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Deng WQ, Belisario K, Munafò MR, MacKillop J. Longitudinal characterization of impulsivity phenotypes boosts signal for genomic correlates and heritability. Mol Psychiatry 2025; 30:608-618. [PMID: 39181994 DOI: 10.1038/s41380-024-02704-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Revised: 08/14/2024] [Accepted: 08/16/2024] [Indexed: 08/27/2024]
Abstract
Genomic correlates of impulsivity have been identified in several genome-wide association studies (GWAS) using cross-sectional designs, but no studies have investigated the molecular genetic correlates of impulsivity phenotypes using longitudinally constructed traits. In 3860 unrelated European participants in the Avon Longitudinal Study of Parents and Children (ALSPAC), we constructed longitudinal phenotypes for delay discounting and impulsive personality traits (as measured by the UPPS-P impulsive behavior scales) via assessment at ages 24, 26, and 28. We conducted GWASs of impulsivity using both cross-sectional and longitudinal phenotypes, estimated heritability and their phenotypic and genetic correlations, and evaluated their association with recently-developed polygenic risk scores (PRSs) for the impulsivity indicators themselves and also related psychiatric conditions. Latent growth curve modeling revealed a stable intercept over time for all impulsivity phenotypes. High genetic correlation of cross-sectional measures over time suggested a stable genetic component for delay discounting (rg = 0.53-0.99) and sensation seeking (rg = 0.99). Heritability estimates of the stable longitudinal phenotypes substantively improved as compared to their cross-sectional counterparts, revealing a significant SNP-heritability for delay discounting (0.22; p = 0.03) and sensation seeking (0.35; p = 0.0007). Consistent with previous reports, GWAS and gene-based analyses revealed associations between specific longitudinal impulsivity indicators and CADM2 and NCAM1 genes. The PRSs for the impulsivity indicators and disorders related to self-regulation were also significantly associated with longitudinal impulsivity traits. Finally, we validated the associations between longitudinal impulsivity phenotypes and their PRSs in an independent 13-wave longitudinal study (n = 1019) and the benefit of longitudinal phenotypes in simulation studies. In this first longitudinal genetic study of impulsivity traits, the results revealed stable genomic correlates of delay discounting and sensation seeking over time and further validated the utility of recently-developed PRSs, both in relation to the observed traits and in connecting them to psychiatric disorders. More generally, these findings support using latent intercepts as novel longitudinal phenotypes to boost signal for heritability and genomic correlates of mechanisms contributing to psychiatric disease liability.
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Affiliation(s)
- Wei Q Deng
- Peter Boris Centre for Addictions Research, St. Joseph's Healthcare Hamilton, Hamilton, ON, Canada.
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada.
| | - Kyla Belisario
- Peter Boris Centre for Addictions Research, St. Joseph's Healthcare Hamilton, Hamilton, ON, Canada
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada
| | - Marcus R Munafò
- School of Psychological Science, University of Bristol, Bristol, UK
- MRC Integrative Epidemiology Unit, University of Bristol, Bristol, UK
| | - James MacKillop
- Peter Boris Centre for Addictions Research, St. Joseph's Healthcare Hamilton, Hamilton, ON, Canada.
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada.
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2
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Duncan MS, Diaz-Zabala H, Jaworski J, Tindle HA, Greevy RA, Lipworth L, Hung RJ, Freiberg MS, Aldrich MC. Interaction between Continuous Pack-Years Smoked and Polygenic Risk Score on Lung Cancer Risk: Prospective Results from the Framingham Heart Study. Cancer Epidemiol Biomarkers Prev 2024; 33:500-508. [PMID: 38227004 PMCID: PMC10988206 DOI: 10.1158/1055-9965.epi-23-0571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 10/13/2023] [Accepted: 01/11/2024] [Indexed: 01/17/2024] Open
Abstract
BACKGROUND Lung cancer risk attributable to smoking is dose dependent, yet few studies examining a polygenic risk score (PRS) by smoking interaction have included comprehensive lifetime pack-years smoked. METHODS We analyzed data from participants of European ancestry in the Framingham Heart Study Original (n = 454) and Offspring (n = 2,470) cohorts enrolled in 1954 and 1971, respectively, and followed through 2018. We built a PRS for lung cancer using participant genotyping data and genome-wide association study summary statistics from a recent study in the OncoArray Consortium. We used Cox proportional hazards regression models to assess risk and the interaction between pack-years smoked and genetic risk for lung cancer adjusting for European ancestry, age, sex, and education. RESULTS We observed a significant submultiplicative interaction between pack-years and PRS on lung cancer risk (P = 0.09). Thus, the relative risk associated with each additional 10 pack-years smoked decreased with increasing genetic risk (HR = 1.56 at one SD below mean PRS, HR = 1.48 at mean PRS, and HR = 1.40 at one SD above mean PRS). Similarly, lung cancer risk per SD increase in the PRS was highest among those who had never smoked (HR = 1.55) and decreased with heavier smoking (HR = 1.32 at 30 pack-years). CONCLUSIONS These results suggest the presence of a submultiplicative interaction between pack-years and genetics on lung cancer risk, consistent with recent findings. Both smoking and genetics were significantly associated with lung cancer risk. IMPACT These results underscore the contributions of genetics and smoking on lung cancer risk and highlight the negative impact of continued smoking regardless of genetic risk.
