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Ecol Evol
2018 Nov 01;822:10673-10686. doi: 10.1002/ece3.4427.
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The first complete mitochondrial genome of the Mariana Trench Freyastera benthophila (Asteroidea: Brisingida: Brisingidae) allows insights into the deep-sea adaptive evolution of Brisingida.
Mu W
,
Liu J
,
Zhang H
.
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Starfish (phylum Echinodermata) are ecologically important and diverse members of marine ecosystems in all of the world''s oceans, from the shallow water to the hadal zone. The deep sea is recognized as an extremely harsh environment on earth. In this study, we present the mitochondrial genome sequence of Mariana Trench starfish Freyastera benthophila, and this study is the first to explore in detail the mitochondrial genome of a deep-sea member of the order Brisingida. Similar to other starfish, it contained 13 protein-coding genes, two ribosomal RNA genes, and 22 transfer RNA genes (duplication of two tRNAs: trnL and trnS). Twenty-two of these genes are encoded on the positive strand, while the other 15 are encoded on the negative strand. The gene arrangement was identical to those of sequenced starfish. Phylogenetic analysis showed the deep-sea Brisingida as a sister taxon to the traditional members of the Asteriidae. Positive selection analysis indicated that five residues (8 N and 16 I in atp8, 47 D and 196 V in nad2, 599 N in nad5) were positively selected sites with high posterior probabilities. Compared these features with shallow sea starfish, we predict that variation specifically in atp8, nad2, and nad5 may play an important role in F. benthophila''s adaptation to deep-sea environment.
Figure 1. Mitochondrial gene map of Freyastera benthophila. All of 37 genes are encoded on the both strands. Genes for proteins and rRNAs are shown with standard abbreviation. Genes for tRNAs are designated by a single letter for the corresponding amino acid with two leucine tRNAs and two serine tRNAs differentiated by numerals
Figure 2. The synteny and identity level of Freyastera benthophila mitogenome against each of the other seven starfish mitogenomes. Ideograms and ribbons represent the similarity pairwise blastn searches. In F. benthophila ideogram, the 13 coding genes are colored in blue, control regions are colored in black, and rRNAs are colored in green. The figure was produced using Circoletto (Darzentas, 2010). FB (F. benthophila), AB (Acanthaster brevispinus), AP1 (Acanthaster planci), AJ (Aphelasterias japonica), AA (Asterias amurensis), AP2 (Astropecten polyacanthus), LQ (Luidia quinaria), PP (Patiria pectinifera)
Figure 3. Codon usage in Freyastera benthophila. All codons for amino acids have been classified. Each amino acid is designated by a single letter for the corresponding codon. x‐axis and y‐axis represent the used times of each codon
Figure 4. Comparison of mitochondrial gene arrangement in Echinodermata. The bars show identical gene blocks. The noncoding regions are not presented, and gene segments are not drawn to scale
Figure 5. Phylogenetic trees based on the concatenated amino acids of 13 protein‐coding genes. The branch length is determined with NJ analysis. Antedon mediterranea was used as out‐group. NJ (left number) and ML (right number) bootstrap values are given for each branch. The red dot highlights the species sequenced in this study
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