1
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Zhang Y, Xu B, Kim HH, Muetzel R, Delaney SW, Tiemeier H. Differences in cortical morphology and child internalizing or externalizing problems: Accounting for the co-occurrence. JCPP ADVANCES 2022; 2:e12114. [PMID: 37431413 PMCID: PMC10242825 DOI: 10.1002/jcv2.12114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 09/13/2022] [Indexed: 09/20/2024] Open
Abstract
Background Childhood internalizing and externalizing problems frequently co-occur. Many studies report neural correlates of either internalizing or externalizing problems, but few account for their co-occurrence. We aimed to assess specific cortical substrates of these psychiatric problems. Methods We used data from 9635 children aged 9-11 years in the baseline Adolescent Brain Cognitive Development Study. Internalizing and externalizing problem composite scales scores were derived from the Child Behavior Checklist. We standardized FreeSurfer-derived volumes of 68 cortical regions. We examined internalizing and externalizing problems separately and jointly (covariate-adjustment) in relation to cortical volumes, with and without adjusting for total brain volume (TBV) in multivariate linear regressions adjusted for demographics and multiple comparisons. We fit bifactor models to confirm the consistency of patterns exploring specific internalizing and specific externalizing problems. Sensitivity analyses included a vertex-wide analysis and a replication in another large population-based study. Results In separate TBV-unadjusted analyses, externalizing and internalizing problems were associated with smaller cortical volumes. If adjusted for externalizing behavior, however, larger cortical volumes were associated with internalizing problems, while smaller cortical volumes remained associated with externalizing problems after adjustment for internalizing problems. The bifactor model produced similar results, which were consistently replicated in another pre-adolescent neuroimaging sample. These associations likely represent global effects: adjusting for TBV rendered most associations non-significant. Vertex-wise analyses confirmed global patterns. Conclusion Our results suggest that internalizing and externalizing problems have globally opposing, and non-specific associations with cortical morphology in childhood, which are only apparent if analyses account for their co-occurrence.
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Affiliation(s)
- Yingzhe Zhang
- Department of EpidemiologyHarvard T.H. Chan School of Public HealthBostonMassachusettsUSA
| | - Bing Xu
- Department of Child and Adolescent Psychiatry/PsychologyErasmus MC University Medical CenterRotterdamThe Netherlands
| | - Hannah H. Kim
- Department of Social and Behavioral SciencesHarvard T.H. Chan School of Public HealthBostonMassachusettsUSA
| | - Ryan Muetzel
- Department of Child and Adolescent Psychiatry/PsychologyErasmus MC University Medical CenterRotterdamThe Netherlands
| | - Scott W. Delaney
- Department of EpidemiologyHarvard T.H. Chan School of Public HealthBostonMassachusettsUSA
- Department of Child and Adolescent Psychiatry/PsychologyErasmus MC University Medical CenterRotterdamThe Netherlands
| | - Henning Tiemeier
- Department of EpidemiologyHarvard T.H. Chan School of Public HealthBostonMassachusettsUSA
- Department of Child and Adolescent Psychiatry/PsychologyErasmus MC University Medical CenterRotterdamThe Netherlands
- Department of Social and Behavioral SciencesHarvard T.H. Chan School of Public HealthBostonMassachusettsUSA
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2
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Kanarik M, Grimm O, Mota NR, Reif A, Harro J. ADHD co-morbidities: A review of implication of gene × environment effects with dopamine-related genes. Neurosci Biobehav Rev 2022; 139:104757. [PMID: 35777579 DOI: 10.1016/j.neubiorev.2022.104757] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 06/25/2022] [Accepted: 06/26/2022] [Indexed: 02/07/2023]
Abstract
ADHD is a major burden in adulthood, where co-morbid conditions such as depression, substance use disorder and obesity often dominate the clinical picture. ADHD has substantial shared heritability with other mental disorders, contributing to comorbidity. However, environmental risk factors exist but their interaction with genetic makeup, especially in relation to comorbid disorders, remains elusive. This review for the first time summarizes present knowledge on gene x environment (GxE) interactions regarding the dopamine system. Hitherto, mainly candidate (GxE) studies were performed, focusing on the genes DRD4, DAT1 and MAOA. Some evidence suggest that the variable number tandem repeats in DRD4 and MAOA may mediate GxE interactions in ADHD generally, and comorbid conditions specifically. Nevertheless, even for these genes, common variants are bound to suggest risk only in the context of gender and specific environments. For other polymorphisms, evidence is contradictory and less convincing. Particularly lacking are longitudinal studies testing the interaction of well-defined environmental with polygenic risk scores reflecting the dopamine system in its entirety.
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Affiliation(s)
- Margus Kanarik
- Chair of Neuropsychopharmacology, Institute of Chemistry, University of Tartu, Ravila 14A Chemicum, 50411 Tartu, Estonia
| | - Oliver Grimm
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany
| | - Nina Roth Mota
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands; Department of Psychiatry, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Andreas Reif
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany
| | - Jaanus Harro
- Chair of Neuropsychopharmacology, Institute of Chemistry, University of Tartu, Ravila 14A Chemicum, 50411 Tartu, Estonia; Psychiatry Clinic, North Estonia Medical Centre, Paldiski Road 52, 10614 Tallinn, Estonia.
