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Related Experiment Videos

A conserved DNA sequence is required for efficient gonococcal pilin antigenic variation

L A Wainwright1, K H Pritchard, H S Seifert

  • 1Department of Microbiology/Immunology, Northwestern University Medical School, Chicago, Illinois 60611.

Molecular Microbiology
|July 1, 1994
PubMed
Summary
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Neisseria gonorrhoeae uses DNA recombination to vary its pilus antigen. A specific DNA sequence, the Sma/Cla repeat, is crucial for this efficient pilin recombination process.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Neisseria gonorrhoeae exhibits antigenic variation in its pilus, a key factor in immune evasion.
  • Pilin sequence variation is mediated by homologous recombination between silent loci and the expression locus.

Purpose of the Study:

  • To investigate the role of the Sma/Cla repeat sequence in facilitating pilin recombination in Neisseria gonorrhoeae.
  • To develop and utilize a novel assay for monitoring pilin recombination.

Main Methods:

  • Development of a novel reverse transcriptase/polymerase chain reaction (RT-PCR) assay.
  • Analysis of pilin recombination in a Neisseria gonorrhoeae strain with the pilE Sma/Cla repeat deleted, using RT-PCR and phase variation analysis.

Main Results:

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  • Deletion of the Sma/Cla repeat from the pilE locus significantly decreased the rate of pilin recombination.
  • This finding indicates that the Sma/Cla repeat acts as a specialized site involved in efficient pilin recombination.

Conclusions:

  • The Sma/Cla repeat sequence plays a critical role in the efficiency of pilin recombination in Neisseria gonorrhoeae.
  • Understanding this mechanism provides insights into the genetic variability and immune evasion strategies of this pathogen.