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Animal Genetics • Genet. Mol. Biol. 44 (1) • 2021 • https://doi.org/10.1590/1678-4685-GMB-2020-0166 linkcopy

Open-access The mitochondrial genome of Stereolepis doederleini (Pempheriformes: Polyprionidae) and mitogenomic phylogeny of Pempheriformes

AuthorshipSCIMAGO INSTITUTIONS RANKINGS

    Abstract

    The complete mitochondrial (mt) genome of Stereolepis doederleini was sequenced from a specimen collected in a commercial aquarium in Jeju Island. The sequence was 16,513 base pairs in length and, similar to other vertebrate mt genomes, included 37 mt genes and a noncoding control region; the gene order was identical to that of typical vertebrate mt genome. Mitochondrial genome sequences of 17 species from 12 families were used to reconstruct phylogenetic relationships within the order Pempheriformes. The phylogenetic trees were constructed with three methods (neighbor joining [NJ], maximum likelihood [ML], and Bayesian method) using 12 protein coding genes, but not ND6. In all phylogenetic trees, Pempheriformes were clustered into three strongly supported clades. Two Acropomatidae species (Synagrops japonicus in clade-Ⅰ and Doederleinia berycoides in clade-Ⅲ) were polyphyletic; S. japonicus was close to Lateolabracidae and was the sister of Glaucosomatidae + (Pempheridae/(Percophidae+Creediidae)), and D. berycoides was sister to Howellidae + Epigonidae. All phylogenetic trees supported a sister relationship between Creediidae and Percophidae in clade-Ⅰ. Glaucosomatidae formed a sister clade with Pempheridae. The relationships within clade-Ⅱ, which was composed of four families (Pentacerotidae, Polyprionidae, Banjosidae, and Bathyclupeidae), slightly differed between NJ/ML and BI tree topologies. In clade-Ⅲ, the relationships among Howellidae, Epigonidae, and Acropomatidae were strongly supported.

    Keywords
    Bayesian inference; maximum-likelihood; mitochondrion; neighbor-joining; striped jewfish

    The striped jewfish, Stereolepis doederleini Lindberg and Krasyukova, 1969, belongs to the family Polyprionidae (order Pempheriformes), which is composed of two genera and six species worldwide. The genus Stereolepis has only two species, S. doederleini and S. gigas Ayres, 1859 (FishBase ver. 12/2019). The striped jewfish, S. doederleini, a deep-water demersal fish that inhabits depths of 400-600 m, has been reported from South Korea, Japan, and Russia. In South Korea, S. doederleini is commonly called the legendary fish and is highly priced.

    The phylogeny of Pempheriformes has been controversial. Betancur-R et al. (2017) established the order Pempheriformes to include 14 families previously classified by Nelson et al. (2016) within the orders Trachiniformes and Perciformes. Thus, Betancur-R et al. (2017) transferred Champsodontidae, Creediidae, Leptoscopidae, and Percophidae from Trachiniformes and Acropomatidae, Banjosidae, Bathyclupeidae, Epigonidae, Glaucosomatidae, Howellidae, Lateolabracidae, Pempheridae, Pentacerotidae, and Polyprionidae from Perciformes. They added Hemerocoetidae, Ostracoberycidae, and Symphysanodontidae to their new order Pempheriformes. Betancur-R et al. (2017) placed Dinolestidae and Scombropidae, two families previously treated within Perciformes by Nelson et al. (2016), within their Eupercaria (incertae sedis) and Scombriformes, respectively. Ghedotti et al. (2018) proposed the transfer of Dinolestidae, Scombropidae, and all the families in Pempheriformes sensuBetancur-R et al. (2017), excluding Percophidae, to Acropomatiformes and further expanded the order to include two new families, Malakichthyidae and Synagropidae.

    Here, we sequenced the complete mitochondrial (mt) genome of the striped jewfish, S. doederleini, which, to the best of our knowledge, is the first time an mt genome has been sequence for a fish in the family Polyprionidae. We also conducted phylogenetic analysis to examine relationships within the Pempheriformes.

    The genomic DNA was extracted using a NucleoSpin Tissue kit (Macherey-Nagel, Germany) from fin tissue of S. doederleini obtained from a commercial aquarium in Jeju Island. The complete mt genome was amplified using eight pairs of degenerate primers, and several internal primers were used for primer walking sequencing. The complete mt genome was annotated using the web-based tool MITOS (Bernt et al., 2013), followed by manual validation of the coding regions, using the NCBI ORF Finder, and by comparison with other known mt genomes of Pempheriformes. Graphical genome maps were generated using the SnapGene 5 software.

    To reconstruct phylogenetic relationships within the order, we downloaded 16 complete mt genome sequences of Pempheriformes from the GenBank database (Table 1) and used sequences of 12 protein-coding genes (PCGs); sequences of NADH dehydrogenase subunit 6 gene were not included in the analysis because of their heterogeneous base composition and consistently poor phylogenetic performance (Zardoya and Meyer, 1996; Miya and Nishida, 2000). The MEGA X software (Kumar et al., 2018), for sequence alignment, neighbor joining (NJ), and maximum likelihood (ML), and MrBayes 3.2 software (Ronquist et al. 2012), for Bayesian inference (BI), were used for phylogenetic tree reconstruction. GTR+G+I model was selected as the best evolutionary model for ML and BI by jmodeltest2 (Darriba et al., 2012). Bootstrap analysis (1,000 replicates) was conducted for ML tree reconstruction and four Markov chains for BI were run for 3,000,000 generations and sampled every 100 generations to obtain a posterior probability (PP) distribution of 1,000 trees. Macquaria ambigua (Centrarchiformes, Percichthyidae) was used as an outgroup.

