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Ortega LA, Aragon-Carvajal DM, Cortes-Corso KT, Forero-Castillo F. Early developmental risks for tobacco addiction: A probabilistic epigenesis framework. Neurosci Biobehav Rev 2024; 156:105499. [PMID: 38056543 DOI: 10.1016/j.neubiorev.2023.105499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 11/23/2023] [Accepted: 12/01/2023] [Indexed: 12/08/2023]
Abstract
Considerable progress has been made in elucidating the relationships between early life psychobiological and environmental risk factors and the development of tobacco addiction. However, a comprehensive understanding of the heterogeneity in tobacco addiction phenotypes requires integrating research findings. The probabilistic epigenesis meta-theory offers a valuable framework for this integration, considering systemic, multilevel, developmental, and evolutionary perspectives. In this paper, we critically review relevant research on early developmental risks associated with tobacco addiction and highlight the integrative heuristic value of the probabilistic epigenesis framework for this research. For this, we propose a four-level systems approach as an initial step towards integration, analyzing complex interactions among different levels of influence. Additionally, we explore a coaction approach to examine key interactions between early risk factors. Moreover, we introduce developmental pathways to understand interindividual differences in tobacco addiction risk during development. This integrative approach holds promise for advancing our understanding of tobacco addiction etiology and informing potentially effective intervention strategies.
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Affiliation(s)
- Leonardo A Ortega
- Facultad de Psicologia, Fundacion Universitaria Konrad Lorenz, Colombia.
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Coppens R, Rabinovich NE, Kanneganti R, Diggs HA, Wiggs K, Healey T, Huggenvik J, Rose GM, Gilbert DG. APOE genotype influences P3b amplitude and response to smoking abstinence in young adults. Psychopharmacology (Berl) 2021; 238:1171-1181. [PMID: 33506304 DOI: 10.1007/s00213-021-05763-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 01/12/2021] [Indexed: 11/27/2022]
Abstract
RATIONALE There is strong evidence that nicotine can enhance cognitive functions and growing evidence that this effect may be larger in young healthy APOE ε4 carriers. However, the moderating effects of the APOE ε4 allele on cognitive impairments caused by nicotine deprivation in chronic smokers have not yet been studied with brain indices. OBJECTIVE We sought to determine whether young female carriers of the APOE ε4 allele, relative to noncarriers, would exhibit larger abstinence-induced decreases in P3b amplitude during a two-stimulus auditory oddball task. METHODS We compared parietal P3bs in female chronic smokers with either APOE ε3/ε3 (n = 54) or ε3/ε4 (n = 20) genotype under nicotine-sated conditions and after 12-17-h nicotine deprivation. RESULTS Nicotine deprivation significantly reduced P3b amplitudes in APOE ε4 carriers, but not in APOE-ε3/ε3 individuals, such that the difference seen prior to nicotine deprivation was eliminated. CONCLUSIONS The results suggest that subjects with the APOE ε4 allele are more sensitive to nicotine, which could influence smoking patterns, the risk for nicotine dependence, and the cognitive effects of nicotine use in these individuals.
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Affiliation(s)
- Ryan Coppens
- Department of Psychology, Southern Illinois University, Carbondale, IL, USA
- Center for Integrated Research in Cognitive & Neural Sciences, Southern Illinois University, Carbondale, IL, USA
| | - Norka E Rabinovich
- Department of Psychology, Southern Illinois University, Carbondale, IL, USA
| | | | - Herman A Diggs
- Department of Psychology, Southern Illinois University, Carbondale, IL, USA
- Center for Integrated Research in Cognitive & Neural Sciences, Southern Illinois University, Carbondale, IL, USA
| | - Kristin Wiggs
- Department of Psychology, Southern Illinois University, Carbondale, IL, USA
| | - Travis Healey
- Department of Physiology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Jodi Huggenvik
- Department of Physiology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Gregory M Rose
- Center for Integrated Research in Cognitive & Neural Sciences, Southern Illinois University, Carbondale, IL, USA
- Department of Physiology, Southern Illinois University School of Medicine, Springfield, IL, USA
- Department of Anatomy, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - David G Gilbert
- Department of Psychology, Southern Illinois University, Carbondale, IL, USA.
- Center for Integrated Research in Cognitive & Neural Sciences, Southern Illinois University, Carbondale, IL, USA.
- School of Psychological and Behavioral Sciences, Southern Illinois University, Mail Code 6502, Carbondale, IL, 62901, USA.
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3
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Sharp BM, Chen H. Neurogenetic determinants and mechanisms of addiction to nicotine and smoked tobacco. Eur J Neurosci 2018; 50:2164-2179. [DOI: 10.1111/ejn.14171] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 08/31/2018] [Accepted: 09/18/2018] [Indexed: 12/18/2022]
Affiliation(s)
- Burt M. Sharp
- Department of Genetics, Genomics and Informatics College of Medicine University of Tennessee Health Science Center 19 S. Manassas, CRB #220 Memphis TN 38103 USA
| | - Hao Chen
- Department of Pharmacology University of Tennessee Health Science Center Memphis TN USA
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Maes HH, Morley K, Neale MC, Kendler KS, Heath AC, Eaves LJ, Martin NG. Cross-Cultural Comparison of Genetic and Cultural Transmission of Smoking Initiation Using an Extended Twin Kinship Model. Twin Res Hum Genet 2018; 21:179-190. [PMID: 29757125 PMCID: PMC6340705 DOI: 10.1017/thg.2018.22] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Considerable evidence from twin and adoption studies indicates that genetic and shared environmental factors play a role in the initiation of smoking behavior. Although twin and adoption designs are powerful to detect genetic and environmental influences, they do not provide information on the processes of assortative mating and parent-offspring transmission and their contribution to the variability explained by genetic and/or environmental factors. METHODS We examined the role of genetic and environmental factors in individual differences for smoking initiation (SI) using an extended kinship design. This design allows the simultaneous testing of additive and non-additive genetic, shared and individual-specific environmental factors, as well as sex differences in the expression of genes and environment in the presence of assortative mating and combined genetic and cultural transmission, while also estimating the regression of the prevalence of SI on age. A dichotomous lifetime 'ever' smoking measure was obtained from twins and relatives in the 'Virginia 30,000' sample and the 'Australian 25,000'. RESULTS Results demonstrate that both genetic and environmental factors play a significant role in the liability to SI. Major influences on individual differences appeared to be additive genetic and unique environmental effects, with smaller contributions from assortative mating, shared sibling environment, twin environment, cultural transmission, and resulting genotype-environment covariance. Age regression of the prevalence of SI was significant. The finding of negative cultural transmission without dominance led us to investigate more closely two possible mechanisms for the lower parent-offspring correlations compared to the sibling and DZ twin correlations in subsets of the data: (1) age × gene interaction, and (2) social homogamy. Neither of the mechanism provided a significantly better explanation of the data. CONCLUSIONS This study showed significant heritability, partly due to assortment, and significant effects of primarily non-parental shared environment on liability to SI.
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Affiliation(s)
- Hermine H Maes
- Department of Human Genetics,Virginia Institute for Psychiatric and Behavioral Genetics,Virginia Commonwealth University,Richmond,VA,USA
| | - Kate Morley
- Genetic Epidemiology,QIMR Berghofer Medical Research Institute,Brisbane,Queensland,Australia
| | - Michael C Neale
- Department of Human Genetics,Virginia Institute for Psychiatric and Behavioral Genetics,Virginia Commonwealth University,Richmond,VA,USA
| | - Kenneth S Kendler
- Department of Human Genetics,Virginia Institute for Psychiatric and Behavioral Genetics,Virginia Commonwealth University,Richmond,VA,USA
| | - Andrew C Heath
- Department of Psychiatry,Washington University School of Medicine,St Louis,MO,USA
| | - Lindon J Eaves
- Department of Human Genetics,Virginia Institute for Psychiatric and Behavioral Genetics,Virginia Commonwealth University,Richmond,VA,USA
| | - Nicholas G Martin
- Genetic Epidemiology,QIMR Berghofer Medical Research Institute,Brisbane,Queensland,Australia
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Salatino-Oliveira A, Rohde LA, Hutz MH. The dopamine transporter role in psychiatric phenotypes. Am J Med Genet B Neuropsychiatr Genet 2018; 177:211-231. [PMID: 28766921 DOI: 10.1002/ajmg.b.32578] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 06/26/2017] [Accepted: 07/18/2017] [Indexed: 01/06/2023]
Abstract
The dopamine transporter (DAT) is one of the most relevant and investigated neurotransmitter transporters. DAT is a plasma membrane protein which plays a homeostatic role, controlling both extracellular and intracellular concentrations of dopamine (DA). Since unbalanced DA levels are known to be involved in numerous mental disorders, a wealth of investigations has provided valuable insights concerning DAT role into normal brain functioning and pathological processes. Briefly, this extensive but non-systematic review discusses what is recently known about the role of SLC6A3 gene which encodes the dopamine transporter in psychiatric phenotypes. DAT protein, SLC6A3 gene, animal models, neuropsychology, and neuroimaging investigations are also concisely discussed. To conclude, current challenges are reviewed in order to provide perspectives for future studies.
