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Gene linked to common intellectual disability
Date:11/13/2013

University of Adelaide researchers have taken a step forward in unravelling the causes of a commonly inherited intellectual disability, finding that a genetic mutation leads to a reduction in certain proteins in the brain.

ARX is among the top four types of intellectual disability linked to the X-chromosome in males. So far, 115 families, including many large Australian families, have been discovered to carry an ARX (Aristaless related homeobox) mutation that gives rise to intellectual disability.

"There is considerable variation in the disability across families, and within families with a single mutation. Symptoms among males always include intellectual disability, as well as a range of movement disorders of the hand, and in some cases severe seizures," says Associate Professor Cheryl Shoubridge, Head of Molecular Neurogenetics with the University of Adelaide's Robinson Institute.

ARX mutations were first discovered by the University of Adelaide's Professor Jozef Gecz in 2002. To date, researchers have detected 52 different ARX mutations and 10 distinct clinical syndromes.

Associate Professor Shoubridge is lead author of a new paper on ARX intellectual disability published in the journal Human Molecular Genetics.

In laboratory studies, Associate Professor Shoubridge's team has shown that mutations lead to a significant reduction in ARX proteins in the brain, but the actual causes and mechanisms involved in this remain unknown. Her team tested six genes that the ARX protein interacts with, and found that one of them a gene likely to be important to early brain development appears to be adversely affected by the reduction of ARX proteins.

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Contact: Cheryl Shoubridge
cheryl.shoubridge@adelaide.edu.au
61-881-618-105
University of Adelaide
Source:Eurekalert

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