Journal
JOURNAL OF MOLECULAR EVOLUTION
Volume 85, Issue 1-2, Pages 37-45Publisher
SPRINGER
DOI: 10.1007/s00239-017-9803-y
Keywords
Intron; RNA secondary structure; Sm-binding site; SL-RNA; Spliceosome
Funding
- Scientific Grant Agency of the Slovak Ministry of Education
- Academy of Sciences [VEGA 1/0626/13, 1/0535/17]
- Research & Development Operational Programme - ERDF [ITMS 26210120024]
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Trans-splicing is a process by which 5'- and 3'-ends of two pre-RNA molecules transcribed from different sites of the genome can be joined together to form a single RNA molecule. The spliced leader (SL) trans-splicing is mediated by the spliceosome and it allows the replacement of 5'-end of pre-mRNA by 5'(SL)-end of SL-RNA. This form of splicing has been observed in many phylogenetically unrelated eukaryotes. Either the SL trans-splicing (SLTS) originated in the last eukaryotic common ancestor (LECA) (or even earlier) and it was lost in most eukaryotic lineages, or this mechanism of RNA processing evolved several times independently in various unrelated eukaryotic taxa. The bioinformatic comparisons of SL-RNAs from various eukaryotic taxonomic groups have revealed the similarities of secondary structures of most SL-RNAs and a relative conservation of their splice sites (SSs) and Sm-binding sites (SmBSs). We propose that such structural and functional similarities of SL-RNAs are unlikely to have evolved repeatedly many times. Hence, we favor the scenario of an early evolutionary origin for the SLTS and multiple losses of SL-RNAs in various eukaryotic lineages.
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