Highly efficient mRNA-based gene transfer in feeder-free cultured H9 human embryonic stem cells.

Several protocols have been described for virus-based gene transfer in human embryonic stem (hES) cells, while efficient non-viral methods are currently non-existing. In this study, we investigated the efficiency of mRNA-based gene transfer in feeder-free cultured H9 hES cells, based on electroporation of in vitro transcribed mRNA encoding the enhanced green fluorescent protein (EGFP). Optimisation of culture and electroporation conditions for feeder-free cultured H9 hES cells resulted a highly pure, transgene-expressing (90% positive cells) H9 hES cell population.