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Related Concept Videos

Overview of Archaea01:29

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 II01:24

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 I01:30

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 III01:27

Diversity of Archaea III

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 environments.Morphological...
Diversity of Archaea IV01:29

Diversity of Archaea IV

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 thermal...
Viruses of Archaea01:29

Viruses of Archaea

Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...

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Related Experiment Video

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Establishing Stable Binary Cultures of Symbiotic Saccharibacteria from the Oral Cavity
07:32

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Published on: April 13, 2021

Archaea as emerging organisms in complex human microbiomes.

Bédis Dridi1, Didier Raoult, Michel Drancourt

  • 1Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, Université de la Méditerranée, Marseille, France.

Anaerobe
|March 23, 2011
PubMed
Summary
This summary is machine-generated.

Archaea, once thought to live only in extreme environments, are now known to inhabit the human microbiome. Research is ongoing to understand their role in human health and disease.

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Last Updated: Jun 3, 2026

Establishing Stable Binary Cultures of Symbiotic Saccharibacteria from the Oral Cavity
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Published on: April 13, 2021

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Published on: September 5, 2025

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11:22

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Published on: October 15, 2019

Area of Science:

  • Microbiology
  • Human Microbiome Research

Background:

  • Archaea were initially discovered in extreme environments, leading to the misconception of them being primitive organisms.
  • Subsequent research revealed Archaea inhabit diverse environments, including the human host, necessitating a re-evaluation of their ecological roles.

Purpose of the Study:

  • To review the current understanding of Archaea within the human microbiome.
  • To identify known and potential archaeal species associated with human mucosal surfaces.
  • To highlight the need for further research into the role of human-associated Archaea in health and disease.

Main Methods:

  • Literature review of existing studies on human-associated Archaea.
  • Analysis of culturing and molecular studies, including metagenomics, to detect Archaea in human samples.
  • Identification of key archaeal species found in oral, intestinal, and vaginal mucosae.

Main Results:

  • Three species of Archaea—Methanobrevibacter smithii, Methanosphaera stadtmanae, and Methanobrevibacter oralis—have been isolated from human mucosal sites.
  • Metagenomic analyses indicate the presence of additional, uncultured methanogenic and non-methanogenic Archaea in the human gut.
  • All currently identified culturable human Archaea are strict anaerobes.

Conclusions:

  • Archaea are a component of the human microbiome, found in various mucosal environments.
  • The pathogenic potential and specific roles of human-associated Archaea in health and disease require further investigation.
  • Future research should focus on culturing novel human Archaea and exploring their presence in additional tissues and disease states.