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.
![genetic-risk-autism.png Genetic risk autism](https://www.highlighthealth.com/wp-content/uploads/2014/07/genetic-risk-autism.png)