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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo

Volume 73, Issue 4

Proposed minimal standards for description of methanogenic archaea No Access

A corrigendum to this paper has been published here.

Abstract

Methanogenic archaea are a diverse, polyphyletic group of strictly anaerobic prokaryotes capable of producing methane as their primary metabolic product. It has been over three decades since minimal standards for their taxonomic description have been proposed. In light of advancements in technology and amendments in systematic microbiology, revision of the older criteria for taxonomic description is essential. Most of the previously recommended minimum standards regarding phenotypic characterization of pure cultures are maintained. Electron microscopy and chemotaxonomic methods like whole-cell protein and lipid analysis are desirable but not required. Because of advancements in DNA sequencing technologies, obtaining a complete or draft whole genome sequence for type strains and its deposition in a public database are now mandatory. Genomic data should be used for rigorous comparison to close relatives using overall genome related indices such as average nucleotide identity and digital DNA–DNA hybridization. Phylogenetic analysis of the 16S rRNA gene is also required and can be supplemented by phylogenies of the gene and phylogenomic analysis using multiple conserved, single-copy marker genes. Additionally, it is now established that culture purity is not essential for studying prokaryotes, and description of methanogenic taxa using single-cell or metagenomics along with other appropriate criteria is a viable alternative. The revisions to the minimal criteria proposed here by the members of the Subcommittee on the Taxonomy of Methanogenic Archaea of the International Committee on Systematics of Prokaryotes should allow for rigorous yet practical taxonomic description of these important and diverse microbes.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): archaea , methanoarchaea , methanogen , phylogeny and taxonomy
Funding
This study was supported by the:
  • National Research Foundation of Korea (Award MSIT 2021R1A2C3004015)
    • Principle Award Recipient: RheeSung-Keun
  • Japan Society for the Promotion of Science (Award 18H05295)
    • Principle Award Recipient: KamagataYoichi
  • Japan Society for the Promotion of Science (Award 19H01005)
    • Principle Award Recipient: ImachiHiroyuki
  • U.S. Department of Energy (Award DE-FG02-95ER20198)
    • Principle Award Recipient: FerryJames G.
  • Department of Biotechnology, Govt. of India (Award BT/PR13969/BCE/8/1142/2015)
    • Principle Award Recipient: PrakashOm
  • Department of Biotechnology, Govt. of India (Award BT/Coord.II/01/03/2016)
    • Principle Award Recipient: PrakashOm
  • United States National Science Foundation (Award DEB-1557042)
    • Principle Award Recipient: DodsworthJeremy A.
© 2022 The Authors

Erratum

An erratum has been published for this content:
Corrigendum: Proposed minimal standards for description of methanogenic archaea
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Proposed minimal standards for description of methanogenic archaea
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