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Affiliation(s)
| | - Luis A Rohde
- Division of Child and Adolescent Psychiatry, Hospital de Clinicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Institute for Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil
| | - Mara H Hutz
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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Abstract
Drug addiction involves long-term behavioral abnormalities that arise in response to repeated exposure to drugs of abuse in vulnerable individuals. It is a multifactorial syndrome involving a complex interplay between genes and the environment. Evidence suggests that the underlying mechanisms regulating these persistent behavioral abnormalities involve changes in gene expression throughout the brain's reward circuitry, in particular, in the mesolimbic dopamine system. In the past decade, investigations have begun to reveal potential genes involved in the risk for addiction through genomewide association studies. Additionally, a crucial role for epigenetic mechanisms, which mediate the enduring effects of drugs of abuse on the brain in animal models of addiction, has been established. This chapter focuses on recent evidence that genetic and epigenetic regulatory events underlie the changes throughout the reward circuitry in humans, as well as animal models of addiction. While further investigations are necessary, a picture of genetic and epigenetic mechanisms involved in addiction is beginning to emerge and the insight gained from these studies will be key to the identification of novel targets for improved diagnosis and treatment of addiction syndromes in humans.
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Affiliation(s)
- Deena M Walker
- Fishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Eric J Nestler
- Fishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States.
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David SP, Wang A, Kapphahn K, Hedlin H, Desai M, Henderson M, Yang L, Walsh KM, Schwartz AG, Wiencke JK, Spitz MR, Wenzlaff AS, Wrensch MR, Eaton CB, Furberg H, Mark Brown W, Goldstein BA, Assimes T, Tang H, Kooperberg CL, Quesenberry CP, Tindle H, Patel MI, Amos CI, Bergen AW, Swan GE, Stefanick ML. Gene by Environment Investigation of Incident Lung Cancer Risk in African-Americans. EBioMedicine 2016; 4:153-61. [PMID: 26981579 PMCID: PMC4776066 DOI: 10.1016/j.ebiom.2016.01.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 12/22/2015] [Accepted: 01/05/2016] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Genome-wide association studies have identified polymorphisms linked to both smoking exposure and risk of lung cancer. The degree to which lung cancer risk is driven by increased smoking, genetics, or gene-environment interactions is not well understood. METHODS We analyzed associations between 28 single nucleotide polymorphisms (SNPs) previously associated with smoking quantity and lung cancer in 7156 African-American females in the Women's Health Initiative (WHI), then analyzed main effects of top nominally significant SNPs and interactions between SNPs, cigarettes per day (CPD) and pack-years for lung cancer in an independent, multi-center case-control study of African-American females and males (1078 lung cancer cases and 822 controls). FINDINGS Nine nominally significant SNPs for CPD in WHI were associated with incident lung cancer (corrected p-values from 0.027 to 6.09 × 10(-5)). CPD was found to be a nominally significant effect modifier between SNP and lung cancer for six SNPs, including CHRNA5 rs2036527[A](betaSNP*CPD = - 0.017, p = 0.0061, corrected p = 0.054), which was associated with CPD in a previous genome-wide meta-analysis of African-Americans. INTERPRETATION These results suggest that chromosome 15q25.1 variants are robustly associated with CPD and lung cancer in African-Americans and that the allelic dose effect of these polymorphisms on lung cancer risk is most pronounced in lighter smokers.
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Affiliation(s)
- Sean P. David
- Division of General Medical Disciplines, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Ange Wang
- Stanford Prevention Research Center, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Kristopher Kapphahn
- Quantitative Sciences Unit, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Haley Hedlin
- Quantitative Sciences Unit, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Manisha Desai
- Quantitative Sciences Unit, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Michael Henderson
- Stanford Prevention Research Center, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Lingyao Yang
- Quantitative Sciences Unit, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Kyle M. Walsh
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA, United States
- Program in Cancer Genetics, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, United States
| | - Ann G. Schwartz
- Department of Oncology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, United States
| | - John K. Wiencke
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA, United States
| | - Margaret R. Spitz
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, United States
| | - Angela S. Wenzlaff
- Department of Oncology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, United States
| | - Margaret R. Wrensch
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA, United States
| | - Charles B. Eaton
- Center for Primary Care and Prevention, Department of Family Medicine, Warren Alpert Medical School of Brown University, Pawtucket, RI, United States
| | - Helena Furberg
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - W. Mark Brown
- Division of Public Health Sciences, Department of Biostatistical Sciences, Wake Forest University Health Sciences, Winston-Salem, NC, United States
| | - Benjamin A. Goldstein
- Department of Biostatistics & Bioinformatics, Duke University School of Medicine, Durham, NC, United States
| | - Themistocles Assimes
- Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Hua Tang
- Department of Genetics, Stanford University School of Medicine, Stanford, CA, United States
| | - Charles L. Kooperberg
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA, United States
| | | | - Hilary Tindle
- Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, NH, United States
| | - Manali I. Patel
- Division of Oncology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Christopher I. Amos
- Departments of Genetics, Geisel School of Medicine at Dartmouth, Hanover, NH, United States
- Community and Family Medicine, Geisel School of Medicine at Dartmouth, Hanover, NH, United States
| | | | - Gary E. Swan
- Quantitative Sciences Unit, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Marcia L. Stefanick
- Stanford Prevention Research Center, Department of Medicine, Stanford University School of Medicine, Stanford, CA, United States
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Li H, Li S, Wang Q, Pan L, Jiang F, Yang X, Zhang N, Han M, Jia C. Association of 5-HTTLPR polymorphism with smoking behaviors: A meta-analysis. Physiol Behav 2015; 152:32-40. [DOI: 10.1016/j.physbeh.2015.09.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 08/11/2015] [Accepted: 09/08/2015] [Indexed: 10/23/2022]
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9
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Do EK, Prom-Wormley EC, Eaves LJ, Silberg JL, Miles DR, Maes HH. Genetic and Environmental Influences on Smoking Behavior across Adolescence and Young Adulthood in the Virginia Twin Study of Adolescent Behavioral Development and the Transitions to Substance Abuse Follow-Up. Twin Res Hum Genet 2015; 18:43-51. [PMID: 25662421 DOI: 10.1017/thg.2014.78] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Little is known regarding the underlying relationship between smoking initiation and current quantity smoked during adolescence into young adulthood. It is possible that the influences of genetic and environmental factors on this relationship vary across sex and age. To investigate this further, the current study applied a common causal contingency model to data from a Virginia-based twin study to determine: (1) if the same genetic and environmental factors are contributing to smoking initiation and current quantity smoked; (2) whether the magnitude of genetic and environmental factor contributions are the same across adolescence and young adulthood; and (3) if qualitative and quantitative differences in the sources of variance between males and females exist. Study results found no qualitative or quantitative sex differences in the relationship between smoking initiation and current quantity smoked, though relative contributions of genetic and environmental factors changed across adolescence and young adulthood. More specifically, smoking initiation and current quantity smoked remain separate constructs until young adulthood, when liabilities are correlated. Smoking initiation is explained by genetic, shared, and unique environmental factors in early adolescence and by genetic and unique environmental factors in young adulthood; while current quantity smoked is explained by shared environmental and unique environmental factors until young adulthood, when genetic and unique environmental factors play a larger role.
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Abstract
It is now well-established that smoking-related behaviours are under a substantial degree of genetic influence. Efforts are now focused on identifying the specific genetic variants which underlie these behaviours. Within this chapter, we introduce a variety of established and emerging methods employed to identify such variants, ranging from candidate gene to whole genome sequencing approaches, and highlight what these techniques have taught us about the genetic architecture of smoking-related behaviours. Further, we discuss how phenotype refinement has developed our understanding of these relationships, affording us insight into the specific mechanisms linking genetic variants to smoking-related behaviours.
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Ma Y, Yuan W, Cui W, Li MD. Meta-analysis reveals significant association of 3'-UTR VNTR in SLC6A3 with smoking cessation in Caucasian populations. Pharmacogenomics J 2016; 16:10-7. [PMID: 26149737 DOI: 10.1038/tpj.2015.44] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 03/29/2015] [Accepted: 05/18/2015] [Indexed: 12/11/2022]
Abstract
Many studies have examined the association between SLC6A3 3′-UTR VNTR polymorphism and smoking cessation; however, the results are inconclusive, primarily because of the small to moderate-size samples. The primary goal of this study was to determine whether this polymorphism has any effect on smoking cessation by a meta-analysis of all reported studies. We adopted a 9-repeat dominant model that considers 9-repeat and non 9-repeat as two genotypes and compared their frequencies in former vs. current smokers. Eleven studies with 5,480 participants were included. Considering the presence of study heterogeneity and differences in the availability of information from each study, three separate meta-analyses were performed with the Comprehensive Meta-Analysis statistical software (v. 2.0). The first meta-analysis provided evidence of association between the 9-repeat genotype and smoking cessation under the fixed-effects model (pooled odds ratio [OR] 1.13; 95% confidence interval [CI] 1.01, 1.27; P = 0.037) but not in the random-effects model (pooled OR 1.11; 95% CI 0.96, 1.29; P = 0.159). Given the marginal evidence of heterogeneity among studies (P = 0.10; I2 = 35.9%), which likely was caused by inclusion of an Asian-population treatment study with an opposite effect of the polymorphism on smoking cessation, we excluded these data, revealing a significant association between the 9-repeat genotype and smoking cessation under both the fixed- and random-effects models (pooled OR 1.15; 95% CI 1.02, 1.29; P = 0.02 for both models). By analyzing adjusted and unadjusted results, we performed the third meta-analysis, which showed consistently that the 9-repeat genotype was significantly associated with smoking cessation under both the fixed- and random-effects models (pooled OR 1.17; 95% CI 1.04, 1.31; P = 0.009 for both models). We conclude that the 3′-UTR VNTR polymorphism is significantly associated with smoking cessation, and smokers with one or more 9-repeat alleles have a 17% higher probability of smoking cessation than smokers carrying no such allele.
