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Updated: Jul 12, 2025

Phage-Mediated Genetic Manipulation of the Lyme Disease Spirochete Borrelia burgdorferi
Published on: September 28, 2022
Enhanced transformation efficiency in Treponema denticola enabled by SyngenicDNA-based plasmids lacking
Christopher D Johnston1, M Paula Goetting-Minesky2, Kelly Kennedy1
1Vaccine and Infection Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA.
Treponema denticola, a key oral pathogen, can now be genetically manipulated more efficiently. New tools, including a "SyngenicDNA" shuttle plasmid, overcome restriction-modification systems, enabling deeper study of this important bacterium.
Area of Science:
- Microbiology
- Genetics
- Oral Health
Background:
- Oral spirochetes, including Treponema denticola, are implicated in periodontal disease and oral squamous cell carcinoma.
- T. denticola is a crucial model organism for studying spirochetes due to its culturability and existing genetic manipulation systems.
- Previous work established improved transformation efficiency using an Escherichia coli-T. denticola shuttle plasmid for gene expression.
Purpose of the Study:
- To characterize T. denticola restriction-modification (R-M) systems.
- To develop a high-efficiency, R-M-silent shuttle plasmid for genetic manipulation of T. denticola.
- To optimize transformation efficiency and enable high-throughput genetic studies in T. denticola.
Main Methods:
- Characterization of Type I and Type II restriction-modification systems in T. denticola ATCC 35405 and ATCC 33520.
- Design and construction of a novel R-M-silent shuttle plasmid, termed "SyngenicDNA".
- Optimization of shuttle plasmid transformation efficiency and implementation of high-efficiency transposon mutagenesis.
Main Results:
- Identification of R-M systems in T. denticola strains, with ATCC 33520 possessing an additional Type I system.
- Development of the "SyngenicDNA" plasmid, resistant to all characterized T. denticola R-M systems, significantly improving transformation efficiency.
- Successful complementation of a T. denticola ΔfhbB mutant and demonstration of high-efficiency transposon mutagenesis using the new tools.
Conclusions:
- SyngenicDNA-based strategies and tools enhance genetic manipulation of T. denticola.
- These advancements facilitate further mechanistic studies of T. denticola physiology and its role in oral and other diseases.
- The developed tools are vital for understanding spirochete behavior in pathogens lacking facile genetic systems.
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