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Misregulated genes may have big autism role
Date:3/21/2013

PROVIDENCE, R.I. [Brown University] A new study finds that two genes individually associated with rare autism-related disorders are also jointly linked to more general forms of autism. The finding suggests a new genetic pathway to investigate in general autism research.

The genes encode the proteins NHE6 and NHE9, which are responsible for biochemical exchanges in the endosomes of cells. Mutations in the NHE6 gene are a direct cause of Christianson Syndrome, while mutations in the NHE9 gene lead to a severe form of autism with epilepsy. In the new study, a statistical analysis published online this week in the journal Molecular Psychiatry, Brown University researchers and their colleagues found a specific pattern of misregulation of those two genes NHE9 is up-regulated and NHE6 is down-regulated in the brains of children with autism compared to the brains of non-autistic children.

"These genes play a role, not just in the rare forms of autism but also in the generalized pathology of autism," said Dr. Eric Morrow, professor of biology and professor of psychiatry and human behavior at Brown University, the paper's senior author. "In autism I think people get overwhelmed because there are hundreds of different genes. One of the important things is to find points of convergence where there are events that might be common across different forms."

The new study suggests that misregulation of NHE6 and NHE9 is one such event.

The research is based on a statistical analysis of messenger RNA samples from a bank of brain tissue donated posthumously by some children who had autism and some who did not. Messenger RNA is a key molecular player in the process of gene expression, making it an indicator of how gene expression was regulated in the cerebral cortex of each of the children.

Guided by Morrow, who studies autism genomics and sees autism patients at the E.P. Bradley Hospital in East Providence, lead author
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Contact: David Orenstein
david_orenstein@brown.edu
401-863-1862
Brown University
Source:Eurekalert  

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