Mitogenome of a stink worm (Annelida: Travisiidae) includes degenerate group II intron that is also found in five congeneric species

Mitogenomes are useful for inferring phylogenetic relationships between organisms. Although the mitogenomes of Annelida, one of the most morphologically and ecologically diverse metazoan groups have been well sequenced, those of several families remain unexamined. This study determined the first mit...

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Bibliographic Details
Published in:Scientific reports 2022-03, Vol.12 (1), p.4449-4449, Article 4449
Main Authors: Kobayashi, Genki, Itoh, Hajime, Kojima, Shigeaki
Format: Article
Language:English
Subjects:
631/181/757
631/208/182
631/208/212
Animals
Annelida
Annelida - genetics
Evolution, Molecular
Genome, Mitochondrial - genetics
Humanities and Social Sciences
Humans
Introns
Introns - genetics
Mitochondria
multidisciplinary
Open reading frames
Phylogenetics
Phylogeny
Science
Science (multidisciplinary)
Travisia
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Summary:Mitogenomes are useful for inferring phylogenetic relationships between organisms. Although the mitogenomes of Annelida, one of the most morphologically and ecologically diverse metazoan groups have been well sequenced, those of several families remain unexamined. This study determined the first mitogenome from the family Travisiidae ( Travisia sanrikuensis ), analyzed its mitogenomic features, and reconstructed a phylogeny of Sedentaria. The monophyly of the Terebellida + Arenicolida + Travisiidae clade is supported by molecular phylogenetic analysis. The placement of Travisiidae is unclear because of the lack of mitogenomes from closely related lineages. An unexpected intron appeared within the cox1 gene of T. sanrikuensis and in the same positions of five undescribed Travisia spp. Although the introns are shorter (790–1386 bp) than other group II introns, they can be considered degenerate group II introns due to type II intron maturase open reading frames, found in two of the examined species, and motifs characteristic of group II introns. This is likely the first known case in metazoans where mitochondrial group II introns obtained by a common ancestor are conserved in several descendants. Insufficient evolutionary time for intron loss in Travisiidae, or undetermined mechanisms may have helped maintain the degenerate introns.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-08103-5