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Affiliation(s)
- Meredith S. Duncan
- Department of Biostatistics, University of Kentucky, Lexington, Kentucky
- Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Hector Diaz-Zabala
- Division of Epidemiology, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - James Jaworski
- Division of Genetic Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Hilary A. Tindle
- Geriatric Research Education and Clinical Centers (GRECC), Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee
- Division of Internal Medicine, Vanderbilt University Medical Center, Nashville Tennessee
| | - Robert A. Greevy
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Loren Lipworth
- Division of Epidemiology, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Rayjean J. Hung
- Prosserman Centre for Population Health Research, Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, Ontario, Canada
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
| | - Matthew S. Freiberg
- Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
- Geriatric Research Education and Clinical Centers (GRECC), Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee
| | - Melinda C. Aldrich
- Division of Genetic Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
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Das S, Jena PK, Satpathy N, Kishore J, Ak K, Epari V, Gadtia R. Performance of the Heaviness of Smoking Index in Indian Settings. Cureus 2023; 15:e50433. [PMID: 38222207 PMCID: PMC10785195 DOI: 10.7759/cureus.50433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2023] [Indexed: 01/16/2024] Open
Abstract
Background and objective The heaviness of smoking index (HSI) is a popular tool to assess nicotine dependence in clinical and community settings. Low cigarette consumption and concurrent use of other tobacco products raise concerns about its validity in Indian settings. This study explores the performance of HSI in Indian settings. Methods This study analyzed daily manufactured cigarette smoker data from the cross-sectional Global Adult Tobacco Surveys (GATS) from its first (GAST-1, 2009) and second waves (GATS-2, 2016), both of which were available in the public domain. The HSI scores were calculated based on the number of cigarettes smoked per day (CPD) and time to first smoke (TTFS) after waking up among the current daily cigarette users. This study examined the utility of the HSI scale in Indian settings by estimating the predictability of low dependence on quit attempts and quit intentions using the likelihood ratio parameter. Results About nine in 10 cigarette users in India consumed less than 10 cigarettes per day, yielding a low score on the HSI scale for most of the daily cigarette users. The majority of daily cigarette smokers scored ≤ 1 (low dependence) on the HSI scale both in GATS-1 and GATS-2, irrespective of their exclusive cigarette use status. The absolute value and the 95% confidence limit of positive likelihood ratios (falling below and above one) suggest that the predictability of low dependence on quit attempts and quit intention in the Indian setting is limited. Conclusions The utility of the HSI scale in assessing nicotine dependence among cigarette users in India is limited. This may be attributed to low average cigarette consumption, concurrent use of various tobacco products, and the sociocultural milieu of Indian smokers. This highlights the need for a new rapid nicotine dependence scale tailored to the specific patterns of tobacco use behavior prevalent in the Indian context.
