Production of transgenic animal: Microinjection, electroporation, and nuclear transfer

The technology of transgenic animals' production is one of the areas of research in the biotechnology branch, which has a very fast growth rate in the last decade. To current knowledge, several methods have been developed for the production of transgenic animals such as microinjection of the desired genetic structure into the male pre-core in Zygote, gene transfer using embryonic stem cells transmission to the embryos during the blastocyst stage, gene transfer by sperm and using the new and workable CRISPER/Cas9 method. The key to success in the production of transgenic animals is the optimization of gene transfer method and the exact expression of the transmitted gene. A number of new technologies have been presented in the field of gene transfer in recent decades, which have reduced both research and production costs and improved the speed and delicacy of transmission processes. In the present review the most common methods in the production of transgenes would be discussed.