For example, a Brazilian case–control study and a meta‐analysis both failed to find a significant relationship between GIT1 rs550818 and ADHD (Klein et al., 2015; Salatino‐Oliveira et al., 2012); however, these discrepancies may be due, at least in part, to differences in the genetic backgrounds of the participants. Here, GIT1 is linked to attention deficit-hyperactivity disorder.