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Gerra ML, Gerra MC, Tadonio L, Pellegrini P, Marchesi C, Mattfeld E, Gerra G, Ossola P. Early parent-child interactions and substance use disorder: An attachment perspective on a biopsychosocial entanglement. Neurosci Biobehav Rev 2021; 131:560-580. [PMID: 34606823 DOI: 10.1016/j.neubiorev.2021.09.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 09/28/2021] [Accepted: 09/29/2021] [Indexed: 12/19/2022]
Abstract
This review aims to elucidate environmental and genetic factors, as well as their epigenetic and neuroendocrine moderators, that may underlie the association between early childhood experiences and Substance Use Disorders (SUD), through the lens of parental attachment. Here we review those attachment-related studies that examined the monoaminergic systems, the hypothalamic pituitary adrenal stress response system, the oxytoninergic system, and the endogenous opioid system from a genetic, epigenetic, and neuroendocrine perspective. Overall, the selected studies point to a moderating effect of insecure attachment between genetic vulnerability and SUD, reasonably through epigenetic modifications. Preliminary evidence suggests that vulnerability to SUDs is related with hypo-methylation (e.g. hyper-expression) of high-risk polymorphisms on the monoaminergic and hypothalamic pituitary adrenal system and hyper-methylation (e.g. hypo-expressions) of protective polymorphisms on the opioid and oxytocin system. These epigenetic modifications may induce a cascade of neuroendocrine changes contributing to the subclinical and behavioural manifestations that precede the clinical onset of SUD. Protective and supportive parenting could hence represent a key therapeutic target to prevent addiction and moderate insecure attachment.
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Affiliation(s)
| | - Maria Carla Gerra
- Center for Neuroplasticity and Pain (CNAP), SMI®, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
| | | | | | - Carlo Marchesi
- Psychiatry Unit, Department of Medicine and Surgery, University of Parma, Parma, Italy.
| | - Elizabeth Mattfeld
- Drug Prevention and Health Branch, Prevention Treatment and Rehabilitation Section, United Nations Office on Drugs and Crime, Vienna, Austria.
| | - Gilberto Gerra
- Department of Mental Health, AUSL of Parma, Parma, Italy.
| | - Paolo Ossola
- Center for Neuroplasticity and Pain (CNAP), SMI®, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
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4
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Ruchkin V, Koposov R, Oreland L, af.Klinteberg B, Grigorenko EL. Dopamine-related receptors, substance dependence, behavioral problems and personality among juvenile delinquents. PERSONALITY AND INDIVIDUAL DIFFERENCES 2021. [DOI: 10.1016/j.paid.2020.109849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Kim J, Marciano MA, Ninham S, Zaso MJ, Park A. Interaction Effects between the Cumulative Genetic Score and Psychosocial Stressor on Self-Reported Drinking Urge and Implicit Attentional Bias for Alcohol: A Human Laboratory Study. Alcohol Alcohol 2019; 54:30-37. [PMID: 30192917 DOI: 10.1093/alcalc/agy065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 08/22/2018] [Indexed: 01/27/2023] Open
Abstract
Aims The current candidate gene and environment interaction (cGxE) study examined whether the effects of an experimentally manipulated psychosocial stressor on self-reported drinking urge and implicit attentional bias for alcohol cues differ as a function of a cumulative genetic score of 5-HTTLPR, MAO-A, DRD4, DAT1 and DRD2 genotypes. The current study also examined whether salivary alpha-amylase level or self-reported anxiety state mediate these cGxE effects. Short Summary Individuals with high cumulative genetic risk score of the five monoamergic genotypes showed greater attentional bias toward alcohol cues when exposed to a psychosocial stressor than when not exposed. Methods Frequent binge-drinking Caucasian young adults (N = 105; mean age = 19; 61% male) completed both the control condition and stress condition (using the Trier Social Stress Test) in order. Results Regarding attentional bias, individuals with high and medium cumulative genetic risk scores showed greater attentional bias toward alcohol stimuli in the stress condition than in the control condition, whereas, those with low genetic risk scores showed greater attentional bias toward alcohol stimuli in the control condition than in the stress condition. No mediating roles of salivary alpha-amylase and anxiety state in the cGxE effect were found. Regarding self-reported drinking urge, individuals with high cumulative genetic score reported greater drinking urge than those with low genetic score regardless of experimental conditions. Conclusions Although replication is necessary, the findings suggest that the association of a psychosocial stressor on implicit (but not explicit, self-reported) alcohol outcomes may differ as a function of the collective effects of five monoamine genes.
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Affiliation(s)
- Jueun Kim
- Department of Psychology, Handong Global University, Pohang, South Korea
| | - Michael A Marciano
- Forensic and National Security Sciences Institute, College of Arts and Sciences, Syracuse University, Syracuse, NY, USA
| | - Shyanne Ninham
- Department of Psychology, Syracuse University, Syracuse, NY, USA
| | - Michelle J Zaso
- Department of Psychology, Syracuse University, Syracuse, NY, USA
| | - Aesoon Park
- Department of Psychology, Syracuse University, Syracuse, NY, USA
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Ports KA, Holman DM, Guinn AS, Pampati S, Dyer KE, Merrick MT, Lunsford NB, Metzler M. Adverse Childhood Experiences and the Presence of Cancer Risk Factors in Adulthood: A Scoping Review of the Literature From 2005 to 2015. J Pediatr Nurs 2019; 44:81-96. [PMID: 30683285 PMCID: PMC6355255 DOI: 10.1016/j.pedn.2018.10.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 10/11/2018] [Accepted: 10/12/2018] [Indexed: 02/07/2023]
Abstract
Exposure to Adverse Childhood Experiences (ACEs) is associated with a host of harmful outcomes, including increased risk for cancer. A scoping review was conducted to gain a better understanding of how ACEs have been studied in association with risk factors for cancer. This review includes 155 quantitative, peer-reviewed articles published between 2005 and 2015 that examined associations between ACEs and modifiable cancer risk factors, including alcohol, environmental carcinogens, chronic inflammation, sex hormones, immunosuppression, infectious agents, obesity, radiation, ultraviolet (UV) radiation, and tobacco, among U.S. adults. This review highlights the growing body of research connecting ACEs to cancer risk factors, particularly alcohol, obesity, and tobacco. Fewer studies investigated the links between ACEs and chronic inflammation or infectious agents. No included publications investigated associations between ACEs and environmental carcinogens, hormones, immunosuppression, radiation, or ultraviolet radiation. Mitigating the impact of ACEs may provide innovative ways to effect comprehensive, upstream cancer prevention.
