1
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Jiao JY, Abdugheni R, Zhang DF, Ahmed I, Ali M, Chuvochina M, Dedysh SN, Dong X, Göker M, Hedlund BP, Hugenholtz P, Jangid K, Liu SJ, Moore ERB, Narsing Rao MP, Oren A, Rossello-Mora R, Rekadwad BN, Salam N, Shu W, Sutcliffe IC, Teo WFA, Trujillo ME, Venter SN, Whitman WB, Zhao G, Li WJ. Advancements in prokaryotic systematics and the role of Bergey's International Society for Microbial Systematicsin addressing challenges in the meta-data era. Natl Sci Rev 2024; 11:nwae168. [PMID: 39071100 PMCID: PMC11275469 DOI: 10.1093/nsr/nwae168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 04/30/2024] [Accepted: 05/03/2024] [Indexed: 07/30/2024] Open
Abstract
Prokaryotes are ubiquitous in the biosphere, important for human health and drive diverse biological and environmental processes. Systematics of prokaryotes, whose origins can be traced to the discovery of microorganisms in the 17th century, has transitioned from a phenotype-based classification to a more comprehensive polyphasic taxonomy and eventually to the current genome-based taxonomic approach. This transition aligns with a foundational shift from studies focused on phenotypic traits that have limited comparative value to those using genome sequences. In this context, Bergey's Manual of Systematics of Archaea and Bacteria (BMSAB) and Bergey's International Society for Microbial Systematics (BISMiS) play a pivotal role in guiding prokaryotic systematics. This review focuses on the historical development of prokaryotic systematics with a focus on the roles of BMSAB and BISMiS. We also explore significant contributions and achievements by microbiologists, highlight the latest progress in the field and anticipate challenges and opportunities within prokaryotic systematics. Additionally, we outline five focal points of BISMiS that are aimed at addressing these challenges. In conclusion, our collaborative effort seeks to enhance ongoing advancements in prokaryotic systematics, ensuring its continued relevance and innovative characters in the contemporary landscape of genomics and bioinformatics.
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Affiliation(s)
- Jian-Yu Jiao
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Rashidin Abdugheni
- State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
| | - Dao-Feng Zhang
- Jiangsu Province Engineering Research Center for Marine Bio-resources Sustainable Utilization & College of Oceanography, Hohai University, Nanjing 210024, China
| | - Iftikhar Ahmed
- National Culture Collection of Pakistan (NCCP), Land Resources Research Institute (LRRI), National Agricultural Research Centre (NARC), Islamabad 45500, Pakistan
| | - Mukhtiar Ali
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Maria Chuvochina
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Queensland 4072, Australia
| | - Svetlana N Dedysh
- Winogradsky Institute of Microbiology, Research Center of Biotechnology, Russian Academy of Sciences, Moscow 117312, Russia
| | - Xiuzhu Dong
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Markus Göker
- Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig D-38124, Germany
| | - Brian P Hedlund
- School of Life Sciences, University of Nevada, Las Vegas, NV 89154, USA
- Nevada Institute of Personalized Medicine, University of Nevada, Las Vegas, NV 89154, USA
| | - Philip Hugenholtz
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Queensland 4072, Australia
| | - Kamlesh Jangid
- Bioenergy Group, MACS Collection of Microorganisms, Agharkar Research Institute, Pune 411004, India
| | - Shuang-Jiang Liu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Edward R B Moore
- Department of Infectious Disease, Institute for Biomedicine, and Culture Collection University of Gothenburg (CCUG), Institute for Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg SE-40234, Sweden
| | - Manik Prabhu Narsing Rao
- Instituto de Ciencias Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, Talca 3460000, Chile
| | - Aharon Oren
- The Alexander Silberman Institute of Life Sciences, The Edmond J. Safra Campus, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Ramon Rossello-Mora
- Marine Microbiology Group, Department of Animal and Microbial Biodiversity, Mediterranean Institute for Advanced Studies (IMEDEA, CSIC-UIB), Esporles 070190, Spain
| | - Bhagwan Narayan Rekadwad
- MicrobeAI Lab, Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore 575018, India
| | - Nimaichand Salam
- National Agri-Food Biotechnology Institute, Knowledge City, Mohali 140306, India
| | - Wensheng Shu
- Institute of Ecological Science, School of Life Science, South China Normal University, Guangzhou 510631, China
| | - Iain C Sutcliffe
- Department of Applied Sciences, Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
| | - Wee Fei Aaron Teo
- Institute of Biological Sciences, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Martha E Trujillo
- Microbiology and Genetics Department, University of Salamanca, Salamanca 37008, Spain
| | - Stephanus N Venter
- Department of Biochemistry, Genetics and Microbiology, and Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria 0028, South Africa
| | - William B Whitman
- Department of Microbiology, University of Georgia, Athens, GA 30602, USA
| | - Guoping Zhao
- Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Wen-Jun Li
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
- State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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2
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Whitman WB, Venter SN. Commentary on the proposed Section 10 amendments to the International Code of Nomenclature of Prokaryotes regarding Candidatus names. Syst Appl Microbiol 2024; 47:126524. [PMID: 38878497 DOI: 10.1016/j.syapm.2024.126524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Revised: 06/11/2024] [Accepted: 06/12/2024] [Indexed: 07/06/2024]
Abstract
Amendments were proposed to the International Code of Nomenclature of Prokaryotes (ICNP) in January [Arahal et al. (2024) Int. J Syst. Evol. Microbiol. 74: 006188] that would cause major changes in the treatment of Candidatus names. The amendments introduce Section 10 to name taxa whose names cannot be validly published under the ICNP because of the absence of type strains. This section creates a parallel 'pro-nomenclature' and formalizes alternative material which could serve as nomenclatural types. When conspecific isolates of taxa with Candidatus names are deposited in culture collections as type strains, the names can be validly published, and it is required that the same Candidatus name be used. While the amendments are promoted to provide stable names and rules of nomenclature for uncultivated taxa, the system is deeply flawed. It removes the permanent association between names and types, which will make the meaning of names imprecise and ambiguous. It creates 'pro-nomenclature', which is confusing and unnecessary. Since many taxa which cannot be validly named under the ICNP can already be named under the SeqCode, it duplicates and creates overlap with an established nomenclatural system without providing tangible benefits. As the SeqCode recognizes names formed under the ICNP, the ICNP should recognize names formed under the SeqCode as they have done for the Cyanobacteria named under the International Code of Nomenclature for algae, fungi and plants (ICN). For these reasons, we urge the members of the International Committee of Systematics of Prokaryotes (ICSP) to reject these amendments.
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Affiliation(s)
| | - Stephanus N Venter
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa.
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3
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Jiménez DJ, Rosado AS. SeqCode in the golden age of prokaryotic systematics. THE ISME JOURNAL 2024; 18:wrae109. [PMID: 38896025 PMCID: PMC11384910 DOI: 10.1093/ismejo/wrae109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 05/08/2024] [Accepted: 06/18/2024] [Indexed: 06/21/2024]
Abstract
The SeqCode is a new code of prokaryotic nomenclature that was developed to validate taxon names using genome sequences as the type material. The present article provides an independent view about the SeqCode, highlighting its history, current status, basic features, pros and cons, and use to date. We also discuss important topics to consider for validation of novel prokaryotic taxon names using genomes as the type material. Owing to significant advances in metagenomics and cultivation methods, hundreds of novel prokaryotic species are expected to be discovered in the coming years. This manuscript aims to stimulate and enrich the debate around the use of the SeqCode in the upcoming golden age of prokaryotic taxon discovery and systematics.
