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Pneumococcal Phasevarions Control Multiple Virulence Traits, Including Vaccine Candidate Expression.

Zachary N Phillips1, Claudia Trappetti2, Annelies Van Den Bergh1

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Streptococcus pneumoniae

Keywords:
Streptococcus pneumoniaeepigenetic regulationphase variationphasevarionpneumococcusvaccine

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Area of Science:

  • Microbiology
  • Vaccinology
  • Genetics

Background:

  • Streptococcus pneumoniae causes widespread bacterial illness globally.
  • Current vaccines target limited capsular serotypes, necessitating a universal approach.
  • Conserved protein antigens are key for a universal pneumococcal vaccine.

Purpose of the Study:

  • To investigate the role of the SpnIII phasevarion in pneumococcal pathobiology.
  • To determine if phase variation affects expression of conserved protein antigens.
  • To inform the rational design of a universal pneumococcal vaccine.

Main Methods:

  • Utilized locked strains expressing single methyltransferase specificities.
  • Assessed differences in clinically relevant traits such as survival and cell adherence/invasion.
  • Analyzed variations in the expression of proteinaceous vaccine candidates.

Main Results:

  • Phasevarion switching significantly impacts pneumococcal pathobiology.
  • Differences observed in survival, adherence, and invasion capabilities.
  • Expression of numerous potential vaccine antigens varies with phasevarion state.

Conclusions:

  • The SpnIII phasevarion influences S. pneumoniae virulence and antigen expression.
  • Phase variation complicates the selection of antigens for a universal vaccine.
  • This study guides the inclusion of stably expressed candidates for effective vaccine development.