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Affiliation(s)
- Katie A Ports
- Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, GA, USA.
| | - Dawn M Holman
- Division of Cancer Prevention and Control, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA.
| | - Angie S Guinn
- Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, GA, USA.
| | - Sanjana Pampati
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI, USA.
| | - Karen E Dyer
- Virginia Commonwealth University, School of Medicine, Department of Health Behavior and Policy, Richmond, VA, USA.
| | - Melissa T Merrick
- Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, GA, USA.
| | - Natasha Buchanan Lunsford
- Division of Cancer Prevention and Control, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA.
| | - Marilyn Metzler
- Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, GA, USA.
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Kim J, Park A. A systematic review: Candidate gene and environment interaction on alcohol use and misuse among adolescents and young adults. Am J Addict 2018; 27:345-363. [PMID: 29992684 PMCID: PMC6511325 DOI: 10.1111/ajad.12755] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 05/06/2018] [Accepted: 05/17/2018] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Youth drinking is a pervasive public health concern with serious negative developmental implications. Candidate gene and environment interaction studies (cGxE) show that environmental effects on drinking behaviors may differ by individuals' genotypes. Yet little is known about whether genetic and environmental effects on drinking behaviors are developmentally specific. METHODS This systematic review evaluated 42 cGxE studies of drinking in adolescence and young adulthood. RESULTS Although there are mixed findings, studies of cGxE effects involving DRD4, 5-HTTLPR, DRD2, and OPRM1 genotypes showed relatively consistent patterns. The effects of under-controlled environments (eg, low levels of parental monitoring) on early and middle adolescent drinking appeared to differ across DRD2 or OPRM1 genotypes. Effects of alcohol-facilitating environments (eg, heavy drinking peers) on late adolescent and young adult drinking appeared to differ across DRD4 or OPRM1 genotypes. Interactions between 5-HTTLPR genotype with stressful environments (eg, negative life events) were found throughout adolescence and young adulthood, although there were some inconsistencies regarding the risk-conferring allele. There was limited evidence for other cGxE effects due to the small number of studies. CONCLUSIONS AND SCIENTIFIC SIGNIFICANCE This review suggests that GxE findings may advance our knowledge regarding which developmentally specific conditions result in the expression of candidate genes that influence youth alcohol use and misuse. However, since a significant number of studies had small sample sizes and most studies had small effect sizes, findings need replication across independent studies with large samples. (Am J Addict 2018;XX:1-19).
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Affiliation(s)
- Jueun Kim
- Department of Counseling Psychology, Handong Global University, Pohang, South Korea
| | - Aesoon Park
- Department of Psychology, Syracuse University, Syracuse, New York
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8
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Assary E, Vincent JP, Keers R, Pluess M. Gene-environment interaction and psychiatric disorders: Review and future directions. Semin Cell Dev Biol 2017; 77:133-143. [PMID: 29051054 DOI: 10.1016/j.semcdb.2017.10.016] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 10/16/2017] [Accepted: 10/16/2017] [Indexed: 12/11/2022]
Abstract
Empirical studies suggest that psychiatric disorders result from a complex interplay between genetic and environmental factors. Most evidence for such gene-environment interaction (GxE) is based on single candidate gene studies conducted from a Diathesis-Stress perspective. Recognizing the short-comings of candidate gene studies, GxE research has begun to focus on genome-wide and polygenic approaches as well as drawing on different theoretical concepts underlying GxE, such as Differential Susceptibility. After reviewing evidence from candidate GxE studies and presenting alternative theoretical frameworks underpinning GxE research, more recent approaches and findings from whole genome approaches are presented. Finally, we suggest how future GxE studies may unpick the complex interplay between genes and environments in psychiatric disorders.
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Affiliation(s)
- Elham Assary
- Department of Biological and Experimental Psychology, School of Biological and Chemical Sciences, Queen Mary University of London, London, E14NS, United Kingdom.
| | - John Paul Vincent
- Department of Biological and Experimental Psychology, School of Biological and Chemical Sciences, Queen Mary University of London, London, E14NS, United Kingdom.
| | - Robert Keers
- Department of Biological and Experimental Psychology, School of Biological and Chemical Sciences, Queen Mary University of London, London, E14NS, United Kingdom.
| | - Michael Pluess
- Department of Biological and Experimental Psychology, School of Biological and Chemical Sciences, Queen Mary University of London, London, E14NS, United Kingdom.
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9
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Park A, Kim J, Zaso MJ, Glatt SJ, Sher KJ, Scott-Sheldon LAJ, Eckert TL, Vanable PA, Carey KB, Ewart CK, Carey MP. The interaction between the dopamine receptor D4 (DRD4) variable number tandem repeat polymorphism and perceived peer drinking norms in adolescent alcohol use and misuse. Dev Psychopathol 2017; 29:173-183. [PMID: 26902782 PMCID: PMC4995157 DOI: 10.1017/s0954579416000080] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Peer drinking norms are arguably one of the strongest correlates of adolescent drinking. Prospective studies indicate that adolescents tend to select peers based on drinking (peer selection) and their peers' drinking is associated with changes in adolescent drinking over time (peer socialization). The present study investigated whether the peer selection and socialization processes in adolescent drinking differed as a function of the dopamine receptor D4 (DRD4) variable number tandem repeat genotype in two independent prospective data sets. The first sample was 174 high school students drawn from a two-wave 6-month prospective study. The second sample was 237 college students drawn from a three-wave annual prospective study. Multigroup cross-lagged panel analyses of the high school student sample indicated stronger socialization via peer drinking norms among carriers, whereas analyses of the college student sample indicated stronger drinking-based peer selection in the junior year among carriers, compared to noncarriers. Although replication and meta-analytic synthesis are needed, these findings suggest that in part genetically determined peer selection (carriers of the DRD4 seven-repeat allele tend to associate with peers who have more favorable attitudes toward drinking and greater alcohol use) and peer socialization (carriers' subsequent drinking behaviors are more strongly associated with their peer drinking norms) may differ across adolescent developmental stages.