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Affiliation(s)
- Diego Javier Jiménez
- Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Alexandre Soares Rosado
- Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
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Arahal D, Bisgaard M, Christensen H, Clermont D, Dijkshoorn L, Duim B, Emler S, Figge M, Göker M, Moore ERB, Nemec A, Nørskov-Lauritsen N, Nübel U, On SLW, Vandamme P, Ventosa A. The best of both worlds: a proposal for further integration of Candidatus names into the International Code of Nomenclature of Prokaryotes. Int J Syst Evol Microbiol 2024; 74. [PMID: 38180015 DOI: 10.1099/ijsem.0.006188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024] Open
Abstract
The naming of prokaryotes is governed by the International Code of Nomenclature of Prokaryotes (ICNP) and partially by the International Code of Nomenclature for Algae, Fungi and Plants (ICN). Such codes must be able to determine names of taxa in a universal and unambiguous manner, thus serving as a common language across different fields and activities. This unity is undermined when a new code of nomenclature emerges that overlaps in scope with an established, time-tested code and uses the same format of names but assigns different nomenclatural status values to the names. The resulting nomenclatural confusion is not beneficial to the wider scientific community. Such ambiguity is expected to result from the establishment of the 'Code of Nomenclature of Prokaryotes Described from DNA Sequence Data' ('SeqCode'), which is in general and specific conflict with the ICNP and the ICN. Shortcomings in the interpretation of the ICNP may have exacerbated the incompatibility between the codes. It is reiterated as to why proposals to accept sequences as nomenclatural types of species and subspecies with validly published names, now implemented in the SeqCode, have not been implemented by the International Committee on Systematics of Prokaryotes (ICSP), which oversees the ICNP. The absence of certain regulations from the ICNP for the naming of as yet uncultivated prokaryotes is an acceptable scientific argument, although it does not justify the establishment of a separate code. Moreover, the proposals rejected by the ICSP are unnecessary to adequately regulate the naming of uncultivated prokaryotes. To provide a better service to the wider scientific community, an alternative proposal to emend the ICNP is presented, which would result in Candidatus names being regulated analogously to validly published names. This proposal is fully consistent with previous ICSP decisions, preserves the essential unity of nomenclature and avoids the expected nomenclatural confusion.
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Affiliation(s)
- David Arahal
- Departamento de Microbiología y Ecología, Universitat de València, Valencia, Spain
| | | | - Henrik Christensen
- Department of Veterinary and Animal Sciences, University of Copenhagen, Stigbøjlen 4, 1870 Frederiksberg C, Denmark
| | - Dominique Clermont
- Institut Pasteur, Université Paris Cité, CRBIP, CIP-Collection of Institut Pasteur, F-75015 Paris, France
| | - Lenie Dijkshoorn
- Department of Infectious Diseases, Leiden University Medical Center, Albinusdreef 2, Leiden / Torensteelaan 68, 3281 MA Numansdorp, Netherlands
| | - Birgitta Duim
- Department Biomolecular Health Sciences, Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 1, 3584 CS Utrecht, Netherlands
| | - Stefan Emler
- SmartGene Services SARL, EPFL Innovation Park, PSE-C, CH-1015 Lausanne, Switzerland
| | - Marian Figge
- Westerdijk Fungal Biodiversity Institute Uppsalalaan 8 3584 CT, Utrecht, Netherlands
| | - Markus Göker
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstrasse 7B, D-38124 Braunschweig, Germany
| | - Edward R B Moore
- Department of Infectious Disease and Culture Collection University of Gothenburg (CCUG), Institute for Biomedicine, Sahlgrenska Academy, University of Gothenburg, SE-402 34 Gothenburg, Sweden
| | - Alexandr Nemec
- Laboratory of Bacterial Genetics, National Institute of Public Health, Srobarova 48, 100 00 Prague 10, Czech Republic
- Department of Medical Microbiology, Charles University, 2nd Faculty of Medicine and Motol University Hospital, Prague, V Úvalu 84, 150 06 Prague 5, Czechia
| | | | - Ulrich Nübel
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstrasse 7B, D-38124 Braunschweig, Germany
- Technical University Braunschweig, Institute of Microbiology, Braunschweig, Germany
- German Center for Infection Research (DZIF), Partner Site Braunschweig-Hannover, Braunschweig, Germany
| | - Stephen L W On
- Department of Wine, Food and Molecular Biosciences, Faculty of Agricultural Science, Lincoln University, Lincoln 7647, Christchurch, New Zealand
| | - Peter Vandamme
- BCCM/LMG, Laboratorium voor Microbiologie, Universiteit Gent (UGent) K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
| | - Antonio Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, C/. Prof. Garcia Gonzalez 2, ES-41012 Sevilla, Spain
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On SLW. Minutes of the inaugural 25 October 2022 meeting of International Committee on Systematics of Prokaryotes (ICSP) Subcommittees on Taxonomy representatives: challenges, trends, and perspectives for microbial taxonomists. Int J Syst Evol Microbiol 2023; 73. [PMID: 37787396 DOI: 10.1099/ijsem.0.006075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023] Open
Affiliation(s)
- Stephen L W On
- Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand
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Greub G, Pillonel T, Bavoil PM, Borel N, Campbell LA, Dean D, Hefty S, Horn M, Morré SA, Ouellette SP, Pannekoek Y, Puolakkainen M, Timms P, Valdivia R, Vanrompay D. Use of gene sequences as type for naming prokaryotes: Recommendations of the international committee on the taxonomy of chlamydiae. New Microbes New Infect 2023; 54:101158. [PMID: 37416863 PMCID: PMC10320375 DOI: 10.1016/j.nmni.2023.101158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 06/01/2023] [Accepted: 06/07/2023] [Indexed: 07/08/2023] Open
Abstract
The International Committee on Systematics of Prokaryotes (ICSP) discussed and rejected in 2020 a proposal to modify the International Code of Nomenclature of Prokaryotes to allow the use of gene sequences as type for naming prokaryotes. An alternative nomenclatural code, the Code of Nomenclature of Prokaryotes Described from Sequence Data (SeqCode), which considers genome sequences as type material for naming species, was published in 2022. Members of the ICSP subcommittee for the taxonomy of the phylum Chlamydiae (Chlamydiota) consider that the use of gene sequences as type would benefit the taxonomy of microorganisms that are difficult to culture such as the chlamydiae and other strictly intracellular bacteria. We recommend the registration of new names of uncultured prokaryotes in the SeqCode registry.
