Simple and Efficient Transgenesis with I-SceI Meganuclease in the Newt, Cynops pyrrhogaster

Newts have been recognized as an ideal model for body-parts regeneration after traumatic injury since the 18(th) century. However, molecular mechanisms underlying regeneration remain a mystery because of technical limitations. In the current study, to break this obstacle, we established a simple and efficient transgenic protocol for the newt Cynops pyrrhogaster by adapting an I-SceI microinjection technique, as well as a two-aquarium-tank (TAT) system that allows us to constantly obtain fertilized eggs in the laboratory for transgenesis. Following our protocol, similar to 20% of injected embryos would exhibit non-mosaic widespread transgene expression and survive beyond metamorphosis. This anticipated success rate is about 10 times higher than that obtained by previous protocols, reaching a practical level. Therefore, our transgenic protocol in conjunction with the TAT-system could provide a key technique to open the way to uncover the long mystery underlying body-parts regeneration of newts. Developmental Dynamics 239:3275-3284, 2010. (C) 2010 Wiley-Liss, Inc.