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10
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Sayette MA. The effects of alcohol on emotion in social drinkers. Behav Res Ther 2017; 88:76-89. [PMID: 28110679 PMCID: PMC5724975 DOI: 10.1016/j.brat.2016.06.005] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 06/10/2016] [Accepted: 06/21/2016] [Indexed: 12/28/2022]
Abstract
Understanding why people drink alcohol and in some cases develop drinking problems has long puzzled researchers, clinicians, and patients alike. In the mid-1940s and early 1950s, experimental research began to systematically investigate alcohol's hedonic properties. Presumably, alcohol consumption would prove reinforcing as a consequence of its capacity either to relieve stress or to brighten positive emotional experiences. This article reviews experimental research through the years examining the impact of alcohol on both the relief of negative affect and the enhancement of positive affect. It covers initial accounts that emphasized direct pharmacological effects of ethanol on the central nervous system. These early studies offered surprisingly tepid support for the premise that alcohol improved emotional states. Next, studies conducted in the 1970s are considered. Informed by social learning theory and employing advances derived from experimental psychology, this research sought to better understand the complex effects of alcohol on emotion. Coverage of this work is followed by discussion of current formulations, which integrate biological and behavioral approaches with the study of cognitive, affective, and social processes. These current perspectives provide insight into the particular conditions under which alcohol can boost emotional experiences. Finally, future research directions and clinical implications are considered.
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Affiliation(s)
- Michael A Sayette
- Department of Psychology, University of Pittsburgh, 3137 Sennott Square, 210 S. Bouquet St., Pittsburgh, PA 15260, United States.
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11
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Carlson MD, Harden KP, Kretsch N, Corbin WR, Fromme K. Interactions between DRD4 and developmentally specific environments in alcohol-dependence symptoms. JOURNAL OF ABNORMAL PSYCHOLOGY 2016; 124:1043-9. [PMID: 26595480 DOI: 10.1037/abn0000120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Social experiences may moderate genetic influences on alcohol dependence (AD) symptoms. Consistent with this hypothesis, Park, Sher, Todorov, and Heath (2011) previously reported interactions between the dopamine D4 receptor gene (DRD4) and developmentally specific environments in the etiology of AD symptoms during emerging and young adulthood. Using a longitudinal cohort of n = 367 White participants followed from ages 18 to 27 years, we examine a series of similar interactions between DRD4 and developmentally sensitive contexts including childhood adversity and work and family roles. In contrast to previous results, we observed no significant interactions between DRD4 and childhood adversity. Overall, results further highlight the need for longitudinal studies of Gene × Environment interaction in the behavioral sciences and the difficulty of identifying candidate Gene × Environment interaction effects that are consistent across studies.
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Affiliation(s)
| | | | | | | | - Kim Fromme
- Department of Psychology, University of Texas at Austin
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12
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Hartman S, Belsky J. An Evolutionary Perspective on Family Studies: Differential Susceptibility to Environmental Influences. FAMILY PROCESS 2016; 55:700-712. [PMID: 26133233 DOI: 10.1111/famp.12161] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
An evolutionary perspective of human development provides the basis for the differential-susceptibility hypothesis which stipulates that individuals should differ in their susceptibility to environmental influences, with some being more affected than others by both positive and negative developmental experiences and environmental exposures. This paper reviews evidence consistent with this claim while revealing that temperamental and genetic characteristics play a role in distinguishing more and less susceptible individuals. The differential-susceptibility framework under consideration is contrasted to the traditional diathesis-stress view that "vulnerability" traits predispose some to being disproportionately affected by (only) adverse experiences. We raise several issues stimulated by the literature that need to be clarified in further research. Lastly, we suggest that therapy may differ in its effects depending on an individual's susceptibility.
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Affiliation(s)
- Sarah Hartman
- Department of Human Ecology, University of California, Davis, CA
| | - Jay Belsky
- Department of Human Ecology, University of California, Davis, CA
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14
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Stogner JM, Gibson CL. Genetic Modification of the Relationship between Parental Rejection and Adolescent Alcohol Use. Alcohol Alcohol 2016; 51:442-9. [PMID: 26755638 DOI: 10.1093/alcalc/agv136] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 12/10/2015] [Indexed: 11/12/2022] Open
Abstract
AIMS Parenting practices are associated with adolescents' alcohol consumption, however not all youth respond similarly to challenging family situations and harsh environments. This study examines the relationship between perceived parental rejection and adolescent alcohol use, and specifically evaluates whether youth who possess greater genetic sensitivity to their environment are more susceptible to negative parental relationships. METHODS Analyzing data from the National Longitudinal Study of Adolescent Health, we estimated a series of regression models predicting alcohol use during adolescence. A multiplicative interaction term between parental rejection and a genetic index was constructed to evaluate this potential gene-environment interaction. RESULTS Results from logistic regression analyses show a statistically significant gene-environment interaction predicting alcohol use. The relationship between parental rejection and alcohol use was moderated by the genetic index, indicating that adolescents possessing more 'risk alleles' for five candidate genes were affected more by stressful parental relationships. CONCLUSIONS Feelings of parental rejection appear to influence the alcohol use decisions of youth, but they do not do so equally for all. Higher scores on the constructed genetic sensitivity measure are related to increased susceptibility to negative parental relationships.
