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Single missense mutations in Vi capsule synthesis genes confer hypervirulence to Salmonella Typhi

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  • Gi Young Lee

    (Cornell University College of Veterinary Medicine)

  • Jeongmin Song

    (Cornell University College of Veterinary Medicine)

Abstract

Many bacterial pathogens, including the human exclusive pathogen Salmonella Typhi, express capsular polysaccharides as a crucial virulence factor. Here, through S. Typhi whole genome sequence analyses and functional studies, we found a list of single point mutations that make S. Typhi hypervirulent. We discovered a single point mutation in the Vi biosynthesis enzymes that control Vi polymerization or acetylation is enough to result in different capsule variants of S. Typhi. All variant strains are pathogenic, but the hyper Vi capsule variants are particularly hypervirulent, as demonstrated by the high morbidity and mortality rates observed in infected mice. The hypo Vi capsule variants have primarily been identified in Africa, whereas the hyper Vi capsule variants are distributed worldwide. Collectively, these studies increase awareness about the existence of different capsule variants of S. Typhi, establish a solid foundation for numerous future studies on S. Typhi capsule variants, and offer valuable insights into strategies to combat capsulated bacteria.

Suggested Citation

  • Gi Young Lee & Jeongmin Song, 2024. "Single missense mutations in Vi capsule synthesis genes confer hypervirulence to Salmonella Typhi," Nature Communications, Nature, vol. 15(1), pages 1-15, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49590-6
    DOI: 10.1038/s41467-024-49590-6
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