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Novel and unexpected genetic and microbial diversity for arsenic cycling in deep sea cold seep sediments

Chuwen Zhang, Xinyue Liu, Ling-Dong Shi, Jiwei Li, Xi Xiao, Zongze Shao, View ORCID ProfileXiyang Dong
doi: https://doi.org/10.1101/2022.11.20.517286
Chuwen Zhang
1Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, China
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Xinyue Liu
1Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, China
2School of Marine Sciences, Sun Yat-Sen University, Zhuhai, China
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Ling-Dong Shi
3College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, China
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Jiwei Li
4Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China
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Xi Xiao
5Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, China
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Zongze Shao
1Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, China
6Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
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Xiyang Dong
1Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, China
6Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
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  • ORCID record for Xiyang Dong
  • For correspondence: dongxiyang@tio.org.cn
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Abstract

Cold seeps, where cold hydrocarbon-rich fluid escapes from the seafloor, showed strong enrichment of toxic metalloid arsenic (As). The toxicity and mobility of As can be greatly altered by microbial processes that play an important role in global As biogeochemical cycling. However, a global overview of genes and microbes involved in As transformation at seeps remains to be fully unveiled. Using 87 sediment metagenomes and 33 metatranscriptomes derived from 13 globally distributed cold seeps, we show that As resistance genes (arsM, arsP, arsC1/arsC2, acr3) were prevalent at seeps and more phylogenetically diverse than previously expected. Asgardarchaeota and a variety of unidentified bacterial phyla (e.g. 4484-113, AABM5-125-24 and RBG-13-66-14) may also function as the key players in As transformation. The abundances of As-cycling genes and the compositions of As-associated microbiome shifted across different sediment depths or types of cold seep. The energy-conserving arsenate reduction or arsenite oxidation could impact biogeochemical cycling of carbon and nitrogen, via supporting carbon fixation, hydrocarbon degradation and nitrogen fixation. Overall, this study provides a comprehensive overview of As-cycling genes and microbes at As-enriched cold seeps, laying a solid foundation for further studies of As cycling in deep sea microbiome at the enzymatic and processual levels.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
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 November 21, 2022.
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Novel and unexpected genetic and microbial diversity for arsenic cycling in deep sea cold seep sediments
Chuwen Zhang, Xinyue Liu, Ling-Dong Shi, Jiwei Li, Xi Xiao, Zongze Shao, Xiyang Dong
bioRxiv 2022.11.20.517286; doi: https://doi.org/10.1101/2022.11.20.517286
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Novel and unexpected genetic and microbial diversity for arsenic cycling in deep sea cold seep sediments
Chuwen Zhang, Xinyue Liu, Ling-Dong Shi, Jiwei Li, Xi Xiao, Zongze Shao, Xiyang Dong
bioRxiv 2022.11.20.517286; doi: https://doi.org/10.1101/2022.11.20.517286

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