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. 2013 Jun 5;4:17. doi: 10.1186/1759-8753-4-17

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Copyright © 2013 Hedberg and Johansen; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Schematic structural organization of the four main categories of group I introns observed in myxomycete rDNA. (A) Self-splicing and mobile introns with homing endonuclease genes (HEGs). (B) Self-splicing all-ribozyme introns without HEG. (C) Optional host-dependent introns with structural extensions available for host factors (green), here exemplified as associated with P8. (D) Obligatory host-dependent introns with large extension either associated with host factors and/or containing direct repeats (P9) or other motifs with the potential for being regulatory RNA domains (pink). HEG: homing endonuclease gene; rDNA: ribosomal DNA.