Techniques to label mRNA with green fluorescent protein (GFP) have provided
the first real-time images of RNA motility in live yeast cells. Genetic sc
reens for factors responsible for mRNA asymmetry (e.g. SHE genes) in yeast
identified type V myosin among other proteins. Analysis of mRNA movement in
various she mutants revealed the role of motor proteins in long-range tran
sport, factors for particle formation, and cortical anchors for docking the
mRNA.