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Affiliation(s)
- Gilbert Greub
- Centre for Research on Intracellular Bacteria, Institute of Microbiology, University Hospital Centre and University of Lausanne, Bugnon 48, 1011, Lausanne, Switzerland
| | - Trestan Pillonel
- Centre for Research on Intracellular Bacteria, Institute of Microbiology, University Hospital Centre and University of Lausanne, Bugnon 48, 1011, Lausanne, Switzerland
| | - Patrik M. Bavoil
- Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore, MD, USA
| | - Nicole Borel
- Department of Pathobiology, Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 268, CH-8057, Zurich, Switzerland
| | - Lee Ann Campbell
- Department of Global Health, University of Washington, Seattle, WA, USA
| | - Deborah Dean
- Departments of Medicine and Pediatrics, University of California San Francisco School of Medicine, Oakland, CA, USA
| | - Scott Hefty
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS, USA
| | - Matthias Horn
- Centre for Microbiology and Environmental Systems Science, University of Vienna, 1090, Vienna, Austria
| | - Servaas A. Morré
- Laboratory of Immunogenetics, Department of Medical Microbiology and Infection Control, VU University Medical Center, Amsterdam, the Netherlands
- Institute for Public Health Genomics (IPHG), Department of Genetics and Cell Biology, Research School GROW (School for Oncology & Developmental Biology), Faculty of Health, Medicine & Life Sciences, University of Maastricht, Maastricht, the Netherlands
- Dutch Chlamydia Trachomatis Reference Laboratory, Department of Medical Microbiology & Infection Control, VU University Medical Centre, Amsterdam, the Netherlands
| | - Scot P. Ouellette
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Yvonne Pannekoek
- Department of Medical Microbiology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Mirja Puolakkainen
- Department of Virology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Peter Timms
- Genecology Research Center, University of Sunshine Coast, Queensland, Australia
| | - Raphael Valdivia
- Department of Molecular Genetics and Microbiology, Duke University, Durham, NC, 27710, USA
| | - Daisy Vanrompay
- Department of Animal Science and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
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Mousavi SA, Young JPW. International Committee on Systematics of Prokaryotes Subcommittee on the Taxonomy of Rhizobia and Agrobacteria. Minutes of the closed annual meeting: videoconference on 11 October 2022 followed by online discussion until 31 December 2022. Int J Syst Evol Microbiol 2023; 73. [PMID: 37115621 DOI: 10.1099/ijsem.0.005856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Affiliation(s)
- Seyed Abdollah Mousavi
- Ecosystems and Environment Research Programme, University of Helsinki, Helsinki, Finland
| | - J Peter W Young
- Department of Biology, University of York, York YO10 5DD, UK
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Oren A. Naming new taxa of prokaryotes in the 21st century. Can J Microbiol 2023; 69:151-157. [PMID: 36852830 DOI: 10.1139/cjm-2022-0266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
The nomenclature of prokaryotes is regulated by the rules of the International Code of Nomenclature of Prokaryotes (ICNP) and is based on the Linnaean binomial system. The current rules of the Code only cover the nomenclature of the cultivated minority. Proposals to incorporate the uncultivated majority of bacteria and archaea under the rules of the Code were recently rejected by the International Committee on Systematics of Prokaryotes. The provisional rank of Candidatus can be used to name uncultivated prokaryotes whose names cannot be validly published under the rules of the ICNP, but their names can now be validated under the Code of Nomenclature of Prokaryotes Described from Sequence Data (the SeqCode), which was recently established to cover the nomenclature of the uncultivated majority. Metagenomics, single-cell genomics, and high-throughput cultivation techniques have led to a flood of new organisms currently waiting to be named. Automated programs such as GAN and Protologger can assist researchers in naming and describing newly discovered prokaryotes, cultivated as well as uncultivated. However, Latin and Greek skills remain indispensable for proper quality control of names that must meet the standards set by the codes of nomenclature.
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Affiliation(s)
- Aharon Oren
- Department of Plant and Environmental Sciences, The Institute of Life Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel
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Kannan S, Sharma S, Ciufo S, Clark K, Turner S, Kitts PA, Schoch CL, DiCuccio M, Kimchi A. Collection and curation of prokaryotic genome assemblies from type strains at NCBI. Int J Syst Evol Microbiol 2023; 73. [PMID: 36748495 DOI: 10.1099/ijsem.0.005707] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The public sequence databases are entrusted with the dual responsibility of providing an accessible archive to all submitters and supporting data reliability and its re-use to all users. Genomes from type materials can act as an unambiguous reference for a taxonomic name and play an important role in comparative genomics, especially for taxon verification or reclassification. The National Center for Biotechnology Information (NCBI) collects and curates information on prokaryotic type strains and genomes from type strains. The average nucleotide identity (ANI)-based quality control processes introduced at NCBI to verify the genomes from type strains and improve related sequence records are detailed here. Using the curated genomes from type strains as reference, the taxonomy of over 1.1 million GenBank genomes were verified and the taxonomy of over 7000 new submissions before acceptance to GenBank and over 1800 existing genomes in GenBank were reclassified.
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Affiliation(s)
- Sivakumar Kannan
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
| | - Shobha Sharma
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
| | - Stacy Ciufo
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
| | - Karen Clark
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
| | - Seán Turner
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
| | - Paul A Kitts
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
| | - Conrad L Schoch
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
| | - Michael DiCuccio
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
| | - Avi Kimchi
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 9600 Rockville Pike, Bethesda, MD, 20892, USA
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10
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Göker M, Moore ERB, Oren A, Trujillo ME. Status of the SeqCode in the International Journal of Systematic and Evolutionary Microbiology. Int J Syst Evol Microbiol 2022; 72. [PMID: 36748408 DOI: 10.1099/ijsem.0.005754] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The recent publication of an alternative nomenclatural code that targets prokaryotes, the Code of Nomenclature of Prokaryotes Described from DNA Sequence Data (SeqCode), raises questions about how to treat names 'validly published' under that code in the International Journal of Systematic and Evolutionary Microbiology (IJSEM). Here, it is reiterated that the IJSEM must function in accordance with the International Code of Nomenclature of Prokaryotes (ICNP). It is also reiterated that the ICNP covers all prokaryotes and that it accordingly assigns a nomenclatural status to all names of prokaryotic taxa. This implies that the ICNP also assigns a status to names that are only 'validly published' under the SeqCode. It follows that the IJSEM must treat such names as not validly published, since 'validly published under the SeqCode' is not a nomenclatural status, under the ICNP. Such names should be marked accordingly as Candidatus names or printed in quotation marks. The same measures would need to be taken by other journals which intend to adhere to the ICNP.
