Genetic and shared couple environmental contributions to smoking and alcohol use in the UK population

Alcohol use and smoking are leading causes of death and disability worldwide. Both genetic and environmental factors have been shown to influence individual differences in the use of these substances. In the present study we tested whether genetic factors, modelled alongside common family environmen...

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Veröffentlicht in:Molecular psychiatry 2021-08, Vol.26 (8), p.4344-4354
Hauptverfasser: Clarke, Toni-Kim, Adams, Mark J., Howard, David M., Xia, Charley, Davies, Gail, Hayward, Caroline, Campbell, Archie, Padmanabhan, Sandosh, Smith, Blair H., Murray, Alison, Porteous, David, Deary, Ian J., McIntosh, Andrew M.
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container_end_page 4354
container_issue 8
container_start_page 4344
container_title Molecular psychiatry
container_volume 26
creator Clarke, Toni-Kim
Adams, Mark J.
Howard, David M.
Xia, Charley
Davies, Gail
Hayward, Caroline
Campbell, Archie
Padmanabhan, Sandosh
Smith, Blair H.
Murray, Alison
Porteous, David
Deary, Ian J.
McIntosh, Andrew M.
description Alcohol use and smoking are leading causes of death and disability worldwide. Both genetic and environmental factors have been shown to influence individual differences in the use of these substances. In the present study we tested whether genetic factors, modelled alongside common family environment, explained phenotypic variance in alcohol use and smoking behaviour in the Generation Scotland (GS) family sample of up to 19,377 individuals. SNP and pedigree-associated effects combined explained between 18 and 41% of the variance in substance use. Shared couple effects explained a significant amount of variance across all substance use traits, particularly alcohol intake, for which 38% of the phenotypic variance was explained. We tested whether the within-couple substance use associations were due to assortative mating by testing the association between partner polygenic risk scores in 34,987 couple pairs from the UK Biobank (UKB). No significant association between partner polygenic risk scores were observed. Associations between an individual's alcohol PRS ( b  = 0.05, S.E. = 0.006, p  
doi_str_mv 10.1038/s41380-019-0607-x
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Both genetic and environmental factors have been shown to influence individual differences in the use of these substances. In the present study we tested whether genetic factors, modelled alongside common family environment, explained phenotypic variance in alcohol use and smoking behaviour in the Generation Scotland (GS) family sample of up to 19,377 individuals. SNP and pedigree-associated effects combined explained between 18 and 41% of the variance in substance use. Shared couple effects explained a significant amount of variance across all substance use traits, particularly alcohol intake, for which 38% of the phenotypic variance was explained. We tested whether the within-couple substance use associations were due to assortative mating by testing the association between partner polygenic risk scores in 34,987 couple pairs from the UK Biobank (UKB). No significant association between partner polygenic risk scores were observed. Associations between an individual's alcohol PRS ( b  = 0.05, S.E. = 0.006, p  &lt; 2 × 10 −16 ) and smoking status PRS ( b  = 0.05, S.E. = 0.005, p  &lt; 2 × 10 −16 ) were found with their partner’s phenotype. In support of this, G carriers of a functional ADH1B polymorphism (rs1229984), known to be associated with greater alcohol intake, were found to consume less alcohol if they had a partner who carried an A allele at this SNP. Together these results show that the shared couple environment contributes significantly to patterns of substance use. It is unclear whether this is due to shared environmental factors, assortative mating, or indirect genetic effects. 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subjects 45/43
631/208
692/699/476/5
Alcohol dehydrogenase
Alcohol Dehydrogenase - genetics
Alcohol Drinking - genetics
Alcohol use
Assortative mating
Behavior
Behavioral Sciences
Biological Psychology
Couples
Drinking of alcoholic beverages
Drug use
Environmental factors
Family
Genetic aspects
Genetic factors
Humans
Medicine
Medicine & Public Health
Neurosciences
Pedigree
Pharmacotherapy
Phenotypes
Phenotypic variations
Polygenic inheritance
Psychiatry
Scotland
Single-nucleotide polymorphism
Smoking
Smoking - genetics
Social aspects
Substance use
Tobacco Smoking
title Genetic and shared couple environmental contributions to smoking and alcohol use in the UK population
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