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12
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Docherty AR, Kremen WS, Panizzon MS, Prom-Wormley EC, Franz CE, Lyons MJ, Eaves LJ, Neale MC. Comparison of Twin and Extended Pedigree Designs for Obtaining Heritability Estimates. Behav Genet 2015; 45:461-6. [PMID: 25894926 DOI: 10.1007/s10519-015-9720-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 04/02/2015] [Indexed: 12/11/2022]
Abstract
This study explores power assumptions relating to extended pedigree designs (EPD) and classical twin designs (CTD). We conducted statistical analyses to compare the power of the two designs for examining neuroimaging phenotypes, varying heritability and varying whether shared environmental variance is fixed or free. Results indicated that CTDs have more power to estimate heritability, with the exception of one condition: in EPDs, the power increases relative to CTDs when shared environmental variance contributes to sibling similarity only. We additionally show that assuming a priori that shared environmental effects play no role in a phenotype-as is commonly done in pedigree designs-can lead to substantially biased heritability estimates. General results indicate that both CTDs and EPDs obtain quite precise heritability estimates. Finally, we discuss methodological considerations relating to assumptions about age effects and shared environment.
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Affiliation(s)
- Anna R Docherty
- Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University School of Medicine, Richmond, VA, 23219, USA,
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Abstract
Tobacco use remains the leading cause of preventable death worldwide. Establishing the genetic aetiology of tobacco use and dependence is an important first step in understanding the neurobiological mechanisms of tobacco use, and in turn the development of effective treatments. In addition, whilst the effects of tobacco use on a broad range of physical illnesses (e.g. lung cancer, respiratory disease, cardiovascular disease) are now well-established, the causal effects of tobacco use on a number of other outcomes remains to be established. Determining the causes and consequences of tobacco use therefore continues to be both a scientific and a public health priority. Here we review emerging methods in genetic research that allow stronger causal inferences to be drawn from observational data.
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Affiliation(s)
- Jennifer J. Ware
- MRC Integrative Epidemiology Unit at the University of Bristol, Bristol, BS8 2BN, United Kingdom,School of Social and Community Medicine, University of Bristol, Oakfield House, Bristol, BS8 2BN, United Kingdom
| | - Marcus R. Munafò
- MRC Integrative Epidemiology Unit at the University of Bristol, Bristol, BS8 2BN, United Kingdom,UK Centre for Tobacco and Alcohol Studies and School of Experimental Psychology, University of Bristol, 12a Priory Road, Bristol, BS8 1TU, United Kingdom
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Zoloto A, Nagoshi CT, Presson C, Chassin L. Attention deficit/hyperactivity disorder symptoms and depression symptoms as mediators in the intergenerational transmission of smoking. Drug Alcohol Depend 2012; 126:147-55. [PMID: 22682659 PMCID: PMC3458141 DOI: 10.1016/j.drugalcdep.2012.05.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Revised: 05/04/2012] [Accepted: 05/04/2012] [Indexed: 11/28/2022]
Abstract
BACKGROUND Attention deficit/hyperactivity disorder and depression have been found to be comorbid with smoking behaviors, and all three behavioral syndromes have been shown to be familially transmitted. The present paper reports on the results of analyses testing whether child attention deficit/hyperactivity disorder and depression symptoms were mediators in the intergenerational transmission of cigarette smoking. METHOD Path analyses using bootstrapped mediation procedures were conducted on data from a community sample of 764 families (one or both parents and one adolescent offspring) from the Indiana University Smoking Survey. Parents reported on their smoking behaviors, ADHD, and depression and their child's ADHD, while offspring reported on their smoking behaviors and depression. RESULTS Although fathers' and mothers' smoking status, depression, and ADHD were not significantly correlated with boys' smoking initiation, there was a significant mediated (indirect) pathway from mothers' depression to boys' smoking initiation through boys' depression. Several parental variables were significantly correlated with smoking initiation in girls, and the pathways from mothers' smoking status, mothers' ADHD, and fathers' smoking status to girls' smoking initiation were significantly mediated by girls' ADHD. CONCLUSIONS For adolescent girls, the intergenerational transmission of ADHD appears to be important in understanding the intergenerational transmission of cigarette smoking. Sex differences in the intergenerational transmission of psychopathology as it leads to smoking initiation were also discussed.
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Affiliation(s)
- Alex Zoloto
- Arizona State University, Tempe, AZ 85287-1104, USA
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15
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Hayatbakhsh R, Williams GM, Bor W, Najman JM. Early childhood predictors of age of initiation to use of cannabis: a birth prospective study. Drug Alcohol Rev 2012; 32:232-40. [PMID: 23061516 DOI: 10.1111/j.1465-3362.2012.00520.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 09/13/2012] [Indexed: 11/29/2022]
Abstract
INTRODUCTION AND AIMS Early age of cannabis use predicts subsequent illicit drug abuse and other psychosocial problems. Identification of factors associated with early cannabis use may contribute to the development of preventive interventions. This study aimed to examine the early life predictors of age of initiation to cannabis. DESIGN AND METHODS Data were from Mater Hospital and University of Queensland Study of Pregnancy, a population-based prospective birth cohort study. Participants were a cohort of 3488 young adults who self-reported frequency and age of onset of cannabis use at the 21 year follow up. RESULTS Of 3488 young adults, 48.9% (51.8% men and 46.4% women) reported having ever used cannabis. For those who had ever used cannabis, age of onset had mean and median of 15.8 and 16.0 years, respectively. In multivariate analysis child's gender, change in maternal marital status, quality of marital relationship, maternal cigarette smoking and alcohol consumption and maternal depression when the child was 5 years statistically significantly predicted age of initiation to cannabis use. DISCUSSION AND CONCLUSIONS The present study explores the impact of early childhood factors associated with age of onset of cannabis use. It is suggested that the family environment within which children are reared, including factors such as parents' marital circumstances, has a major influence on initiation to cannabis use in adolescence. Research is needed to disentangle the pathways of association between these early life factors and early initiation to use of cannabis.
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Affiliation(s)
- Reza Hayatbakhsh
- School of Population Health, University of Queensland, Brisbane, Australia.
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Ohmoto M, Sakaishi K, Hama A, Morita A, Nomura M, Mitsumoto Y. Association Between Dopamine Receptor 2 TaqIA Polymorphisms and Smoking Behavior With an Influence of Ethnicity: A Systematic Review and Meta-Analysis Update. Nicotine Tob Res 2012; 15:633-42. [DOI: 10.1093/ntr/nts196] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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17
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Abstract
Alcohol, nicotine, and caffeine are the most widely consumed psychotropic drugs worldwide. They are largely consumed by normal individuals, but their use is even more frequent in psychiatric patients, Thus, patients with schizophrenia tend to abuse all three substances. The interrelationships between depression and alcohol are complex. These drugs can all create dependence, as understood in the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). Alcohol abuse is clearly deleterious to the brain, provoking acute and chronic mental disorders, ranging from intoxication with impairment of cognition, to delirium tremens, halluosis, and dementia. In contrast, the main health consequences of nicotine, notably cancer and cardiovascular disases, lie outside the realm of psychiatry However, the mes of nicotine dependence and motivation to smoke or quit are of concern to psychiatrists.
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Affiliation(s)
- Marc-Antoine Crocq
- FORENAP, Institute for Research in Neuroscience and Neuropsychiatry, Rouffach, France
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18
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Abstract
Epidemiological studies of substance use and substance use disorders (SUDs) have provided an abundance of data on the patterns of substance use in nationally representative samples across the world (Degenhardt et al. in PLoS Med 5(7):e141, 2008; Johnston et al. in Monitoring the future national survey results on drug use, 1975-2010, vol I, secondary school students. Institute for Social Research, Ann Arbor, MI, 2011; SAMHSA in Results from the 2010 national survey on drug use and health: summary of national findings, vol NSDUH, series H-41, HHS Publication No. (SMA) 11-4658. Substance Abuse and Mental Health Services Administration, Rockville, 2011). This paper presents a summary of the goals, methods, and recent findings on the epidemiology of substance use and disorders in the general population of adults and adolescents and describes the methods and findings on the genetic epidemiology of drug use disorders. The high 12-month prevalence rates of substance dependence in US adults (about 12 % for alcohol and 2-3 % for illicit drugs) approximate those of other mental disorders as well as chronic physical disorders with major public health impact. New findings from the nationally representative samples of US youth reveal that the lifetime prevalence of alcohol use disorders is approximately 8 % and illicit drug use disorders is 2-3 % (Merikangas et al. in J Am Acad Child Adolesc Psychiatry 49(10):980-989, 2010; Swendsen et al. in Arch Gen Psychiatry 69(4):390-398, 2012; SAMHSA in Results from the 2010 national survey on drug use and health: summary of national findings, vol NSDUH, Series H-41, HHS Publication No. (SMA) 11-4658. Substance Abuse and Mental Health Services Administration, Rockville, 2011). The striking increase in prevalence rates from ages 13 to 18 highlight adolescence as the key period of development of SUDs. The application of genetic epidemiological studies has consistently demonstrated that genetic factors have a major influence on progression of substance use to dependence, whereas environmental factors unique to the individual play an important role in exposure and initial use of substances. Identification of specific susceptibility genes and environmental factors that influence exposure and progression of drug use may enhance our ability to prevent and treat SUDs.
