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Updated: Jun 17, 2025
Author Spotlight: Advancing Syphilis Research — Innovations in Treponema pallidum Cultivation and Genetic Engineering
Published on: January 24, 2025
Bright New Resources for Syphilis Research: Genetically Encoded Fluorescent Tags for Treponema pallidum and Sf1Ep
Linda Grillová1, Emily Romeis2, Nicole A P Lieberman3
1Parasites and Microbes Programme, Wellcome Sanger Institute, Hinxton, UK.
Abstract:
The recently discovered methodologies to cultivate and genetically manipulate Treponema pallidum subsp. pallidum (T. pallidum) have significantly helped syphilis research, allowing the in vitro evaluation of antibiotic efficacy, performance of controlled studies to assess differential treponemal gene expression, and generation of loss-of-function mutants to evaluate the contribution of specific genetic loci to T. pallidum virulence. Building on this progress, we engineered the T. pallidum SS14 strain to express a red-shifted green fluorescent protein (GFP) and Sf1Ep cells to express mCherry and blue fluorescent protein (BFP) for enhanced visualization. These new resources improve microscopy- and cell sorting-based applications for T. pallidum, better capturing the physical interaction between the host and pathogen, among other possibilities. Continued efforts to develop and share new tools and resources are required to help our overall knowledge of T. pallidum biology and syphilis pathogenesis reach that of other bacterial pathogens, including spirochetes.
Insights
New fluorescent tools aid syphilis research by enabling better visualization of Treponema pallidum (T. pallidum) interactions with host cells. This advances understanding of syphilis pathogenesis and bacterial virulence.
Area of Science:
- Microbiology
- Infectious Diseases
- Molecular Biology
Background:
- Recent advances in cultivating and genetically manipulating Treponema pallidum subsp. pallidum (T. pallidum) have accelerated syphilis research.
- Existing methodologies allow in vitro antibiotic efficacy testing, gene expression studies, and virulence factor analysis through loss-of-function mutants.
Purpose of the Study:
- To engineer T. pallidum and host cells with fluorescent proteins for enhanced visualization.
- To improve microscopy and cell sorting applications for studying host-pathogen interactions in syphilis.
Main Methods:
- Engineered the T. pallidum SS14 strain to express red-shifted green fluorescent protein (GFP).
- Engineered Sf1Ep cells to express mCherry and blue fluorescent protein (BFP).
Main Results:
- Developed novel fluorescently tagged T. pallidum and host cells.
- These tools enhance visualization capabilities for microscopy and cell sorting applications.
- Improved ability to capture physical interactions between T. pallidum and host cells.
Conclusions:
- The developed fluorescent tools represent significant advancements for T. pallidum research.
- These resources facilitate a deeper understanding of syphilis pathogenesis and T. pallidum biology.
- Continued development of new tools is crucial for advancing spirochete research.