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Affiliation(s)
- Markus Göker
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstrasse 7B, D-38124 Braunschweig, Germany
| | - Edward R B Moore
- Department of Infectious Disease and Culture Collection University of Gothenburg (CCUG), Institute for Biomedicine, Sahlgrenska Academy, University of Gothenburg, SE-402 34 Gothenburg, Sweden
| | - Aharon Oren
- The Hebrew University of Jerusalem, The Institute of Life Sciences, Edmond J. Safra Campus - Givat Ram, 9190401 Jerusalem, Israel
| | - Martha E Trujillo
- University of Salamanca, Dpto de Microbiología y Genética, Campus Unamuno, 37007 Salamanca, Spain
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Achtman M, Zhou Z, Charlesworth J, Baxter L. EnteroBase: hierarchical clustering of 100 000s of bacterial genomes into species/subspecies and populations. Philos Trans R Soc Lond B Biol Sci 2022; 377:20210240. [PMID: 35989609 PMCID: PMC9393565 DOI: 10.1098/rstb.2021.0240] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Accepted: 03/07/2022] [Indexed: 12/14/2022] Open
Abstract
The definition of bacterial species is traditionally a taxonomic issue while bacterial populations are identified by population genetics. These assignments are species specific, and depend on the practitioner. Legacy multilocus sequence typing is commonly used to identify sequence types (STs) and clusters (ST Complexes). However, these approaches are not adequate for the millions of genomic sequences from bacterial pathogens that have been generated since 2012. EnteroBase (http://enterobase.warwick.ac.uk) automatically clusters core genome MLST allelic profiles into hierarchical clusters (HierCC) after assembling annotated draft genomes from short-read sequences. HierCC clusters span core sequence diversity from the species level down to individual transmission chains. Here we evaluate HierCC's ability to correctly assign 100 000s of genomes to the species/subspecies and population levels for Salmonella, Escherichia, Clostridoides, Yersinia, Vibrio and Streptococcus. HierCC assignments were more consistent with maximum-likelihood super-trees of core SNPs or presence/absence of accessory genes than classical taxonomic assignments or 95% ANI. However, neither HierCC nor ANI were uniformly consistent with classical taxonomy of Streptococcus. HierCC was also consistent with legacy eBGs/ST Complexes in Salmonella or Escherichia and with O serogroups in Salmonella. Thus, EnteroBase HierCC supports the automated identification of and assignment to species/subspecies and populations for multiple genera. This article is part of a discussion meeting issue 'Genomic population structures of microbial pathogens'.
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12
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Hedlund BP, Chuvochina M, Hugenholtz P, Konstantinidis KT, Murray AE, Palmer M, Parks DH, Probst AJ, Reysenbach AL, Rodriguez-R LM, Rossello-Mora R, Sutcliffe IC, Venter SN, Whitman WB. SeqCode: a nomenclatural code for prokaryotes described from sequence data. Nat Microbiol 2022; 7:1702-1708. [PMID: 36123442 PMCID: PMC9519449 DOI: 10.1038/s41564-022-01214-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 07/25/2022] [Indexed: 01/03/2023]
Abstract
Most prokaryotes are not available as pure cultures and therefore ineligible for naming under the rules and recommendations of the International Code of Nomenclature of Prokaryotes (ICNP). Here we summarize the development of the SeqCode, a code of nomenclature under which genome sequences serve as nomenclatural types. This code enables valid publication of names of prokaryotes based upon isolate genome, metagenome-assembled genome or single-amplified genome sequences. Otherwise, it is similar to the ICNP with regard to the formation of names and rules of priority. It operates through the SeqCode Registry ( https://seqco.de/ ), a registration portal through which names and nomenclatural types are registered, validated and linked to metadata. We describe the two paths currently available within SeqCode to register and validate names, including Candidatus names, and provide examples for both. Recommendations on minimal standards for DNA sequences are provided. Thus, the SeqCode provides a reproducible and objective framework for the nomenclature of all prokaryotes regardless of cultivability and facilitates communication across microbiological disciplines.
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Affiliation(s)
- Brian P Hedlund
- School of Life Sciences, University of Nevada, Las Vegas, Las Vegas, NV, USA
| | - Maria Chuvochina
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Brisbane, Queensland, Australia
| | - Philip Hugenholtz
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Brisbane, Queensland, Australia
| | | | - Alison E Murray
- Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, USA
| | - Marike Palmer
- School of Life Sciences, University of Nevada, Las Vegas, Las Vegas, NV, USA
| | - Donovan H Parks
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Brisbane, Queensland, Australia
| | - Alexander J Probst
- Department of Chemistry, Environmental Microbiology and Biotechnology (EMB), Group for Aquatic Microbial Ecology and Centre of Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, Germany
| | | | - Luis M Rodriguez-R
- Department of Microbiology and Digital Science Center (DiSC), University of Innsbruck, Innsbruck, Austria
| | - Ramon Rossello-Mora
- Marine Microbiology Group, Department of Animal and Microbial Diversity, Mediterranean Institute of Advanced Studies (CSIC-UIB), Esporles, Spain
| | - Iain C Sutcliffe
- Faculty of Health & Life Sciences, Northumbria University, Newcastle upon Tyne, UK
| | - Stephanus N Venter
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
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13
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Whitman WB, Chuvochina M, Hedlund BP, Hugenholtz P, Konstantinidis KT, Murray AE, Palmer M, Parks DH, Probst AJ, Reysenbach AL, Rodriguez-R LM, Rossello-Mora R, Sutcliffe I, Venter SN. Development of the SeqCode: A proposed nomenclatural code for uncultivated prokaryotes with DNA sequences as type. Syst Appl Microbiol 2022; 45:126305. [PMID: 36049255 PMCID: PMC9489671 DOI: 10.1016/j.syapm.2022.126305] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 01/30/2022] [Accepted: 01/31/2022] [Indexed: 11/15/2022]
Abstract
Over the last fifteen years, genomics has become fully integrated into prokaryotic systematics. The genomes of most type strains have been sequenced, genome sequence similarity is widely used for delineation of species, and phylogenomic methods are commonly used for classification of higher taxonomic ranks. Additionally, environmental genomics has revealed a vast diversity of as-yet-uncultivated taxa. In response to these developments, a new code of nomenclature, the Code of Nomenclature of Prokaryotes Described from Sequence Data (SeqCode), has been developed over the last two years to allow naming of Archaea and Bacteria using DNA sequences as the nomenclatural types. The SeqCode also allows naming of cultured organisms, including fastidious prokaryotes that cannot be deposited into culture collections. Several simplifications relative to the International Code of Nomenclature of Prokaryotes (ICNP) are implemented to make nomenclature more accessible, easier to apply and more readily communicated. By simplifying nomenclature with the goal of a unified classification, inclusive of both cultured and uncultured taxa, the SeqCode will facilitate the naming of taxa in every biome on Earth, encourage the isolation and characterization of as-yet-uncultivated taxa, and promote synergies between the ecological, environmental, physiological, biochemical, and molecular biological disciplines to more fully describe prokaryotes.
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Affiliation(s)
| | - Maria Chuvochina
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Australia
| | - Brian P Hedlund
- School of Life Sciences, University of Nevada, Las Vegas, NV, USA
| | - Philip Hugenholtz
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Australia
| | | | - Alison E Murray
- Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, USA
| | - Marike Palmer
- School of Life Sciences, University of Nevada, Las Vegas, NV, USA
| | - Donovan H Parks
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Australia
| | - Alexander J Probst
- Department of Chemistry, Environmental Microbiology and Biotechnology (EMB), Group for Aquatic Microbial Ecology and Centre of Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, Germany
| | | | - Luis M Rodriguez-R
- Department of Microbiology and Digital Science Center (DiSC), University of Innsbruck, Innrain 15 / 01-05, Innsbruck 6020, Austria
| | - Ramon Rossello-Mora
- Marine Microbiology Group, Department of Animal and Microbial Diversity, Mediterranean Institute of Advanced Studies (CSIC-UIB), Esporles, Illes Balears, Spain
| | - Iain Sutcliffe
- Faculty of Health & Life Sciences, Northumbria University, Newcastle upon Tyne, UK
| | - Stephanus N Venter
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, South Africa
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14
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It’s time for a new type of type to facilitate naming the microbial world. New Microbes New Infect 2022; 47:100991. [PMID: 35800027 PMCID: PMC9253472 DOI: 10.1016/j.nmni.2022.100991] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 04/09/2022] [Accepted: 04/19/2022] [Indexed: 12/02/2022] Open
Abstract
Since January 1, 2001, the only acceptable nomenclatural type for species under the International Code of Nomenclature of Prokaryotes (ICNP) has been pure cultures. Here, we argue that this requirement is discordant with the more inclusive nature of nomenclatural types accepted under other codes of nomenclature and posit that the unique rigidity of the ICNP has failed to serve the broad research community and has stifled progress. This case is based on the axiom that many archaea and bacteria are interdependent in nature and therefore difficult, if not impossible, to grow, preserve, and distribute as pure cultures. As such, a large proportion of Earth's biodiversity cannot be named under the current system, which limits our ability to communicate about microbial diversity within and beyond the microbiology research community. Genome sequence data are now encouraged for valid publication of new taxa in microbial systematics journals, and metagenome-assembled genomes and single cell-amplified genomes are being generated rapidly from every biome on Earth. Thus, genome sequences are available for both cultivated and uncultivated microorganisms and can readily serve as a new category of nomenclatural type, allowing for a unified nomenclature for all archaea and bacteria, whether or not they are available as pure cultures. Ideally this would be under a single code of nomenclature but, as we review here, the newly established SeqCode will operate in parallel with the ICNP as a first step toward this goal.
