ArticleNucleic acids research1995
Evidence for the late origin of introns in chloroplast genes from an evolutionary analysis of the genus Euglena.
Article in Nucleic acids research, 1995. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 12 papers.
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12 citing papers in PubMed, 50 citations in OpenAlex.
- Categorizing 161 plant (streptophyte) mitochondrial group II introns into 29 families of related paralogues finds only limited links between intron mobility and intron-borne maturases.BMC ecology and evolution · 2023Article
- Group II intron and repeat-rich red algal mitochondrial genomes demonstrate the dynamic recent history of autocatalytic RNAs.BMC biology · 2022Article
- A functional twintron, 'zombie' twintrons and a hypermobile group II intron invading itself in plant mitochondria.Nucleic acids research · 2020Article
- Chloroplast genome expansion by intron multiplication in the basal psychrophilic euglenoidPeerJ · 2017Article
- The plastid genome of Eutreptiella provides a window into the process of secondary endosymbiosis of plastid in euglenids.PloS one · 2012Article
- Article
- Transcriptome analysis of the Euglena gracilis plastid chromosome.Current genetics · 2009Article
- Article
- Recent horizontal intron transfer to a chloroplast genome.Nucleic acids research · 2004Article
- Genomic reduction and evolution of novel genetic membranes and protein-targeting machinery in eukaryote-eukaryote chimaeras (meta-algae).Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2003Article
- Identification and comparative analysis of the chloroplast alpha-subunit gene of DNA-dependent RNA polymerase from seven Euglena species.Nucleic acids research · 2002Article
- Complete nucleotide sequence of the chloroplast genome from the green alga Chlorella vulgaris: the existence of genes possibly involved in chloroplast division.Proceedings of the National Academy of Sciences of the United States of America · 1997Article
Corrections and comments
- Erratum issued
- Erratum issued
Authors and funding
5 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The origin of present day introns is a subject of spirited debate. Any intron evolution theory must account for not only nuclear spliceosomal introns but also their antecedents. The evolution of group II introns is fundamental to this debate, since group II introns are the proposed progenitors of nuclear spliceosomal introns and are found in ancient genes from modern organisms. We have studied the evolution of chloroplast introns and twintrons (introns within introns) in the genus Euglena. Our hypothesis is that Euglena chloroplast introns arose late in the evolution of this lineage and that twintrons were formed by the insertion of one or more introns into existing introns. In the present study we find that 22 out of 26 introns surveyed in six different photosynthesis-related genes from the plastid DNA of Euglena gracilis are not present in one or more basally branching Euglena spp. These results are supportive of a late origin for Euglena chloroplast group II introns. The psbT gene in Euglena viridis, a basally branching Euglena species, contains a single intron in the identical position to a psbT twintron from E.gracilis, a derived species. The E.viridis intron, when compared with 99 other Euglena group II introns, is most similar to the external intron of the E.gracilis psbT twintron. Based on these data, the addition of introns to the ancestral psbT intron in the common ancester of E.viridis and E.gracilis gave rise to the psbT twintron in E.gracilis.
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