Evolutionary origins of archaeal and eukaryotic RNA-guided RNA modification in bacterial IS110 transposons.

Lien vers Pubmed [PMID] – 39747689

Lien DOI – 10.1038/s41564-024-01889-2

Nat Microbiol 2025 Jan; ():

Transposase genes are ubiquitous in all domains of life and provide a rich reservoir for the evolution of novel protein functions. Here we report deep evolutionary links between bacterial IS110-family transposases, which catalyse RNA-guided DNA recombination using bridge RNAs, and archaeal/eukaryotic Nop5-family proteins, which promote RNA-guided RNA 2′-O-methylation using C/D-box snoRNAs. On the basis of conservation of protein sequence, domain architecture, three-dimensional structure and non-coding RNA features, alongside phylogenetic analyses, we propose that programmable RNA modification emerged through the exaptation of components derived from IS110-like transposons. These findings underscore how recurrent domestication events of transposable elements have driven the evolution of RNA-guided mechanisms.