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Related Experiment Videos

Were the original eubacteria thermophiles?

L Achenbach-Richter1, R Gupta, K O Stetter

  • 1Department of Genetics and Development, University of Illinois, Urbana 61801, USA.

Systematic and Applied Microbiology
|January 1, 1987
PubMed
Summary

Thermotoga maritima, a unique thermophilic eubacterium, exhibits deep phylogenetic branching and slow evolution. This suggests that all eubacteria may have originated from a thermophilic ancestor.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Extremophile Research

Background:

  • Thermotoga maritima is a highly thermophilic eubacterium with unique cell wall structure, lipid composition, and an unknown sheath.
  • It occupies a deep branching position in phylogenetic analyses based on ribosomal RNA sequences.

Purpose of the Study:

  • To investigate the phylogenetic position and evolutionary rate of Thermotoga maritima.
  • To infer the ancestral conditions of eubacteria based on the characteristics of deep-branching lineages.

Main Methods:

  • Phylogenetic analysis using ribosomal RNA sequences.
  • Comparative analysis of phenotypic traits (thermophily, cell wall, lipids) and evolutionary rates.

Main Results:

Keywords:
NASA Center JSCNASA Discipline ExobiologyNon-NASA Center

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  • Thermotoga maritima represents the deepest known branching eubacterial lineage.
  • This organism exhibits the slowest evolutionary rate among eubacterial lineages.
  • Other deep-branching lineages, like green non-sulfur bacteria, are also thermophilic and slowly evolving.

Conclusions:

  • The deep phylogenetic position and slow evolution of Thermotoga maritima provide insights into early bacterial evolution.
  • The shared thermophilic nature of deep-branching lineages strongly suggests an thermophilic origin for all eubacteria.