The largest search for autism genes to date, funded in part by the National Institutes of Health (NIH), has implicated components of the brain's glutamate chemical messenger system and a previously overlooked site on chromosome 11. Based on 1,168 families with at least two affected members, the genome scan adds to evidence that tiny, rare variations in genes may heighten risk for autism spectrum disorders (ASD)*.

Preliminary findings from the largest genome scan ever completed in the history of autism research are being published today in Nature Genetics. University of Pittsburgh researchers with a consortium of scientists from across the world contributed to this landmark research endeavor through the Autism Genome Project.

The first results from a scan of the world's largest collection of DNA samples from families affected by autism point to two new genetic links that may predispose people to the brain disorder. Nature Genetics reports the study's findings in its Feb. 18 online edition.