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Metagenomic insights into the metabolism and ecologic functions of the widespread DPANN archaea from deep-sea hydrothermal vents

Ruining Cai, Jing Zhang, Rui Liu, Chaomin Sun
doi: https://doi.org/10.1101/2020.02.12.946848
Ruining Cai
1Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
2Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
3College of earth science, University of Chinese Academy of Sciences, Beijing, China
4Center of Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China
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Jing Zhang
1Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
2Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
3College of earth science, University of Chinese Academy of Sciences, Beijing, China
4Center of Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China
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Rui Liu
1Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
2Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
4Center of Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China
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Chaomin Sun
1Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
2Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
4Center of Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China
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  • For correspondence: sunchaomin@qdio.ac.cn
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ABSTRACT

Due to the particularity of metabolism and the importance of ecological roles, the archaea living in deep-sea hydrothermal system always attract great attention. Included, the DPANN superphylum archaea, which are massive radiation of organisms, distribute widely in hydrothermal environment, but their metabolism and ecology remain largely unknown. In this study, we assembled 20 DPANN genomes comprised in 43 reconstructed genomes from deep-sea hydrothermal sediments, presenting high abundance in the archaea kingdom. Phylogenetic analysis shows 6 phyla comprising Aenigmarchaeota, Diapherotrites, Nanoarchaeota, Pacearchaeota, Woesearchaeota and a new candidate phylum designated DPANN-HV-2 are included in the 20 DPANN archaeal members, indicating their wide diversity in this extreme environment. Metabolic analysis presents their metabolic deficiencies because of their reduced genome size, such as gluconeogenesis, de novo nucleotide and amino acid synthesis. However, they possess alternative and economical strategies to fill this gap. Furthermore, they were detected to have multiple capacities of assimilating carbon dioxide, nitrogen and sulfur compounds, suggesting their potentially important ecologic roles in the hydrothermal system.

IMPORTANCE DPANN archaea show high distribution in the hydrothermal system. However, they possess small genome size and some incomplete biological process. Exploring their metabolism is helpful to know how such small lives adapt to this special environment and what ecological roles they play. It was ever rarely noticed and reported. Therefore, in this study, we provide some genomic information about that and find their various abilities and potential ecological roles. Understanding their lifestyles is helpful for further cultivating, exploring deep-sea dark matters and revealing microbial biogeochemical cycles in this extreme environment.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted February 13, 2020.
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Metagenomic insights into the metabolism and ecologic functions of the widespread DPANN archaea from deep-sea hydrothermal vents
Ruining Cai, Jing Zhang, Rui Liu, Chaomin Sun
bioRxiv 2020.02.12.946848; doi: https://doi.org/10.1101/2020.02.12.946848
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Metagenomic insights into the metabolism and ecologic functions of the widespread DPANN archaea from deep-sea hydrothermal vents
Ruining Cai, Jing Zhang, Rui Liu, Chaomin Sun
bioRxiv 2020.02.12.946848; doi: https://doi.org/10.1101/2020.02.12.946848

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