[Envelope-type nano device for gene delivery].

We introduced a new concept "Programmed Packaging" for the rational development of non viral gene delivery system. There are many non-viral gene delivery system, however, their utility is limited in the in vitro experiments. The major reason is considered that it is difficult to package many functional devices into a nanoparticle. The new concept which we introduce here is named as Programmed Packaging, which is composed of the strategy to targeting, molecular design of functional devices to overcome barriers, and assembly technique to package them into a nanoparticle. In this article, we explain this concept and provide newly developed gene delivery systems based on this concept.