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Complete mitochondrial genome sequence of Acromitus flagellatus and its phylogenetic relationship with related jellyfish species.

ABSTRACT: This study describes the complete mitochondrial genome sequence of the scyphozoan Acromitus flagellatus (Maas, 1903), a blooming jellyfish found in the coastal areas of Hainan, China. Its mitochondrial DNA is 16,779 bp in length and has a linear structure, comprising 13 protein-coding genes (PCGs), two rRNAs (s-rRNA and l-rRNA), and two tRNAs (trna-W-TCA and trna-M-CAT). A + T content was 65.39% (A: 29.27%, C: 16.59%, G: 18.03%, and T: 36.12%). ATG was the start codon in 11 PCGs: COX1, COX2, ATP8, ATP6, COX3, NAD2, NAD6, NAD4l, NAD1, NAD4, and COB. NAD5 and NAD3 had GTG as the start codon. TAG was the stop codon for COX2, NAD6, and COB. The other 10 PCGs were terminated by TAA. The neighbor-joining phylogenetic tree of the 15 related jellyfish species showed that A. flagellatus is closely related to Nemopilema nomurai and Rhopilema esculentum.

SUBMITTER: Lin J

PROVIDER: S-EPMC9602930 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature

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Complete mitochondrial genome sequence of Acromitus flagellatus and its phylogenetic relationship with related jellyfish species.

Lin Jianing J Feng Song S Wang Lijuan L Qiu Yanhao Y

Mitochondrial DNA. Part B, Resources 20221021 10

This study describes the complete mitochondrial genome sequence of the scyphozoan Acromitus flagellatus (Maas, 1903), a blooming jellyfish found in the coastal areas of Hainan, China. Its mitochondrial DNA is 16,779 bp in length and has a linear structure, comprising 13 protein-coding genes (PCGs), two rRNAs (s-rRNA and l-rRNA), and two tRNAs (trna-W-TCA and trna-M-CAT). A + T content was 65.39% (A: 29.27%, C: 16.59%, G: 18.03%, and T: 36.12%). ATG was the start codon in 11 PCGs: COX1< ...[more]

PMID: 36313475

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Project description:BackgroundThere are many advantages to the application of complete mitochondrial (mt) genomes in the accurate reconstruction of phylogenetic relationships in Metazoa. Although over one thousand metazoan genomes have been sequenced, the taxonomic sampling is highly biased, left with many phyla without a single representative of complete mitochondrial genome. Sipuncula (peanut worms or star worms) is a small taxon of worm-like marine organisms with an uncertain phylogenetic position. In this report, we present the mitochondrial genome sequence of Phascolosoma esculenta, the first complete mitochondrial genome of the phylum.ResultsThe mitochondrial genome of P.esculenta is 15,494 bp in length. The coding strand consists of 32.1% A, 21.5% C, 13.0% G, and 33.4% T bases (AT = 65.5%; AT skew = -0.019; GC skew = -0.248). It contains thirteen protein-coding genes (PCGs) with 3,709 codons in total, twenty-two transfer RNA genes, two ribosomal RNA genes and a non-coding AT-rich region (AT = 74.2%). All of the 37 identified genes are transcribed from the same DNA strand. Compared with the typical set of metazoan mt genomes, sipunculid lacks trnR but has an additional trnM. Maximum Likelihood and Bayesian analyses of the protein sequences show that Myzostomida, Sipuncula and Annelida (including echiurans and pogonophorans) form a monophyletic group, which supports a closer relationship between Sipuncula and Annelida than with Mollusca, Brachiopoda, and some other lophotrochozoan groups.ConclusionThis is the first report of a complete mitochondrial genome as a representative within the phylum Sipuncula. It shares many more similar features with the four known annelid and one echiuran mtDNAs. Firstly, sipunculans and annelids share quite similar gene order in the mitochondrial genome, with all 37 genes located on the same strand; secondly, phylogenetic analyses based on the concatenated protein sequences also strongly support the sipunculan + annelid clade (including echiurans and pogonophorans). Hence annelid "key-characters" including segmentation may be more labile than previously assumed.

Dataset Information

Complete mitochondrial genome sequence of Acromitus flagellatus and its phylogenetic relationship with related jellyfish species.

Publications

Complete mitochondrial genome sequence of <i>Acromitus flagellatus</i> and its phylogenetic relationship with related jellyfish species.

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