Du Yanzhen, Han Kangkang, Zeng Xiaoqi, Ni Gang
Ministry of Education Key Laboratory of Mariculture, Ocean University of China, Qingdao, China.
Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, China.
Mitochondrial DNA A DNA Mapp Seq Anal. 2021 Jul-Dec;32(5-8):212-219. Epub 2023 Nov 28.
The starfish is a marine pest native to the northwestern Pacific and has successfully invaded southern Australia. have caused substantial environmental and economic impacts in both native and non-native regions. However, little information is available about the genetic features of its native populations, especially for those in North China. Here we sequenced the complete mitochondrial genomes of five individuals from different locations in China and compared their characteristics with three mitogenomes available from Japan. Multiple analyses and comparisons revealed little difference in the gene composition, gene order, codon usage, and nucleotide content among the eight mitogenomes. However, intraspecific phylogenetic reconstruction unveiled two divergent lineages between specimens from North China plus Ushimado (Seto Inland Sea, Japan) and northern Japan (Asamushi and Onagawa). This conclusion was backed by an analysis of pairwise genetic distances, which showed that individuals from different lineages had relatively higher values (all above 2%). Based on knowledge of paleoenvironmental and tectonic activity in the northwestern Pacific, the two lineages might have originated during the Early Pliocene due to the isolation of the East China Sea from the Japan Sea/East Sea during that time, while the present-day distribution of these lineages have likely been influenced by the ocean current system.
海星是一种原产于西北太平洋的海洋有害生物，已成功入侵澳大利亚南部。它在原生地和非原生地都造成了重大的环境和经济影响。然而，关于其原生种群的遗传特征，尤其是中国北方种群的遗传特征，目前所知甚少。在此，我们对来自中国不同地点的5个个体的线粒体基因组进行了测序，并将其特征与来自日本的3个线粒体基因组进行了比较。多重分析和比较显示，这8个线粒体基因组在基因组成、基因顺序、密码子使用和核苷酸含量方面差异不大。然而，种内系统发育重建揭示了来自中国北方加日本宇治万（濑户内海）的标本与日本北部（浅虫和女川）的标本之间存在两个不同的谱系。这一结论得到了成对遗传距离分析的支持，该分析表明来自不同谱系的个体具有相对较高的值（均高于2%）。基于对西北太平洋古环境和构造活动的了解，这两个谱系可能起源于上新世早期，当时东海与日本海/东海隔离，而这些谱系目前的分布可能受到洋流系统的影响。