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Affiliation(s)
- John M Stogner
- Department of Criminal Justice and Criminology, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223, USA
| | - Chris L Gibson
- Department of Sociology and Criminology & Law, University of Florida, PO Box 117330, Gainesville, FL 32611-7330, USA
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15
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Sales JM, Smearman E, Brown JL, Brody GH, Philibert RA, Rose E, DiClemente RJ. Associations Between a Dopamine D4 Receptor Gene, Alcohol Use, and Sexual Behaviors among Female Adolescent African Americans. JOURNAL OF HIV/AIDS & SOCIAL SERVICES 2015; 14:136-153. [PMID: 27087792 PMCID: PMC4831568 DOI: 10.1080/15381501.2014.920759] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Adolescent African-American females are disproportionately impacted by HIV, thus there is a clear need to understand factors associated with increased HIV-risk behaviors among this vulnerable population. We sought to explore the association between a dopamine D4 receptor gene (DRD4), a genetic marker associated with natural variations in rewarding behaviors, and self-reported alcohol-use and sexual risk-behaviors, while controlling for other known correlates of risk-taking such as impulsivity, sensation seeking, and peer norms among a group of high-risk African American female adolescents to evaluate whether this biological factor enhances our understanding of patterns of risk in this vulnerable group.
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Affiliation(s)
- Jessica M. Sales
- Rollins School of Public Health, Department of Behavioral Sciences and Health Education
- Emory University Center for AIDS Research, Social & Behavioral Sciences Core
- Center for Contextual Genetics and Prevention Science, University of Georgia
| | - Erica Smearman
- Rollins School of Public Health, Department of Behavioral Sciences and Health Education
- Emory University School of Medicine, Medical Scientist Training Program
| | - Jennifer L. Brown
- Rollins School of Public Health, Department of Behavioral Sciences and Health Education
- Emory University Center for AIDS Research, Social & Behavioral Sciences Core
| | - Gene H. Brody
- Rollins School of Public Health, Department of Behavioral Sciences and Health Education
- Emory University Center for AIDS Research, Social & Behavioral Sciences Core
- Center for Contextual Genetics and Prevention Science, University of Georgia
| | - Robert A. Philibert
- Center for Contextual Genetics and Prevention Science, University of Georgia
- University of Iowa, Department of Psychiatry
| | - Eve Rose
- Rollins School of Public Health, Department of Behavioral Sciences and Health Education
| | - Ralph J. DiClemente
- Rollins School of Public Health, Department of Behavioral Sciences and Health Education
- Emory University Center for AIDS Research, Social & Behavioral Sciences Core
- Center for Contextual Genetics and Prevention Science, University of Georgia
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16
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Differential susceptibility to environmental influences: Interactions between child temperament and parenting in adolescent alcohol use. Dev Psychopathol 2015; 28:265-75. [PMID: 26030853 DOI: 10.1017/s0954579415000437] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Temperament and parental practices (PP) are important predictors of adolescent alcohol use (AU); however, less is known about how they combine to increase or decrease risk of AU. This study examined whether age 6 temperament (i.e., impulsivity and inhibitory control) interacted with age 6 coercive PP and/or age 14 parental monitoring to predict AU at 15 years among 209 adolescents. Results showed that low parental monitoring was associated with more frequent AU and that coercive PP interacted with impulsivity to predict AU. This interaction was examined as a function of two models that were not studied before in the prediction of AU: the diathesis-stress model (i.e., impulsive children are more "vulnerable" to adverse PP than those with an easy temperament); and the differential susceptibility model (i.e., impulsive children are also more likely to benefit from good PP). Results supported the differential susceptibility model by showing that impulsive children were not only at higher risk for AU when combined with high coercive PP but also benefit from the absence of coercive PP. This supports the suggestion that the conception of certain temperament characteristics, or in this case impulsivity, as a "vulnerability" for adolescent AU, may need revision because it misrepresents the malleability it may imply.
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Mrug S, Windle M. DRD4 and susceptibility to peer influence on alcohol use from adolescence to adulthood. Drug Alcohol Depend 2014; 145:168-73. [PMID: 25457740 PMCID: PMC4268151 DOI: 10.1016/j.drugalcdep.2014.10.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 10/10/2014] [Accepted: 10/14/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND The long allele of DRD4 is associated with greater susceptibility to peer influences on alcohol use in young adulthood, but it is unclear whether this increased susceptibility extends to other developmental periods. This study examined the interactive effects of DRD4 polymorphism and friends' alcohol use from adolescence to adulthood. METHODS Participants (N = 340; 59% female; 98% White) reported on their own and their friends' alcohol use at four time points between mean ages 17 and 33. Autoregressive cross-lagged models evaluated reciprocal relationships between friends' alcohol use and participants' own alcohol use and frequency of heavy drinking over time. Multigroup modeling tested differences in model paths and covariances across high vs. low risk DRD4 polymorphisms. RESULTS Alcohol use at age 33 was predicted by previous friends' alcohol use and correlated with current friends' alcohol use only for carriers of the DRD4 long allele. Regardless of DRD4 genotype, friends' alcohol use at age 17 predicted greater alcohol use and more frequent heavy drinking at age 23. Alcohol use and/or heavy drinking predicted greater friends' alcohol use at later time points for both genotype groups across adolescence and adulthood. CONCLUSIONS The long allele of DRD4 is associated with increased susceptibility to peer influences on alcohol use in young adulthood, but not earlier in development. Adults with the long allele of DRD4 may benefit from interventions educating them about this risk and equipping them with strategies to reduce affiliations with and influence of drinking friends.
