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Related Experiment Videos

Representational difference analysis identifies a strain-specific LPS biosynthesis locus in Bordetella spp.

B Middendorf1, R Gross

  • 1Lehrstuhl für Mikrobiologie, Theodor-Boveri-Institut Biozentrum der Universität Würzburg, Germany.

Molecular & General Genetics : MGG
|September 30, 1999
PubMed
Summary

Representational Difference Analysis identified novel DNA fragments specific to Bordetella bronchiseptica, revealing a unique lipopolysaccharide (LPS) biosynthesis locus absent in Bordetella pertussis.

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Area of Science:

  • Microbiology
  • Genetics
  • Immunology

Background:

  • Bordetella pertussis and B. bronchiseptica are closely related bacteria with distinct virulence.
  • Phylogenetic analysis reveals close relationships between B. bronchiseptica and B. parapertussis.

Purpose of the Study:

  • Identify genetic differences between B. pertussis and B. bronchiseptica.
  • Characterize a novel lipopolysaccharide (LPS) biosynthesis locus specific to B. bronchiseptica.

Main Methods:

  • Representational Difference Analysis (RDA) to identify specific DNA fragments.
  • Pulsed-field gel electrophoresis (PFGE) for fragment analysis.
  • Comparative genomic analysis across Bordetella species.

Main Results:

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  • 11 DNA fragments specific to B. pertussis or B. bronchiseptica were identified using RDA.
  • B. bronchiseptica-specific fragments hybridized with B. parapertussis DNA, indicating close phylogenetic ties.
  • A novel LPS biosynthesis locus, present in B. bronchiseptica and B. parapertussis but absent in B. pertussis, was identified.
  • A mutant lacking this locus showed altered LPS lacking O-specific side chains.

Conclusions:

  • RDA successfully identified strain-specific DNA fragments differentiating Bordetella species.
  • A novel LPS biosynthesis locus contributes to the distinct LPS structures observed in B. pertussis and B. bronchiseptica.
  • Understanding these genetic differences is crucial for comprehending Bordetella virulence and pathogenesis.