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Budulac SE, Vonk JM, Postma DS, Siedlinski M, Timens W, Boezen MH. Nicotinic acetylcholine receptor variants are related to smoking habits, but not directly to COPD. PLoS One 2012; 7:e33386. [PMID: 22438921 PMCID: PMC3305325 DOI: 10.1371/journal.pone.0033386] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Accepted: 02/13/2012] [Indexed: 11/19/2022] Open
Abstract
Genome-wide association studies identified single nucleotide polymorphisms (SNPs) in the nicotinic acetylcholine receptors (nAChRs) cluster as a risk factor for nicotine dependency and COPD. We investigated whether SNPs in the nAChR cluster are associated with smoking habits and lung function decline, and if these potential associations are independent of each other. The SNPs rs569207, rs1051730 and rs8034191 in the nAChR cluster were analyzed in the Vlagtwedde-Vlaardingen cohort (n = 1,390) that was followed for 25 years. We used GEE and LME models to analyze the associations of the SNPs with quitting or restarting smoking and with the annual FEV(1) decline respectively. Individuals homozygote (CC) for rs569207 were more likely to quit smoking (OR (95%CI) = 1.58 (1.05-2.38)) compared to wild-type (TT) individuals. Individuals homozygote (TT) for rs1051730 were less likely to quit smoking (0.64 (0.42; 0.97)) compared to wild-type (CC) individuals. None of the SNPs was significantly associated with the annual FEV(1) decline in smokers and ex-smokers. We show that SNPs in the nAChR region are associated with smoking habits such as quitting smoking, but have no significant effect on the annual FEV(1) decline in smokers and ex-smokers, suggesting a potential role of these SNPs in COPD development via smoking habits rather than via direct effects on lung function.
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Affiliation(s)
- Simona E. Budulac
- Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Judith M. Vonk
- Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Dirkje S. Postma
- Department of Pulmonology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Mateusz Siedlinski
- Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Wim Timens
- Department of Pathology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Marike H. Boezen
- Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- * E-mail:
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Broms U, Silventoinen K, Madden PAF, Heath AC, Kaprio J. Genetic Architecture of Smoking Behavior: A Study of Finnish Adult Twins. Twin Res Hum Genet 2012. [DOI: 10.1375/twin.9.1.64] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
AbstractBoth genetic and environmental factors affect smoking initiation and maintenance, but less is known about the genetic architecture of various other smoking-related behaviors. The aim of this study is to examine the genetic architecture of smoking behavior in a large twin cohort. Questionnaires with an extensive smoking history section were mailed to same-sex adult twins of the Finnish twin cohort. The final study population included 2923 monozygotic and 6018 dizygotic twin pairs aged 24 to 88 years. Two-stage bivariate genetic modeling of age at initiation with amount smoked (less than 20 cigarettes per day vs. 20 or more) and age at initiation with smoking cessation was done by using the Mx statistical package. For men the heritability estimate for age at initiation was .59 (95% confidence interval [CI] .49–.69), for amount smoked .54 (95% CI .45–.62) and for smoking cessation .58 (95% CI .50–.65). For women the heritability estimates were .36 (95% CI .28–.43), .61 (95% CI .46–.70) and .50 (95% CI .39–.60), respectively. The genetic correlations between age at initiation and amount smoked or smoking cessation were at most .22 in magnitude, indicating that genetic influences in age at initiation accounted for at most about 4% of the genetic factors in amount smoked or in cessation. Genetic factors are important in amount smoked and smoking cessation and they are largely independent of genetic influences on age at initiation. This has implications for defining phenotypes in searches for genes underlying smoking behaviors.
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Heath AC, Martin NG, Lynskey MT, Todorov AA, Madden PAF. Estimating Two-Stage Models for Genetic Influences on Alcohol, Tobacco or Drug Use Initiation and Dependence Vulnerability in Twin and Family Data. ACTA ACUST UNITED AC 2012. [DOI: 10.1375/twin.5.2.113] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
AbstractGenetic research on risk of alcohol, tobacco or drug dependence must make allowance for the partial overlap of risk-factors for initiation of use, and risk-factors for dependence or other outcomes in users. Except in the extreme cases where genetic and environmental risk-factors for initiation and dependence overlap completely or are uncorrelated, there is no consensus about how best to estimate the magnitude of genetic or environmental correlations between Initiation and Dependence in twin and family data. We explore by computer simulation the biases to estimates of genetic and environmental parameters caused by model misspecification when Initiation can only be defined as a binary variable. For plausible simulated parameter values, the two-stage genetic models that we consider yield estimates of genetic and environmental variances for Dependence that, although biased, are not very discrepant from the true values. However, estimates of genetic (or environmental) correlations between Initiation and Dependence may be seriously biased, and may differ markedly under different two-stage models. Such estimates may have little credibility unless external data favor selection of one particular model. These problems can be avoided if Initiation can be assessed as a multiple-category variable (e.g. never versus early-onset versus later onset user), with at least two categories measurable in users at risk for dependence. Under these conditions, under certain distributional assumptions, recovery of simulated genetic and environmental correlations becomes possible. Illustrative application of the model to Australian twin data on smoking confirmed substantial heritability of smoking persistence (42%) with minimal overlap with genetic influences on initiation.
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Dickter CL, Forestell CA. Peering through the smoke: the effect of parental smoking behavior and addiction on daily smokers' attentional bias to smoking cues. Addict Behav 2012; 37:187-92. [PMID: 22036056 DOI: 10.1016/j.addbeh.2011.09.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 09/16/2011] [Accepted: 09/30/2011] [Indexed: 12/16/2022]
Abstract
Although previous research has demonstrated that individuals with parents who smoke are more likely to become smokers and are less successful in smoking cessation efforts compared with those without a smoking parent, the reasons for this link have not been established. In the current study, implicit attentional bias to smoking-related cues was investigated in college-age smokers, based on models of addiction that suggest that attention to drug-related cues plays an important role in drug addiction. Sixty-one participants completed a dot-probe task to measure attentional bias to smoking-related and matched non-smoking-related control pictures. Results indicated that while those who reported smoking occasionally did not demonstrate an attentional bias, daily smokers who had a smoking parent showed more of an attentional bias to the smoking cues than those without a smoking parent, but only to cues that did not contain human content. In addition to parental influence, nicotine dependence explained a significant portion of the variance in the attentional bias for daily smokers. Implications for models of nicotine addiction and the development of smoking cessation programs are discussed.
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Abstract
Tobacco addiction is a leading preventable cause of death worldwide and places a heavy social and financial burden on society. Therefore, ways of helping people to overcome nicotine dependence are a key element of strategies aimed at improving public health. Current treatments are only partially effective and there is a need to develop more efficient approaches to help smokers to stop. There exists a substantial genetic variability in smoking behavior and the likelihood of cessation - tailoring treatment according to an individual's genetic profile is now technologically feasible and could lead to more successful cessation attempts. Here we review studies of the genetic effects on smoking cessation in randomized controlled trials of pharmacological therapy and discuss the potential value of a personalized approach to help people stop smoking.
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Affiliation(s)
- Alistair J Brock
- School of Biological & Chemical Sciences, Queen Mary, University of London, UK.,Centre for Primary Care & Public Health, Barts & the London Medical School, Blizard Institute, Queen Mary, University of London, UK
| | - Andrea Takeda
- Centre for Primary Care & Public Health, Barts & the London Medical School, Blizard Institute, Queen Mary, University of London, UK
| | - Caroline Brennan
- School of Biological & Chemical Sciences, Queen Mary, University of London, UK
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Smerecnik C, Quaak M, van Schayck CP, van Schooten FJ, de Vries H. Are smokers interested in genetic testing for smoking addiction? A socio-cognitive approach. Psychol Health 2011; 26:1099-112. [PMID: 21678175 DOI: 10.1080/08870446.2010.541909] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Genetic advances have made genetically tailored smoking cessation treatments possible. In this study, we examined whether smokers are interested in undergoing a genetic test to identify their genetic susceptibility to nicotine addiction. In addition, we aimed to identify socio-cognitive determinants of smokers' intention to undergo genetic testing. Following the protection motivation theory (PMT), we assessed the following constructs using an online survey among 587 smokers: threat appraisal (i.e. susceptibility and severity), fear, coping appraisal (i.e. response efficacy and self-efficacy), response costs and intention. In addition, knowledge, social norms and information-seeking behaviour were measured. Mean intention rates were 2.57 on a 5-point scale. Intention was significantly associated with threat appraisal and coping appraisal, as predicted by the PMT. Fear of the outcome was negatively associated with the intention to undergo genetic testing, but response costs, knowledge and social influence were not. Intention to undergo genetic testing in turn was positively related to seeking information about genetic testing and genetically tailored smoking cessation treatments. Smokers seem ambivalent or 'on the fence' with regard to undergoing a genetic test for smoking addiction. Socio-cognitive concepts such as susceptibility, severity, response efficacy and self-efficacy may be used to inform or educate smokers about the value of genetically tailored smoking cessation treatments.
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Affiliation(s)
- Chris Smerecnik
- Department of Health Promotion, School for Public Health and Primary Care (CAPHRI), Maastricht University, Maastricht, The Netherlands.
