Frontiers in Microbiology (Jun 2022)

Metagenomic and Microscopic Analysis of Magnetotactic Bacteria in Tangyin Hydrothermal Field of Okinawa Trough

  • Si Chen,
  • Si Chen,
  • Si Chen,
  • Si Chen,
  • Min Yu,
  • Min Yu,
  • Wenyan Zhang,
  • Wenyan Zhang,
  • Wenyan Zhang,
  • Wenyan Zhang,
  • Kuang He,
  • Hongmiao Pan,
  • Hongmiao Pan,
  • Hongmiao Pan,
  • Hongmiao Pan,
  • Kaixuan Cui,
  • Kaixuan Cui,
  • Kaixuan Cui,
  • Kaixuan Cui,
  • Yicong Zhao,
  • Yicong Zhao,
  • Yicong Zhao,
  • Yicong Zhao,
  • Xiao-Hua Zhang,
  • Xiao-Hua Zhang,
  • Tian Xiao,
  • Tian Xiao,
  • Tian Xiao,
  • Tian Xiao,
  • Wuchang Zhang,
  • Wuchang Zhang,
  • Wuchang Zhang,
  • Long-Fei Wu,
  • Long-Fei Wu

DOI
https://doi.org/10.3389/fmicb.2022.887136
Journal volume & issue
Vol. 13

Abstract

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Magnetotactic bacteria (MTB) have been found in a wide variety of marine habitats, ranging from intertidal sediments to deep-sea seamounts. Deep-sea hydrothermal fields are rich in metal sulfides, which are suitable areas for the growth of MTB. However, MTB in hydrothermal fields have never been reported. Here, the presence of MTB in sediments from the Tangyin hydrothermal field was analyzed by 16S rRNA gene amplicon analysis, metagenomics, and transmission electron microscopy. Sequencing 16S rRNA gene yielded a total of 709 MTB sequences belonging to 20 OTUs, affiliated with Desulfobacterota, Alphaproteobacteria, and Nitrospirae. Three shapes of magnetofossil were identified by transmission electron microscopy: elongated-prismatic, bullet-shaped, and cuboctahedron. All of these structures were composed of Fe3O4. A total of 121 sequences were found to be homologous to the published MTB magnetosome-function-related genes, and relevant domains were identified. Further analysis revealed that diverse MTB are present in the Tangyin hydrothermal field, and that multicellular magnetotactic prokaryote (MMPs) might be the dominant MTB.

Keywords