How many genes are involved in causing autistic disorder?
• Autistic disorder is a complex genetic disorder. Genetic studies suggest that autistic disorder is caused by a combination of genetic and environmental factors. Genetic models predict that in any given individual with idiopathic autistic disorder, between 2 and 15 genes may be interacting with each other or environmental factors to cause autistic disorder. There may be as many as 30 different genes that contribute to autistic disorder in different individuals.