NGF and psychiatric disorder: GSK3B (Beaulieu, 2012), BDNF (Lu et al., 2014), NGF (Cirulli and Alleva, 2009), NRG1 (Mei and Nave, 2014), HTR2C (Chagraoui et al., 2016; Palacios et al., 2017), and PIP4K2A (Wilcox and Hinchliffe, 2008) are genes that showed some importance in the study of the molecular etiology of psychiatric disorders (Table 1).