From the National Institutes of Health
Most of the genetic risk for autism comes from versions of genes that are common in the population rather than from rare variants or spontaneous glitches, researchers funded by the
National Institutes of Health have found. Heritability also outweighed other risk factors in this largest study of its kind to date.
About 52 percent of the risk for autism was traced to common and rare inherited variation, with spontaneous mutations contributing a modest 2.6 percent of the total risk.
“Although each exerts just a tiny effect individually, these common variations in the genetic code add up to substantial impact, taken together,” Buxbaum said. Continue reading