Abstract:
BACKGROUND:Previously reported comorbidity between schizophrenia and substance use may be explained by shared underlying risk factors, such as genetic background. The aim of the present longitudinal study was to investigate how a genetic predisposition to schizophrenia was associated with patterns of substance use (cannabis use, smoking, alcohol use) during adolescence (comparing ages 13-16 with 16-20 years). METHOD:Using piecewise latent growth curve modelling in a longitudinal adolescent cohort (RADAR-Y study, N = 372), we analyzed the association of polygenic risk scores for schizophrenia (PRS; p-value thresholds (pt) < 5e-8 to pt < 0.5) with increase in substance use over the years, including stratified analyses for gender. Significance thresholds were set to adjust for multiple testing using Bonferroni at p ≤ 0.001. RESULTS:High schizophrenia vulnerability was associated with a stronger increase in cannabis use at age 16-20 (PRS thresholds pt < 5e-5 and pt < 5e-4; pt < 5e-6 was marginally significant), whereas more lenient PRS thresholds (PRS thresholds pt < 5e-3 to pt < 0.5) showed the reverse association. For smoking and alcohol, no clear relations were found. CONCLUSIONS:In conclusion, our findings support a relation between genetic risk to schizophrenia and prospective cannabis use patterns during adolescence. In contrast, no relation between alcohol and smoking was established.
journal_name
Drug Alcohol Dependjournal_title
Drug and alcohol dependenceauthors
Hiemstra M,Nelemans SA,Branje S,van Eijk KR,Hottenga JJ,Vinkers CH,van Lier P,Meeus W,Boks MPdoi
10.1016/j.drugalcdep.2018.05.024subject
Has Abstractpub_date
2018-09-01 00:00:00pages
143-150eissn
0376-8716issn
1879-0046pii
S0376-8716(18)30339-9journal_volume
190pub_type
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journal_title:Drug and alcohol dependence
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