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Affiliation(s)
- Sagarika Das
- Nursing, Shri Jagdishprasad Jhabarmal Tibrewala (JJT) University, Jhunjhunu, IND
- Mental Health Nursing, Central Institute of Psychiatry, Ranchi, IND
| | - Pratap K Jena
- Health Care Management, Swiss School of Business and Management (SSBM) Geneva, Geneva, CHE
- Public Health, School of Public Health, Kalinga Institute of Industrial Technology (KIIT), Bhubaneswar, IND
| | - Nancy Satpathy
- Community Medicine, Institute of Medical Sciences and SUM Hospital, Siksha 'O' Anusandhan, Deemed to be University, Bhubaneswar, IND
| | - Jugal Kishore
- Community Medicine, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, IND
| | - Kavitha Ak
- Public Health, Indian Medical Council of Medical Research (ICMR) Regional Medical Research Centre, Bhubaneswar, IND
| | - Venkatarao Epari
- Community Medicine, Institute of Medical Sciences and SUM Hospital, Siksha 'O' Anusandhan, Deemed to be University, Bhubaneswar, IND
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Pivac N, Nedic Erjavec G, Sagud M, Nikolac Perkovic M, Tudor L, Uzun S, Kovacic Petrovic Z, Konjevod M, Dvojkovic A, Kozumplik O, Svob Strac D, Peraica T, Mimica N, Zivkovic M, Hirasawa-Fujita M, Domino EF. The association between BDNF C270T genetic variants and smoking in patients with mental disorders and in healthy controls. Prog Neuropsychopharmacol Biol Psychiatry 2022; 113:110452. [PMID: 34637871 DOI: 10.1016/j.pnpbp.2021.110452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 09/27/2021] [Accepted: 10/05/2021] [Indexed: 11/25/2022]
Abstract
Studies investigating the association between smoking and the brain-derived neurotrophic factor (BDNF) Val66Met polymorphism have reported inconclusive results, while the studies on the association of smoking status with BDNF C270T polymorphism are missing. We aimed to determine the association of smoking and BDNF Val66Met and C270T genetic variants in control subjects and patients with mental disorders. This study included 3502 Caucasian subjects: 918 healthy controls and 2584 patients with mental disorders (519 individuals with posttraumatic stress disorder (PTSD), 419 patients with depression, 996 patients with schizophrenia, and 650 patients with alcohol dependence). The frequency of the BDNF Val66Met and C270T variants were presented in codominant, dominant and recessive models. BDNF C270T, but not BDNF Val66Met polymorphism, was significantly associated with smoking in all groups, since the presence of the C270T T allele was more frequently found in smokers compared to non-smokers. Significant predictors of smoking were sex, age and BDNF C270T genetic variants. However, after detailed analysis of the separate diagnostic entities, the significant association of BDNF C270T polymorphism was confirmed only in healthy subjects, but not in patients with mental disorders; and was not related to number of cigarettes smoked per day. In patients with alcohol dependence, the severity of smoking was significantly associated with BDNF Val66Met variants. This is a first report of the significant association between the BDNF C270T polymorphism and smoking status in the large groups of Caucasian cases/controls.
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Affiliation(s)
- Nela Pivac
- Rudjer Boskovic Institute, Zagreb, Croatia.
| | | | - Marina Sagud
- University Hospital Center Zagreb, Zagreb, Croatia; The University of Zagreb School of Medicine, Zagreb, Croatia
| | | | | | - Suzana Uzun
- University Psychiatric Hospital Vrapce, Zagreb, Croatia; School of Medicine, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
| | - Zrnka Kovacic Petrovic
- The University of Zagreb School of Medicine, Zagreb, Croatia; University Psychiatric Hospital Vrapce, Zagreb, Croatia
| | | | | | - Oliver Kozumplik
- University Psychiatric Hospital Vrapce, Zagreb, Croatia; School of Medicine, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
| | | | | | - Ninoslav Mimica
- The University of Zagreb School of Medicine, Zagreb, Croatia; University Psychiatric Hospital Vrapce, Zagreb, Croatia
| | | | | | - Edward F Domino
- University of Michigan, Department of Pharmacology, Ann Arbor, MI, USA
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Pradhan RK, Ramakrishna W. Transposons: Unexpected players in cancer. Gene 2022; 808:145975. [PMID: 34592349 DOI: 10.1016/j.gene.2021.145975] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 09/19/2021] [Accepted: 09/24/2021] [Indexed: 12/21/2022]
Abstract
Transposons are repetitive DNA sequences encompassing about half of the human genome. They play a vital role in genome stability maintenance and contribute to genomic diversity and evolution. Their activity is regulated by various mechanisms considering the deleterious effects of these mobile elements. Various genetic risk factors and environmental stress conditions affect the regulatory pathways causing alteration of transposon expression. Our knowledge of the biological role of transposons is limited especially in various types of cancers. Retrotransposons of different types (LTR-retrotransposons, LINEs and SINEs) regulate a plethora of genes that have a role in cell reprogramming, tumor suppression, cell cycle, apoptosis, cell adhesion and migration, and DNA repair. The regulatory mechanisms of transposons, their deregulation and different mechanisms underlying transposon-mediated carcinogenesis in humans focusing on the three most prevalent types, lung, breast and colorectal cancers, were reviewed. The modes of regulation employed include alternative splicing, deletion, insertion, duplication in genes and promoters resulting in upregulation, downregulation or silencing of genes.
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Abstract
Cigarette smoking is the leading cause of chronic obstructive pulmonary disease (COPD) worldwide. Smoking cessation is thus integral to the treatment of COPD. Nicotine addiction is a disease dependent on the complex interactions of neurotransmitter pathways, conditioned behaviors, environmental cues, genetic predisposition, and personal life circumstances, which render some more susceptible to tobacco abuse than others. The most successful smoking cessation programs are individualized, comprehensive, and utilize combinations of clinician counseling, behavioral reinforcement, community resources, advanced technology support (eg, smartphone apps, and Internet Web sites), and pharmacotherapy (both nicotine-based and nonnicotine medications). E-cigarettes were introduced to the US market in 2006 and touted as a safer alternative to tobacco cigarette smoking. Unfortunately, over the last 5 to 10 years, recreational e-cigarette use, or "vaping," has increased in popularity, especially among adolescents. This has introduced nicotine addiction to an entire generation of nonsmokers and resulted in numerous cases of acute lung disease, now known as e-cigarette or vape product use-associated lung injury (EVALI). In light of these adverse events, e-cigarettes and vape products are not currently recommended as a smoking cessation aid.