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Affiliation(s)
- Sylvie Mrug
- University of Alabama at Birmingham, Department of Psychology, 1720 Second Avenue South, CH415, Birmingham, AL 35294-1170, United States.
| | - Michael Windle
- Emory University, Department of Behavioral Science and Health Education, 1518 Clifton Road NE, Room 514, Atlanta, GA 30322
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18
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Differential susceptibility to effects of maternal sensitivity? A study of candidate plasticity genes. Dev Psychopathol 2014; 27:725-46. [DOI: 10.1017/s0954579414000844] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
AbstractHere we tested whether there was genetic moderation of effects of early maternal sensitivity on social–emotional and cognitive–linguistic development from early childhood onward and whether any detected Gene × Environment interaction effects proved consistent with differential-susceptibility or diathesis–stress models of Person × Environment interaction (N= 695). Two new approaches for evaluating models were employed with 12 candidate genes. Whereas maternal sensitivity proved to be a consistent predictor of child functioning across the primary-school years, candidate genes did not show many main effects, nor did they tend to interact with maternal sensitivity/insensitivity. These findings suggest that the developmental benefits of early sensitive mothering and the costs of insensitive mothering look more similar than different across genetically different children in the current sample. Although acknowledgement of this result is important, it is equally important that the generally null Gene × Environment results reported here not be overgeneralized to other samples, other predictors, other outcomes, and other candidate genes.
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19
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Beyond risk, resilience, and dysregulation: Phenotypic plasticity and human development. Dev Psychopathol 2013; 25:1243-61. [DOI: 10.1017/s095457941300059x] [Citation(s) in RCA: 225] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
AbstractWe provide a theoretical and empirical basis for the claim that individual differences exist in developmental plasticity and that phenotypic plasticity should be a subject of study in its own right. To advance this argument, we begin by highlighting challenges that evolutionary thinking poses for a science of development and psychopathology, including for the diathesis–stress framework that has (fruitfully) guided so much empirical inquiry on developmental risk, resilience, and dysregulation. With this foundation laid, we raise a series of issues that the differential-susceptibility hypothesis calls attention to, while highlighting findings that have emerged over just the past several years and are pertinent to some of the questions posed. Even though it is clear that this new perspective on Person × Environment interaction is stimulating research and influencing how hypotheses are framed and data interpreted, a great many topics remain that need empirical attention. Our intention is to encourage students of development and psychopathology to treat phenotypic plasticity as an individual-difference construct while exploring unknowns in the differential-susceptibility equation.
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20
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Dopamine receptor D4 gene moderates the effect of positive and negative peer experiences on later delinquency: The Tracking Adolescents' Individual Lives Survey study. Dev Psychopathol 2013; 25:1107-17. [DOI: 10.1017/s0954579413000400] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
AbstractThe quality of adolescents' relationships with peers can have a lasting impact on later psychosocial adjustment, mental health, and behavior. However, the effect of peer relations on later problem behavior is not uniformly strong, and genetic factors might influence this association. This study used four-wave longitudinal (11–19 years) data (n = 1,151) from the Tracking Adolescents' Individual Lives Survey, a Dutch cohort study into adolescent development to test whether the dopamine receptor D4 polymorphism moderates the impact of negative (i.e., victimization) and positive peer experiences (i.e., social well-being) on later delinquency. Contrary to our expectations, results showed that carriers of the dopamine receptor D4 gene 4-repeat homozygous variant instead of those carrying the 7-repeat allele were more susceptible to the effects of both peer victimization and social well-being on delinquency later in adolescence. Findings of our study are discussed in light of other studies into genetic moderation of peer effects on adolescent development and the possibility that developmental specifics in adolescence, such as maturation processes in brain structure and functioning, may affect the interplay of environmental and genetic factors in this period in life.
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21
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Chassin L, Sher KJ, Hussong A, Curran P. The developmental psychopathology of alcohol use and alcohol disorders: research achievements and future directions. Dev Psychopathol 2013. [PMID: 24342856 DOI: 10.1017/s0954579413000771.the] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
The last 25 years have seen significant advances in our conceptualization of alcohol use and alcohol use disorders within a developmental framework, along with advances in our empirical understanding that have been potentiated by advances in quantitative methods. These include advances in understanding the heterogeneity of trajectories of alcohol outcomes; new insights about early childhood antecedents, and adolescence and emerging adulthood as important developmental periods for alcohol outcomes; a more nuanced understanding of the influences of developmental transitions, and their timing and contexts; a greater appreciation for the importance of considering multiple levels of analysis (including an increasing number of genetically informative studies); a continuing focus on studying multiple pathways underlying alcohol outcomes; and an increasing focus on studying the effects of alcohol exposure on future development. The current paper reviews these advances and suggests directions for future study.
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22
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Chassin L, Sher KJ, Hussong A, Curran P. The developmental psychopathology of alcohol use and alcohol disorders: research achievements and future directions. Dev Psychopathol 2013; 25:1567-84. [PMID: 24342856 PMCID: PMC4080810 DOI: 10.1017/s0954579413000771] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The last 25 years have seen significant advances in our conceptualization of alcohol use and alcohol use disorders within a developmental framework, along with advances in our empirical understanding that have been potentiated by advances in quantitative methods. These include advances in understanding the heterogeneity of trajectories of alcohol outcomes; new insights about early childhood antecedents, and adolescence and emerging adulthood as important developmental periods for alcohol outcomes; a more nuanced understanding of the influences of developmental transitions, and their timing and contexts; a greater appreciation for the importance of considering multiple levels of analysis (including an increasing number of genetically informative studies); a continuing focus on studying multiple pathways underlying alcohol outcomes; and an increasing focus on studying the effects of alcohol exposure on future development. The current paper reviews these advances and suggests directions for future study.
