unprecedented in the field of traumatic stress-will lead the search for replicable genetic associations and new insights into the biological underpinnings of PTSD.
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Affiliation(s)
- Mark W Logue
- Research, VA Boston Healthcare System, Boston, MA, USA
- Biomedical Genetics, Boston University School of Medicine, Boston, MA, USA
- Biostatistics, Boston University School of Public Health, Boston, MA, USA
| | - Ananda B Amstadter
- Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, Richmond, VA, USA
| | - Dewleen G Baker
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
- VA San Diego Healthcare System, VA Center of Excellence for Stress and Mental Health (CESAMH), La Jolla, CA, USA
| | - Laramie Duncan
- Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, USA
- Analytic and Translational Genetics Unit, Psychiatric and Neurodevelopmental Genetics Unit, Massachusetts General Hospital, Boston, MA, USA
- Medical and Population Genetics Program, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Karestan C Koenen
- Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA
| | - Israel Liberzon
- Department of Psychiatry, University of Michigan, Ann Arbor, MI
- Veterans Affairs Ann Arbor Health System, Ann Arbor, MI, USA
| | - Mark W Miller
- National Center for PTSD, VA Boston Healthcare System, Boston, MA, USA
- Department of Psychiatry, Boston University School of Medicine, Boston, MA, USA
| | - Rajendra A Morey
- Duke-UNC Brain Imaging and Analysis Center, Duke University Medical Center, Durham, NC, USA
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
- Mental Illness Research Education and Clinical Center for Post Deployment Mental Health, Durham VA Medical Center, Durham, NC, USA
| | - Caroline M Nievergelt
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
- VA San Diego Healthcare System, VA Center of Excellence for Stress and Mental Health (CESAMH), La Jolla, CA, USA
| | - Kerry J Ressler
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
- Center for Behavioral Neuroscience, Yerkes National Primate Research Center, Atlanta, GA, USA
- Howard Hughes Medical Institute, Bethesda, MD, USA
| | - Alicia K Smith
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - Jordan W Smoller
- Center of Human Genetics Research, Massachusetts General Hospital, Boston, MA, USA
- Stanley Center for Psychiatric Research, The Broad Institute of Harvard and MIT, Cambridge, MA, USA
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
| | - Murray B Stein
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Jennifer A Sumner
- Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA
| | - Monica Uddin
- Carl R Woese Institute for Genomic Biology, University of Illinois Urbana-Champaign, Urbana, IL, USA
- Department of Psychology, University of Illinois Urbana-Champaign, Champaign, IL, USA
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