The Peperomia mitochondrial coxI group I intron: timing of horizontal transfer and subsequent evolution of the intron

The Peperomia polybotrya coxI gene intron is the only currently reported group I intron in a vascular plant mitochondrial genome and it likely originated by horizontal transfer from a fungal donor. We provide a clearer picture of the horizontal transfer and a portrayal of the evolution of the group...

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Bibliographic Details
Published in:Journal of molecular evolution 1998-06, Vol.46 (6), p.689-696
Main Authors: Adams, K.L. (Indiana University, Bloomington, IN.), Clements, M.J, Vaughn, J.C
Format: Article
Language:English
Subjects:
ADN
Base Sequence
CITOCROMO C OXIDASA
CYTOCHROME C OXIDASE
CYTOCHROME C OXYDASE
DNA
DNA, Mitochondrial - genetics
Electron Transport Complex IV - genetics
EVOLUCION
EVOLUTION
Evolution, Molecular
Exons
GENBANK/AF029781
GENBANK/AF029782
GENBANK/AF029783
GENBANK/AF029784
GENBANK/AF029785
GENE
GENES
Genes, Plant
GENETICA MITOCONDRIAL
GENETIQUE MITOCHONDRIALE
Genome, Plant
Introns - genetics
MITOCHONDRIA
MITOCHONDRIAL GENETICS
MITOCHONDRIE
MITOCONDRIA
MOLECULAR SEQUENCE DATA
MUTACION
MUTATION
NUCLEOTIDE SEQUENCE
PEPEROMIA
PHYLOGENETICS
Phylogeny
PSEUDOGENE
PSEUDOGENES
RECOMBINACION
RECOMBINAISON
RECOMBINATION
SECUENCIA NUCLEOTIDICA
Sequence Alignment
Sequence Homology, Nucleic Acid
SEQUENCE NUCLEOTIDIQUE
SEUDOGENES
STRUCTURAL GENES
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Description
Summary:The Peperomia polybotrya coxI gene intron is the only currently reported group I intron in a vascular plant mitochondrial genome and it likely originated by horizontal transfer from a fungal donor. We provide a clearer picture of the horizontal transfer and a portrayal of the evolution of the group I intron since it was gained by the Peperomia mitochondrial genome. The intron was transferred recently in terms of plant evolution, being restricted to the single genus Peperomia among the order Piperales. Additional support is presented for the suggestion that a recombination/repair mechanism was used by the intron for integration into the Peperomia mitochondrial genome, as a perfect 1:1 correspondence exists between the intron's presence in a species and the presence of divergent nucleotide markers flanking the intron insertion site. Sequencing of coxI introns from additional Peperomia species revealed that several mutations have occurred in the intron since the horizontal transfer, but sequence alterations have not caused frameshifts or created stop codons in the intronic open reading frame. In addition, two coxI pseudogenes in Peperomia cubensis were discovered that lack a large region of coxI exon 2 and contain a truncated version of the group I intron that likely cannot be spliced out
ISSN:0022-2844
1432-1432
DOI:10.1007/PL00006349