In order to investigate the earliest molecular mechanisms of germ cell specification, mouse embryonic stem cells were differentiated into putative primordial germ cells (PGCs) in vitro. The use of inhibitory RNAs to then screen candidate genes for effects on the development of these cells demonstrates a genetic pathway for PGC specification involving Lin28, a negative regulator of let-7 microRNA processing.
- Jason A. West
- Srinivas R. Viswanathan
- George Q. Daley