However, study author Sven Sandin cautioned that “our results do not give any information about specific genes or other direct causes. It only informs us that genes are important.”
Sandin, an assistant professor of psychiatry at the Icahn School of Medicine at Mount Sinai in New York City, noted that the findings also don’t reflect anything about the reported increases in autism rates in recent years.
“We already know that autism has very substantial genetic contributions,” said Geschwind, chair in human genetics at the University of California, Los Angeles School of Medicine. “The question is how much is genetic and how much is environmental?”
The new study was published Sept. 26 in the Journal of the American Medical Association .