Abstract：
:Small amphipods (Halice sp. MT-2017) with body length <1 cm were collected from the Challenger Deep (~10,920 m below sea level). The divergence time of their lineage was approximately 109 Mya, making this group ancient compared to others under study. The mitochondrial genome of Halice sp. shared the usual gene components of metazoans, comprising 13 protein coding genes (PCGs), 22 transfer RNAs (tRNAs), and 2 ribosomal RNAs (rRNAs). The arrangement of these genes, however, differed greatly from that of other amphipods. Of the 15 genes that were rearranged with respect to the pancrustacean gene pattern, 12 genes (2 PCGs, 2 rRNAs, and 8 tRNAs) were both translocated and strand-reversed. In contrast, the mitochondrial genomes in other amphipods never show so many reordered genes, and in most instances, only tRNAs were involved in strand-reversion-coupled translocation. Other characteristics, including reversed strand nucleotide composition bias, relatively higher composition of non-polar amino acids, and lower evolutionary rate, were also identified. Interestingly, the latter two features were shared with another hadal amphipod, Hirondellea gigas, suggesting their possible associations with the adaptation to deep-sea extreme habitats. Overall, our data provided a useful resource for future studies on the evolutionary and adaptive mechanisms of hadal faunas.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Li JY,Zeng C,Yan GY,He LSdoi
10.1038/s41598-019-38735-zsubject
Has Abstractpub_date
2019-02-22 00:00:00pages
2610issue
1issn
2045-2322pii
10.1038/s41598-019-38735-zjournal_volume
9pub_type
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