Autism is almost entirely genetic in origin, new research has suggested, with between 74% and 98% of cases down to biological make-up.
A study conducted by the Medical Research Council looked at 516 twins, and found that rates of autism spectrum disorder were higher in identical twins who share the same DNA.
This means that the condition is far more heritable than previously thought.
The study, which appears in the journal JAMA Psychiatry, also found that genes were responsible for autistic traits and behaviors in the general population.
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