The first direct evidence of a genetic link to attention-deficit hyperactivity disorder has been found, a study says.
Scientists from Cardiff University, writing in The Lancet, said the disorder was a brain problem like autism – not due to bad parenting.
Anita Thapa, professor of child and adolesence psychiatry at Cardiff, said the discovery was an exciting breakthrough.
The researchers compared genetic samples from ADHD children, with DNA from 1,047 people without the condition.
They found that 15% of the ADHD group had large and rare variations in their DNA – compared with 7% in the control group.