Using data from the general population-representative Avon Longitudinal Study of Parents and Children (ALSPAC) birth cohort, we previously reported a longitudinal association between serum IL-6 levels in childhood at age 9 years and risk of depression and psychosis subsequently in early adulthood at age 18 years (Khandaker et al., 2014). The gene discussed is IL6; the disease is depressive symptom measurement.