CNTNAP2 and attention deficit-hyperactivity disorder: For example, CNTNAP2 has been highlighted in studies of autism spectrum disorder (ASD) [Alarcon et al., 2008] and attention deficit/hyperactivity disorder (ADHD) [Elia et al., 2009], and rare variants in CNTNAP2 were found in children with childhood apraxia of speech [Worthey et al., 2013]; CMIP has been implicated in ASD [Van der Aa et al., 2012]; ATP2C2 has been implicated in ADHD [Lesch et al., 2008].