Metabolism and virulence in Neisseria meningitidis

Area of Science:

• Infection Biology
• Microbial Pathogenesis
• Molecular Epidemiology

Background:

• Neisseria meningitidis is a commensal bacterium that can cause life-threatening diseases like sepsis and meningitis.
• Distinguishing between commensal and invasive strains is challenging due to a lack of classical virulence genes.
• Molecular epidemiology suggests distinct genetic populations for carriage and invasive strains.

Purpose of the Study:

• To explore the role of core metabolic pathways in Neisseria meningitidis colonization and invasion.
• To investigate potential metabolic differences between hyperinvasive and carriage lineages.
• To assess in vitro growth differences between these two populations.

Main Methods:

• Review of genome-wide surveys focusing on metabolic pathways.
• Analysis of specific metabolic pathways: lactate metabolism, oxidative stress response, glutathione metabolism, and denitrification.
• In vitro growth assessment of strains from hyperinvasive and carriage lineages.

Main Results:

• Metabolic adaptation, termed nutritional virulence, is crucial for invasive capability.
• Specific pathways like lactate, oxidative stress, glutathione metabolism, and denitrification are linked to pathogenesis.
• Evidence suggests metabolic differences between hyperinvasive and carriage strains, with potential variations in regulatory genes for stress and amino acid metabolism.

Conclusions:

• Metabolic pathways, particularly those involved in nutrient exploitation and stress response, are critical determinants of Neisseria meningitidis virulence.
• Differences in metabolic regulation and gene expression likely underlie the distinct behaviors of carriage and hyperinvasive strains.
• Further research into these metabolic distinctions can inform strategies to combat invasive meningococcal disease.