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UC San Diego researchers find cause of metabolic disease -- and possible cure
Date:7/15/2010

An international team of scientists, led by researchers at the University of California, San Diego School of Medicine, has discovered the gene mutation responsible for a condition in which eye and brain development is severely disrupted in affected infants.

They also suggest a potential remedy that would involve a simple, daily dietary supplement.

The condition is one of the congenital disorders of glycosylation or CDG, a group of syndromes in which inborn metabolic errors result in serious, sometimes fatal, malfunctions of different organ systems, especially the nervous system, muscles and intestines. Children and adults with CDG have varying degrees of disability, including cognitive impairment and speech difficulties, poor motor skills, vision problems and stroke-like episodes. CDG is rare, but for most of the disorders, there is no treatment.

Writing in the July 15 online edition of the journal Cell, Joseph G. Gleeson, MD, professor of neurosciences and pediatrics at UC San Diego, with Lihadh Al-Gazali, a professor of pediatrics and pathology at United Arab Emirates University, and colleagues discovered that the gene SRD5A3 is responsible for the synthesis of a lipid used by cells as a sugar carrier for protein glycosylation a complicated, multi-part process in which proteins are modified by the addition of a sugar or sugar chain. Without the added sugars, proteins do not fold or fold incorrectly, resulting in dysfunction and disease.

The UCSD work revealed the molecular basis of an essential, but mysterious, enzymatic reaction in protein glycosylation. "We found the long-sought polyprenol reductase that has been suspected for decades" said Gleeson, a Howard Hughes Medical Institute Investigator who supervised the research. "Using a human genetic approach, we were able to not only find a clue to understand this class of disorder, but also to solve a basic science problem."

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Contact: Scott LaFee
slafee@ucsd.edu
619-543-6163
University of California - San Diego
Source:Eurekalert

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