ABSTRACT
Spermatogonial stem cells [SSCs] are the only stem cells in adults that can transfer genetic information to the future generations. Considering the fact that a single SSC gives rise to a vast number of spermatozoa, genetic manipulation of these cells is a potential novel technology with feasible application to various animal species. The aim of this study was to evaluate enhanced green fluorescent protein [EGFP] gene transfection into bovine SSCs via liposome carrier and assess the best incubation day in uptake exogenous gene by SSCs. Transfection efficiency of EGFP gene with lipofectamine 2000 was determined in days following each three day of transfection [day 4, 6 and 8 of the culture] by fluorescent microscope. Results showed that the transfected cells through lipofection increased significantly [P<0.05] in each three days of transfection in comparison with those of the control groups. The transfected SSCs were higher in comparison with those of the free exogenous gene carrier groups [P<0.05]. In comparison with these three days, the rate of infected cells was higher when transfection proceeds at day four. It was concluded that lipofectamine can be used safely for direct loading exogenous DNA to SSCs particularly during the fourth day of culture