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15
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ICSP response to 'Science depends on nomenclature, but nomenclature is not science'. Nat Rev Microbiol 2022; 20:249-250. [PMID: 35181770 DOI: 10.1038/s41579-022-00706-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Oren A. Nomenclature of prokaryotic ' Candidatus' taxa: establishing order in the current chaos. New Microbes New Infect 2021; 44:100932. [PMID: 34631108 PMCID: PMC8487987 DOI: 10.1016/j.nmni.2021.100932] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 08/05/2021] [Accepted: 08/09/2021] [Indexed: 11/18/2022] Open
Abstract
In the mid-1990s, the category 'Candidatus' was established for putative taxa of as yet uncultivated prokaryotes. The status of 'Candidatus' is not formally included in the rules of the International Code of Nomenclature of Prokaryotes. Thus, 'Candidatus' names do not have standing in the nomenclature. Curated annotated lists of 'Candidatus' names (not including phyla) have been published since 2020. By April 2021, about 2700 names of 'Candidatus' taxa had been published. The International Committee on Systematics of Prokaryotes recently rejected proposals to allow gene sequence data as nomenclatural types. An alternative code for naming uncultivated microorganisms (the 'SeqCode') is now being developed for naming the majority of prokaryotes that are as yet uncultivated. In the opinion of the author, there is no need for such a code, as the existing system, with nomenclature quality control also for 'Candidatus' names, fulfills the needs. Computer programs such as GAN which generates large numbers of correctly formed names from the short lists of Latin and Greek word elements and Protologger that produce descriptions directly from genome sequences will become important in the future for automated naming and description of large numbers of 'Candidatus' taxa from metagenomic and single cell genome data. However, the formation of interesting and meaningful names is encouraged whenever possible.
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Affiliation(s)
- A. Oren
- The Institute of Life Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem, Israel
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17
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Abstract
The remarkable success of taxonomic discovery, powered by culturomics, genomics and metagenomics, creates a pressing need for new bacterial names while holding a mirror up to the slow pace of change in bacterial nomenclature. Here, I take a fresh look at bacterial nomenclature, exploring how we might create a system fit for the age of genomics, playing to the strengths of current practice while minimizing difficulties. Adoption of linguistic pragmatism-obeying the rules while treating recommendations as merely optional-will make it easier to create names derived from descriptions, from people or places or even arbitrarily. Simpler protologues and a relaxed approach to recommendations will also remove much of the need for expert linguistic quality control. Automated computer-based approaches will allow names to be created en masse before they are needed while also relieving microbiologists of the need for competence in Latin. The result will be a system that is accessible, inclusive and digital, while also fully capable of naming the unnamed millions of bacteria.
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Affiliation(s)
- M.J. Pallen
- Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
- Norwich Medical School, University of East Anglia, Norwich Research Park, Norwich, UK
- School of Veterinary Medicine, University of Surrey, Guildford, Surrey, UK
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18
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Jung P, Brust K, Schultz M, Büdel B, Donner A, Lakatos M. Opening the Gap: Rare Lichens With Rare Cyanobionts - Unexpected Cyanobiont Diversity in Cyanobacterial Lichens of the Order Lichinales. Front Microbiol 2021; 12:728378. [PMID: 34690969 PMCID: PMC8527099 DOI: 10.3389/fmicb.2021.728378] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 08/25/2021] [Indexed: 11/13/2022] Open
Abstract
The last decades of research led to a change in understanding of lichens that are now seen as self-sustaining micro-ecosystems, harboring diverse microbial organisms in tight but yet not fully understood relationships. Among the diverse interdependencies, the relationship between the myco- and photobiont is the most crucial, determining the shape, and ecophysiological properties of the symbiotic consortium. Roughly 10% of lichens associate with cyanobacteria as their primary photobiont, termed cyanolichens. Up to now, the diversity of cyanobionts of bipartite lichens resolved by modern phylogenetic approaches is restricted to the filamentous and heterocytous genera of the order Nostocales. Unicellular photobionts were placed in the orders Chroococcales, Pleurocapsales, and Chroococcidiopsidales. However, especially the phylogeny and taxonomy of the Chroococcidiopsidales genera remained rather unclear. Here we present new data on the identity and phylogeny of photobionts from cyanolichens of the genera Gonohymenia, Lichinella, Peccania, and Peltula from a broad geographical range. A polyphasic approach was used, combining morphological and cultivation-depending characteristics (microscopy, staining techniques, life cycle observation, baeocyte motility, and nitrogen fixation test) with phylogenetic analyses of the 16S rRNA and 16S–23S ITS gene region. We found an unexpectedly high cyanobiont diversity in the cyanobacterial lichens of the order Lichinales, including two new genera and seven new species, all of which were not previously perceived as lichen symbionts. As a result, we describe the novel unicellular Chroococcidiopsidales genera Pseudocyanosarcina gen. nov. with the species Pseudocyanosarcina phycocyania sp. nov. (from Peltula clavata, Australia) and Compactococcus gen. nov. with the species Compactococcus sarcinoides sp. nov. (from Gonohymenia sp., Australia) and the new Chroococcidiopsidales species Aliterella compacta sp. nov. (from Peltula clavata, Australia), Aliterella gigantea sp. nov. (from Peltula capensis; South Africa), Sinocapsa ellipsoidea sp. nov. (from Peccania cerebriformis, Austria), as well as the two new Nostocales species Komarekiella gloeocapsoidea sp. nov. (from Gonohymenia sp., Czechia) and Komarekiella globosa sp. nov. (from Lichinella cribellifera, Canary Islands, Spain). Our study highlights the role of cyanolichens acting as a key in untangling cyanobacterial taxonomy and diversity. With this study, we hope to stimulate further research on photobionts, especially of rare cyanolichens.
