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rpoB sequence analysis as a novel basis for bacterial identification

C Mollet1, M Drancourt, D Raoult

  • 1Unité des Rickettsies CNRS UPRES-A 6020, Faculté de Médecine, Université de la Méditerranée, Marseilles, France.

Molecular Microbiology
|January 13, 1998
PubMed
Summary

The RNA polymerase beta-subunit encoding gene (rpoB) offers higher bacterial identification accuracy than 16S rRNA sequencing. This enhanced bacterial identification tool aids in resolving complex Enterobacteriaceae classifications.

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Area of Science:

  • Microbiology
  • Genetics
  • Bioinformatics

Background:

  • Bacterial genotypic identification commonly relies on 16S rRNA gene sequencing.
  • However, 16S rRNA gene variation is insufficient for confident species identification within certain bacterial taxa, including Enterobacteriaceae.

Purpose of the Study:

  • To evaluate the RNA polymerase beta-subunit encoding gene (rpoB) as a superior alternative for universal bacterial genotypic identification.
  • To assess the phylogenetic utility of rpoB sequences for Enterobacteriaceae classification.

Main Methods:

  • A database of partial rpoB gene sequences was generated for 14 Enterobacteriaceae species.
  • Intra- and interspecies sequence divergence of rpoB and 16S rRNA genes were compared using pairwise analyses.
  • Phylogenetic trees were constructed using rpoB sequences to analyze Enterobacteriaceae relationships.

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Main Results:

  • rpoB sequences exhibited significantly higher divergence levels between different bacterial strains compared to 16S rRNA genes.
  • rpoB sequence comparison accurately identified 20 clinical isolates to the correct enteric species.
  • Phylogenetic analysis using rpoB revealed the polyphyletic nature of the Klebsiella genus and provided trees more consistent with current Enterobacteriaceae classification.

Conclusions:

  • The rpoB gene is a powerful and highly discriminatory tool for bacterial identification, surpassing 16S rRNA in resolving closely related species.
  • rpoB sequence analysis offers improved phylogenetic insights into bacterial taxonomy, particularly for the Enterobacteriaceae family.
  • rpoB sequencing holds significant potential as a universal bacterial identification method.