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One Shot of Gene Therapy Spreads Through Brain in Animal Study
Date:10/8/2007

- Method Has Potential for Correcting Devastating Genetic Diseases -

PHILADELPHIA, Oct. 8 /PRNewswire-USNewswire/ -- By targeting a site in a mouse brain well connected to other areas, researchers successfully delivered a beneficial gene to the entire brain -- after one injection of gene therapy. If these results in animals can be realized in people, researchers may have a potential method for gene therapy to treat a host of rare but devastating congenital human neurological disorders, such as Tay-Sachs disease.

Researchers from The Children's Hospital of Philadelphia and the University of Pennsylvania reported their findings in the September 12 issue of the Journal of Neuroscience.

"After a single injection, this technique succeeded in correcting diseased areas throughout the brain," said study leader John H. Wolfe, V.M.D., Ph.D., a neurology researcher at The Children's Hospital of Philadelphia and a professor of pathology and medical genetics at the Penn School of Veterinary Medicine. "This may represent a new strategy for treating genetic diseases of the central nervous system."

Wolfe and Penn graduate student Cassia N. Cearley performed the study in mice specially bred to have the neurogenetic disease mucopolysaccharidosis type VII (MPS VII). In people, MPS VII, also called Sly syndrome, is a rare, multisystem disease causing mental retardation and death in childhood or early adulthood.

Sly syndrome is one of a class of some 60 disorders called lysosomal storage diseases that collectively cause disabilities in about one in 5,000 births. Those diseases account for a significant share of childhood mental retardation and severe, often fatal, disabilities. In each of the lysosomal storage diseases, a defect in a specific gene disrupts the production of an enzyme that cleans up waste products from cells. Cellular debris builds up within cell storage sites called lysosomes, and the waste deposits interfere with basic cell functio
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SOURCE Children's Hospital of Philadelphia
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