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25
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Vink JM, Boomsma DI. Interplay between heritability of smoking and environmental conditions? A comparison of two birth cohorts. BMC Public Health 2011; 11:316. [PMID: 21569578 PMCID: PMC3112130 DOI: 10.1186/1471-2458-11-316] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 05/14/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Attitudes and policy towards smoking changed over the past years in many countries including the Netherlands. Generally, this led to a decrease in smoking prevalence. As demonstrated in twin and family studies, individual differences in smoking behavior are partly influenced by genetic factors. We explore whether the current change in environmental conditions has influenced the genetic architecture of smoking. This would constitute evidence for Gene × Environment (G×E) interaction. METHODS Data on smoking were available from 2 cohorts of young adult twins (18-25 year) registered with the Netherlands Twin Register. The first cohort completed a survey in 1993-1995 (n = 2669) and the second in 2009-2010 (n = 2339). Prevalence and genetic architecture of smoking were compared across cohorts using structural equation models in MX. RESULTS Smoking prevalence decreased from 40-51% to 22-23% between 1993-1995 and 2009-2010. Genetic analyses, making use of the different genetic resemblance in monozygotic and dizygotic twins, showed that the heritability was the same in both cohorts. CONCLUSIONS The change in policy and smoking attitudes that led to a decrease in prevalence of smoking did not change the heritability of smoking and thus no evidence was found for GxE interaction.
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Affiliation(s)
- Jacqueline M Vink
- Department of Biological Psychology, VU University, Amsterdam, The Netherlands
- Neuroscience Campus Amsterdam, Amsterdam, The Netherlands
| | - Dorret I Boomsma
- Department of Biological Psychology, VU University, Amsterdam, The Netherlands
- Neuroscience Campus Amsterdam, Amsterdam, The Netherlands
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26
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Sartor CE, Lessov-Schlaggar CN, Scherrer JF, Bucholz KK, Madden PA, Pergadia ML, Grant JD, Jacob T, Xian H. Initial response to cigarettes predicts rate of progression to regular smoking: findings from an offspring-of-twins design. Addict Behav 2010; 35:771-8. [PMID: 20385446 DOI: 10.1016/j.addbeh.2010.03.004] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Revised: 02/20/2010] [Accepted: 03/05/2010] [Indexed: 11/26/2022]
Abstract
The aim of this study was to examine the association between initial subjective effects from cigarettes and the rate of progression from first cigarette to regular smoking. Latent class analysis (LCA) was applied to subjective effects data from 573 offspring of twins ranging in age from 14 to 32 years. LCA revealed four classes: 1) High on both pleasurable and physiological responses, 2) Cough only response, 3) High on physiological, low on pleasurable responses, and 4) High on pleasurable, low on physiological responses. Classes of responses were then used to predict time from first cigarette to the onset of regular smoking in a Cox proportional hazards model. Time-varying covariates representing relevant psychiatric and psychosocial factors as well as dummy variables representing the offspring-of-twins design were included in the model. Members of classes 1 and 4 transitioned more rapidly to regular smoking than the classes characterized as low on the pleasurable response dimension. Our findings provide evidence that previously reported associations between pleasurable initial experiences and progression to regular smoking hold true as well for the rate at which that transition occurs. Furthermore, the fact that profiles of responses did not fall into global categories of exclusively pleasurable vs. exclusively negative (physiological) responses suggests the importance of considering both dimensions in combination to characterize risk for smoking-related outcomes.
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27
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Agrawal A, Silberg JL, Lynskey MT, Maes HH, Eaves LJ. Mechanisms underlying the lifetime co-occurrence of tobacco and cannabis use in adolescent and young adult twins. Drug Alcohol Depend 2010; 108:49-55. [PMID: 20047801 PMCID: PMC2835808 DOI: 10.1016/j.drugalcdep.2009.11.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2009] [Revised: 11/12/2009] [Accepted: 11/14/2009] [Indexed: 11/21/2022]
Abstract
Using twins assessed during adolescence (Virginia Twin Study of Adolescent Behavioral Development: 8-17 years) and followed up in early adulthood (Young Adult Follow-Up, 18-27 years), we tested 13 genetically informative models of co-occurrence, adapted for the inclusion of covariates. Models were fit, in Mx, to data at both assessments allowing for a comparison of the mechanisms that underlie the lifetime co-occurrence of cannabis and tobacco use in adolescence and early adulthood. Both cannabis and tobacco use were influenced by additive genetic (38-81%) and non-shared environmental factors with the possible role of non-shared environment in the adolescent assessment only. Causation models, where liability to use cannabis exerted a causal influence on the liability to use tobacco fit the adolescent data best, while the reverse causation model (tobacco causes cannabis) fit the early adult data best. Both causation models (cannabis to tobacco and tobacco to cannabis) and the correlated liabilities model fit data from the adolescent and young adult assessments well. Genetic correlations (0.59-0.74) were moderate. Therefore, the relationship between cannabis and tobacco use is fairly similar during adolescence and early adulthood with reciprocal influences across the two psychoactive substances. However, our study could not exclude the possibility that 'gateways' and 'reverse gateways', particularly within a genetic context, exist, such that predisposition to using one substance (cannabis or tobacco) modifies predisposition to using the other. Given the high addictive potential of nicotine and the ubiquitous nature of cannabis use, this is a public health concern worthy of considerable attention.
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Affiliation(s)
- Arpana Agrawal
- Washington University School of Medicine, Department of Psychiatry, St. Louis, MO 63110, United States.
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28
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Khokhar JY, Ferguson CS, Zhu AZX, Tyndale RF. Pharmacogenetics of drug dependence: role of gene variations in susceptibility and treatment. Annu Rev Pharmacol Toxicol 2010; 50:39-61. [PMID: 20055697 DOI: 10.1146/annurev.pharmtox.010909.105826] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Drug dependency is a highly prevalent mental health disorder that imposes a significant burden on those directly affected, health care systems, and society in general. There is substantial heritability in the susceptibility to drug addiction, which indicates that there are genetic risk factors. Variation in the human genome is abundant and can directly affect drug dependency phenotypes, for example, by altering the function of a gene product or by altering gene expression. Pharmacogenetic studies can assess the effects of genetic variation on the risk for a particular phenotype (e.g., being an alcoholic). In addition, pharmacogenetic variability in treatment efficacy and adverse reactions can be investigated to identify particular genetic variants associated with altered responses. This review highlights examples of genetic variations that are important in the development and maintenance of specific drug dependencies as well as those that affect the response to treatment.
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Affiliation(s)
- Jibran Y Khokhar
- The Center for Addiction and Mental Health and the Department of Pharmacology and Toxicology, University of Toronto, Ontario, Canada
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29
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Tindle H. Genetics of smoking behavior. Curr Cardio Risk Rep 2008. [DOI: 10.1007/s12170-008-0077-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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30
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Abstract
AIMS Attempts to further our understanding of the determinants of cigarette smoking, tobacco addiction and related behaviours have included the dissection of genetic influences on these phenotypes. This review summarizes the current state of evidence from both twin and adoption studies and molecular genetic studies. We also review future research horizons and the direction which studies of this kind are likely to take in the near future. FINDINGS There is consistent evidence from twin and adoption studies that genetic factors play a role in the aetiology of cigarette smoking. Nevertheless, despite a large number of candidate gene studies, and a smaller number of linkage studies, few reported associations and chromosomal regions of interest have proved to replicate reliably. This is due most probably to the small effects of individual loci on complex behaviours such as smoking. CONCLUSIONS Future research is likely to include the study of gene x environment interactions (including gene x treatment interactions, which offer the prospect of genetically tailored smoking cessation treatment) and the use of more sophisticated smoking-related phenotypes, such as longitudinal smoking trajectories, and intermediate phenotypes which use technologies such as neuroimaging and other laboratory and biobehavioural measures.
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Affiliation(s)
- Marcus R Munafò
- Department of Experimental Psychology, University of Bristol, Bristol, UK.
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31
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Agrawal A, Pergadia ML, Saccone SF, Hinrichs AL, Lessov-Schlaggar CN, Saccone NL, Neuman RJ, Breslau N, Johnson E, Hatsukami D, Montgomery GW, Heath AC, Martin NG, Goate AM, Rice JP, Bierut LJ, Madden PAF. Gamma-aminobutyric acid receptor genes and nicotine dependence: evidence for association from a case-control study. Addiction 2008; 103:1027-38. [PMID: 18482426 DOI: 10.1111/j.1360-0443.2008.02236.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS The gamma-aminobutyric acid receptor A (GABRA) gene clusters on chromosomes 4 and 5 have been examined previously for their association with alcohol and drug dependence phenotypes. Compelling evidence suggests that GABRA2 is associated with alcohol and drug dependence. However, no study has investigated whether genes in the GABA(A) gene clusters are associated with nicotine dependence, an important phenotype with a high correlation to persistent smoking, the single most preventable cause of mortality world-wide. DESIGN Using data on 1050 nicotine-dependent cases and 879 non-dependent smoking controls, we used logistic regression to examine the association between single nucleotide polymorphisms (SNPs) in 13 genes in the GABA(A) receptor system as well as GABBR2 (a GABA(B) gene). FINDINGS We found evidence for association between four SNPs in GABRA4, two SNPs in GABRA2 and one SNP in GABRE with nicotine dependence. These included a synonymous polymorphism in GABRA2 (rs279858), lying in a highly conserved region, which has been shown previously to be associated with alcohol and drug dependence. A non-synonymous polymorphism (rs16859834/rs2229940) in GABRA4, also highly conserved, was associated at P-value of 0.03. Significant haplotypes associated with nicotine dependence were found for GABRA2. No evidence for epistatic interactions were noted. Our study did not find evidence for an association between GABBR2 gene and nicotine dependence. CONCLUSIONS Given the potential role of compounds that enhance GABAergic neurotransmission in smoking cessation research, these findings have enormous potential for informing the wider field of addiction research.
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Affiliation(s)
- Arpana Agrawal
- Department of Psychiatry, Washington University School of Medicine, St Louis, MO 63110, USA.
