In Brief: The genetics of autism
The genetics of autism
The three main features of autism are impaired capacity for social interaction, impaired speech, and restricted, repetitive behavior and interests. A study by British researchers suggests that these characteristics are inherited separately, and autism must be broken down into its components for purposes of genetic research.
The parents of nearly 7,000 eight-year-old twins (about 2,300 fraternal and 1,100 identical pairs) answered a questionnaire called the Childhood Asperger Syndrome Test, which identifies symptoms along the autistic spectrum from severe autism to Asperger's syndrome. The 2% of children who scored highest for autistic symptoms were described as "at risk of autistic spectrum disorder." As expected, the vast majority (77%) were boys.