News Life Rare gene variants linked to ADHD Missing or added genes also cause other brain disorders Share this:FacebookTwitterPocketRedditPrintEmail By Tina Hesman Saey August 10, 2011 at 3:44 pm This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe