Molecular phylogenetic relationships based on mitochondrial genomes of novel deep-sea corals (Octocorallia: Alcyonacea): Insights into slow evolution and adaptation to extreme deep-sea environments
文献类型： 外文期刊
作者： Wei, Zhan-Fei 1 ; Ta, Kai-Wen 3 ; Zhang, Nan-Nan 2 ; Liu, Shan-Shan 2 ; Meng, Liang 2 ; Liu, Kai-Qiang 1 ; Cai, Chong-Yang 2 ; Peng, Xiao-Tong 3 ; Shao, Chang-Wei 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Natl Key Lab Mariculture Biobreeding & Sustainable, Qingdao 266071, Shandong, Peoples R China
2.BGI Shenzhen, BGI Qingdao, Qingdao 266555, Shandong, Peoples R China
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Hainan, Peoples R China
关键词： Mitochondrial genome; Alcyonacea; Ka/Ks evolution; Environmental factors
期刊名称：ZOOLOGICAL RESEARCH （ 影响因子：4.9； 五年影响因子：4.6 ）
ISSN： 2095-8137
年卷期： 2024 年 45 卷 1 期
页码：
收录情况： SCI
摘要： A total of 10 specimens of Alcyonacea corals were collected at depths ranging from 905 m to 1 633 m by the manned submersible Shenhai Yongshi during two cruises in the South China Sea (SCS). Based on mitochondrial genomic characteristics, morphological examination, and sclerite scanning electron microscopy, the samples were categorized into four suborders (Calcaxonia, Holaxonia, Scleraxonia, and Stolonifera), and identified as 9 possible new cold-water coral species. Assessments of GC-skew dissimilarity, phylogenetic distance, and average nucleotide identity (ANI) revealed a slow evolutionary rate for the octocoral mitochondrial sequences. The nonsynonymous (Ka) to synonymous (Ks) substitution ratio (Ka/Ks) suggested that the 14 protein-coding genes (PCGs) were under purifying selection, likely due to specific deep-sea environmental pressures. Correlation analysis of the median Ka/Ks values of five gene families and environmental factors indicated that the genes encoding cytochrome b (cyt b) and DNA mismatch repair protein (mutS) may be influenced by environmental factors in the context of deep-sea species formation. This study highlights the slow evolutionary pace and adaptive mechanisms of deep-sea corals.
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