Phylogenomic analysis reveals a two-stage process of the evolutionary transition ofShewanellafrom the upper ocean to the hadal zone
Phylogenomic analysis reveals a two-stage process of the evolutionary transition ofShewanellafrom the upper ocean to the hadal zone
复制标题
系统发育分析揭示了希瓦氏菌从上层海洋向深渊带进化过渡的两个阶段过程
DOI：
10.1111/1462-2920.15162
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发表时间：
2020
影响因子：
5.1
通讯作者：
Xiao Xiang
中科院分区：
文献类型：
--
作者：
Tang Xixiang;Yu Libo;Yi Yi;Wang Jiahua;Wang Siyuan;Meng Canxing;Liu Shunzhang;Hao Yali;Zhang Yue;Cao Xiaorong;Jian Huahua;Xiao Xiang
希瓦氏菌属菌株的特点是具有多种代谢能力，因此它们广泛分布于海洋的不同深度。考虑到颗粒沉积是海洋中一个重要的动力学过程，我们假设hadalShewanellaspecies从上层海洋进化而来。在这项研究中，我们从西南印度洋的深海沉积物中分离出三种新的希瓦氏菌株。基因组测序结果表明，菌株YLB-06和YLB-08代表希瓦氏菌属中的两个新种。通过对海洋希瓦氏藻的基因组分析，我们发现海洋希瓦氏藻的物种形成和基因组变化与水深有关。通过比较基因组学和基因获得/丢失分析，进一步证实了上述假说，揭示了希瓦氏藻从大洋上层向超深渊带演化的两阶段过程。最后，转录组学分析表明，最近获得的基因被严格抑制，因此可能在对环境变化的反应中发挥次要作用。
Shewanellastrains are characterized by versatile metabolic capabilities, resulting in their wide distribution in the ocean at different depths. Considering that particle sedimentation is an important dynamic process in the ocean, we hypothesized that hadalShewanellaspecies evolved from the upper ocean. In this study, we isolated three novelShewanellastrains from deep‐sea sediments in the Southwest Indian Ocean. Genome sequencing indicated that strains YLB‐06 and YLB‐08 represent two novel species in the genusShewanella. Through phylogenomic analysis, we showed that speciation and genomic changes in marineShewanellastrains are related to water depth. We further confirmed the aforementioned hypothesis and revealed a two‐stage process of the evolutionary transition ofShewanellafrom the upper ocean to the hadal zone by comparative genomics and gene gain/loss analysis. Finally, the transcriptomic analysis demonstrated that recently obtained genes are strictly repressed and may thus play a minor role in the response to environmental changes.