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Largest-ever search for autism genes reveals new clues

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)*.

The study is the first to emerge from the Autism Genome Project (AGP) Consortium, a public-private collaboration involving more than 120 scientists and 50 institutions in l9 countries. Their report is published online in the February 18, 2007 issue of Nature Genetics.

With NIH support, the AGP is pursuing studies to identify specific genes and gene variants that contribute to vulnerability to autism. These include explorations of interactions of genes with other genes and with environmental factors, and laboratory research aimed at understanding how candidate susceptibility genes might work in the brain to produce the disorders.

"This is the most ambitious effort yet to find the locations of genes that may confer vulnerability to autism," said NIH Director Elias A. Zerhouni, M.D. "The AGP is revealing clues that will likely influence the direction of autism research for years to come."

"Although we know autism is highly heritable, complex gene interactions and submicroscopic anomalies create a din of statistical noise that drowns out detection of signals from linked sites in the genome," explained Dr. Bernie Devlin, University of Pittsburgh, who served as a corresponding author on the project along with the University of Toronto's Dr. Stephen Scherer. "To amplify these signals, we brought to bear gene chip technology with a huge sample, and also screened for these fine-level anomalies, factoring them into the analysis."

Clues emerged adding to evidence that implicates components of the brain's glutama
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Contact: Jules Asher
NIMHpress@nih.gov
301-443-4536
NIH/National Institute of Mental Health
18-Feb-2007


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