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VIRxSYS Publishes New Study on RNA Therapy
Date:4/6/2009

New RNA therapy reversed hemophilia in mice

GAITHERSBURG, Md., April 6 /PRNewswire/ -- VIRxSYS Corporation announced today the publication of a new research article, "Trans-splicing into Highly Abundant Albumin Transcripts for Production of Therapeutic Proteins In Vivo," in the journal Molecular Therapy. The study describes a novel RNA therapy technique in which an RNA molecule that is inserted into the albumin gene "hijacks" the albumin, causing it to produce the newly added gene's proteins instead of its own. Using this strategy, the researchers were able to produce three different therapeutic proteins in animals. With one of these, Factor VIII, they showed they could correct hemophilia A in mice. The researchers believe their technology can be used to produce therapeutic proteins in humans.

"Two of the RNA molecules that were spliced into albumin are normally produced in the liver. These are the apoA-I, which produces the principal protein in good cholesterol, and Factor VIII, which makes the protein missing in patients with hemophilia A. We instructed the liver to make more apoA-I protein than it normally does, and in separate experiments we instructed the liver to make the correct form of Factor VIII instead of a mutated form. We also added an RNA molecule that makes a monoclonal antibody that is not normally produced in liver," said VIRxSYS Executive Vice President of Scientific and Clinical Affairs, Gerard J. McGarrity, Ph.D. "The work is at an early stage, but we are definitely teaching old genes some new tricks."

Albumin is the most abundantly expressed gene in liver. Results showed that each of the three gene sequences spliced into the albumin gene sequence was expressed in high concentrations by liver cells in laboratory mice. The specific approach that is used ensures that added RNA was only expressed in liver cells, and not in other cells, which could have triggere
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