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Affiliation(s)
- Patrick Jung
- Department of Integrative Biotechnology, University of Applied Sciences Kaiserslautern, Pirmasens, Germany
| | - Katharina Brust
- Ecology Group, Faculty of Biology, University of Kaiserslautern, Kaiserslautern, Germany
| | - Matthias Schultz
- Institute for Plant Science and Microbiology, Herbarium Hamburgense, University of Hamburg, Hamburg, Germany
| | - Burkhard Büdel
- Faculty of Biology, University of Kaiserslautern, Kaiserslautern, Germany
| | - Antje Donner
- Faculty of Biology, University of Kaiserslautern, Kaiserslautern, Germany
| | - Michael Lakatos
- Department of Integrative Biotechnology, University of Applied Sciences Kaiserslautern, Pirmasens, Germany
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19
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Meier-Kolthoff JP, Carbasse JS, Peinado-Olarte RL, Göker M. TYGS and LPSN: a database tandem for fast and reliable genome-based classification and nomenclature of prokaryotes. Nucleic Acids Res 2021; 50:D801-D807. [PMID: 34634793 PMCID: PMC8728197 DOI: 10.1093/nar/gkab902] [Citation(s) in RCA: 780] [Impact Index Per Article: 260.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/18/2021] [Accepted: 09/22/2021] [Indexed: 01/04/2023] Open
Abstract
Microbial systematics is heavily influenced by genome-based methods and challenged by an ever increasing number of taxon names and associated sequences in public data repositories. This poses a challenge for database systems, particularly since it is obviously advantageous if such data are based on a globally recognized approach to manage names, such as the International Code of Nomenclature of Prokaryotes. The amount of data can only be handled if accurate and reliable high-throughput platforms are available that are able to both comply with this demand and to keep track of all changes in an efficient and flexible way. The List of Prokaryotic names with Standing in Nomenclature (LPSN) is an expert-curated authoritative resource for prokaryotic nomenclature and is available at https://lpsn.dsmz.de. The Type (Strain) Genome Server (TYGS) is a high-throughput platform for accurate genome-based taxonomy and is available at https://tygs.dsmz.de. We here present important updates of these two previously introduced, heavily interconnected platforms for taxonomic nomenclature and classification, including new high-level facilities providing access to bioinformatic algorithms, a considerable expansion of the database content, and new ways to easily access the data.
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Affiliation(s)
- Jan P Meier-Kolthoff
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Department of Bioinformatics and Databases, Inhoffenstrasse 7B, 38124 Braunschweig, Germany
| | - Joaquim Sardà Carbasse
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Department of Bioinformatics and Databases, Inhoffenstrasse 7B, 38124 Braunschweig, Germany
| | - Rosa L Peinado-Olarte
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Department of Bioinformatics and Databases, Inhoffenstrasse 7B, 38124 Braunschweig, Germany
| | - Markus Göker
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Department of Bioinformatics and Databases, Inhoffenstrasse 7B, 38124 Braunschweig, Germany
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20
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Abstract
The status Candidatus was introduced to bacterial taxonomy in the 1990s to accommodate uncultured taxa defined by analyses of DNA sequences. Here I review the strengths, weaknesses, opportunities and threats (SWOT) associated with the status Candidatus in the light of a quarter century of use, twinned with recent developments in bacterial taxonomy and sequence-based taxonomic discovery. Despite ambiguities as to its scope, philosophical objections to its use and practical problems in implementation, the status Candidatus has now been applied to over 1000 taxa and has been widely adopted by journals and databases. Although lacking priority under the International Code for Nomenclature of Prokaryotes, many Candidatus names have already achieved de facto standing in the academic literature and in databases via description of a taxon in a peer-reviewed publication, alongside deposition of a genome sequence and there is a clear path to valid publication of such names on culture. Continued and increased use of Candidatus names provides an alternative to the potential upheaval that might accompany creation of a new additional code of nomenclature and provides a ready solution to the urgent challenge of naming many thousands of newly discovered but uncultured species.
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Affiliation(s)
- Mark J Pallen
- University of East Anglia, Norwich Research Park, Norwich, UK.,Quadram Institute Bioscience, Norwich Research Park, Norwich, UK.,School of Veterinary Medicine, University of Surrey, Guildford, Surrey, UK
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21
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Jung P, D’Agostino PM, Brust K, Büdel B, Lakatos M. Final Destination? Pinpointing Hyella disjuncta sp. nov. PCC 6712 (Cyanobacteria) Based on Taxonomic Aspects, Multicellularity, Nitrogen Fixation and Biosynthetic Gene Clusters. Life (Basel) 2021; 11:916. [PMID: 34575065 PMCID: PMC8472315 DOI: 10.3390/life11090916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/25/2021] [Accepted: 08/30/2021] [Indexed: 11/16/2022] Open
Abstract
Unicellular cyanobacteria inhabit a wide range of ecosytems and can be found throughout the phylum offering space for taxonomic confusion. One example is strain PCC 6712 that was described as Chlorogloea sp. (Nostocales) and later assigned to the genus Chroococcidiopsis (Chroococcidiopsidales). We now show that this strain belongs to the order Pleurocapsales and term it Hyella disjuncta based on morphology, genome analyses and 16S-23S ITS rRNA phylogeny. Genomic analysis indicated that H. disjuncta PCC 6712 shared about 44.7% orthologue genes with its closest relative H. patelloides. Furthermore, 12 cryptic biosynthetic gene clusters (BGCs) with potential bioactivity, such as a mycosporine-like amino acid BGC, were detected. Interestingly, the full set of nitrogen fixation genes was found in H. disjuncta PCC 6712 despite its inability to grow on nitrogen-free medium. A comparison of genes responsible for multicellularity was performed, indicating that most of these genes were present and related to those found in other cyanobacterial orders. This is in contrast to the formation of pseudofilaments-a main feature of the genus Hyella-which is weakly expressed in H. disjuncta PCC 6712 but prominent in Hyella patelloides LEGE 07179. Thus, our study pinpoints crucial but hidden aspects of polyphasic cyanobacterial taxonomy.
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Affiliation(s)
- Patrick Jung
- Department of Integrative Biotechnology, University of Applied Sciences Kaiserslautern, Carl-Schurz-Str. 10–16, 66953 Pirmasens, Germany;
| | - Paul M. D’Agostino
- Department of Technical Biochemistry, Technical University of Dresden, Bergstr. 66, 01069 Dresden, Germany;
| | - Katharina Brust
- Department of Ecology, University of Kaiserslautern, Erwin Schrödinger Str. 14, 67663 Kaiserslautern, Germany;
| | - Burkhard Büdel
- Department of Plant Ecology and Systematics, University of Kaiserslautern, Erwin-Schrödinger Str. 52, 67663 Kaiserslautern, Germany;
| | - Michael Lakatos
- Department of Integrative Biotechnology, University of Applied Sciences Kaiserslautern, Carl-Schurz-Str. 10–16, 66953 Pirmasens, Germany;
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22
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Sutcliffe I, Rosselló-Móra R, Trujillo M. Addressing the sublime scale of the microbial world: reconciling an appreciation of microbial diversity with the need to describe species. New Microbes New Infect 2021; 43:100931. [PMID: 34484799 PMCID: PMC8408622 DOI: 10.1016/j.nmni.2021.100931] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 07/07/2021] [Accepted: 08/03/2021] [Indexed: 12/22/2022] Open
Abstract
There are fewer than 20,000 prokaryotic species with validly published names, meaning >99% of a reasonable estimate of microbial diversity remains formally unnamed. Here we explore the damaging consequences of the current practice in which each new species is described in a standardized publication, most typically a 'single strain species description'. This approach is both an impediment to scaling up progress in naming the microbial world and also a significant factor in the poor reputation of the discipline of microbial taxonomy. We conclude that significant changes in author habits are needed and make constructive suggestions as to how author practice should adapt.
