BDNF and major depressive disorder: A first hint for a crucial role of distinct BDNF transcripts in control of cortical inhibition, aggressive behavior (Lyons and West, 2011; Hill et al., 2016; Maynard et al., 2016), or e.g., in the induction of depression was obtained in BDNF mouse models in which one of its promoters had been impaired (Hong et al., 2008; Sakata et al., 2009).