RNA interference (RNAi) libraries have been proven to be a powerful tool for large-scale functional genetic screens. To facilitate high-throughput functional genetic screens in embryonic stem cells, a system for construction of random dsRNA expressing RNAi libraries was developed. Previous studies have demonstrated that sequence-specific gene silencing could be induced by long dsRNA in mouse embryos, mouse oocytes, embryonic stem cells, and some other mammalian cells. Our study demonstrated that the dsRNA interference library can be used for functional genetic screens of genes involved in self-renewal of embryonic stem cells (ES cells). The random RNAi library is easy to construct and provides a useful tool for investigation of molecular mechanisms of cellular development and differentiation.
