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Related Concept Videos

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...
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 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...
Evolution of Microbial Genome01:08

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
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...
Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...

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Related Experiment Video

Updated: Jul 2, 2026

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing
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Published on: December 23, 2022

Genomic diversity within the Enterobacter cloacae complex.

Armand Paauw1, Martien P M Caspers, Frank H J Schuren

  • 1Department of Medical Microbiology, University Medical Centre Utrecht, Utrecht, The Netherlands.

Plos One
|August 22, 2008
PubMed
Summary

Genomic analysis reveals the Enterobacter cloacae complex divides into two distinct clades, improving species identification. This research redefines taxonomy for these nosocomial pathogens, offering novel markers for accurate classification.

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Area of Science:

  • Microbiology
  • Genomics
  • Taxonomy

Background:

  • The Enterobacter cloacae complex is a growing source of hospital-acquired infections.
  • Current methods for identifying E. cloacae complex isolates are unreliable and taxonomically challenging.

Purpose of the Study:

  • To develop a more accurate and reproducible method for identifying species within the E. cloacae complex.
  • To investigate the evolutionary and genetic structure of the E. cloacae complex.

Main Methods:

  • Multilocus sequence analysis (MLSA)
  • Comparative genomic hybridization using a mixed genome array

Main Results:

  • The E. cloacae complex is divided into two evolutionarily distinct clades.
  • Clade 1, containing Enterobacter hormaechei, is genetically homogeneous and prevalent in hospitals.
  • Clade 2 is older and more genetically diverse, comprising several subspecies.
  • Novel genetic markers were identified to differentiate between clades and clusters.

Conclusions:

  • Genomic data necessitates the redefinition of several previously classified E. cloacae complex subspecies.
  • The identified genetic markers will enable improved species identification within the complex.