Identification of novel pneumolysin alleles from paediatric carriage isolates of Streptococcus pneumoniae

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J M C Jefferies1,2, A S Tocheva2, H Rubery3

  • 1Health Protection Agency South East Regional Microbiology Laboratory, Southampton University Hospitals NHS Trust, Southampton SO16 6YD, UK.

Journal of Medical Microbiology
|March 27, 2010
PubMed

Insights

Pneumolysin (Ply) is a key Streptococcus pneumoniae virulence factor. Researchers found genetic diversity in Ply, which is crucial for developing effective pneumococcal vaccines.

Area of Science:

  • Microbiology
  • Immunology
  • Vaccinology

Background:

  • Pneumolysin (Ply) is a significant virulence factor produced by all Streptococcus pneumoniae strains.
  • Ply toxoids are being evaluated as potential vaccine candidates against pneumococcal infections.

Purpose of the Study:

  • To investigate the genetic diversity of pneumolysin (Ply) in nasopharyngeal isolates of Streptococcus pneumoniae.
  • To assess the implications of Ply diversity for the development of Ply-based vaccines.

Main Methods:

  • Characterization of 194 nasopharyngeal pneumococcal isolates using serotyping and multilocus sequence typing (MLST).
  • Identification and analysis of pneumolysin (Ply) protein alleles through sequencing.

Main Results:

  • Eight distinct Ply protein alleles were identified among the isolates, with four being novel.
  • Novel Ply alleles exhibited variations at 10 amino acid positions.
  • A strong correlation was observed between Ply protein alleles and MLST types.

Conclusions:

  • Significant genetic diversity exists within the pneumolysin protein among Streptococcus pneumoniae.
  • The identified Ply variants and their correlation with MLST necessitate consideration in the design of future pneumococcal vaccines.
  • Amino acid variations in Ply may impact the immunogenicity of vaccines, influencing their efficacy.

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