The number of studies devoted to understanding how genetic and environmental influences operate together has increased drastically over the past decade plus. When I defended my graduate dissertation on gene-environment interaction sixteen years ago, my committee gave me some good-natured chiding about choosing a topic with so little research literature to review (and no, for the younger generation of students, they were not being facetious). With PubMed now returning >10,000 records for gene-environment interaction, there is no longer a paucity of research in this area! The study of genetic influences on human behavior has become mainstream, and the analysis of genetic information is now routinely included in many developmental studies, and, more recently, in prevention studies.
