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Complete mitogenomes reveal high diversity and recent population dynamics in Antarctic krill

文献类型： 外文期刊

作者： Sun, Shuai 1 ; Li, Shuo 4 ; Seim, Inge 6 ; Du, Xiao 2 ; Yang, Xianwei 2 ; Liu, Kaiqiang 4 ; Wei, Zhanfei 4 ; Shao, Changwei 4 ; Fan, Guangyi 2 ; Liu, Xin 1 ;

作者机构： 1.Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China

2.BGI Res, Qingdao 266555, Peoples R China

3.BGI Res, Shenzhen Key Lab Marine Biol Genom, Shenzhen 518083, Peoples R China

4.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, State Key Lab Mariculture Biobreeding & Sustainabl, Qingdao 266071, Shandong, Peoples R China

5.Qingdao Marine Sci & Technol Ctr, Lab Marine Fisheries Sci & Food Prod Proc, Qingdao 266237, Shandong, Peoples R China

6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China

7.BGI Res, State Key Lab Genome & Multiom Technol, Shenzhen 518083, Peoples R China

8.BGI Res, China Natl GeneBank, Shenzhen 518120, Peoples R China

关键词： Antarctic krill; Mitochondrial genome; Genetic diversity; Population dynamics; Natural selection

期刊名称：BMC GENOMICS （ 影响因子：3.7； 五年影响因子：4.2 ）

ISSN： 1471-2164

年卷期： 2025 年 26 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundThe Antarctic krill (Euphausia superba) is a keystone species in the Southern Ocean ecosystem, influencing food web dynamics and ecosystem functionality. Despite its ecological importance, further exploration is essential to understand their population dynamics.ResultsIn this study, we present the complete mitogenome of the Antarctic krill. The assembly is 18,926 bp, including a notably large 3,952 bp control region (CR). The CR features a satellite repeat spanning 2,289 bp, showcasing the effectiveness of long-read sequencing in resolving complex genomic regions. Additionally, we identified 900 nuclear-mitochondrial segments (NUMTs) totaling 2.79 Mb, shedding light on the dynamic integration of mitochondrial DNA (mtDNA) into the nuclear genomes. By establishing a dataset comprising 80 krill mitogenomes, we unveil substantial mitochondrial diversity, particularly within the ND4 gene. While our analysis reveals no significant differentiation among four geographically distinct groups, we identify at least four maternal genetic clusters. Haplotype network analysis and demographic reconstructions suggest a recent population expansion, likely driven by favorable environmental conditions during the late Pleistocene. Furthermore, our investigation into selection pressures on mitochondrial genes reveals evidence of purifying selection across all 13 protein-coding genes, underscoring the pivotal role of mtDNA conservation in maintaining mitochondrial function under extreme environments.ConclusionsThis study provides a repository of Antarctic krill mitogenomes and insights into the population genetics and evolutionary history of this ecologically important species from a mitogenomic perspective, with implications for krill conservation and management in the Southern Ocean.

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