[PROTOCOL] High-throughput cultivation based on dilution-to-extinction with catalase supplementation and a case study of cultivating acI bacteria from Lake Soyang

Suhyun Kim; Miri S. Park; Jaeho Song; Ilnam Kang; Jang-Cheon Cho

doi:10.1007/s12275-020-0452-2

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[PROTOCOL] High-throughput cultivation based on dilution-to-extinction with catalase supplementation and a case study of cultivating acI bacteria from Lake Soyang: Suhyun Kim , Miri S. Park , Jaeho Song , Ilnam Kang , Jang-Cheon Cho; Journal of Microbiology 2020;58(11):893-905.
DOI: https://doi.org/10.1007/s12275-020-0452-2
Published online: October 30, 2020

Department of Biological Sciences, Inha University, Incheon 22212, Republic of KoreaDepartment of Biological Sciences, Inha University, Incheon 22212, Republic of Korea

Corresponding author: Jang-Cheon Cho , Tel: +82-32-860-7711,

Received: 1 September 2020 • Accepted: 22 September 2020

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Abstract

Multi-omics approaches, including metagenomics and single- cell amplified genomics, have revolutionized our understanding of the hidden diversity and function of microbes in nature. Even in the omics age, cultivation is an essential discipline in microbial ecology since microbial cultures are necessary to assess the validity of an in silico prediction about the microbial metabolism and to isolate viruses infecting bacteria and archaea. However, the ecophysiological characteristics of predominant freshwater bacterial lineages remain largely unknown due to the scarcity of cultured representatives. In an ongoing effort to cultivate the uncultured majority of freshwater bacteria, the most abundant freshwater Actinobacteria acI clade has recently been cultivated from Lake Soyang through catalase-supplemented high-throughput cultivation based on dilution-to-extinction. This method involves physical isolation of target microbes from mixed populations, culture media simulating natural habitats, and removal of toxic compounds. In this protocol, we describe detailed procedures for isolating freshwater oligotrophic microbes, as well as the essence of the dilution-to-extinction culturing. As a case study employing the catalase-supplemented dilution-to-extinction protocol, we also report a cultivation trial using a water sample collected from Lake Soyang. Of the 480 cultivation wells inoculated with a single lake-water sample, 75 new acI strains belonging to 8 acI tribes (acI-A1, A2, A4, A5, A6, A7, B1, B4, C1, and C2) were cultivated, and each representative strain per subclade could be revived from glycerol stocks. These cultivation results demonstrate that the protocol described in this study is efficient in isolating freshwater bacterioplankton harboring streamlined genomes.

Keywords: DevSR;DosSR;MprBA;Mycobacterium;SigB;SigE;SigF;Stringent response;cAMP receptor protein

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[PROTOCOL] High-throughput cultivation based on dilution-to-extinction with catalase supplementation and a case study of cultivating acI bacteria from Lake Soyang

J. Microbiol. 2020;58(11):893-905. Published online October 30, 2020

DOI: https://doi.org/10.1007/s12275-020-0452-2

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