A non surgical embryo transfer device for producing gene modified rats

DESCRIPTION provided by applicant ParaTechs Corporation develops innovative technologies for biomedical research while seeking to improve animal welfare for laboratory animals One of ParaTechsandapos major goals is to further the guiding principles of ethical animal use by andapos reducing replacing and refiningandapos the use of animals in research according to the guidelines of Russell and Burchandapos s Rs of animal research ParaTechs already has brought to market a non surgical embryo transfer device NSETTM for mice which replaces surgical embryo transfers with a non surgical method that has been proven to cause less stress in research animals The goal of this project is to develop a device and a research protocol for nonsurgical embryo transfer in rats The device and protocol is to be rapid easy to use cost effective and efficien for embryo transfer Poof of principle for the project was established during Phase I where multiple prototypes of a rat NSET device were designed manufactured and tested Rat embryos were transferred and viable rat pups were obtained demonstrating the first successful nonsurgical embryo transfer in rats The goal of Phase II is to further establish the parameters of rat NSET technology and to develop the device for commercialization to the biomedical research community Four objectives are proposed to achieve this goal First we will determine the efficiency of non surgical embryo transfer relative to surgical embryo transfer in Sprague Dawley and Fischer rats for both morula and blastocyst stage embryos This study will have broad applications for transfer of cryopreserved embryos and for transfer of genetically modified embryos after introduction of embryonic stem cells Second we will transfer in vitro cultured embryos using the rNSET and compared efficiency to surgical embryo transfer techniques This aim will address successful transfer of rat embryos that may be modified very early in development for example after pronuclear injection for the purpose of genetic modification Third we will test the use of the rat NSET for artificial insemination as an alternative to surgical techniques This aim will support the use of the device as an alternative t surgical artificial insemination and as a possible alternative to in vitro fertilization Fourth w will assess the level of stress reduction of the NSET procedure compared to surgical embryo transfer These aims are consistent with ParaTechsandapos overall goal to improve animal welfare and support more effective and humane use of animal models in biomedical research PUBLIC HEALTH RELEVANCE The ability to genetically modify the laboratory rat is producing increasingly valuable and unique strains to investigate human disease Currently this technology is dependent on implanting embryos in female rats by surgical means ParaTechs proposes to develop and commercialize a unique device and technology for fast simple and painless nonsurgical embryo transfer NSET in rats which will support the Office of Laboratory Animal Welfare OLAW objectives of reducing pain and distress for laboratory animals because it will provide an alternative to surgical methods for assisted reproductive techniques