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. 2021 Aug 31;6(10):2812-2815.
doi: 10.1080/23802359.2021.1970635. eCollection 2021.

The complete mitochondrial genome of Mactra chinensis (Bivalvia: Macridae)

Hongtao Nie  1 , Yuri Ph Kartavtsev  2
Affiliations

The complete mitochondrial genome of Mactra chinensis (Bivalvia: Macridae)

Hongtao Nie et al. Mitochondrial DNA B Resour. .

Abstract

The structure and composition of the mitogenome of a bivalve mollusk, denoted as Mactra sp. (MT780813), has been obtained. The genome has a variable organization: it includes 12 protein-coding genes, 28 tRNAs, and two rRNA genes. Its content is sufficiently different from that of nearest specimen, accessed from GenBank, supposedly belonging to the other gender. All genes are encoded on the "+"-strand. All protein-coding genes are initiated with ATG codon. Analysis confirms the close topological position of the GenBank Mactra chinensis (KJ754823) and our M. sp. specimen on gene tree. Above data suggesting female- vs. male-type mitogenomes or cryptic species presence.

Keywords: Mactra; Mitogenome; bivalve mollusk; phylogenetic analysis; structure.

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Conflict of interest statement

The authors have no conflicts of interest to declare. The authors are solely responsible for the content and the writing of this paper.

Figures

Figure 1.
Figure 1.
The organization of Mactra sp. MT780813 (Mactridae) mitochondrial genome and the position of the specimen on the gene tree with the nearest relatives. (A) All genes are encoded on the same strand (+). The transfer RNA genes are designated by three-letter amino acid codes. The rRNA subunits, 12S rRNA and 16S rRNA, are shown in this annotation as rRNA-S (rrnS, within a circle) and rRNA-L (rrnL, within a circle), respectively. (B) Original NJ gene tree demonstrating the relationships among the nearest relatives of Mactra sp. (MT780813 sequence), built on the basis of 12 PCGs sequences (no ATP8 identified in our sequence, as implemented in Figure 1(A) and in Supplement) of seven mitochondrial genomes. Numerals at the nodes indicate support values for tree topology based on 1000 replicates of the bootstrap test. Numerals below the branches indicate the composition bias calculated for seven sequences in the analysis. Congruent tree topology was obtained for NJ, ML, and MP-tree reconstructions (not shown).
See this image and copyright information in PMC

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