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Penn Veterinary Medicine report new strategy to create genetically modified animals
Date:9/20/2007

irradiation. Transgenic germ cells colonized recipient testes and produced transgenic sperm. When semen was used for in vitro fertilization, 10 percent of embryos were transgenic.

Initially, the team used the established germ cell transplantation model in the mouse to investigate whether AAV-mediated transduction of germ cells was possible and could result in transgene transmission, Dobrinski said. To broaden the applicability of the results for different mammalian species, the approach was then applied to a large animal species in which germ cell transplantation-mediated transgenesis would provide an important alternate approach to the generation of transgenic animal models for biomedical research.

Currently, somatic cell nuclear transfer or pronuclear injection is used to generate transgenic animals. These inefficient and difficult methods also carry a risk of producing offspring with developmental abnormalities. The use of retroviral or lentiviral vectors has been reported in rodents, but it requires that animals be handled and maintained under higher biosafety precautions that render this approach less practical for transgenesis in large animal species. In contrast, animals exposed to AAV can be maintained under standard husbandry conditions.

AAV is a dependent virus that carries no disease and causes only a very mild response from the immune system. Because AAV can infect both dividing and non-dividing cells and passes its genome, it is considered an excellent candidate for use in gene therapy.


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Contact: Jordan Reese
jreese@pobox.upenn.edu
215-573-6604
University of Pennsylvania
Source:Eurekalert

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