Balance tips toward environment as heritability ebbs in autism? Non-inherited genetic factors also in the mix, study finds

The largest and most rigorous twin study of its kind to date has found that shared environment influences susceptibility to autism more than previously thought. It found that experiences and exposures common to both twins accounted for 55 percent of strict autism and 58 percent of more broadly defined autism spectrum disorders (ASD). Genetic heritability accounted for 37 percent of autism and 38 percent of ASD.

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