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Study of half siblings provides genetic clues to autism
Date:4/17/2012

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When a child has autism, siblings are also at risk for the disorder. New research from Washington University School of Medicine in St. Louis shows that the genetic reach of the disorder often extends to half siblings as well.

On the surface, the finding may not be surprising half siblings share about 25 percent of their genes. But the discovery is giving scientists new clues to how autism is inherited.

The study is published online in the journal Molecular Psychiatry.

According to principal investigator John N. Constantino, MD, the new research adds to recent evidence that even though autism is far more common in males, females still can inherit and pass along genetic risk for autism.

"We found that autism risk for half siblings is about half of what it is for full siblings," he says. "Most of the half siblings we studied had the same
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Contact: Judy Martin
martinju@wustl.edu
314-750-4213
Washington University in St. Louis
Source:Eurekalert

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