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Molecular therapy for spinal muscular atrophy closer to clinical use
Date:12/16/2008

COLUMBIA, Mo. Spinal muscular atrophy, a neurodegenerative disorder that causes the weakening of muscles, is the leading cause of infant death and occurs in 1 in 6,000 live births. While trans-splicing (a form of molecular therapy) has had impressive results as a treatment for spinal muscular atrophy in cell-based models of disease, scientists have been unable to translate the therapy to the human body. A University of Missouri researcher has developed a strategy that will enhance trans-splicing activity and bring it closer to being used in the clinical setting.

Spinal muscular atrophy is caused by the loss of survival motor neuron-1(SMN1). In humans, a nearly identical copy gene is present called SMN2. Because of a single molecular difference, SMN2 alone cannot compensate for the loss of SMN1, but it can be used as a primary target for therapeutics, including trans-splicing. Trans-splicing therapy relies on splicing, or uniting, of mutant RNA and therapeutic RNA in order to correct RNA sequence.

To improve efficiency, the researchers developed a trans-splicing system that uses a strand of RNA that can bind to a gene and inactivate it. Turning the gene "off" reduces competition at splice sites and improves the likelihood of achieving the desired results.

"The key to introducing trans-splicing in clinical settings is developing efficient trans-splicing systems," said Chris Lorson, investigator in the Christopher S. Bond Life Sciences Center; associate professor of veterinary pathobiology in the MU College Veterinary Medicine; and scientific director for Fight SMA, a private spinal muscular atrophy research foundation in Richmond, Va. "We have found that reducing the competition between the splice sites enhances the efficiency of trans-splicing. This strategy provides insight into the trans-splicing mechanism and significantly improves trans-splicing activity in a mouse model of spinal muscular atrophy. "


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Contact: Kelsey Jackson
JacksonKN@missouri.edu
573-882-8353
University of Missouri-Columbia
Source:Eurekalert

Page: 1

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