Multiple studies have shown that different SNAP-25 SNPs are associated with related traits of autism (Guerini et al., 2011) and ADHD (Forero et al., 2009; Braida et al., 2015), as well as with working memory ability (Söderqvist et al., 2010; Gao et al., 2015), short-/long-term memory and visual attention (Golimbet et al., 2010), and intellectual disability (Rizzi et al., 2012), These observations can be explained by the fact that the markers studied here are located close to a locus linked with behavioral and cognitive functions. This evidence concerns the gene SNAP25 and attention deficit-hyperactivity disorder.