Trans-splicing of organelle introns – a detour to continuous RNAs
Article first published online: 30 JUL 2009
Copyright © 2009 Wiley Periodicals, Inc.
Volume 31, Issue 9, pages 921–934, September 2009
How to Cite
Glanz, S. and Kück, U. (2009), Trans-splicing of organelle introns – a detour to continuous RNAs. Bioessays, 31: 921–934. doi: 10.1002/bies.200900036
- Issue published online: 12 AUG 2009
- Article first published online: 30 JUL 2009
- chloroplasts and mitochondria;
- group II introns;
- organelle spliceosome;
In eukaryotes, RNA trans-splicing is an important RNA-processing form for the end-to-end ligation of primary transcripts that are derived from separately transcribed exons. So far, three different categories of RNA trans-splicing have been found in organisms as diverse as algae to man. Here, we review one of these categories: the trans-splicing of discontinuous group II introns, which occurs in chloroplasts and mitochondria of lower eukaryotes and plants. Trans-spliced exons can be predicted from DNA sequences derived from a large number of sequenced organelle genomes. Further molecular genetic analysis of mutants has unravelled proteins, some of which being part of high-molecular-weight complexes that promote the splicing process. Based on data derived from the alga Chlamydomonas reinhardtii, a model is provided which defines the composition of an organelle spliceosome. This will have a general relevance for understanding the function of RNA-processing machineries in eukaryotic organelles.