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White VM, Byrnes GB, Webster B, Hopper JL. Does smoking among friends explain apparent genetic effects on current smoking in adolescence and young adulthood? Br J Cancer 2008; 98:1475-81. [PMID: 18319720 DOI: 10.1038/sj.bjc.6604250] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
We used data from a prospective cohort study of twins to investigate the influence of unmeasured genetic and measured and unmeasured environmental factors on the smoking behaviour of adolescents and young adults. Twins were surveyed in 1988 (aged 11-18 years), 1991, 1996 and 2004 with data from 1409, 1121, 732 and 758 pairs analysed from each survey wave, respectively. Questionnaires assessed the smoking behaviour of twins and the perceived smoking behaviour of friends and parents. Using a novel logistic regression analysis, we simultaneously modelled individual risk and excess concordance for current smoking as a function of zygosity, survey wave, parental smoking and peer smoking. Being concordant for having peers who smoked was a predictor of concordance for current smoking (P<0.001). After adjusting for peer smoking, monozygotic (MZ) pairs were no more alike than dizygotic pairs for current smoking at waves 2, 3 and 4. Genetic explanations are not needed to explain the greater concordance for current smoking among adult MZ pairs. However, if they are invoked, the role of genes may be due to indirect effects acting through the social environment. Smoking prevention efforts may benefit more by targeting social factors than attempting to identify genetic factors associated with smoking.
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Li MD. Identifying susceptibility loci for nicotine dependence: 2008 update based on recent genome-wide linkage analyses. Hum Genet 2008; 123:119-31. [PMID: 18205015 DOI: 10.1007/s00439-008-0473-0] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2007] [Accepted: 01/15/2008] [Indexed: 02/05/2023]
Abstract
Tobacco smoking is a severe health hazard worldwide, as nearly one-third of the global adult population smokes tobacco products. This high prevalence highlights the importance of studying the genetic determinants of nicotine dependence (ND). To identify such genetic factors, more than 20 genome-wide linkage studies have been conducted across different populations using a variety of ND assessment approaches, including smoking quantity (SQ), Heaviness of Smoking Index (HSI), Fagerström Test for Nicotine Dependence (FTND), ever-smoking, habitual smoking, or maximum number of cigarettes smoked in a 24-h period. This review provides a critical update on the progress during the years since our last review, published in 2004, in identifying susceptibility loci for ND. Although a significant number of reported genomic regions did not reach the level of "suggestive" or "significant" linkage and failed to be replicated in other independent studies, thirteen regions, located on chromosomes 3-7, 9-11, 17, 20, and 22, have been found to be suggestive or significant in at least two independent samples. Among them, the regions on chromosomes 9 (91.9-136.5 cM), 10, 11, and 17 have received the strongest support. A summary of eight regions that have been nominated for "significant" linkage to ND is provided.
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Affiliation(s)
- Ming D Li
- Department of Psychiatry and Neurobehavioral Sciences, Section of Neurobiology, University of Virginia, 1670 Discovery Drive, Suite 110, Charlottesville, VA 22911, USA.
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Abstract
Little is known about the natural history of drug dependence. This article describes the development and predictors of DSM-IV nicotine dependence in adolescence when tobacco use is initiated. In a two-stage design, a survey was administered to 6th-10th graders in the Chicago Public Schools to select a cohort of adolescents. Household interviews were conducted with adolescents five times and with one parent (predominantly mothers) three times over 2 years. The analytical sample includes 353 youths, who started using tobacco within 12 months preceding Wave 1 or between Waves 1-5. Survival analysis estimated latency to individual DSM-IV nicotine dependence criteria and the full dependence syndrome. Twenty-five percent of youths experienced the syndrome within 23 months of tobacco use onset. Tolerance, impaired control and withdrawal were experienced most frequently. Youths who developed full dependence experienced their first symptom faster after tobacco use onset than those who experienced only one criterion through the end of the observation period. Cox proportional hazards models estimated the importance of time-constant and time-varying sociodemographic, tobacco and other drug use, parental and peer smoking, social psychological and biological risk factors for experiencing the first criterion and the full syndrome. Pleasant initial sensitivity to tobacco and number of cigarettes smoked the prior month predicted both outcomes. Parental dependence predicted the full syndrome. Significant covariates were generally the same across gender and racial/ethnic subgroups. The predictive significance of the initial smoking experience and parental dependence highlight the potential importance of genetic factors in the etiology of nicotine dependence.
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Affiliation(s)
- Denise B Kandel
- Mailman School of Public Health, Columbia University, 722 W. 168th St., New York, NY 10032, United States.
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35
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Morley KI, Lynskey MT, Madden PAF, Treloar SA, Heath AC, Martin NG. Exploring the inter-relationship of smoking age-at-onset, cigarette consumption and smoking persistence: genes or environment? Psychol Med 2007; 37:1357-1367. [PMID: 17466111 DOI: 10.1017/s0033291707000748] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND We investigated the genetic and environmental contributions to covariation between smoking age-at-onset, cigarette consumption and smoking persistence. METHOD Multivariate biometrical modelling methods were applied to questionnaire data from Australian twins and their siblings (14 472 individuals from 6247 families). The contributions of genetic and environmental factors to covariation between the three traits were estimated, allowing for sex differences in both trait prevalence and the magnitude of genetic and environmental effects. RESULTS All traits were moderately heritable in males and females (estimates between 0.40 and 0.62), but there were sex differences in the extent to which additive genetic influences were shared across traits. Twin-specific environmental factors accounted for a substantial proportion of the variance in smoking age-at-onset in females (0.19) and males (0.12), but had little influence (<0.08) on other traits. Unique environmental factors were estimated to have a moderate influence on smoking age-at-onset (0.17 for females, 0.19 for males), but a stronger influence on other traits (between 0.39 and 0.49). CONCLUSIONS These results provide some insight into observed sex differences in smoking behaviour, and suggest that searching for pleiotropic genes may prove fruitful. However, further work on phenotypic definitions of smoking behaviour, particularly persistence, is warranted.
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Affiliation(s)
- Katherine I Morley
- Genetic Epidemiology Group, Queensland Institute of Medical Research, Queensland, Australia.
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36
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Lessov-Schlaggar CN, Pergadia ML, Khroyan TV, Swan GE. Genetics of nicotine dependence and pharmacotherapy. Biochem Pharmacol 2007; 75:178-95. [PMID: 17888884 PMCID: PMC2238639 DOI: 10.1016/j.bcp.2007.08.018] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 08/13/2007] [Accepted: 08/15/2007] [Indexed: 12/22/2022]
Abstract
Nicotine dependence is substantially heritable. Several regions across the genome have been implicated in containing genes that confer liability to nicotine dependence and variation in individual genes has been associated with nicotine dependence. Smoking cessation measures are also heritable, and measured genetic variation is associated with nicotine dependence treatment efficacy. Despite significant strides in the understanding of the relative contribution of genetic and environmental factors to nicotine dependence and treatment, emergent challenges necessitate interdisciplinary coordinated effort for effective problem solving. These challenges include refinement of the nicotine dependence phenotype, better understanding of the dynamic interplay between genes and environment in nicotine dependence etiology, application and development of molecular and statistical methodology that can adequately address vast amounts of data, and continuous translational cross-talk.
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Mineur YS, Picciotto MR. Genetics of nicotinic acetylcholine receptors: Relevance to nicotine addiction. Biochem Pharmacol 2007; 75:323-33. [PMID: 17632086 PMCID: PMC2212607 DOI: 10.1016/j.bcp.2007.06.010] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2007] [Revised: 06/04/2007] [Accepted: 06/07/2007] [Indexed: 10/23/2022]
Abstract
Human twin studies have suggested that there is a substantial genetic component underlying nicotine dependence, ongoing smoking and ability to quit. Similarly, animal studies have identified a number of genes and gene products that are critical for behaviors related to nicotine addiction. Classical genetic approaches, gene association studies and genetic engineering techniques have been used to identify the gene products involved in nicotine dependence. One class of genes involved in nicotine-related behavior is the family of nicotinic acetylcholine receptors (nAChRs). These receptors are the primary targets for nicotine in the brain. Genetic engineering studies in mice have identified a number of subunits that are critical for the ability of nicotine to activate the reward system in the brain, consisting of the dopaminergic cell bodies in the ventral tegmental area and their terminals in the nucleus accumbens and other portions of the mesolimbic system. In this review we will discuss the various lines of evidence suggesting that nAChRs may be involved in smoking behavior, and will review the human and animal studies that have been performed to date examining the genetic basis for nicotine dependence and smoking.
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Affiliation(s)
| | - Marina R. Picciotto
- * To whom correspondence should be addressed Marina R. Picciotto, Dept. of Psychiatry, Yale University School of Medicine, 34 Park Street – 3rd floor research, New Haven, CT 06508, Phone: 203-737-2041; Fax: 203-737-2043;
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David SP, Munafò MR, Murphy MFG, Proctor M, Walton RT, Johnstone EC. Genetic variation in the dopamine D4 receptor (DRD4) gene and smoking cessation: follow-up of a randomised clinical trial of transdermal nicotine patch. Pharmacogenomics J 2007; 8:122-8. [PMID: 17387332 PMCID: PMC2288552 DOI: 10.1038/sj.tpj.6500447] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Smokers of European ancestry (n=720) who participated in a double-blind, randomised, placebo-controlled trial of transdermal nicotine replacement therapy, were genotyped for two functional polymorphisms (variable number of tandem repeats (VNTR) and a C to T transition at position -521 (C-521T)) in the dopamine D4 receptor gene (DRD4) gene. Logistic regression models of abstinence at 12- and 26-week follow-ups were carried out separately for each polymorphism. For the DRD4 VNTR models, the main effect of treatment was significant at both 12-week (P=0.001) and 26-week (P=0.006) follow-ups, indicating an increased likelihood of successful cessation on active nicotine replacement therapy transdermal patch relative to placebo. The main effect of DRD4 VNTR genotype was associated with abstinence at 12-week follow-up (P=0.034), with possession of one or more copies of the long allele associated with reduced likelihood of cessation (17 vs 23%), but this effect was not observed at 26-week follow-up. For the DRD4 C-521T models, no main effect or interaction terms involving genotype were retained in the models at either 12- or 26-week follow-up. These data are consistent with observations from studies of the DRD2 gene that genetic variants related to relatively decreased dopaminergic tone in the mesocorticolimbic system are associated with increased risk for relapse to smoking following a cessation attempt.
