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Autism is caused by genetic make-up in 74-98% of cases, a Medical Research Council study of 516 twins indicates.
The King's College London team said 181 of the teenagers had autism, but the rate was far higher in the identical twins, who share the same DNA.
The researchers told JAMA Psychiatry tens if not hundreds of genes were involved, and they do not rule out environmental factors entirely.
Both twins in each pair had been raised by their parents in the same household.
http://www.bbc.co.uk/news/health-31713147
The King's College London team said 181 of the teenagers had autism, but the rate was far higher in the identical twins, who share the same DNA.
The researchers told JAMA Psychiatry tens if not hundreds of genes were involved, and they do not rule out environmental factors entirely.
Both twins in each pair had been raised by their parents in the same household.
http://www.bbc.co.uk/news/health-31713147