The Attention-Deficit/Hyperactivity Disorder-Associated DRD4 7R Allele Predicts Household Economic Status but Not Nutritional Status in Northern Kenyan Rendille Children.

Abstract excerpt

OBJECTIVES: Around 11% of U.S. children are diagnosed with attention-deficit/hyperactivity disorder (ADHD). One hypothesis for ADHD's relatively high prevalence is that behaviors associated with ADHD were advantageous in past environments where they were positively selected for. A previous study showed that an allele associated with ADHD-the 7R allele of the gene encoding the D(4) dopamine receptor (DRD4)-had a...

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