Dataset Information

The complete mitochondrial genome of sponge Halichondria (Halichondria) sp. (Demospongiae, Suberitida, Halichondriidae).

ABSTRACT: In this study, we found out the complete mitochondrial genome of Halichondria (Halichondria) sp., a common demosponge in China. This is the first complete mitochondrial report on the genus Halichondria. The mitochondrial genome of Halichondria (Halichondria) sp. is 20 746?bp in length, with 14 protein-coding genes, two rRNA genes and 25 tRNA genes. When compared with the complete mitochondrial genome of Hymeniacidon sinapium, our phylogenetic result suggested that Halichondria (Halichondria) sp. converged well according to morphological result.

SUBMITTER: Wang D

PROVIDER: S-EPMC7800652 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature

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The complete mitochondrial genome of sponge Halichondria (Halichondria) sp. (Demospongiae, Suberitida, Halichondriidae).

Wang Dexiang D Zhang Yuan Y Huang Dan D

Mitochondrial DNA. Part B, Resources 20160712 1

In this study, we found out the complete mitochondrial genome of Halichondria (Halichondria) sp., a common demosponge in China. This is the first complete mitochondrial report on the genus Halichondria. The mitochondrial genome of Halichondria (Halichondria) sp. is 20 746 bp in length, with 14 protein-coding genes, two rRNA genes and 25 tRNA genes. When compared with the complete mitochondrial genome of Hymeniacidon sinapium, our phylogenetic result sugg ...[more]

PMID: 33473538

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Project description:Two major transitions in animal evolution--the origins of multicellularity and bilaterality--correlate with major changes in mitochondrial DNA (mtDNA) organization. Demosponges, the largest class in the phylum Porifera, underwent only the first of these transitions and their mitochondrial genomes display a peculiar combination of ancestral and animal-specific features. To get an insight into the evolution of mitochondrial genomes within the Demospongiae, we determined 17 new mtDNA sequences from this group and analyzing them with five previously published sequences. Our analysis revealed that all demosponge mtDNAs are 16- to 25-kbp circular molecules, containing 13-15 protein genes, 2 rRNA genes, and 2-27 tRNA genes. All but four pairs of sampled genomes had unique gene orders, with the number of shared gene boundaries ranging from 1 to 41. Although most demosponge species displayed low rates of mitochondrial sequence evolution, a significant acceleration in evolutionary rates occurred in the G1 group (orders Dendroceratida, Dictyoceratida, and Verticillitida). Large variation in mtDNA organization was also observed within the G0 group (order Homosclerophorida) including gene rearrangements, loss of tRNA genes, and the presence of two introns in Plakortis angulospiculatus. While introns are rare in modern-day demosponge mtDNA, we inferred that at least one intron was present in cox1 of the common ancestor of all demosponges. Our study uncovered an extensive mitochondrial genomic diversity within the Demospongiae. Although all sampled mitochondrial genomes retained some ancestral features, including a minimally modified genetic code, conserved structures of tRNA genes, and presence of multiple non-coding regions, they vary considerably in their size, gene content, gene order, and the rates of sequence evolution. Some of the changes in demosponge mtDNA, such as the loss of tRNA genes and the appearance of hairpin-containing repetitive elements, occurred in parallel in several lineages and suggest general trends in demosponge mtDNA evolution.

Dataset Information

The complete mitochondrial genome of sponge Halichondria (Halichondria) sp. (Demospongiae, Suberitida, Halichondriidae).

Publications

The complete mitochondrial genome of sponge <i>Halichondria</i> (<i>Halichondria</i>) sp. (Demospongiae, Suberitida, Halichondriidae).

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