a1 US National Institute of Mental Health
a2 Kings College London
a3 Goldsmiths College, London
Consistent evidence shows both genetic and stress-related risks on child and adolescent anxiety, yet few studies have considered the degree to which genetic effects are moderated by stress (gene–environment interaction). We used longitudinal data from both a child and adolescent sample of twins to examine three novel issues on the presence of gene–environment interaction on anxiety symptoms. First, we assessed moderation of genetic risks on anxiety symptoms by negative life events in each age group. Second, by distinguishing between “stable” and “age-specific” genetic factors, we explored the continuity of gene–environment interaction across time and/or its emergence at specific ages. Third, we compared the presence of gene–environment interaction across different symptom types (general, panic, social, and separation). Genetic effects on separation anxiety symptoms in childhood (mean age = 8 years, 6 months) and panic anxiety symptoms in adolescence (mean age = 15 years) increased across independent negative life events. Shared environmental effects on separation anxiety symptoms and nonshared environmental effects on general anxiety symptoms in adolescence were also moderated by negative life events. We interpret these preliminary findings tentatively in the context of gene–environment interaction on anxiety in general, and on early separation and later panic anxiety in particular.
We thank all participants from the G1219 and ECHO studies. We are also grateful to Jeanette Augustin, Pippa Carter, Sally Cartwright, David Clark, Georgina Hosang, Alessandra Iervolino, Orla Jordan, Holan Liang, Helen Mathews, Barbara Maughan, Fiona McCleod, Peter McGuffin, Maria Napolitano, Robert Plomin, Frühling Rijsdijk, Richard Rowe, Pak Sham, Nina Shiffrin, Jasmine Singh, Abram Sterne, Lucy Stirling, Eileen Walsh, and Richard Williamson for their assistance on various aspects of the study. This research was supported by the W. T. Grant Foundation, the University of London Central Research Fund, and two Medical Research Council fellowships to the last author. The first author was supported by the Intramural Research Program of the National Institute of Mental Health, National Institutes of Health.