FOXP2 and attention deficit-hyperactivity disorder: More recently, Mascheretti et al.111 found significant main and interactive associations upon hyperactivity/impulsivity involving DCDC2 and KIAA0319, while Sánchez-Móran et al.25 reported stronger associations of candidate KIAA0319 and FOXP2 variants with ADHD–DD comorbid cases, compared with simple dyslexic subjects.