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Affiliation(s)
- Briana DiSilvio
- Division of Pulmonary Critical Care Medicine, Allegheny Health Network, Allegheny General Hospital, Pittsburgh, Pennsylvania
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Mahajan SD, Homish GG, Quisenberry A. Multifactorial Etiology of Adolescent Nicotine Addiction: A Review of the Neurobiology of Nicotine Addiction and Its Implications for Smoking Cessation Pharmacotherapy. Front Public Health 2021; 9:664748. [PMID: 34291026 PMCID: PMC8287334 DOI: 10.3389/fpubh.2021.664748] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 05/24/2021] [Indexed: 12/14/2022] Open
Abstract
Nicotine is the primary pharmacologic component of tobacco, and its highly addictive nature is responsible for its widespread use and significant withdrawal effects that result in challenges to smoking cessation therapeutics. Nicotine addiction often begins in adolescence and this is at least partially attributed to the fact that adolescent brain is most susceptible to the neuro-inflammatory effects of nicotine. There is increasing evidence for the involvement of microglial cells, which are the brain's primary homeostatic sensor, in drug dependence and its associated behavioral manifestations particularly in the adolescent brain. A hallmark of neuro-inflammation is microglial activation and activation of microglia by nicotine during adolescent development, which may result in long-term addiction to nicotine. This non-systematic review examines multifactorial etiology of adolescent nicotine addiction, neurobiology of nicotine addiction and the potential mechanisms that underlie the effects of nicotine on inflammatory signaling in the microglia, understanding how nicotine affects the adolescent brain. We speculate, that modulating homeostatic balance in microglia, could have promising therapeutic potential in withdrawal, tolerance, and abstinence-related neural adaptations in nicotine addiction, in the adolescent brain. Further, we discuss nicotine addiction in the context of the sensitization-homeostasis model which provides a theoretical framework for addressing the potential role of microglial homeostasis in neural adaptations underlying nicotine abuse.
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Affiliation(s)
- Supriya D. Mahajan
- Department of Community Health and Health Behavior, School of Public Health, University at Buffalo, Buffalo, NY, United States
| | - Gregory G. Homish
- Department of Community Health and Health Behavior, School of Public Health, University at Buffalo, Buffalo, NY, United States
| | - Amanda Quisenberry
- Department of Health Behavior, Roswell Park Comprehensive Cancer Center, Buffalo, NY, United States
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Risner VA, Benca-Bachman CE, Bertin L, Smith AK, Kaprio J, McGeary JE, Chesler E, Knopik V, Friedman N, Palmer RHC. Multi-polygenic Analysis of Nicotine Dependence in Individuals of European Ancestry. Nicotine Tob Res 2021; 23:2102-2109. [PMID: 34008017 DOI: 10.1093/ntr/ntab105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 05/14/2021] [Indexed: 11/12/2022]
Abstract
INTRODUCTION Heritability estimates of nicotine dependence (ND) range from 40-70%, but discovery GWAS of ND are underpowered and have limited predictive utility. In this work, we leverage genetically correlated traits and diseases to increase the accuracy of polygenic risk prediction. METHODS We employed a multi-trait model using summary statistic-based best linear unbiased predictors (SBLUP) of genetic correlates of DSM-IV diagnosis of ND in 6,394 individuals of European Ancestry (prevalence = 45.3%, %female = 46.8%, µage = 40.08 [s.d. = 10.43]) and 3,061 individuals from a nationally-representative sample with Fagerström Test for Nicotine Dependence symptom count (FTND; 51.32% female, mean age = 28.9 [s.d. = 1.70]). Polygenic predictors were derived from GWASs known to be phenotypically and genetically correlated with ND (i.e., Cigarettes per Day (CPD), the Alcohol Use Disorders Identification Test (AUDIT-Consumption and AUDIT-Problems), Neuroticism, Depression, Schizophrenia, Educational Attainment, Body Mass Index (BMI), and Self-Perceived Risk-Taking); including Height as a negative control. Analyses controlled for age, gender, study site, and the first 10 ancestral principal components. RESULTS The multi-trait model accounted for 3.6% of the total trait variance in DSM-IV ND. Educational Attainment (β=-0.125; 95% confidence interval (CI): [-0.149,-0.101]), CPD (0.071 [0.047,0.095]), and Self-Perceived Risk-Taking (0.051 [0.026,0.075]) were the most robust predictors. PGS effects on FTND were limited. CONCLUSIONS Risk for ND is not only polygenic, but also pleiotropic. Polygenic effects on ND that are accessible by these traits are limited in size and act additively to explain risk.
