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Streptococcus pneumoniae arginine synthesis genes promote growth and virulence in pneumococcal meningitis

Jurgen R Piet1, Madelijn Geldhoff, Barbera D C van Schaik

  • 1Department of Neurology, Center of Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, P.O. Box 22660, Amsterdam 1100 DD, the Netherlands.

The Journal of Infectious Diseases
|December 17, 2013
PubMed

Insights

Streptococcus pneumoniae arginine synthesis genes enhance bacterial growth and virulence in invasive infections like meningitis and pneumonia. These findings highlight a key factor in pneumococcal disease progression.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Genomics

Background:

  • Streptococcus pneumoniae (pneumococcus) is a significant cause of pneumonia, sepsis, and bacterial meningitis.
  • Understanding the genetic factors influencing pneumococcal virulence is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the role of pneumococcal arginine biosynthesis genes in the outcome of pneumococcal meningitis.
  • To determine the impact of these genes on bacterial growth and virulence in vivo.

Main Methods:

  • Clinical phenotype-based approach combined with whole-genome sequencing of Streptococcus pneumoniae.
  • In vitro growth assays using human blood and cerebrospinal fluid (CSF).
  • Murine models of meningitis and pneumonia to assess bacterial attenuation and clearance.

Main Results:

  • Pneumococcal strains with arginine biosynthesis genes exhibited increased growth in human blood and CSF.
  • Strains lacking these genes were attenuated in growth and cleared from lung, blood, and CSF in mouse models.
  • Arginine biosynthesis genes are associated with improved patient outcomes in pneumococcal meningitis.

Conclusions:

  • Streptococcus pneumoniae arginine synthesis genes are critical for promoting bacterial growth and virulence in invasive pneumococcal disease.
  • Targeting arginine biosynthesis pathways could be a potential therapeutic strategy against pneumococcal infections.
Keywords:
Streptococcus pneumoniaearginine synthesisbacterial meningitisvirulencewhole genome sequencing

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