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Age at first use and later substance use disorder: Shared genetic and environmental pathways for nicotine, alcohol, and cannabis.

ABSTRACT: Behavioral genetic studies have provided insights into why early substance use initiation is associated with increased risk for disorder. Few genetically informative studies, however, have operationalized initiation as the timing of first use and simultaneously modeled the timing of initiation and problematic use of multiple substances. Such research can help capture the risk associated with early initiation and determine the extent to which genetic and environmental risk generalizes across substances. This study utilized a behavior genetic approach to examine the relation between the age of substance use initiation and symptoms of substance use disorder. Participants were 7,285 monozygotic and dizygotic twins (40% male, mean age at interview = 30.6 years) from the Australian Twin Registry who reported on their ages of tobacco, alcohol, and cannabis initiation and symptoms of Diagnostic and Statistical Manual of Mental Disorders (4th ed., DSM-IV) nicotine dependence, alcohol use disorder, and cannabis use disorder. Biometric modeling was conducted to (a) determine the structure of genetic and environmental influences on initiation and disorder and (b) examine their genetic and environmental overlap. The latent structure of initiation differed across men and women. The familial covariance between initiation and disorder was genetic among men and genetic and environmental among women, suggesting that the relation between first substance use and disorder is partly explained by a shared liability. After accounting for familial overlap, significant unique environmental correlations were observed, indicating that the age of initiation of multiple drugs may directly increase risk for substance-related problems. Results support the utility of conceptualizing initiation in terms of age and of adopting a multivariate approach. (PsycINFO Database Record

SUBMITTER: Richmond-Rakerd LS

PROVIDER: S-EPMC5061603 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Age at first use and later substance use disorder: Shared genetic and environmental pathways for nicotine, alcohol, and cannabis.

Richmond-Rakerd Leah S LS Slutske Wendy S WS Lynskey Michael T MT Agrawal Arpana A Madden Pamela A F PA Bucholz Kathleen K KK Heath Andrew C AC Statham Dixie J DJ Martin Nicholas G NG

Journal of abnormal psychology 20160818 7

Behavioral genetic studies have provided insights into why early substance use initiation is associated with increased risk for disorder. Few genetically informative studies, however, have operationalized initiation as the timing of first use and simultaneously modeled the timing of initiation and problematic use of multiple substances. Such research can help capture the risk associated with early initiation and determine the extent to which genetic and environmental risk generalizes across subs ...[more]

PMID: 27537477

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Project description:ImportanceSubstance use disorders are a major source of morbidity and mortality in the United States. National data comparing the prevalence of substance use disorder diagnoses (SUDDs) among transgender and cisgender individuals are lacking in the United States.ObjectivesTo investigate the prevalence of SUDDs among transgender and cisgender adults and to identify within-group and between-group differences by age, gender, and geographic location.Design, setting, and participantsThis cross-sectional study used the OptumLabs Data Warehouse to analyze deidentified claims from approximately 74 million adults aged 18 years or older enrolled in commercial or Medicare Advantage insurance plans in 2017. A total of 15 637 transgender adults were identified based on a previously developed algorithm using a combination of International Classification of Diseases, Tenth Revision (ICD-10) transgender-related diagnosis and procedure codes and sex-discordant hormone prescriptions. A cohort of 46 911 cisgender adults was matched to the transgender cohort in a 3:1 ratio based on age and geographic location.Main outcomes and measuresSUDDs, based on ICD-10 codes, were assessed overall and compared between transgender and cisgender cohorts and by geographic region (ie, Northeast, Midwest, South, and West); age groups (eg, 18-25, 26-30, 31-35 years), and gender (ie, transfeminine [TF; assigned male sex at birth, identify along feminine gender spectrum], transmasculine [TM; assigned female sex at birth, identify along masculine gender spectrum], male, and female).ResultsIn this study of 15 637 transgender adults (4955 [31.7%] TM) and 46 911 cisgender adults (23 247 [50.4%] men), most (8627 transgender adults [55.2%]; 51 762 cisgender adults [55.2%]) were aged between 18 and 40 years, and 6482 transgender adults (41.5%) and 19 446 cisgender adults (41.5%) lived in the South. Comparing transgender to cisgender groups, significant differences were found in the prevalence of a nicotine (2594 [16.6%] vs 2551 [5.4%]; P < .001), alcohol (401 [2.6%] vs 438 [0.9%]; P < .001), and drug (678 [4.3%] vs 549 [1.2%]; P < .001) SUDDs. Among transgender adults, cannabis was the most prevalent drug SUDD (321 [2.1%]), followed by opioid SUDD (205 [1.3%]) and cocaine SUDD (81 [0.5%]), whereas among cisgender adults, cannabis and opioid SUDDs were equally prevalent (cannabis, 186 [0.4%]; opioid, 207 [0.4%]), followed by cocaine SUDD (59 [0.1%]).Conclusions and relevanceIn this study, the prevalence of SUDDs was significantly elevated among transgender adults relative to their cisgender peers. These findings underscore the need for culturally tailored clinical interventions to treat substance use disorder in transgender populations.

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Age at first use and later substance use disorder: Shared genetic and environmental pathways for nicotine, alcohol, and cannabis.

Publications

Age at first use and later substance use disorder: Shared genetic and environmental pathways for nicotine, alcohol, and cannabis.

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