Autism risk is half genetic, half environmental: study
Published on May 4, 2014 7:57 PM
WASHINGTON (AFP) - A large study in Sweden has shown that genes are just as important as environmental factors in assessing the causes of autism.
Researchers were surprised to discover that the inheritability of the neurodevelopmental disorder was about 50 per cent - much lower than previous studies that put it at 80-90 per cent - and that it was equal to environmental causes, according to the study published in the Journal of the American Medical Association.
The findings were based on data from more than two million people in Sweden from 1982 to 2006, and is the largest to date on the topic of understanding whether genes or the environment contribute to autism, which affects about one in 100 children globally, and as many as one in 68 in the United States.
"We were surprised by our findings as we did not expect the importance of environmental factors in autism to be so strong," said study author Avi Reichenberg from the Mount Sinai Seaver Center for Autism Research in New York.
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