Characterization of the mitochondrial genome of an ancient amphipod Halice sp. MT-2017 (Pardaliscidae) from 10,908 m in the Mariana Trench

Scientific Reports
Jun-Yuan LiLi-Sheng He

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 habita...Continue Reading

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Citations

Feb 12, 2021·Genome Biology and Evolution·Chiara PapettiEnrico Negrisolo
Mar 7, 2021·International Journal of Molecular Sciences·Kai ZhangPei-Yuan Qian
May 22, 2021·Biological Trace Element Research·Lingyue ZhuQianghua Xu

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Datasets Mentioned

BETA
MH294484

Methods Mentioned

BETA
electrophoresis
PCR

Software Mentioned

DNAMAN
Trimmomatic
Bowtie2
Gblocks
BEAST
BLAST
TreeAnnotator
Mega
ProtTest
Sequence Manipulation Suite

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