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The mitochondrial genome of the pelagic chaetognath, Pterosagitta draco.

ABSTRACT: Pterosagitta draco is an important predator in many food webs, and so maintaining the diversity study of Pterosagitta draco in marine ecosystem is essential. In this paper, the complete mitochondrial genome sequence of Pterosagitta draco was determined. Its complete mtDNA sequence is 10,426?bp in length, which contains 11 protein-coding genes (PCGs), 6 transfer RNA genes and 2 ribosomal RNA genes. The composition of A, T, G, C in mtDNA is 27.63%, 23.61%, 23.53% and 25.23%, respectively. The percentage of A?+?T is 51.24%. The complete mitochondrial genome sequence would be useful for further phylogenetic analysis in Pterosagitta draco.

SUBMITTER: Wei S

PROVIDER: S-EPMC7799529 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature

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The mitochondrial genome of the pelagic chaetognath, Pterosagitta draco.

Wei Shina S Li Pengfei P Yang Min M Zhou Lingli L Yu Yepin Y Ni Songwei S Wang Zhuxi Z Qin Qiwei Q

Mitochondrial DNA. Part B, Resources 20160712 1

Pterosagitta draco is an important predator in many food webs, and so maintaining the diversity study of Pterosagitta draco in marine ecosystem is essential. In this paper, the complete mitochondrial genome sequence of Pterosagitta draco was determined. Its complete mtDNA sequence is 10,426 bp in length, which contains 11 protein-coding genes (PCGs), 6 transfer RNA genes and 2 ribosomal RNA genes. The composition of A, T, G, C in mtDNA is 27.63%, 23.61%, 23.53% and 25.23%, r ...[more]

PMID: 33473539

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Project description:BackgroundA recent study by Barthélémy et al. described a set of ribosomal protein (RP) genes extracted from a collection of expressed sequence tags (ESTs) of the chaetognath (arrow worm) Spadella cephaloptera. Three main conclusions were drawn in this paper. First, the authors stated that RP genes present paralogous copies, which have arisen through allopolyploidization. Second, they reported two alternate nucleotide stretches conserved within the 5' untranslated regions (UTR) of multiple ribosomal cDNAs and they suggested that these motifs are involved in the differential transcriptional regulation of paralogous RP genes. Third, they claimed that the phylogenetic position of chaetognaths could not be accurately inferred from a RP dataset because of the persistence of two problems: a long branch attraction (LBA) artefact and a compositional bias.ResultsWe reconsider here the results described in Barthélémy et al. and question the evidence on which they are based. We find that their evidence for paralogous copies relies on faulty PCR experiments since they attempted to amplify DNA fragments absent from the genomic template. Our PCR experiments proved that the conserved motifs in 5'UTRs that they targeted in their amplifications are added post-transcriptionally by a trans-splicing mechanism. Then, we showed that the lack of phylogenetic resolution observed by these authors is due to limited taxon sampling and not to LBA or to compositional bias. A ribosomal protein dataset thus fully supports the position of chaetognaths as sister group of all other protostomes. This reinterpretation demonstrates that the statements of Barthélémy et al. should be taken with caution because they rely on inaccurate evidence.ConclusionThe genomic study of an unconventional model organism is a meaningful approach to understand the evolution of animals. However, the previous study came to incorrect conclusions on the basis of experiments that omitted validation procedures.

Dataset Information

The mitochondrial genome of the pelagic chaetognath, Pterosagitta draco.

Publications

The mitochondrial genome of the pelagic chaetognath, <i>Pterosagitta draco</i>.

Similar Datasets

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