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23
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Caspi A, Houts RM, Belsky DW, Goldman-Mellor SJ, Harrington H, Israel S, Meier MH, Ramrakha S, Shalev I, Poulton R, Moffitt TE. The p Factor: One General Psychopathology Factor in the Structure of Psychiatric Disorders? Clin Psychol Sci 2013; 2:119-137. [PMID: 25360393 DOI: 10.1177/2167702613497473] [Citation(s) in RCA: 1390] [Impact Index Per Article: 126.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Mental disorders traditionally have been viewed as distinct, episodic, and categorical conditions. This view has been challenged by evidence that many disorders are sequentially comorbid, recurrent/chronic, and exist on a continuum. Using the Dunedin Multidisciplinary Health and Development Study, we examined the structure of psychopathology, taking into account dimensionality, persistence, co-occurrence, and sequential comorbidity of mental disorders across 20 years, from adolescence to midlife. Psychiatric disorders were initially explained by three higher-order factors (Internalizing, Externalizing, and Thought Disorder) but explained even better with one General Psychopathology dimension. We have called this dimension the p factor because it conceptually parallels a familiar dimension in psychological science: the g factor of general intelligence. Higher p scores are associated with more life impairment, greater familiality, worse developmental histories, and more compromised early-life brain function. The p factor explains why it is challenging to find causes, consequences, biomarkers, and treatments with specificity to individual mental disorders. Transdiagnostic approaches may improve research.
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Affiliation(s)
- Avshalom Caspi
- Department of Psychology and Neuroscience, Duke University ; Institute for Genome Sciences and Policy, Duke University ; Department of Psychiatry and Behavioral Sciences, Duke University Medical Center ; Social, Genetic, and Developmental Psychiatry Centre, Institute of Psychiatry, King's College London
| | - Renate M Houts
- Department of Psychology and Neuroscience, Duke University
| | - Daniel W Belsky
- Center for the Study of Aging and Human Development, Duke University Medical Center
| | | | | | - Salomon Israel
- Department of Psychology and Neuroscience, Duke University
| | | | - Sandhya Ramrakha
- Dunedin Multidisciplinary Health and Development Research Unit, Department, of Preventive and Social Medicine, School of Medicine, University of Otago
| | - Idan Shalev
- Department of Psychology and Neuroscience, Duke University
| | - Richie Poulton
- Dunedin Multidisciplinary Health and Development Research Unit, Department, of Preventive and Social Medicine, School of Medicine, University of Otago
| | - Terrie E Moffitt
- Department of Psychology and Neuroscience, Duke University ; Institute for Genome Sciences and Policy, Duke University ; Department of Psychiatry and Behavioral Sciences, Duke University Medical Center ; Social, Genetic, and Developmental Psychiatry Centre, Institute of Psychiatry, King's College London
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24
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Volkow ND, Tomasi D, Wang GJ, Telang F, Fowler JS, Goldstein RZ, Klein N, Wong C, Swanson JM, Shumay E. Association between dopamine D4 receptor polymorphism and age related changes in brain glucose metabolism. PLoS One 2013; 8:e63492. [PMID: 23717434 PMCID: PMC3661541 DOI: 10.1371/journal.pone.0063492] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 04/03/2013] [Indexed: 12/25/2022] Open
Abstract
Aging is associated with reductions in brain glucose metabolism in some cortical and subcortical regions, but the rate of decrease varies significantly between individuals, likely reflecting genetic and environmental factors and their interactions. Here we test the hypothesis that the variant of the dopamine receptor D4 (DRD4) gene (VNTR in exon 3), which has been associated with novelty seeking and sensitivity to environmental stimuli (negative and positive) including the beneficial effects of physical activity on longevity, influence the effects of aging on the human brain. We used positron emission tomography (PET) and [(18)F]fluoro-D-glucose ((18)FDG) to measure brain glucose metabolism (marker of brain function) under baseline conditions (no stimulation) in 82 healthy individuals (age range 22-55 years). We determined their DRD4 genotype and found an interaction with age: individuals who did not carry the 7-repeat allele (7R-, n = 53) had a significant (p<0.0001) negative association between age and relative glucose metabolism (normalized to whole brain glucose metabolism) in frontal (r = -0.52), temporal (r = -0.51) and striatal regions (r = -0.47, p<0.001); such that older individuals had lower metabolism than younger ones. In contrast, for carriers of the 7R allele (7R+ n = 29), these correlations with age were not significant and they only showed a positive association with cerebellar glucose metabolism (r = +0.55; p = 0.002). Regression slopes of regional brain glucose metabolism with age differed significantly between the 7R+ and 7R- groups in cerebellum, inferior temporal cortex and striatum. These results provide evidence that the DRD4 genotype might modulate the associations between regional brain glucose metabolism and age and that the carriers of the 7R allele appear to be less sensitive to the effects of age on brain glucose metabolism.
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Affiliation(s)
- Nora D Volkow
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, Maryland, USA.
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25
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Miranda R, Reynolds E, Ray L, Justus A, Knopik VS, McGeary J, Meyerson LA. Preliminary evidence for a gene-environment interaction in predicting alcohol use disorders in adolescents. Alcohol Clin Exp Res 2013; 37:325-31. [PMID: 23136901 PMCID: PMC3700411 DOI: 10.1111/j.1530-0277.2012.01897.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Accepted: 05/22/2012] [Indexed: 01/02/2023]
Abstract
BACKGROUND Emerging research suggests that genetic influences on adolescent drinking are moderated by environmental factors. The present study builds on molecular-genetic findings by conducting the first analysis of gene-environment interactions in the association between a functional single nucleotide polymorphism (SNP) of the μ-opioid receptor (OPRM1) gene (A118G) and risk of developing an alcohol use disorder (AUD) during adolescence. Specifically, we tested whether variation in parenting practices or affiliation with deviant peers moderated the link between the OPRM1 gene and risk of an AUD. METHODS Adolescents reporting European ancestry (N = 104), ages 12 to 19 years (M = 15.60, SD = 1.77), were interviewed to ascertain AUD diagnoses, provided a DNA sample for genetic analyses, and completed measures of parental monitoring and deviant peer affiliation. Logistic regression was used to test the effects of environmental variables and their interactions with OPRM1 genotype as predictors of AUD diagnosis while controlling for age and sex. RESULTS Case-control comparisons showed that the proportion of youth with an AUD (n = 18) significantly differed by genotype such that 33.3% of G allele carriers met criteria for an AUD compared to 10.8% of youth who were homozygous for the A allele (p = 0.006). The OPRM1 × parental monitoring (odds ratio = 0.16) and OPRM1 × deviant peer affiliation (odds ratio = 7.64) interactions were significant predictors of AUD risk, such that G allele carriers with high levels of deviant peer affiliation or lower levels of parental monitoring had the greatest likelihood of developing an AUD (p-values <0.01). CONCLUSIONS This study provides initial evidence that the association between the A118G SNP of the OPRM1 gene and risk of AUDs is moderated by modifiable factors. These results are limited, however, by the small sample size and require replication.