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Affiliation(s)
- Victoria A Risner
- Behavioral Genetics of Addiction Laboratory, Department of Psychology at Emory University, Atlanta GA
| | - Chelsie E Benca-Bachman
- Behavioral Genetics of Addiction Laboratory, Department of Psychology at Emory University, Atlanta GA
| | - Lauren Bertin
- Behavioral Genetics of Addiction Laboratory, Department of Psychology at Emory University, Atlanta GA
| | - Alicia K Smith
- Smith Lab, Department of Gynecology and Obstetrics, Emory University School of Medicine, Atlanta GA
| | - Jaakko Kaprio
- Institute for Molecular Medicine Finland, University of Helsinki, Helsinki Finland.,Department of Public Health, University of Helsinki, Helsinki Finland
| | - John E McGeary
- Department of Psychiatry & Human Behavior, Brown University, Providence RI.,The Genomic Laboratory, Providence VA Medical Center, Providence RI
| | | | - Valerie Knopik
- Department of Human Development and Family Studies, College of Health and Human Sciences, Purdue University, West Lafayette IN
| | - Naomi Friedman
- Department of Psychology, University of Colorado at Boulder, Boulder, CO
| | - Rohan H C Palmer
- Behavioral Genetics of Addiction Laboratory, Department of Psychology at Emory University, Atlanta GA
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Turco CV, Arsalan SO, Nelson AJ. The Influence of Recreational Substance Use in TMS Research. Brain Sci 2020; 10:E751. [PMID: 33080965 PMCID: PMC7603156 DOI: 10.3390/brainsci10100751] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 12/30/2022] Open
Abstract
(1) Background: Transcranial magnetic stimulation (TMS) approaches are widely used to study cortical and corticospinal function. However, responses to TMS are subject to significant intra-and inter-individual variability. Acute and chronic exposure to recreational substances alters the excitability of the sensorimotor system and may contribute to the variability in TMS outcome measures. The increasing prevalence of recreational substance use poses a significant challenge for executing TMS studies, but there is a lack of clarity regarding the influence of these substances on sensorimotor function. (2) Methods: The literature investigating the influence of alcohol, nicotine, caffeine and cannabis on TMS outcome measures of corticospinal, intracortical and interhemispheric excitability was reviewed. (3) Results: Both acute and chronic use of recreational substances modulates TMS measures of excitability. Despite the abundance of research in this field, we identify knowledge gaps that should be addressed in future studies to better understand the influence of these substances on TMS outcomes. (4) Conclusions: This review highlights the need for TMS studies to take into consideration the history of participant substance use and to control for acute substance use prior to testing.
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Affiliation(s)
| | | | - Aimee J. Nelson
- Department of Kinesiology, McMaster University, Hamilton, ON L8S 4L8, Canada; (C.V.T.); (S.O.A.)
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Bhatnagar A, Whitsel LP, Blaha MJ, Huffman MD, Krishan-Sarin S, Maa J, Rigotti N, Robertson RM, Warner JJ. New and Emerging Tobacco Products and the Nicotine Endgame: The Role of Robust Regulation and Comprehensive Tobacco Control and Prevention: A Presidential Advisory From the American Heart Association. Circulation 2019; 139:e937-e958. [DOI: 10.1161/cir.0000000000000669] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The advent of new tobacco products such as electronic cigarettes and the dramatic rise in their use, especially by adolescents and young adults, are significant public health concerns. Electronic cigarettes have become the most popular tobacco products for youth and adolescents in the United States and are attracting youth to new avenues for nicotine addiction. Although these products may have benefit by helping some smokers quit or to move to a less harmful product, the long-term health effects of these products and the net public health effect associated with their use remain unclear and widely debated. There is increasing concern that the use of newer tobacco products may catalyze transition to the use of other tobacco products or recreational drugs, particularly in young adults. Therefore, there is urgent need for robust US Food and Drug Administration regulation of all tobacco products to avoid the significant economic and population health consequences of continued tobacco use. Although the American Heart Association acknowledges that the ultimate endgame would be an end to all tobacco and nicotine addiction in the United States, it supports first minimizing the use of all combustible tobacco products while ensuring that other products do not addict the next generation of youth and adolescents. The endgame strategy needs to be coordinated with the long-standing, evidence-based tobacco control strategies that have significantly reduced tobacco use and initiation in the United States.
