Additionally, several studies showed that the VIPR2 gene is associated with other psychiatric disorders, such as higher frequencies of CNVs in autism spectrum disorder (Firouzabadi et al., 2017), hypomethylation at CpG sites in attention deficit and hyperactivity disorder (ADHD; Wilmot et al., 2016) and different frequencies of SNP (rs885861) between patients with mood disorders (MD) and controls (Soria et al., 2010). Here, VIPR2 is linked to attention deficit-hyperactivity disorder.