Complete mitochondrial genome sequence of the Arctic gammarid,Onisimus nanseni (Crustacea; Amphipoda): Novel gene structures and unusual control region features |
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Authors: | Jang-Seu Ki Haakon Hop Se-Joo Kim Il-Chan Kim Heum Gi Park Jae-Seong Lee |
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Affiliation: | 1. Department of Medical Parasitology, Wannan Medical College, Wuhu 241002, Anhui, China;2. School of Medicine, Anhui University of Science & Technology, Huainan 232001, Anhui, China;1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Innovation Academy of Seed Design, Chinese Academy of Sciences, Wuhan 430072, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China |
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Abstract: | To analyze the mitogenome of the amphipod Onisimus nanseni, we amplified the complete mitogenome of O. nanseni using long-PCR and genome walking techniques. The mitogenome of O. nanseni is circular and contains all the typical mt genes (2 rRNAs, 22 tRNAs, and 13 protein-coding genes). It has two peculiar non-coding regions of 148 bp and 194 bp. The latter can be involved in replication and termination processes. The total length of the pooled protein-coding, rRNA, and tRNA genes is shorter than those of other crustaceans. In addition, the intergenic spacers of the O. nanseni mitogenome are considerably shorter in length than those of other crustaceans. Fourteen adjacent genes overlap, resulting in a compact mitogenomic structure. In the O. nanseni mitogenome, the AT composition is elevated, particularly in the control regions (78.9% AT), as has been demonstrated for two other amphipods. The tRNA order is highly rearranged compared to other arthropod mitogenomes, but the order of protein-coding genes and rRNAs is largely conserved. The gene cluster between the CO1 and CO3 genes is completely conserved among all amphipods compared. This provides insights into the evolution and gene structures of crustacean mitochondrial genomes, particularly in amphipods. |
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