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Affiliation(s)
- I.C. Sutcliffe
- Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - R. Rosselló-Móra
- Grup de Microbiologia Marina, IMEDEA (CSIC-UIB), C/Miquel Marques 21, 07190, Esporles, Illes Balears, Spain
| | - M.E. Trujillo
- Dpto. Microbiología y Genética, University of Salamanca, 37007, Salamanca, Spain
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23
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Jung P, Azua-Bustos A, Gonzalez-Silva C, Mikhailyuk T, Zabicki D, Holzinger A, Lakatos M, Büdel B. Emendation of the Coccoid Cyanobacterial Genus Gloeocapsopsis and Description of the New Species Gloeocapsopsis diffluens sp. nov. and Gloeocapsopsis dulcis sp. nov. Isolated From the Coastal Range of the Atacama Desert (Chile). Front Microbiol 2021; 12:671742. [PMID: 34305839 PMCID: PMC8295473 DOI: 10.3389/fmicb.2021.671742] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 05/27/2021] [Indexed: 11/24/2022] Open
Abstract
The taxonomy of coccoid cyanobacteria, such as Chroococcidiopsis, Pleurocapsa, Chroococcus, Gloeothece, Gloeocapsa, Gloeocapsopsis, and the related recent genera Sinocapsa and Aliterella, can easily be intermixed when solely compared on a morphological basis. There is still little support on the taxonomic position of some of the addressed genera, as genetic information is available only for a fraction of species that have been described solely on morphology. Modern polyphasic approaches that combine classic morphological investigations with DNA-based molecular analyses and the evaluation of ecological properties can disentangle these easily confusable unicellular genera. By using such an approach, we present here the formal description of two novel unicellular cyanobacterial species that inhabit the Coastal Range of the Atacama Desert, Gloeocapsopsis dulcis (first reported as Gloeocapsopsis AAB1) and Gloeocapsopsis diffluens. Both species could be clearly separated from previously reported species by 16S rRNA and 16S–23S ITS gene sequencing, the resulting secondary structures, p-distance analyses of the 16S–23S ITS, and morphology. For avoiding further confusions emendation of the genus Gloeocapsopsis as well as epitypification of the type species Gloeocapsopsis crepidinum based on the strain LEGE06123 were conducted.
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Affiliation(s)
- Patrick Jung
- University of Applied Sciences Kaiserslautern, Pirmasens, Germany
| | - Armando Azua-Bustos
- Centro de Astrobiología (CSIC-INTA), Madrid, Spain.,Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Santiago, Chile
| | | | - Tatiana Mikhailyuk
- M. G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Daniel Zabicki
- University of Applied Sciences Kaiserslautern, Pirmasens, Germany
| | | | - Michael Lakatos
- University of Applied Sciences Kaiserslautern, Pirmasens, Germany
| | - Burkhard Büdel
- Technical University of Kaiserslautern, Kaiserslautern, Germany
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24
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Hugenholtz P, Chuvochina M, Oren A, Parks DH, Soo RM. Prokaryotic taxonomy and nomenclature in the age of big sequence data. THE ISME JOURNAL 2021; 15:1879-1892. [PMID: 33824426 PMCID: PMC8245423 DOI: 10.1038/s41396-021-00941-x] [Citation(s) in RCA: 84] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 02/09/2021] [Accepted: 02/11/2021] [Indexed: 02/01/2023]
Abstract
The classification of life forms into a hierarchical system (taxonomy) and the application of names to this hierarchy (nomenclature) is at a turning point in microbiology. The unprecedented availability of genome sequences means that a taxonomy can be built upon a comprehensive evolutionary framework, a longstanding goal of taxonomists. However, there is resistance to adopting a single framework to preserve taxonomic freedom, and ever increasing numbers of genomes derived from uncultured prokaryotes threaten to overwhelm current nomenclatural practices, which are based on characterised isolates. The challenge ahead then is to reach a consensus on the taxonomic framework and to adapt and scale the existing nomenclatural code, or create a new code, to systematically incorporate uncultured taxa into the chosen framework.
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Affiliation(s)
- Philip Hugenholtz
- grid.1003.20000 0000 9320 7537Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD Australia
| | - Maria Chuvochina
- grid.1003.20000 0000 9320 7537Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD Australia
| | - Aharon Oren
- grid.9619.70000 0004 1937 0538Department of Plant and Environmental Sciences, The Alexander Silberman Institute of Life Sciences, The Edmond J. Safra campus, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Donovan H. Parks
- grid.1003.20000 0000 9320 7537Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD Australia
| | - Rochelle M. Soo
- grid.1003.20000 0000 9320 7537Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD Australia
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Arumugam K, Bessarab I, Haryono MAS, Liu X, Zuniga-Montanez RE, Roy S, Qiu G, Drautz-Moses DI, Law YY, Wuertz S, Lauro FM, Huson DH, Williams RBH. Recovery of complete genomes and non-chromosomal replicons from activated sludge enrichment microbial communities with long read metagenome sequencing. NPJ Biofilms Microbiomes 2021; 7:23. [PMID: 33727564 PMCID: PMC7966762 DOI: 10.1038/s41522-021-00196-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 02/12/2021] [Indexed: 01/31/2023] Open
Abstract
New long read sequencing technologies offer huge potential for effective recovery of complete, closed genomes from complex microbial communities. Using long read data (ONT MinION) obtained from an ensemble of activated sludge enrichment bioreactors we recover 22 closed or complete genomes of community members, including several species known to play key functional roles in wastewater bioprocesses, specifically microbes known to exhibit the polyphosphate- and glycogen-accumulating organism phenotypes (namely Candidatus Accumulibacter and Dechloromonas, and Micropruina, Defluviicoccus and Candidatus Contendobacter, respectively), and filamentous bacteria (Thiothrix) associated with the formation and stability of activated sludge flocs. Additionally we demonstrate the recovery of close to 100 circularised plasmids, phages and small microbial genomes from these microbial communities using long read assembled sequence. We describe methods for validating long read assembled genomes using their counterpart short read metagenome-assembled genomes, and assess the influence of different correction procedures on genome quality and predicted gene quality. Our findings establish the feasibility of performing long read metagenome-assembled genome recovery for both chromosomal and non-chromosomal replicons, and demonstrate the value of parallel sampling of moderately complex enrichment communities to obtaining high quality reference genomes of key functional species relevant for wastewater bioprocesses.
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Affiliation(s)
- Krithika Arumugam
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Irina Bessarab
- Singapore Centre for Environmental Life Sciences Engineering, National University of Singapore, Singapore, Singapore
| | - Mindia A S Haryono
- Singapore Centre for Environmental Life Sciences Engineering, National University of Singapore, Singapore, Singapore
| | - Xianghui Liu
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Rogelio E Zuniga-Montanez
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- Department of Civil and Environmental Engineering, One Shields Avenue, University of California, Davis, CA, USA
| | - Samarpita Roy
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Guanglei Qiu
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- School of Environment and Energy, South China University of Technology, Guangzhou, China
| | - Daniela I Drautz-Moses
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Ying Yu Law
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Stefan Wuertz
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, Singapore
| | - Federico M Lauro
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- Asian School of the Environment, Nanyang Technological University, Singapore, Singapore
| | - Daniel H Huson
- Institute for Bioinformatics and Medical Informatics, University of Tübingen, Tübingen, Germany
- Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Rohan B H Williams
- Singapore Centre for Environmental Life Sciences Engineering, National University of Singapore, Singapore, Singapore.
