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Phylogenomic analysis reveals a two‐stage process of the evolutionary transition of Shewanella from the upper ocean to the hadal zone
Author(s) -
Tang Xixiang,
Yu Libo,
Yi Yi,
Wang Jiahua,
Wang Siyuan,
Meng Canxing,
Liu Shunzhang,
Hao Yali,
Zhang Yue,
Cao Xiaorong,
Jian Huahua,
Xiao Xiang
Publication year - 2021
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.15162
Subject(s) - shewanella , biology , evolutionary biology , genome , gene , genetics , ecology , bacteria
Summary Shewanella strains 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 hadal Shewanella species evolved from the upper ocean. In this study, we isolated three novel Shewanella strains 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 genus Shewanella . Through phylogenomic analysis, we showed that speciation and genomic changes in marine Shewanella strains are related to water depth. We further confirmed the aforementioned hypothesis and revealed a two‐stage process of the evolutionary transition of Shewanella from 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.