    Thumbnail
    Table 1 -
    List of species used for phylogenetic analysis.

    The complete mt genome of S. doederleini was 16,513 bp long (GenBank accession number MT083886) and showed general features (13 PCGs, 22 tRNAs, 2 rRNAs, and control region) and gene order typical for bony fishes (Figure 1).

    thumbnail of Figure 1 -
    Figure 1 -
    Mitochondrial genome of Stereolepis doederleini. The genes and their order was identical to those of other bony fishes.

    Similar to other bony fishes, ATG is the start codon of all PCGs in the S. doederleini mt genome, with the exception of cytochrome c oxidase subunit I (COI), in which ATG is replaced with GTG (Oh and Jung, 2008; Zhong et al., 2018). ATG is the most common initiation codon for 13 PCGs in sequenced vertebrate mt genomes, although there are exceptions in which the start codons were ATA, ATC, ATT, GTG, and GTT (Miya and Nishida, 1999; Miya et al., 2003). Most PCGs of S. doederleini mt genome ended with TAA, except for COII and cytochrome b (incomplete T), and NADH dehydrogenase subunit 4 (AGA). The alternative codon and incomplete termination is often found in various bony fishes (Miya et al., 2003; Zhong et al., 2018; Li et al., 2019).

    The tree topologies obtained by NJ, ML, and BI were congruent in resolving three clades within Pempheriformes (Figure 2). Clade-I comprised Creediidae, Percophidae, Pempheridae, Glaucosomatidae, Acropomatidae-I, and Lateolabracidae; Clade-II was composed of Pentacerotidae, Polyprionidae, Banjosidae, and Bathyclupeidae; and Clade-III included Howellidae, Epigonidae, and Acropomatidae-II. Acropomatidae was polyphyletic (S. japonicus was placed within Clade-I and D. berycoides within Clade-III) and Pseudopentaceros in Clade-II was paraphyletic (Pentaceros was within the clade with the two Pseudopentaceros species). Acropomatidae-I was closely related to Lateolabracidae and Glaucosomatidae, and Acropomatidae-II was sister to Howellidae + Epigonidae.

    thumbnail of Figure 2 -
    Figure 2 -
    Phylogeny of Pempheriformes using 12 protein-coding genes (excluding ND6) of the mitochondrial genome. (A) Neighbor-joining (NJ), maximum likelihood (ML), and (B) Bayesian inference (BI) showed that the values on the nodes represent bootstrap support and posterior probability (100% and 1.0 support value is shown as a black circle on each node, respectively). Macquaria ambigua (Centrarchiformes, Percichthyidae) was used as an outgroup.

    Although NJ and ML tree suggested that a common ancestor diverged into Polyprionidae and Pentacerotidae with low support (Figure 2A), the branch of S. doederleini was diverged earlier than Banjosidae and Pentacerotidae with strongly support in BI (Figure 2B).

    The phylogenetic analysis resolved Acropomatidae polyphyletic and Pseudopentaceros paraphyletic (Sanciangco et al., 2016; Niu et al., 2018). Synagrops (Acropomatidae) is currently considered an unnatural group characterized by several anatomical traits such as the absence of pelvic-fin spine serrations (Schwarzhans and Prokofiev, 2017). Therefore, the taxonomy of Acropomatidae, including that of D. berycoides, as well as that of Pentaceros and Pseudopentaceros should be revised to reflect the phylogenetic status of the groups. Percophidae had been classified within Perciformes (Van Der Laan et al., 2014; Mirande, 2017). However, our data and other studies placed Percophidae within Pempheriformes (Sanciangco et al., 2016; Satoh, 2018).

    Among the NJ, ML, and BI trees, the topology of the BI tree was most similar to that reported by Betancur-R et al. (2017), although the phylogenetic relationships indicated in these two trees were slightly different (Figure 3). Betancur-R et al. (2017) suggested that Acropomatidae was close to Lateolabracidae in Clade-I, and that Acropomatidae was close to Howellidae/Ostracoberycidae in Clade-III. However, the BI tree constructed in the present study indicated that Acropomatidae-I was not directly grouped with Lateolabracidae in Clade-I, whereas we found that Epigonidae was grouped with Howellidae in Clade-III. Although the support for Pempheriformes was low due to a lack of morphological synapomorphies (Betancur-R et al., 2017), our molecular data strongly supported most of phylogenetic relationships among Pempheriformes reported by Betancur-R et al. (2017; Figure 3).

    thumbnail of Figure 3 -
    Figure 3 -
    Comparison of the topologies of the present and previous classifications. (Left) Edited topology of the classification presented by Betancur-R et al. (2017). (Right) Topology of the BI tree constructed in the present study. Bold lines indicate the highly reliable branches (support value > 50% in left and support value > 90% in right).

    In this study, we included sequences of 12 of the 20 families in the order Pempheriformes. For a complete resolution of the phylogenetic relationships between families within Pempheriformes, future phylogenetic studies should include representatives of the remaining eight families.

    Acknowledgement

    Thanks to aquarist Mr. Cho and staff members of ‘Hanwha Aqua Planet Jeju’ for providing the fish sample.

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    Internet Resources

    • Associate Editor
      Rogerio Margis

    Publication Dates

    • Publication in this collection
      03 Mar 2021
    • Date of issue
      2021

    History

    • Received
      28 May 2020
    • Accepted
      19 Jan 2021
    Creative Common - by 4.0
    This is an open-access article distributed under the terms of the Creative Commons Attribution License
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