Phylogenomic analysis reveals a two-stage process of the evolutionary transition of Shewanella from the upper ocean to the hadal zone.

Xixiang Tang, Libo Yu, Yi Yi, Jiahua Wang, Siyuan Wang, Canxing Meng, Shunzhang Liu, Yali Hao, Yue Zhang, Xiaorong Cao, Huahua Jian, Xiang Xiao

Environmental microbiology 2021 Feb

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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. © 2020 Society for Applied Microbiology and John Wiley & Sons Ltd.

Citation

Xixiang Tang, Libo Yu, Yi Yi, Jiahua Wang, Siyuan Wang, Canxing Meng, Shunzhang Liu, Yali Hao, Yue Zhang, Xiaorong Cao, Huahua Jian, Xiang Xiao. Phylogenomic analysis reveals a two-stage process of the evolutionary transition of Shewanella from the upper ocean to the hadal zone. Environmental microbiology. 2021 Feb;23(2):744-756