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Zhang TX, Saccone NL, Bierut LJ, Rice JP. Targeted sequencing identifies genetic polymorphisms of flavin-containing monooxygenase genes contributing to susceptibility of nicotine dependence in European American and African American. Brain Behav 2017; 7:e00651. [PMID: 28413702 PMCID: PMC5390834 DOI: 10.1002/brb3.651] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 11/27/2016] [Accepted: 12/22/2016] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Smoking is a leading cause of preventable death. Early studies based on samples of twins have linked the lifetime smoking practices to genetic predisposition. The flavin-containing monooxygenase (FMO) protein family consists of a group of enzymes that metabolize drugs and xenobiotics. Both FMO1 and FMO3 were potentially susceptible genes for nicotine metabolism process. METHODS In this study, we investigated the potential of FMO genes to confer risk of nicotine dependence via deep targeted sequencing in 2,820 study subjects comprising 1,583 nicotine dependents and 1,237 controls from European American and African American. Specifically, we focused on the two genomic segments including FMO1,FMO3, and pseudo gene FMO6P, and aimed to investigate the potential association between FMO genes and nicotine dependence. Both common and low-frequency/rare variants were analyzed using different algorithms. The potential functional significance of SNPs with association signal was investigated with relevant bioinformatics tools. RESULTS We identified different clusters of significant common variants in European (with most significant SNP rs6674596, p = .0004, OR = 0.67, MAF_EA = 0.14, FMO1) and African Americans (with the most significant SNP rs6608453, p = .001, OR = 0.64, MAF_AA = 0.1, FMO6P). No significant signals were identified through haplotype-based analyses. Gene network investigation indicated that both FMO1 and FMO3 have a strong relation with a variety of genes belonging to CYP gene families (with combined score greater than 0.9). Most of the significant variants identified were SNPs located within intron regions or with unknown functional significance, indicating a need for future work to understand the underlying functional significance of these signals. CONCLUSIONS Our findings indicated significant association between FMO genes and nicotine dependence. Replications of our findings in other ethnic groups were needed in the future. Most of the significant variants identified were SNPs located within intronic regions or with unknown functional significance, indicating a need for future work to understand the underlying functional significance of these signals.
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Affiliation(s)
- Tian-Xiao Zhang
- Department of Psychiatry Washington University School of Medicine St. Louis MO USA
| | - Nancy L Saccone
- Department of Genetics Washington University School of Medicine St. Louis MO USA
| | - Laura J Bierut
- Department of Psychiatry Washington University School of Medicine St. Louis MO USA
| | - John P Rice
- Department of Psychiatry Washington University School of Medicine St. Louis MO USA
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Otto JM, Gizer IR, Bizon C, Wilhelmsen KC, Ehlers CL. Polygenic risk scores for cigarettes smoked per day do not generalize to a Native American population. Drug Alcohol Depend 2016; 167:95-102. [PMID: 27530288 PMCID: PMC5037040 DOI: 10.1016/j.drugalcdep.2016.07.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 07/19/2016] [Accepted: 07/29/2016] [Indexed: 11/18/2022]
Abstract
BACKGROUND Recent studies have demonstrated the utility of polygenic risk scores (PRSs) for exploring the genetic etiology of psychiatric phenotypes and the genetic correlations between them. To date, these studies have been conducted almost exclusively using participants of European ancestry, and thus, there is a need for similar studies conducted in other ancestral populations. However, given that the predictive ability of PRSs are sensitive to differences in linkage disequilibrium (LD) patterns and minor allele frequencies across discovery and target samples, the applicability of PRSs developed in European ancestry samples to other ancestral populations has yet to be determined. Therefore, the current study derived PRSs for cigarettes per day (CPD) from predominantly European-ancestry samples and examined their ability to predict nicotine dependence (ND) in a Native American (NA) population sample. METHOD Results from the Tobacco and Genetics Consortium's meta-analysis of genome-wide association studies of CPD were used to compute PRSs in a NA community sample (N=288). These scores were then used to predict ND diagnostic status. RESULTS The PRS was not significantly associated with liability for ND in the full sample. However, a significant interaction between PRS and percent NA ancestry was observed. Risk scores were positively associated with liability for ND at higher levels of European ancestry, but no association was observed at higher levels of NA ancestry. CONCLUSION These findings illustrate how differences in patterns of LD across discovery and target samples can reduce the predictive ability of PRSs for complex traits.
