http://rt.com/news/238817-autism-twins-uk-study/

Scientists at King’s College London have collected evidence from a population-based sample revealing that genetic factors outweigh more moderate environmental influences regards risk of autism and related traits in personality. They published their results online this week in JAMA Psychiatry.

Over 6,000 twins, born in England and Wales between 1994 and 1996, with a variety of autism-related traits – high and low subclinical levels, as well as ASD, – participated in several evaluations: the Childhood Autism Spectrum Test (6,423 twins), the Development and Well-being Assessment (359), the Autism Diagnostic Observation Schedule (203), the Autism Diagnostic Interview-Revised (205), and a best-estimate diagnosis (207) – and all of them showed consistency in their results. […]

“Our main finding was that the heritability of ASD was high. These results further demonstrate the importance of genetic effects on ASD, despite the dramatic increase in prevalence of the disorder over the last 20 years,” said lead author Beata Tick in a statement.

“They also confirm that genetic factors lead to a variety of autistic skills and behaviors across the general population,” Tick added. […]

Our findings add weight to the view that ASD represents the extreme manifestation of autistic skills and behaviors seen in the general population,” Bolton added.

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