Autism Caused by Random Genetic Mutations: Study

Siblings with autism often have DNA mutations that are very different from each other, which suggests that autism is often genetic happenstance, according to a new study. An analysis of the DNA of 170 people with autism spectrum disorder shows that 69 percent of brothers and sisters with autism had different DNA mutations underlying their disorders. "It's random mutation in these families. It just happens to be lightning striking twice," said one of the study's authors.

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