Nuclear RNA export.

RNA export is the process by which RNAs are transported to the cytoplasm after synthesis, processing, and RNP assembly within the nucleus. The primary focus of this review is mRNA export with particular attention paid to the yeast Saccharomyces cerevisiae. Because there is rather little known about mRNA export in general and even less about yeast mRNA export, our thinking about the problem is influenced by information from other transport processes. These include not only mRNA export in vertebrate systems but also studies on the export of other RNA substrates and even studies on protein import. Several of these areas of investigation have recently intersected in gratifying ways.