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UNC child neurologist finds potential route to better treatments for Fragile X, autism
Date:10/23/2013

CHAPEL HILL, N.C. When you experience something, neurons in the brain send chemical signals called neurotransmitters across synapses to receptors on other neurons. How well that process unfolds determines how you comprehend the experience and what behaviors might follow. In people with Fragile X syndrome, a third of whom are eventually diagnosed with Autism Spectrum Disorder, that process is severely hindered, leading to intellectual impairments and abnormal behaviors.

In a study published in the online journal PLOS ONE, a team of UNC School of Medicine researchers led by neurologist C.J. Malanga, MD, PhD, describes a major reason why current medications only moderately alleviate Fragile X symptoms. Using mouse models, Malanga discovered that three specific drugs affect three different kinds of neurotransmitter receptors that all seem to play roles in Fragile X. As a result, current Fragile X drugs have limited benefit because most of them only affect one receptor.

"There likely won't be one magic bullet that really helps people with Fragile X," said Malanga, an associate professor in the Department of Neurology. "It's going to take therapies acting through different receptors to improve their behavioral symptoms and intellectual outcomes."

Nearly one million people in the United States have Fragile X Syndrome, which is the result of a single mutated gene called FMR1. In people without Fragile X, the gene produces a protein that helps maintain the proper strength of synaptic communication between neurons. In people with Fragile X, FMR1 doesn't produce the protein, the synaptic connection weakens, and there's a decrease in synaptic input, leading to mild to severe learning disabilities and behavioral issues, such as hyperactivity, anxiety, and sensitivity to sensory stimulation, especially touch and noise.

More than two decades ago, researchers discovered that in people with mental and behavior problems a receptor cal
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Contact: Mark Derewicz
mark.derewicz@unch.unc.edu
919-923-0959
University of North Carolina Health Care
Source:Eurekalert

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