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Recurrent genetic deletion linked to autism
Date:1/8/2008

Loss of a small portion of chromosome 16, known as 16p11.2, is significantly associated with autism report researchers from the University of Chicago Medical Center, the University of Illinois at Chicago, and the Roswell Park Cancer Institute in an article, published Dec. 21, 2007, online by the journal Human Molecular Genetics.

Although this genetic "microdeletion" occurred in only four out of 712 subjects with autism (0.6%), it is the second most common recurrent genomic disorder associated with autism, which affects about one out of 160 children in the United States.

"We suspect that 16p11.2 microdeletions are a risk factor for autism spectrum disorders generally and may cause mild autism in some families," said study author Susan Christian, PhD, associate professor of human genetics at the University of Chicago. "By disturbing the network of affected genes, this loss of selected genes may underlie the development of autism."

The deletion results in the loss of about 25 known genes. "Twelve of those genes appear to be part of a single genetic network that includes genes involved in cell-to-cell signaling and interaction," said first author Ravinesh A. Kumar, PhD. postdoctoral scientist in human genetics at the University of Chicago, "At least three of the deleted genes are primarily expressed in the brain and are thought to influence behavior," he added, "which makes them very promising candidates for autism."

The authors suspect the lost or damaged genes may also be involved in other cognitive, language and social impairments.

To find genes linked to autism, the researchers scanned the entire genomes of 180 subjects with autism searching for submicroscopic pieces of DNA that were either lost or mistakenly duplicated in patients diagnosed with autism. They first found that two out of those 180 (1.1%) had a deletion in region 16p11.2, on the short arm of chromosome 16. None of the 372 control subjects had the sam
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Contact: John Easton
John.Easton@uchospitals.edu
773-702-6241
University of Chicago Medical Center
Source:Eurekalert

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