Dataset Information

First report of the mitochondrial DNA sequences of the giant clam, Tridacna gigas (Tridacnidae Tridacna).

ABSTRACT: In this study, we present the first complete mitochondrial genome sequence of the giant clam Tridacna gigas. The total length of the mitogenome is 19,558 bp. It contains the typical mitochondrial genomic structure, including 13 protein-coding genes, 23 transfer RNA genes, two ribosomal RNA genes, and one control region (D-loop). Mitogenome base composition is biased toward A + T content, at 57.6%. A phylogenetic tree based on complete mitogenome sequences revealed that, within the genus Tridacna, T. gigas is closely related to T. derasa.

SUBMITTER: Ma H

PROVIDER: S-EPMC7594740 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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First report of the mitochondrial DNA sequences of the giant clam, <i>Tridacna gigas</i> (Tridacnidae Tridacna).

Ma Haitao H Xiang Zhiming Z Zhang Yang Y Li Jun J Qin Yanping Y Zhang Yuehuan Y Yu Ziniu Z

Mitochondrial DNA. Part B, Resources 20201023 3

In this study, we present the first complete mitochondrial genome sequence of the giant clam <i>Tridacna gigas</i>. The total length of the mitogenome is 19,558 bp. It contains the typical mitochondrial genomic structure, including 13 protein-coding genes, 23 transfer RNA genes, two ribosomal RNA genes, and one control region (D-loop). Mitogenome base composition is biased toward A + T content, at 57.6%. A phylogenetic tree based on complete mitogenome sequences revealed that, within the genus < ...[more]

PMID: 33367031

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Project description:BackgroundGiant clams and scleractinian (reef-building) corals are keystone species of coral reef ecosystems. The basis of their ecological success is a complex and fine-tuned symbiotic relationship with microbes. While the effect of environmental change on the composition of the coral microbiome has been heavily studied, we know very little about the composition and sensitivity of the microbiome associated with clams. Here, we explore the influence of increasing temperature on the microbial community (bacteria and dinoflagellates from the family Symbiodiniaceae) harbored by giant clams, maintained either in isolation or exposed to other reef species. We created artificial benthic assemblages using two coral species (Pocillopora damicornis and Acropora cytherea) and one giant clam species (Tridacna maxima) and studied the microbial community in the latter using metagenomics.ResultsOur results led to three major conclusions. First, the health status of giant clams depended on the composition of the benthic species assemblages. Second, we discovered distinct microbiotypes in the studied T. maxima population, one of which was disproportionately dominated by Vibrionaceae and directly linked to clam mortality. Third, neither the increase in water temperature nor the composition of the benthic assemblage had a significant effect on the composition of the Symbiodiniaceae and bacterial communities of T. maxima.ConclusionsAltogether, our results suggest that at least three microbiotypes naturally exist in the studied clam populations, regardless of water temperature. These microbiotypes plausibly provide similar functions to the clam host via alternate molecular pathways as well as microbiotype-specific functions. This redundancy in functions among microbiotypes together with their specificities provides hope that giant clam populations can tolerate some levels of environmental variation such as increased temperature. Importantly, the composition of the benthic assemblage could make clams susceptible to infections by Vibrionaceae, especially when water temperature increases. Video abstract.

Dataset Information

First report of the mitochondrial DNA sequences of the giant clam, Tridacna gigas (Tridacnidae Tridacna).

Publications

First report of the mitochondrial DNA sequences of the giant clam, <i>Tridacna gigas</i> (Tridacnidae Tridacna).

Similar Datasets

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