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Overview of Archaea

Overview of Archaea

Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...

Diversity of Archaea I

Diversity of Archaea I

Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...

Diversity of Archaea II

Diversity of Archaea II

Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...

Diversity of Archaea III

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Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...

Microbial Classification System

Microbial Classification System

Classification is the process of organizing organisms into hierarchically inclusive groups based on their phenotypic similarities or evolutionary relationships. A species comprises one or more strains, and closely related species are grouped into genera. Genera are further classified into families, families into orders, orders into classes, and so forth, up to the domain level, which is the broadest taxonomic rank derived from a combination of phenotypic and genotypic data.The nomenclature of...

Diversity of Archaea IV

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Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...

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Hybrid De Novo Genome Assembly for the Generation of Complete Genomes of Urinary Bacteria using Short- and Long-read Sequencing Technologies

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Roadmap for naming uncultivated Archaea and Bacteria.

Alison E Murray¹, John Freudenstein², Simonetta Gribaldo³

¹Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, USA. alison.murray@dri.edu.

Nature Microbiology

|June 10, 2020

Summary

New genome assembly methods (SAGs and MAGs) enable discovery of uncultivated microbes. This consensus statement proposes solutions for naming these microorganisms under the International Code of Nomenclature of Prokaryotes (ICNP).

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Area of Science:

Microbiology
Genomics
Taxonomy

Background:

Single-amplified genomes (SAGs) and metagenome-assembled genomes (MAGs) have increased microbial discoveries.
Current nomenclature rules (ICNP) do not accommodate uncultivated organisms, as they require cultured 'type material'.

Purpose of the Study:

To address the challenge of naming uncultivated microorganisms discovered through genome assembly.
To propose actionable solutions for establishing nomenclature guidelines for microbial taxa lacking cultures.

Main Methods:

Consensus-based discussion and proposal of two distinct nomenclatural pathways.
Analysis of existing International Code of Nomenclature of Prokaryotes (ICNP) limitations.

Main Results:

Two potential solutions are presented: modifying the ICNP to accept DNA sequences as type material, or creating a new code for uncultivated Archaea and Bacteria.
The need for immediate community action to establish clear nomenclature rules is emphasized.

Conclusions:

Consistent rules are essential for clear and stable communication of microbial diversity.
Adopting DNA sequences or developing a dedicated code are viable paths to naming uncultivated microbes.