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Affiliation(s)
- Robert Miranda
- Center for Alcohol and Addiction Studies, Brown University, Providence, RI 02912, USA.
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26
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Stojek M, Fischer S. Impulsivity and Motivations to Consume Alcohol: A Prospective Study on Risk of Dependence in Young Adult Women. Alcohol Clin Exp Res 2012; 37:292-9. [DOI: 10.1111/j.1530-0277.2012.01875.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Accepted: 05/08/2012] [Indexed: 11/30/2022]
Affiliation(s)
- Monika Stojek
- Department of Psychology ; University of Georgia; Athens; Georgia
| | - Sarah Fischer
- Department of Psychology ; University of Georgia; Athens; Georgia
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27
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Palmer RHC, McGeary JE, Francazio S, Raphael BJ, Lander AD, Heath AC, Knopik VS. The genetics of alcohol dependence: advancing towards systems-based approaches. Drug Alcohol Depend 2012; 125:179-91. [PMID: 22854292 PMCID: PMC3470479 DOI: 10.1016/j.drugalcdep.2012.07.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Revised: 07/09/2012] [Accepted: 07/10/2012] [Indexed: 01/02/2023]
Abstract
BACKGROUND Personalized treatment for psychopathologies, in particular alcoholism, is highly dependent upon our ability to identify patterns of genetic and environmental effects that influence a person's risk. Unfortunately, array-based whole genome investigations into heritable factors that explain why one person becomes dependent upon alcohol and another does not, have indicated that alcohol's genetic architecture is highly complex. That said, uncovering and interpreting the missing heritability in alcohol genetics research has become all the more important, especially since the problem may extend to our inability to model the cumulative and combinatorial relationships between common and rare genetic variants. As numerous studies begin to illustrate the dependency of alcohol pharmacotherapies on an individual's genotype, the field is further challenged to identify new ways to transcend agnostic genomewide association approaches. We discuss insights from genetic studies of alcohol related diseases, as well as issues surrounding alcohol's genetic complexity and etiological heterogeneity. Finally, we describe the need for innovative systems-based approaches (systems genetics) that can provide additional statistical power that can enhance future gene-finding strategies and help to identify heretofore-unrealized mechanisms that may provide new targets for prevention/treatments efforts. Emerging evidence from early studies suggest that systems genetics has the potential to organize our neurological, pharmacological, and genetic understanding of alcohol dependence into a biologically plausible framework that represents how perturbations across evolutionarily robust biological systems determine susceptibility to alcohol dependence.
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Affiliation(s)
- R H C Palmer
- Division of Behavioral Genetics, Department of Psychiatry at Rhode Island Hospital, USA.
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28
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Creswell KG, Sayette MA, Manuck SB, Ferrell RE, Hill SY, Dimoff JD. DRD4 polymorphism moderates the effect of alcohol consumption on social bonding. PLoS One 2012; 7:e28914. [PMID: 22347363 PMCID: PMC3275561 DOI: 10.1371/journal.pone.0028914] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Accepted: 11/17/2011] [Indexed: 11/26/2022] Open
Abstract
Development of interpersonal relationships is a fundamental human motivation, and behaviors facilitating social bonding are prized. Some individuals experience enhanced reward from alcohol in social contexts and may be at heightened risk for developing and maintaining problematic drinking. We employed a 3 (group beverage condition) ×2 (genotype) design (N = 422) to test the moderating influence of the dopamine D4 receptor gene (DRD4 VNTR) polymorphism on the effects of alcohol on social bonding. A significant gene x environment interaction showed that carriers of at least one copy of the 7-repeat allele reported higher social bonding in the alcohol, relative to placebo or control conditions, whereas alcohol did not affect ratings of 7-absent allele carriers. Carriers of the 7-repeat allele were especially sensitive to alcohol's effects on social bonding. These data converge with other recent gene-environment interaction findings implicating the DRD4 polymorphism in the development of alcohol use disorders, and results suggest a specific pathway by which social factors may increase risk for problematic drinking among 7-repeat carriers. More generally, our findings highlight the potential utility of employing transdisciplinary methods that integrate genetic methodologies, social psychology, and addiction theory to improve theories of alcohol use and abuse.
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Affiliation(s)
- Kasey G Creswell
- Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America.
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29
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Ptácek R, Kuzelová H, Stefano GB. Dopamine D4 receptor gene DRD4 and its association with psychiatric disorders. Med Sci Monit 2011; 17:RA215-20. [PMID: 21873960 PMCID: PMC3560519 DOI: 10.12659/msm.881925] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Dopamine receptors control neural signals that modulates behavior. Dopamine plays an important role in normal attention; that is the reason for studying the genes of the dopaminergic system, mainly in connection with disorders of attention. DRD4 influences the postsynaptic action of dopamine and is implicated in many neurological processes, exhibits polymorphism and is one of the most studied genes in connection with psychiatric disorders. Associations were found with ADHD (attention deficit hyperactivity disorder), substance dependences, several specific personality traits, and reaction to stress. These findings have implications for pharmacogenetics. This article reviews the principle published associations of DRD4 variants with psychiatric disorders.
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Affiliation(s)
- Radek Ptácek
- Clinic of Psychiatry, 1st Faculty of Medicine, Charles University in Prague, Czech Republic.
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