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Affiliation(s)
- S P David
- Brown Medical School/Memorial Hospital of Rhode Island, Pawtucket, RI, USA.
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Vandenbergh DJ, O'Connor RJ, Grant MD, Jefferson AL, Vogler GP, Strasser AA, Kozlowski LT. Dopamine receptor genes (DRD2, DRD3 and DRD4) and gene-gene interactions associated with smoking-related behaviors. Addict Biol 2007; 12:106-16. [PMID: 17407504 DOI: 10.1111/j.1369-1600.2007.00054.x] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cigarette smoking, like many addictive behaviors, has a genetic component, and the dopamine D2-like receptor genes (DRD2, DRD3 and DRD4) are candidates for contributing to these behaviors. Phenotypic information concerning smoking-related behaviors from a nationally representative sample of research volunteers was analyzed for association with polymorphisms in these genes. Genotype status at the DRD2 intron 2 simple tandem repeat was related to cigarettes per day (P = 0.035) and heaviness of smoking index (P = 0.049). The presence of the glycine allele at the S9G polymorphism of the DRD3 gene was associated with frequency/quantity measures of smoking [log-transformed time to first cigarette (P = 0.031) and heaviness of smoking index (P = 0.035)]. There was a trend for DRD4 long alleles of the variable number of tandem repeats polymorphism to be associated with reduced severity of three withdrawal symptoms [desire/craving (P = 0.054); anger/irritability (P = 0.10); and trouble sleeping (P = 0.068)]. Interactions between genotypes at all three genes were associated with nervousness (P = 0.020) and trouble sleeping (P = 0.015). An interaction between DRD2 and DRD3 was found for trouble concentrating (P = 0.020). These relationships present possible dopamine-related responses to nicotine that warrant further study.
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Affiliation(s)
- David J Vandenbergh
- Department of Biobehavioral Health, The Pennsylvania State University, University Park, PA 16802-2321, USA
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40
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Abstract
Cigarette smoking increases the risk of numerous health problems, including cancer, cardiovascular and pulmonary disorders, making smoking the leading cause of preventable death in the world. Nicotine is primarily responsible for the highly addictive properties of cigarettes. Although the majority of smokers express a desire to quit, few are successful in doing so. Twin and family studies have indicated substantial genetic contributions to smoking behaviors. One major research focus has been to elucidate the specific genes involved; this has been accomplished primarily through genome-wide linkage analyses and candidate gene association studies. Much attention has focused on genes involved in the neurotransmitter pathways for the brain reward system and genes altering nicotine metabolism. This paper reviews the current state of knowledge for genetic factors implicated in smoking behaviors, and examines how genetic variations may affect therapeutic outcomes for drugs used to assist smoking cessation.
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Affiliation(s)
- M K Ho
- Centre for Addiction and Mental Health, Department of Pharmacology, University of Toronto, Toronto, Canada
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41
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Hamilton AS, Lessov-Schlaggar CN, Cockburn MG, Unger JB, Cozen W, Mack TM. Gender differences in determinants of smoking initiation and persistence in California twins. Cancer Epidemiol Biomarkers Prev 2006; 15:1189-97. [PMID: 16775180 DOI: 10.1158/1055-9965.epi-05-0675] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE To determine the effects of genetic versus environmental influences on smoking initiation (SI) and smoking persistence (SP). METHODS Native California twins (32,359 pairs), who completed a questionnaire in 1992 or 1998 to 2001, were studied. Standard epidemiologic and genetic analyses were conducted using multiple logistic regression and biometric models to determine factors related to smoking phenotype. RESULTS The strongest influence on SI was having a co-twin who ever smoked; the adjusted odds ratio was 9.7 [95% confidence limits (CL), 8.8-10.6] among monozygotic twins and 5.7 (95% CL, 5.2-6.2) among dizygotic like-sex pairs. The risk of SP was also increased if the co-twin currently smoked [adjusted odds ratios, 3.5 (95% CL, 3.0-4.1) for monozygotic twins and 2.3 (95% CL, 2.0-2.7) for like-sex dizygotic pairs]. The proportions of variance due to genetic effects, shared environment, and individual environment for SI were 31.6% (24.2-39.1), 47.5% (41.1-53.7), and 20.9% (18.8-23.1) for females, and 71.2% (66.7-75.4), 12.0% (8.7-15.7), and 16.7% (15.0-18.7) for males. For SP, estimates were identical by gender: 54.6% (43.6-65.5), 8.6% (0-17.1), and 36.8% (32.9-40.9). Modification of SI by closeness between twins was found, but little difference was seen for SP by closeness, birth cohort, or age. CONCLUSIONS Gender differences in the pattern of genetic and environmental determinants of SI indicate that gender-specific approaches may be needed for smoking prevention efforts. Modification of genetic effects by closeness between twins and birth cohort suggests that environmental interventions could reduce a heritable propensity to smoke. However, the apparently heritable tendency to continue smoking is unaffected by gender, age, birth cohort, or closeness between twins.
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Affiliation(s)
- Ann S Hamilton
- Department of Preventive Medicine, University of Southern California, Los Angeles, USA.
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Li XC, Karadsheh MS, Jenkins PM, Brooks JC, Drapeau JA, Shah MS, Lautner MA, Stitzel JA. Chromosomal loci that influence oral nicotine consumption in C57BL/6J x C3H/HeJ F2 intercross mice. Genes Brain Behav 2006; 6:401-10. [PMID: 17010155 DOI: 10.1111/j.1601-183x.2006.00266.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Several studies have demonstrated that there are genetic influences on free-choice oral nicotine consumption in mice. In order to establish the genetic architecture that underlies individual differences in free-choice nicotine consumption, quantitative trait loci (QTL) mapping was used to identify chromosomal regions that influence free-choice nicotine consumption in male and female F(2) mice derived from a cross between C57BL/6J and C3H/HeJ mice. These two mouse strains were chosen not only because they differ significantly for oral nicotine consumption, but also because they are at or near phenotypic extremes for all measures of nicotine sensitivity that have been reported. A four-bottle choice paradigm was used to assess nicotine consumption over an 8-day period. The four bottles contained water or water supplemented with 25, 50 or 100 microg/ml of nicotine base. Using micrograms of nicotine consumed per milliliter of total fluid consumed per day as the nicotine consumption phenotype, four significant QTL were identified. The QTL with the largest LOD score was located on distal chromosome 1 (peak LOD score = 15.7). Other chromosomes with significant QTL include central chromosome 4 (peak LOD score = 4.1), proximal chromosome 7 (peak LOD score = 6.1) and distal chromosome 15 (peak LOD score = 4.8). These four QTL appear to be responsible for up to 62% of the phenotypic variance in oral nicotine consumption.
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Affiliation(s)
- X C Li
- Department of Pharmacology, University of Michigan Medical School, Ann Arbor, MI, USA
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43
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Lessov-Schlaggar CN, Pang Z, Swan GE, Guo Q, Wang S, Cao W, Unger JB, Johnson CA, Lee L. Heritability of cigarette smoking and alcohol use in Chinese male twins: the Qingdao twin registry. Int J Epidemiol 2006; 35:1278-85. [PMID: 16847025 DOI: 10.1093/ije/dyl148] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND China has the world's largest concentration of smokers (350 million) and rising alcohol consumption, yet little is known about tobacco and alcohol use aetiology. In 2000, the Chinese National Twin Registry was established to provide a genetically informative resource for investigation of health behaviour including tobacco and alcohol use. METHODS Using standard twin methodology, this study aimed to examine the relative contribution of genetic and environmental influences on cigarette smoking and alcohol drinking in a sample of adult Chinese twins (n = 1010 individual twins). More than half of the male twins were smokers (58%), and 32.5% reported alcohol consumption. Among male smokers, 46.4% smoked 20 or more cigarettes per day (heavy smokers) and among drinkers, 32.8% consumed one or more drinks per day. Nearly all female twins were non-smokers (99.2%) and non-drinkers (98.7%); therefore, genetic analysis was limited to male data. RESULTS In men, current smoking was significantly heritable [75.1%, 95% confidence interval (CI) 56.7-87.5] with no evidence for a significant contribution of shared environmental effects. Heavy smoking was more strongly influenced by genes (66.2%, 95% CI 0-88.4) than shared environment (8.7%, 95% CI 0-71.0). Similarly, current drinking was more strongly influenced by genetic effects (59.5%, 95% CI 0-87.8) than by shared environmental effects (15.3%, 95% CI 0-72.1). Amount of alcohol consumed was influenced to a similar degree by genetic (42.4%, 95% CI 0-91.8) and shared environmental factors (39.2%, 95% CI 0-82.7). CONCLUSIONS These results support findings from twins of Western origin on the aetiology of tobacco and alcohol use and encourage further work in Chinese twins.
