Gene-environment correlation: Difficulties and a natural experiment-based strategy

B. Wagner, J. Li, H. Liu and G. Guo

American Journal of Public Health, 2013, vol. 103, issue SUPPL.1, S167-S173

Abstract: Objectives. We explored how gene-environment correlations can result in endogenous models, how natural experiments can protect against this threat, and if unbiased estimates from natural experiments are generalizable to other contexts. Methods. We compared a natural experiment, the College Roommate Study, which measured genes and behaviors of college students and their randomly assigned roommates in a southern public university, with observational data from the National Longitudinal Study of Adolescent Health in 2008. We predicted exposure to exercising peers using genetic markers and estimated environmental effects on alcohol consumption. A mixed-linear model estimated an alcohol consumption variance that was attributable to genetic markers and across peer environments. Results. Peer exercise environment was associated with respondent genotype in observational data, but not in the natural experiment. The effects of peer drinking and presence of a general gene-environment interaction were similar between data sets. Conclusions. Natural experiments, like random roommate assignment, could protect against potential bias introduced by gene-environment correlations. When combined with representative observational data, unbiased and generalizable causal effects could be estimated.

Keywords: adolescent; article; biological model; comparative study; drinking behavior; exercise; female; genetics; genotype environment interaction; human; longitudinal study; male; medical research; methodology; observation; peer group; physiology; single nucleotide polymorphism; student; university, Adolescent; Alcohol Drinking; Biomedical Research; Exercise; Female; Gene-Environment Interaction; Humans; Longitudinal Studies; Male; Models, Biological; Observation; Peer Group; Polymorphism, Single Nucleotide; Research Design; Students; Universities (search for similar items in EconPapers)
Date: 2013
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:aph:ajpbhl:10.2105/ajph.2013.301415_4

DOI: 10.2105/AJPH.2013.301415

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