ArticlePloS one2012
Genomic heterogeneity in a natural archaeal population suggests a model of tRNA gene disruption.
Article in PloS one, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 9 citations in OpenAlex.
- Archaeal tyrosine recombinases.FEMS microbiology reviews · 2021Review
- Disrupted tRNA Genes and tRNA Fragments: A Perspective on tRNA Gene Evolution.Life (Basel, Switzerland) · 2015Review
- Circularly permuted tRNA genes: their expression and implications for their physiological relevance and development.Frontiers in genetics · 2014Review
- tRNA gene diversity in the three domains of life.Frontiers in genetics · 2014Review
- X-ray structure of the fourth type of archaeal tRNA splicing endonuclease: insights into the evolution of a novel three-unit composition and a unique loop involved in broad substrate specificity.Nucleic acids research · 2012Article
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Authors and funding
8 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Understanding the mechanistic basis of the disruption of tRNA genes, as manifested in the intron-containing and split tRNAs found in Archaea, will provide considerable insight into the evolution of the tRNA molecule. However, the evolutionary processes underlying these disruptions have not yet been identified. Previously, a composite genome of the deep-branching archaeon Caldiarchaeum subterraneum was reconstructed from a community genomic library prepared from a C. subterraneum-dominated microbial mat. Here, exploration of tRNA genes from the library reveals that there are at least three types of heterogeneity at the tRNA(Thr)(GGU) gene locus in the Caldiarchaeum population. All three involve intronic gain and splitting of the tRNA gene. Of two fosmid clones found that encode tRNA(Thr)(GGU), one (tRNA(Thr-I)) contains a single intron, whereas another (tRNA(Thr-II)) contains two introns. Notably, in the clone possessing tRNA(Thr-II), a 5' fragment of the tRNA(Thr-I) (tRNA(Thr-F)) gene was observed 1.8-kb upstream of tRNA(Thr-II). The composite genome contains both tRNA(Thr-II) and tRNA(Thr-F), although the loci are >500 kb apart. Given that the 1.8-kb sequence flanked by tRNA(Thr-F) and tRNA(Thr-II) is predicted to encode a DNA recombinase and occurs in six regions of the composite genome, it may be a transposable element. Furthermore, its dinucleotide composition is most similar to that of the pNOB8-type plasmid, which is known to integrate into archaeal tRNA genes. Based on these results, we propose that the gain of the tRNA intron and the scattering of the tRNA fragment occurred within a short time frame via the integration and recombination of a mobile genetic element.
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