West Lafayette, IN For scientists working to develop gene transfer and gene therapies, finding an ideal carrier system is half the battle. Current systems are often difficult to produce, and may target only a few cells or offer merely a temporary effect.
Purdue University researchers have combined the traits of two types of viruses to be used as a new delivery system that can carry genes into a wider range of cell types and provide a more stable transfer of genetic material.
The result is a delivery system with the potential for broad applications that may someday be used to treat cancer, diabetes and other diseases caused by an underlying genetic deficiency, says David Sanders, assistant professor of biological sciences at Purdue and the study's principal investigator. "This new system allows us to infiltrate different types of cells than is currently possible, thus increasing the types of tissues and organisms that we can treat using genetic therapies," Sanders says. The new virus delivery system also can be used by scientists to enhance studies on a group of viruses known as alphaviruses. Alphaviruses, including the Sindbis virus and Semliki Forest virus, are a family of viruses often transmitted to humans by insects and can cause neurological disease and arthritis. "These viruses are fairly difficult to study because they pose some health risks," Sanders says. "Also, because they kill cells, scientists were previously unable to study the process of how the virus enters the cell. This new delivery system has allowed us to separate the entry step from other steps of alphavirus replication."
Details of the study were published in the March issue of the Journal of Virology.
Sanders and his Purdue colleague, Associate Professor Richard Kuhn, developed the new gene delivery system by replacing the outer protein shell of a virus, known as retrovirus, with the coat of an alphavirus. This combination virus is called a pseudotyped retrovirus because it infec
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Contact: Susan Gaidos
sgaidos@purdue.edu
765-494-2081
Purdue University
20-Mar-2001