Complete nucleotide sequences of mitochondrial genomes of two solitary entoprocts, Loxocorone allax and Loxosomella aloxiata: Implications for lophotrochozoan phylogeny

Shin ichi Yokobori, Tohru Iseto, Shuichi Asakawa, Takashi Sasaki, Nobuyoshi Shimizu, Akihiko Yamagishi, Tairo Oshima, Euichi Hirose

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Abstract

The complete nucleotide sequences of the mitochondrial (mt) genomes of the entoprocts Loxocorone allax and Loxosomella aloxiata were determined. Both species carry the typical gene set of metazoan mt genomes and have similar organizations of their mt genes. However, they show differences in the positions of two tRNALeu genes. Additionally, the tRNAVal gene, and half of the long non-coding region, is duplicated and inverted in the Loxos. aloxiata mt genome. The initiation codon of the Loxos. aloxiata cytochrome oxidase subunit I gene is expected to be ACG rather than AUG. The mt gene organizations in these two entoproct species most closely resemble those of mollusks such as Katharina tunicata and Octopus vulgaris, which have the most evolutionarily conserved mt gene organization reported to date in mollusks. Analyses of the mt gene organization in the lophotrochozoan phyla (Annelida, Brachiopoda, Echiura, Entoprocta, Mollusca, Nemertea, and Phoronida) suggested a close phylogenetic relationship between Brachiopoda, Annelida, and Echiura. However, Phoronida was excluded from this grouping. Molecular phylogenetic analyses based on the sequences of mt protein-coding genes suggested a possible close relationship between Entoprocta and Phoronida, and a close relationship among Brachiopoda, Annelida, and Echiura.

Original languageEnglish
Pages (from-to)612-628
Number of pages17
JournalMolecular Phylogenetics and Evolution
Volume47
Issue number2
DOIs
Publication statusPublished - 2008 May 1

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Keywords

  • Entoprocta (Kamptozoa)
  • Gene organization
  • Lophotrochozoa
  • Mitochondrial genome

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

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