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Comparison of the PF07598-Encoded Virulence-Modifying Proteins of L. interrogans and L. borgpetersenii
Dielson S Vieira1, Reetika Chaurasia1, Joseph M Vinetz1
1Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06510, USA.
Abstract:
Leptospirosis is an emerging infectious disease, with increasing frequency and severity of outbreaks, a changing epidemiology of populations at risk, and the emergence of new strains, serovars, serogroups, and species. Virulence-modifying (VM) proteins encoded by the PF07598 gene family are hypothesized to be Leptospira-secreted exotoxins that mediate the molecular and cellular pathogenesis of severe and fatal leptospirosis. If confirmed experimentally, this concept could revolutionize the treatment, diagnosis, prognosis, and vaccine-mediated prevention of leptospirosis by enabling a novel array of targeted interventions. VM proteins, as with other bacterial-secreted protein exotoxins, mediate their virulence effects by attaching to eukaryotic cells, competing with other microorganisms for limited resources in environmental niches, directly intoxicating target cells, and disrupting their function in the mammalian host. In contrast with the most pathogenic group of Lept ospira, particularly L. interrogans, whose genomes contain 12-15 PF07598 paralogs, strains of the livestock and human pathogen L. borgpetersenii have two PF07598 paralogs. Given the possible non-environmentally mediated transmission of some L. borgpetersenii strains and the much smaller number of VM proteins in this species, their role in infection and disease may well differ from other leptospiral species. Comparison of VM proteins from different clades of pathogenic Leptospira may deepen our understanding of leptospirosis's pathogenesis, leading to novel approaches to ameliorating Leptospira infection in humans and animals.
Insights
Virulence-modifying proteins are key to severe leptospirosis. Understanding these Leptospira exotoxins could lead to new treatments and vaccines for this emerging infectious disease.
Area of Science:
- Microbiology
- Infectious Diseases
- Pathogenesis
Background:
- Leptospirosis is an emerging infectious disease with increasing outbreaks and severity.
- Virulence-modifying (VM) proteins, encoded by the PF07598 gene family, are hypothesized Leptospira-secreted exotoxins.
- These VM proteins are implicated in the pathogenesis of severe and fatal leptospirosis.
Purpose of the Study:
- To investigate the role of VM proteins in Leptospira pathogenesis.
- To explore the potential of VM proteins as targets for novel interventions against leptospirosis.
- To compare VM proteins across different pathogenic Leptospira species to understand variations in disease mechanisms.
Main Methods:
- Comparative genomic analysis of PF07598 gene family paralogs in different Leptospira species (e.g., L. interrogans vs. L. borgpetersenii).
- Hypothesizing the function of VM proteins based on their characteristics as bacterial-secreted exotoxins.
- Analyzing the potential impact of VM protein variations on disease severity and transmission.
Main Results:
- Pathogenic Leptospira, such as L. interrogans, possess a higher number of PF07598 paralogs (12-15) compared to L. borgpetersenii (2).
- VM proteins are proposed to mediate virulence by interacting with eukaryotic cells and disrupting host functions.
- Differences in VM protein numbers may correlate with varying roles in infection and disease, potentially including non-environmental transmission.
Conclusions:
- VM proteins are critical virulence factors in Leptospira pathogenesis.
- Targeting VM proteins offers a promising strategy for developing new treatments, diagnostics, and vaccines for leptospirosis.
- Further research comparing VM proteins across Leptospira clades will enhance understanding and control of this zoonotic disease.