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Filling the Gaps in the Cyanobacterial Tree of Life-Metagenome Analysis of Stigonema ocellatum DSM 106950, Chlorogloea purpurea SAG 13.99 and Gomphosphaeria aponina DSM 107014. Genes (Basel) 2021; 12:genes12030389. [PMID: 33803228 PMCID: PMC8001431 DOI: 10.3390/genes12030389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 02/18/2021] [Accepted: 03/03/2021] [Indexed: 12/26/2022] Open
Abstract
Cyanobacteria represent one of the most important and diverse lineages of prokaryotes with an unparalleled morphological diversity ranging from unicellular cocci and characteristic colony-formers to multicellular filamentous strains with different cell types. Sequencing of more than 1200 available reference genomes was mainly driven by their ecological relevance (Prochlorococcus, Synechococcus), toxicity (Microcystis) and the availability of axenic strains. In the current study three slowly growing non-axenic cyanobacteria with a distant phylogenetic positioning were selected for metagenome sequencing in order to (i) investigate their genomes and to (ii) uncover the diversity of associated heterotrophs. High-throughput Illumina sequencing, metagenomic assembly and binning allowed us to establish nearly complete high-quality draft genomes of all three cyanobacteria and to determine their phylogenetic position. The cyanosphere of the limnic isolates comprises up to 40 heterotrophic bacteria that likely coexisted for several decades, and it is dominated by Alphaproteobacteria and Bacteriodetes. The diagnostic marker protein RpoB ensured in combination with our novel taxonomic assessment via BLASTN-dependent text-mining a reliable classification of the metagenome assembled genomes (MAGs). The detection of one new family and more than a dozen genera of uncultivated heterotrophic bacteria illustrates that non-axenic cyanobacteria are treasure troves of hidden microbial diversity.
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Sanford RA, Lloyd KG, Konstantinidis KT, Löffler FE. Microbial Taxonomy Run Amok. Trends Microbiol 2021; 29:394-404. [PMID: 33546975 DOI: 10.1016/j.tim.2020.12.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 12/20/2020] [Accepted: 12/22/2020] [Indexed: 11/28/2022]
Abstract
DNA sequencing has led to an explosion in discovery of microbial phylogenetic novelty, especially that represented by uncultivated taxa, to which the traditional system of prokaryotic taxonomy has not adapted. A lack of expansion of the International Code of Nomenclature of Prokaryotes (ICNP, 'the Code') to effectively capture this information has created a 'wild west' situation where names are published or appear in popular reference databases without further verification or validation. The rapid propagation of variant and questionable naming methods has led to widespread confusion and undermines prior accomplishments. We exemplify inconsistencies that have arisen from this practice and endanger the interoperability of scientific findings. The immediate solution to this problem is to develop and adopt universal best practices that are accepted by expert researchers, major publishers, the International Committee on Systematics of Prokaryotes (ICSP), and international microbiological societies.
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Affiliation(s)
- Robert A Sanford
- Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Karen G Lloyd
- Department of Microbiology, University of Tennessee, Knoxville, TN 37996, USA
| | - Konstantinos T Konstantinidis
- School of Civil and Environmental Engineering and School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Frank E Löffler
- Department of Microbiology, University of Tennessee, Knoxville, TN 37996, USA; Center for Environmental Biotechnology, University of Tennessee, Knoxville, TN 37996, USA; Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, USA; Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, TN 37996, USA; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
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28
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Borel N, Greub G. International Committee on Systematics of Prokaryotes (ICSP) Subcommittee on the taxonomy of Chlamydiae, minutes of the closed meeting, 10 September 2020, via Zoom. Int J Syst Evol Microbiol 2021; 71. [PMID: 33332256 DOI: 10.1099/ijsem.0.004620] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Nicole Borel
- Institute of Veterinary Pathology, Department of Pathobiology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 268, CH-8057 Zurich, Switzerland
| | - Gilbert Greub
- Institute of Microbiology, University of Lausanne, Bugnon 48, CH-1011 Lausanne, Switzerland
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29
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Oren A, Arahal DR, Rosselló-Móra R, Sutcliffe IC, Moore ERB. Preparing a revision of the International Code of Nomenclature of Prokaryotes. Int J Syst Evol Microbiol 2020; 71. [PMID: 33300858 DOI: 10.1099/ijsem.0.004598] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The Editorial Board of the International Code of Nomenclature of Prokaryotes here explains the proposed procedure towards the production of the next revision of the Prokaryotic Code, to include public discussion of a draft version, to be prepared by the editors, followed by balloting of the members of the International Committee on Systematics of Prokaryotes.
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Affiliation(s)
- Aharon Oren
- Institute of Life Sciences, The Hebrew University of Jerusalem, The Edmond J. Safra Campus, 9190401 Jerusalem, Israel
| | - David R Arahal
- Departamento de Microbiología y Ecología, Edificio de Investigación, Campus de Burjassot, Universidad de Valencia, 46100 Burjassot (Valencia), Spain
| | - Ramon Rosselló-Móra
- Grup de Microbiologia Marina, IMEDEA (CSIC-UIB), C/Miquel Marques 21, 07190 Esporles, Illes Balears, Spain
| | - Iain C Sutcliffe
- Faculty of Health & Life Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
| | - Edward R B Moore
- Department of Infectious Disease, Institute for Biomedicine, Sahlgrenska Academy, University of Gothenburg, P.O. Box 7193, SE-402 34 Göteborg, Sweden
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Pallen MJ, Telatin A, Oren A. The Next Million Names for Archaea and Bacteria. Trends Microbiol 2020; 29:289-298. [PMID: 33288384 DOI: 10.1016/j.tim.2020.10.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 01/12/2023]
Abstract
Latin binomials, popularised in the 18th century by the Swedish naturalist Linnaeus, have stood the test of time in providing a stable, clear, and memorable system of nomenclature across biology. However, relentless and ever-deeper exploration and analysis of the microbial world has created an urgent need for huge numbers of new names for Archaea and Bacteria. Manual creation of such names remains difficult and slow and typically relies on expert-driven nomenclatural quality control. Keen to ensure that the legacy of Linnaeus lives on in the age of microbial genomics and metagenomics, we propose an automated approach, employing combinatorial concatenation of roots from Latin and Greek to create linguistically correct names for genera and species that can be used off the shelf as needed. As proof of principle, we document over a million new names for Bacteria and Archaea. We are confident that our approach provides a road map for how to create new names for decades to come.
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Affiliation(s)
- Mark J Pallen
- Quadram Institute Bioscience, Norwich Research Park, Norwich, UK; School of Veterinary Medicine, University of Surrey, Guildford, Surrey, UK; University of East Anglia, Norwich Research Park, Norwich, UK.
| | - Andrea Telatin
- Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
| | - Aharon Oren
- The Institute of Life Sciences, Edmond J. Safra Campus, The Hebrew University of Jerusalem, Jerusalem, Israel
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