The Influence of Spousal Genotype on Alcohol Problems in Marriage

Authors:
Open Access
Publisher website
Google Scholar
Abstract
Background: The field's conventional understanding of how genetic factors impact risk for alcohol use disorder (AUD) typically focuses on direct genetic effects, or how an individual's own genetic predispositions are associated with the likelihood of experiencing clinically significant alcohol problems. More recently, studies of behavioral health outcomes in preclinical and human studies have demonstrated the potential importance of social genetic effects or the influence of a social partner's genotype on substance use and related outcomes. In this study, we sought to characterize social genetic effects for AUD, specifically in the context of marriage. Methods: The sample included 660 opposite‐sex spousal dyads from the Collaborative Study on the Genetics of Alcoholism, restricted to individuals who were genetically similar to European reference panels. Measured and latent indicators of genetic risk included polygenic scores of problematic alcohol use (PGS PAU ) and parental history of AUD (PH AUD ), respectively. The outcome was Diaganostic and Statistical Manual (DSM)‐5 alcohol use disorder criterion count (AUDcrit) during marriage. Multilevel models accounted for the non‐independence of partners' data, including correlations between partners' genetic risk and residual covariance in AUDcrit. Results: After accounting for direct genetic effects (i.e., the influence of one's own genetic predispositions) and the correlations between partners' genetic predispositions, we found that having a spouse with higher PGS PAU was associated with higher AUDcrit (B = 0.084, 95% CI [0.035, 0.132]). This social genetic effect was robust after adjusting for both partners' educational attainment. Spousal PH AUD was not associated with AUDcrit. Exploratory analyses indicated that the social genetic effect of spousal PGS PAU was stronger among male target individuals. Conclusions: Findings highlight the potential importance of social genetic effects for understanding the pathways from genotype to alcohol use disorder and the need for further investigation of latent measures of genetic predispositions in studies of social genetic effects.
Funding Information
  • National Institute on Alcohol Abuse and Alcoholism (R01AA030996)
  • National Institute on Alcohol Abuse and Alcoholism (U10AA008401)

This publication has 53 references indexed in Scilit: