A genetic variant called DRD4-7R is linked to ADHD. Rock stars are, too...DRD4-7R, found in an estimated twenty-percent of the population, has been called “the restless gene” or “the nomadic gene.” It is also frequently associated with Attention Deficit-Hyperactivity Disorder (ADHD), a condition much in the news of late due to an unprecedented increase in diagnoses in school-aged children.