Dataset Information

Complete mitochondrial genome of the mangrove killifish Kryptolebias hermaphroditus (Cyprinodontiformes, Rivulidae).

ABSTRACT: The complete mitochondrial genome was sequenced from the mangrove killifish (Kryptolebias hermaphroditus). The genome sequence was 17,487?bp in size, and the gene order and contents were identical with those of the congeneric species (K. marmoratus) in the genus Kryptolebias with emphasis on the second control region (795?bp). Of 13 protein-coding genes (PGCs), 5 genes (ND2, CO2, CO3, ND3, and Cytb) had incomplete stop codons as shown in K. marmoratus. Furthermore, the stop codon of ND6 gene was AGG, while the start codon of CO1 gene was GTG. The base composition of K. hermaphroditus mitogenome showed an anti-G bias (13.45% and 8.19%) on the second and third position of the protein-coding genes (PCGs), respectively.

SUBMITTER: Kim HS

PROVIDER: S-EPMC7800439 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature

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Complete mitochondrial genome of the mangrove killifish Kryptolebias hermaphroditus (Cyprinodontiformes, Rivulidae).

Kim Hui-Su HS Hwang Dae-Sik DS Hagiwara Atsushi A Sakakura Yoshitaka Y Lee Jae-Seong JS

Mitochondrial DNA. Part B, Resources 20160723 1

The complete mitochondrial genome was sequenced from the mangrove killifish (Kryptolebias hermaphroditus). The genome sequence was 17,487 bp in size, and the gene order and contents were identical with those of the congeneric species (K. marmoratus) in the genus Kryptolebias with emphasis on the second control region (795 bp). Of 13 protein-coding genes (PGCs), 5 genes (ND2, CO2, CO3, ND3, and Cytb) had incomplete stop codons as shown in <i ...[more]

PMID: 33473549

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Project description:BACKGROUND:Among teleosts, the South American genus Austrolebias (Cyprinodontiformes: Rivulidae) includes 42 taxa of annual fishes divided into five different species groups. It is a monophyletic genus, but morphological and molecular data do not resolve the relationship among intrageneric clades and high rates of substitution have been previously described in some mitochondrial genes. In this work, the complete mitogenome of a species of the genus was determined for the first time. We determined its structure, gene order and evolutionary peculiar features, which will allow us to evaluate the performance of mitochondrial genes in the phylogenetic resolution at different taxonomic levels. RESULTS:Regarding gene content and order, the circular mitogenome of A. charrua (17,271 pb) presents the typical pattern of vertebrate mitogenomes. It contains the full complement of 13 proteins-coding genes, 22 tRNA, 2 rRNA and one non-coding control region. Notably, the tRNA-Cys was only 57 bp in length and lacks the D-loop arm. In three full sibling individuals, heteroplasmatic condition was detected due to a total of 12 variable sites in seven protein-coding genes. Among cyprinodontiforms, the mitogenome of A. charrua exhibits the lowest G+C content (37 %) and GCskew, as well as the highest strand asymmetry with a net difference of T over A at 1st and 3rd codon positions. Considering the 12 coding-genes of the H strand, correspondence analyses of nucleotide composition and codon usage show that A and T at 1st and 3rd codon positions have the highest weight in the first axis, and segregate annual species from the other cyprinodontiforms analyzed. Given the annual life-style, their mitogenomes could be under different selective pressures. All 13 protein-coding genes are under strong purifying selection and we did not find any significant evidence of nucleotide sites showing episodic selection (dN >dS) at annual lineages. When fast evolving third codon positions were removed from alignments, the "supergene" tree recovers our reference species phylogeny as well as the Cytb, ND4L and ND6 genes. Therefore, third codon positions seem to be saturated in the aforementioned coding regions at intergeneric Cyprinodontiformes comparisons. CONCLUSIONS:The complete mitogenome obtained in present work, offers relevant data for further comparative studies on molecular phylogeny and systematics of this taxonomic controversial endemic genus of annual fishes.

Dataset Information

Complete mitochondrial genome of the mangrove killifish Kryptolebias hermaphroditus (Cyprinodontiformes, Rivulidae).

Publications

Complete mitochondrial genome of the mangrove killifish <i>Kryptolebias hermaphroditus</i> (Cyprinodontiformes, Rivulidae).

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