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Affiliation(s)
- Jacqueline M Otto
- Department of Psychological Sciences, University of Missouri, 210 McAlester Hall, Columbia, MO 65211, United States
| | - Ian R Gizer
- Department of Psychological Sciences, University of Missouri, 210 McAlester Hall, Columbia, MO 65211, United States
| | - Chris Bizon
- Renaissance Computing Institute (RENCI), 100 Europa Drive, Suite 540, Chapel Hill, NC 27517, United States
| | - Kirk C Wilhelmsen
- Renaissance Computing Institute (RENCI), 100 Europa Drive, Suite 540, Chapel Hill, NC 27517, United States; Departments of Genetics and Neurology, University of North Carolina at Chapel Hill, 120 Mason Farm Road, 5093 Genetic Medicine Building, CB#7264, Chapel Hill, NC 27599, United States
| | - Cindy L Ehlers
- Department of Molecular and Cellular Neurosciences, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States.
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Obasi EM, Cavanagh L, Pittman DM, Brooks JJ. Effects of Evaluative Context in Implicit Cognitions Associated with Alcohol and Violent Behaviors. Addict Behav Rep 2016; 3:48-55. [PMID: 27175442 PMCID: PMC4860736 DOI: 10.1016/j.abrep.2016.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Introduction A large body of literature has substantiated the relationship between alcohol use and violent behaviors, but little consideration has been given to implicit interactions between the two. This study examines the implicit attitudes associated with alcoholic drinks and violent behaviors, and their relationship to explicit reports of problematic behaviors associated with alcohol use. Methods The Go/No-Go Association Task (GNAT; Nosek & Banaji, 2001) was used to test the effect of distracters (noise) on implicit cognitions associated with alcoholic drinks and violent behaviors. Data was collected from 148 students enrolled in a Midwestern university. Results Irrespective of contextual distractions, participants consistently exhibited negative implicit cognitions associated with violent behaviors. However, context impacted the valence of cognitions associated with alcoholic beverages. Implicit cognitions associated with alcoholic beverages were negative when nonalcoholic beverages were used as distracters, but were positive when licit and illicit drugs were used as distracters. Implicit cognitions associated with alcoholic drinks were correlated with implicit cognitions associated with violent behaviors and explicit measures of problem drinking, problem drug-related behaviors, and measures of craving, to name a few. Conclusion Evaluative context can have an effect on the expressed appraisal of implicit attitudes. Implications, limitations, and future directions for using the GNAT in addictions research are discussed. Implicit cognitions associated with violent behaviors were always negative. Implicit cognitions of alcohol were negative when drinks were used as distracters. Implicit cognitions of alcohol were positive when drugs were used as distracters. Evaluative context had an effect on the expressed appraisal of implicit attitudes.
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Bidwell LC, McGeary JE, Gray JC, Palmer RHC, Knopik VS, MacKillop J. An initial investigation of associations between dopamine-linked genetic variation and smoking motives in African Americans. Pharmacol Biochem Behav 2015; 138:104-10. [PMID: 26410615 DOI: 10.1016/j.pbb.2015.09.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 08/05/2015] [Accepted: 09/24/2015] [Indexed: 11/25/2022]
Abstract
Nicotine dependence (ND) is a heterogeneous phenotype with complex genetic influences that may vary across ethnicities. The use of intermediate phenotypes may clarify genetic influences and reveal specific etiological pathways. Prior work in European Americans has found that the four Primary Dependence Motives (PDM) subscales (Automaticity, Craving, Loss of Control, and Tolerance) of the Wisconsin Inventory of Smoking Motives represent core features of nicotine dependence and are promising intermediate phenotypes for understanding genetic pathways to ND. However, no studies have examined PDM as an intermediate phenotype in African American smokers, an ethnic population that displays unique patterns of smoking and genetic variation. In the current study, 268 African American daily smokers completed a phenotypic assessment and provided a sample of DNA. Associations among haplotypes in the NCAM1-TTC12-ANKK1-DRD2 gene cluster, a dopamine-related gene region associated with ND, PDM intermediate phenotypes, and ND were examined. Dopamine-related genetic variation in the DBH and COMT genes was also considered on an exploratory basis. Mediational analysis was used to test the indirect pathway from genetic variation to smoking motives to nicotine dependence. NCAM1-TTC12-ANKK1-DRD2 region variation was significantly associated with the Automaticity subscale and, further, Automaticity significantly mediated associations among NCAM1-TTC12-ANKK1-DRD2 cluster variants and ND. DBH was also significantly associated with Automaticity, Craving, and Tolerance; Automaticity and Tolerance also served as mediators of the DBH-ND relationship. These results suggest that PDM, Automaticity in particular, may be a viable intermediate phenotype for understanding dopamine-related genetic influences on ND in African American smokers. Findings support a model in which putatively dopaminergic variants exert influence on ND through an effect on patterns of automatic routinized smoking.
