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Expanded Functional Characterization and Optimization of Protein Expression in Treponema denticola Shuttle Plasmids
M Paula Goetting-Minesky1, Valentina Godovikova1, Prakaimuk Saraithong1
1Department of Biologic and Materials Sciences and Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA.
Molecular Oral Microbiology
|November 28, 2025
Summary
Optimized shuttle plasmids enhance genetic studies of Treponema denticola, a key oral pathogen. This refined system allows for better control of gene expression, aiding research into periodontal disease mechanisms.
Area of Science:
- Microbiology
- Genetics
- Periodontal Disease Research
Background:
- Oral spirochetes, including Treponema denticola, are implicated in periodontal disease pathogenesis.
- T. denticola is a model organism for studying oral spirochete behavior and host interactions.
- Existing genetic tools for T. denticola have limitations, hindering rigorous analysis.
Purpose of the Study:
- To optimize the Escherichia coli-T. denticola shuttle plasmid system for enhanced genetic manipulation of T. denticola.
- To characterize promoter-gene constructs for genetic complementation and develop an inducible expression system.
- To improve the utility of shuttle plasmids for studying Treponema physiology and behavior.
Main Methods:
- Minimization of shuttle plasmid size.
- Characterization of various promoter-gene constructs for genetic complementation.
- Development and testing of the first inducible expression system for T. denticola.
Main Results:
- Demonstrated enhanced transformation efficiency with a synthetic shuttle plasmid.
- Reported optimization of the shuttle plasmid system, including size reduction.
- Characterized promoter activity and established an inducible system for controlled gene expression in Treponema.
Conclusions:
- The refined T. denticola shuttle plasmid system significantly expands research capabilities.
- Precise pairing of promoters and genes is crucial for optimal protein expression.
- This work facilitates future studies on Treponema physiology, behavior, and role in oral diseases.
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