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Cui HL, Hou J, Amoozegar MA, Dyall-Smith ML, de la Haba RR, Minegishi H, Montalvo-Rodriguez R, Oren A, Sanchez-Porro C, Ventosa A, Vreeland RH. Proposed minimal standards for description of new taxa of the class Halobacteria. Int J Syst Evol Microbiol 2024; 74:006290. [PMID: 38456846 PMCID: PMC10999741 DOI: 10.1099/ijsem.0.006290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 02/24/2024] [Indexed: 03/09/2024] Open
Abstract
Halophilic archaea of the class Halobacteria are the most salt-requiring prokaryotes within the domain Archaea. In 1997, minimal standards for the description of new taxa in the order Halobacteriales were proposed. From then on, the taxonomy of the class Halobacteria provides an excellent example of how changing concepts on prokaryote taxonomy and the development of new methods were implemented. The last decades have witnessed a rapid expansion of the number of described taxa within the class Halobacteria coinciding with the era of genome sequencing development. The current members of the International Committee on Systematics of Prokaryotes Subcommittee on the Taxonomy of Halobacteria propose these revisions to the recommended minimal standards and encourage the use of advanced technologies in the taxonomic description of members of the Halobacteria. Most previously required and some recommended minimal standards for the description of new taxa in the class Halobacteria were retained in the present revision, but changes have been proposed in line with the new methodologies. In addition to the 16S rRNA gene, the rpoB' gene is an important molecular marker for the identification of members of the Halobacteria. Phylogenomic analysis based on concatenated conserved, single-copy marker genes is required to infer the taxonomic status of new taxa. The overall genome relatedness indexes have proven to be determinative in the classification of the taxa within the class Halobacteria. Average nucleotide identity, digital DNA-DNA hybridization, and average amino acid identity values should be calculated for rigorous comparison among close relatives.
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Affiliation(s)
- Heng-Lin Cui
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Jing Hou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Mohammad Ali Amoozegar
- Department of Microbiology, School of Biology and Center of Excellence in Phylogeny of Living Organisms, College of Science, University of Tehran, Tehran 14178-64411, Iran
| | - Mike L. Dyall-Smith
- Veterinary Biosciences, Melbourne Veterinary School, Faculty of Science, University of Melbourne, Parkville, 3010, Australia
| | - Rafael R. de la Haba
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, Spain
| | - Hiroaki Minegishi
- Department of Applied Chemistry, Faculty of Science and Engineering, Toyo University, Kawagoe, Japan
| | | | - Aharon Oren
- Department of Plant and Environmental Sciences, The Institute of Life Sciences, The Edmond J. Safra Campus, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Cristina Sanchez-Porro
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, Spain
| | - Antonio Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, Spain
| | - Russell H. Vreeland
- Eastern Shore Microbes, 15397 Merry Cat Lane, Post Office Box 216, Belle Haven, VA 23306, USA
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