Journal
RNA BIOLOGY
Volume 12, Issue 12, Pages 1275-1288Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15476286.2015.1103427
Keywords
group I and II introns; intron shuffling; nested introns; ribozymes; spliceosome; Twintrons; tRNA introns
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
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Introns inserted within introns are commonly referred to as twintrons, however the original definition for twintron implied that splicing of the external member of the twintron could only proceed upon splicing of the internal member. This review examines the various types of twintron-like arrangements that have been reported and assigns them to either nested or twintron categories that are subdivided further into subtypes based on differences of their mode of splicing. Twintron-like arrangements evolved independently by fortuitous events among different types of introns but once formed they offer opportunities for the evolution of new regulatory strategies and/or novel genetic elements.
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