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Maes HH, Neale MC, Kendler KS, Martin NG, Heath AC, Eaves LJ. Genetic and Cultural Transmission of Smoking Initiation: An Extended Twin Kinship Model. Behav Genet 2006; 36:795-808. [PMID: 16810566 DOI: 10.1007/s10519-006-9085-4] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2005] [Accepted: 05/18/2006] [Indexed: 11/30/2022]
Abstract
BACKGROUND Considerable evidence from twin and adoption studies indicates that genetic and shared environmental factors play a significant role in the initiation of smoking behavior. Although twin and adoption designs are powerful to detect genetic and environmental influences, they do not provide information on the processes of assortative mating and parent-offspring transmission and their contribution to the variability explained by genetic and/or environmental factors. METHODS We examined the role of genetic and environmental factors for smoking initiation using an extended kinship design. This design allows the simultaneous testing of additive and non-additive genetic, shared and individual-specific environmental factors, as well as sex differences in the expression of genes and environment in the presence of assortative mating and combined genetic and cultural transmission. A dichotomous lifetime smoking measure was obtained from twins and relatives in the Virginia 30,000 sample. RESULTS Results demonstrate that both genetic and environmental factors play a significant role in the liability to smoking initiation. Major influences on individual differences appeared to be additive genetic and unique environmental effects, with smaller contributions from assortative mating, shared sibling environment, twin environment, cultural transmission and resulting genotype-environment covariance. The finding of negative cultural transmission without dominance led us to investigate more closely two possible mechanisms for the lower parent-offspring correlations compared to the sibling and DZ twin correlations in subsets of the data: (i) age x gene interaction, and (ii) social homogamy. Neither mechanism provided a significantly better explanation of the data, although age regression was significant. CONCLUSIONS This study showed significant heritability, partly due to assortment, and significant effects of primarily non-parental shared environment on smoking initiation.
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Affiliation(s)
- Hermine H Maes
- Department of Human Genetics, Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, 980003, 23298-0003, Richmond, VA 23298-0003, USA.
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Abstract
Gene-environment interplay is a general term that covers several divergent concepts with different meanings and different implications. In this review, we evaluate research evidence on four varieties of gene-environment interplay. First, we consider epigenetic mechanisms by which environmental influences alter the effects of genes. Second, we focus on variations in heritability according to environmental circumstances. Third, we discuss what is known about gene-environment correlations. Finally, we assess concepts and findings on the interaction between specific identified genes and specific measured environmental risks. In order to provide an understanding of what may be involved in gene-environment interplay, we begin our presentation with a brief historical review of prevailing views about the role of genetic and environmental factors in the causation of mental disorders, and we provide a simplified account of some of the key features of how genes 'work'.
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46
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Pergadia ML, Heath AC, Agrawal A, Bucholz KK, Martin NG, Madden PAF. The implications of simultaneous smoking initiation for inferences about the genetics of smoking behavior from twin data. Behav Genet 2006; 36:567-76. [PMID: 16477519 DOI: 10.1007/s10519-005-9042-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2005] [Accepted: 12/22/2005] [Indexed: 10/25/2022]
Abstract
We examined early social influences across stages of smoking within the context of a twin study using an environmental exposure specific to smoking: whether twins started smoking at the same time ("simultaneous smoking initiation": SSI). We expected that SSI would be a good index of shared social influences on smoking initiation. Rates of SSI were indeed significantly higher in MZ twins and in twins who shared peers and classes, as well as in male twins. With the exception of regular smoking in females, we found no significant difference in estimates of genetic and environmental parameters between SSI and non-SSI pairs for any of the smoking measures that we examined (DSM-IV and Fagerstrom HSI measures of nicotine dependence; DSM-IV nicotine withdrawal; heavy smoking; and in males, regular smoking). For regular smoking in females, allowing for additional shared environmental influences associated with SSI only modestly reduced our estimates of additive genetic variance (56% vs. 68%). These results indicate the important social influences that may occur for smoking initiation do not appear to seriously bias estimates of genetic effects on later stages of smoking.
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Affiliation(s)
- Michele L Pergadia
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63100, USA.
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47
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Li XC, Karadsheh MS, Jenkins PM, Stitzel JA. Genetic correlation between the free-choice oral consumption of nicotine and alcohol in C57BL/6J × C3H/HeJ F2 intercross mice. Behav Brain Res 2005; 157:79-90. [PMID: 15617774 DOI: 10.1016/j.bbr.2004.06.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2003] [Revised: 05/28/2004] [Accepted: 06/11/2004] [Indexed: 11/18/2022]
Abstract
Previous studies in humans have demonstrated a high co-morbidity between alcoholism and smoking. This co-morbidity between alcohol and nicotine dependence can be attributed, in part, to common genetic factors. In rodents, behavioral and physiological responses to alcohol and nicotine also appear to share common genetic influences. In this report, the genetic correlation between free-choice oral nicotine and oral alcohol consumption was evaluated using an ascending two-bottle choice paradigm in C57BL/6xC3H/HeJ F2 intercross mice. For all concentrations of nicotine (25, 50, and 100 microg/ml) and alcohol (3, 6, and 10%) tested, nicotine consumption was significantly correlated with alcohol consumption. Nicotine consumption at the highest nicotine concentration tested (100 microg/ml) showed low, but significant, correlations with the number of [3H]-cytisine binding sites in the hippocampus (r=0.307) and the number of [125I]-alpha-bungarotoxin binding sites in the cortex (r=-0.328). No significant correlations between alcohol consumption and the number of either [3H]-cytisine or [125I]-alpha-bungarotoxin binding sites was observed. A polymorphism in the nicotinic receptor alpha4 subunit gene, Chrna4, showed a trend with nicotine consumption and a significant association with alcohol consumption in female but not male mice. These results indicate that common genetic factors influence nicotine and alcohol consumption in mice. However, neither individual differences in the expression of [3H]-cytisine or [125I]-alpha-bungarotoxin binding nicotinic receptors nor the polymorphism in Chrna4 likely contribute to the genetic overlap that influences the consumption of both of these drugs of abuse in C57BL/6xC3H/HeJ F2 mice.
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Affiliation(s)
- Xiao C Li
- Department of Integrative Physiology, Institute for Behavioral Genetics, University of Colorado, Boulder, CO 80309, USA
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48
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Abstract
Smoking behaviour is influenced by both genetic and environmental factors. Many years of twin and adoption studies have demonstrated that heritability is at least 50% responsible for both smoking initiation and smoking persistence. Furthermore, the extent, to which genetic and environmental factors contribute to smoking behaviour, is significantly different in men and women. Linkage analyses from several independent studies provide evidences for suggested linkage of smoking behaviour to chromosomes 1, 2, 4, 5, 6, 9, 10, 11, 14, 17, 18 and 21. However, almost none of these loci have been replicated yet. Furthermore, numerous population-based association studies have been performed to examine the effects of a number of candidate genes, such as cytochrome P450, dopamine receptor (DR) and transporter, serotonin transporter and nicotinic acetylcholine receptor, on smoking behaviour. However, many of these reports have not yet received independent confirmation. Of these candidate genes, the D2 dopamine receptor (DRD2) gene has been extensively studied. Meta-analysis of 12 reported studies showed a significantly higher prevalence of the DRD2 TaqI A1 allele in smokers than that in non-smokers (p < 0.0001; pooled OR = 1.50; 95% CI = 1.33-1.70). For other candidate genes, insufficient published studies are available to allow a meta-analysis to be performed, or meta-analysis showed no significant difference between smokers and non-smokers. More studies are necessary to determine whether these genes play a significant role in smoking behaviour.
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Affiliation(s)
- M D Li
- Program in Genomics and Bioinformatics on Drug Addiction, Department of Psychiatry, The University of Texas Health Science Center, Floyd Curl Drive, San Antonio 78229, USA.
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Berrettini W, Bierut L, Crowley TJ, Cubells JF, Frascella J, Gelernter J, Hewitt JK, Kreek MJ, Lachman H, Leppert M, Li MD, Madden P, Miner C, Pollock JD, Pomerleau O, Rice JP, Rutter JL, Shurtleff D, Swan GE, Tischfield JA, Tsuang M, Uhl GR, Vanyukov M, Volkow ND, Wanke K. Setting priorities for genomic research. Science 2004; 304:1445-7; author reply 1445-7. [PMID: 15178784 DOI: 10.1126/science.304.5676.1445c] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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50
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Abstract
Drug use is a complex behavior influenced by multiple biological, family, and sociocultural factors. The concurrent use/misuse of multiple drugs is often seen and drug use also co-occurs with other psychiatric conditions. Behavior and molecular genetic studies support an important posited role of genes in drug use. This posited genetic risk does not appear to be conferred by one or two major genes manifesting large effects, but rather by a number of genes manifesting smaller effects. Genetic factors explain, on average, only about half of the total variability in drug use, with the remaining variability influenced by environmental factors. Also, genetic risk may be differentially expressed in the presence vs. absence of particular environmental conditions. Thus, investigation of environmental factors and their interaction with genetic risk is a necessary component of genetic research. While the full potential of genetic investigations for the prevention of drug misuse has yet to be realized, an example of the impact of risk factor modification under various conditions of gene-environment interaction is provided, and the implications for use of genetic information in drug-misuse prevention are discussed. The multifactorial nature of drug use necessitates coordinated investigation from multiple disciplines and timely dissemination of scientific findings. In addition, this work demands adherence to the highest standards of confidentiality and ethical use of genetic information to best inform future prevention efforts.
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Affiliation(s)
- Christina N Lessov
- Center for Health Sciences, SRI International, Menlo Park, California 94025, USA.
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