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Affiliation(s)
- L C Bidwell
- Institute of Cognitive Science, University of Colorado at Boulder, Boulder, CO 80304, United States; Division of Behavioral Genetics, Rhode Island Hospital, 1 Hoppin St., Providence, RI 02903, United States; Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI 02903, United States.
| | - J E McGeary
- Providence Veterans Affairs Medical Center, 830 Chalkstone Avenue, Building 35, Providence, RI 02908, United States; Division of Behavioral Genetics, Rhode Island Hospital, 1 Hoppin St., Providence, RI 02903, United States; Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI 02903, United States
| | - J C Gray
- Department of Psychology, 100 Hooper St., University of Georgia, Athens, GA 30602, United States
| | - R H C Palmer
- Division of Behavioral Genetics, Rhode Island Hospital, 1 Hoppin St., Providence, RI 02903, United States; Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI 02903, United States
| | - V S Knopik
- Division of Behavioral Genetics, Rhode Island Hospital, 1 Hoppin St., Providence, RI 02903, United States; Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI 02903, United States
| | - J MacKillop
- Peter Boris Centre for Addictions Research, McMaster University/St. Joseph's Healthcare Hamilton, 100 West 5th At., Hamilton, ON L8N 3K7, Canada
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15
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Bidwell LC, McGeary JE, Gray JC, Palmer RHC, Knopik VS, MacKillop J. NCAM1-TTC12-ANKK1-DRD2 variants and smoking motives as intermediate phenotypes for nicotine dependence. Psychopharmacology (Berl) 2015; 232:1177-86. [PMID: 25273375 PMCID: PMC4361268 DOI: 10.1007/s00213-014-3748-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 09/18/2014] [Indexed: 10/24/2022]
Abstract
RATIONALE Nicotine dependence (ND) is a heterogeneous phenotype with complex genetic influences. The use of intermediate ND phenotypes may clarify genetic influences and reveal specific etiological pathways. Prior work has found that the four Primary Dependence Motives (PDM) subscales (Automaticity, Craving, Loss of Control, and Tolerance) of the Wisconsin Inventory of Smoking Motives (WISDM) represent heavy, pervasive smoking, which is a core feature of nicotine dependence, making these motives strong candidates as intermediate phenotypes. OBJECTIVE This study examines the WISDM PDM as a novel intermediate phenotype of nicotine dependence. METHODS The study used data from 734 European Americans who smoked at least 5 cigs/day [M = 16.2 (SD = 9.5) cigs/day], completed a phenotypic assessment, and provided a sample of DNA. Based on prior evidence of the role of genetic variation in the NCAM1-TTC12-ANKK1-DRD2 region on chromosome 11q23 in smoking behavior, associations among 12 region loci with nicotine dependence and PDM phenotypes were examined using haplotype and individual loci approaches. In addition, mediational analysis tested the indirect pathway from genetic variation to smoking motives to nicotine dependence. RESULTS NCAM1-TTC12-ANKK1-DRD2 region loci and haplotypes were significantly associated with the motive of Automaticity and, further, Automaticity significantly mediated associations among NCAM1-TTC12-ANKK1-DRD2 cluster variants and nicotine dependence. CONCLUSIONS These results suggest that motives related to automaticity are a viable intermediate phenotype for understanding genetic contributions to nicotine dependence. Further, NCAM1-TTC12-ANKK1-DRD2 variants may increase the likelihood that a person will become dependent via a highly automatic smoking ritual that can be elicited with little awareness.
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Affiliation(s)
- L C Bidwell
- Center for Alcohol and Addition Studies, Department of Behavioral and Social Sciences, Brown University, Box G-S121-4, Providence, RI, 02912, USA,
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Bickel WK, Johnson MW, Koffarnus MN, MacKillop J, Murphy JG. The behavioral economics of substance use disorders: reinforcement pathologies and their repair. Annu Rev Clin Psychol 2014; 10:641-77. [PMID: 24679180 DOI: 10.1146/annurev-clinpsy-032813-153724] [Citation(s) in RCA: 426] [Impact Index Per Article: 38.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The field of behavioral economics has made important inroads into the understanding of substance use disorders through the concept of reinforcer pathology. Reinforcer pathology refers to the joint effects of (a) the persistently high valuation of a reinforcer, broadly defined to include tangible commodities and experiences, and/or (b) the excessive preference for the immediate acquisition or consumption of a commodity despite long-term negative outcomes. From this perspective, reinforcer pathology results from the recursive interactions of endogenous person-level variables and exogenous environment-level factors. The current review describes the basic principles of behavioral economics that are central to reinforcer pathology, the processes that engender reinforcer pathology, and the approaches and procedures that can repair reinforcement pathologies. The overall goal of this review is to present a new understanding of substance use disorders as viewed by recent advances in behavioral economics.
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Affiliation(s)
- Warren K Bickel
- Virginia Tech Carilion Research Institute, Roanoke, Virginia 24016; ,
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