[Catechol-O-methyltransferase gene rs6267 polymorphism in children with attention deficit hyperactivity disorder].

Objective: To study the relationship between rs6267 polymorphism of catechol-O-methyltransferase (COMT) gene and attention deficit hyperactivity disorder (ADHD).

Methods: One hundred and fourteen children with ADHD and 76 normal volunteers were enrolled. Polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) techniques were used for detecting COMT rs6267 polymorphism.