Preparation and Induction of Borrelia burgdorferi Cultures for Viral Particle Production
JoVE Encyclopedia of Experiments
Microbiology
0 views • 3:17 min • September 26th, 2025
Begin with a culture of a genetically modified strain of Borrelia burgdorferi, a pathogenic bacterium.
This strain carries dormant bacteriophage DNA integrated into its genome, which has been engineered to include a target gene conferring antibiotic resistance.
Add the corresponding antibiotic and incubate the culture. The antibiotic resistance gene expresses a protein that inhibits the antibiotic, ensuring only bacteria harboring the gene proliferate.
Once the culture reaches the desired density, centrifuge the cells to pellet them and discard the supernatant.
Resuspend the pellet, introduce a chemical inducer, and incubate to induce DNA damage.
The resulting DNA repair response excises the bacteriophage DNA, initiating its replication, expression of structural proteins, and assembly of new virions carrying the antibiotic-resistance gene.
Centrifuge the culture again, discard the supernatant, and resuspend the cells in a fresh medium.
The bacterial cells containing mature virions are ready for further downstream applications.
Inoculate 150 microliters of the appropriate Borrelia burgdorferi clone into 15 milliliters of BSK in tightly-capped sterile conical centrifuge tubes for the transduction protocol. Then, supplement the medium with the appropriate concentration of antibiotics or a combination of antibiotics for the selection and maintenance of heterologous DNA within the Borrelia burgdorferi clone and incubate the sample at 33 degrees Celsius. After the culture has grown up, centrifuge the appropriate volume of culture at 6,000 G for 10 minutes.
After decanting the supernatant, resuspend the pellet in four milliliters at fresh BSK and transfer the sample to the smallest sterile tube available to hold the sample with minimal head space. Then, add the appropriate amount of inducing agent to the recommended concentration based on a culture volume of four milliliters to induce phage production, cap the tube tightly, and mix thoroughly. Incubate the sample at 33 degrees Celsius for two to four hours.
Then, transfer the sample to a 15-milliliter centrifuge tube. Centrifuge the sample at 6,000 G for 10 minutes. After decanting the supernatant, resuspend the cell pellet in 15 milliliters of BSK.
Overview
This study details the process of culturing a genetically modified strain of Borrelia burgdorferi that carries engineered bacteriophage DNA. The methodology focuses on inducing antibiotic resistance and producing virions for downstream applications.
Key Study Components
Area of Science
- Microbiology
- Genetic Engineering
- Pathogen Research
Background
- Borrelia burgdorferi is a pathogenic bacterium responsible for Lyme disease.
- Genetic modification can enhance the study of bacterial behaviors and resistance mechanisms.
- Understanding antibiotic resistance is crucial for developing effective treatments.
- Bacteriophages can be utilized to manipulate bacterial genomes.
Purpose of Study
- To develop a method for producing antibiotic-resistant Borrelia burgdorferi.
- To explore the potential of bacteriophage DNA in genetic engineering.
- To prepare virions for further research applications.
Methods Used
- Culturing genetically modified Borrelia burgdorferi strains.
- Inducing antibiotic resistance through genetic engineering.
- Using chemical inducers to stimulate DNA damage and phage production.
- Centrifugation for cell pellet preparation and resuspension.
Main Results
- Successful induction of antibiotic resistance in Borrelia burgdorferi.
- Efficient production of virions carrying the antibiotic-resistance gene.
- Establishment of a reliable protocol for culturing and manipulating the bacterium.
- Preparation of bacterial cells for downstream applications.
Conclusions
- The study demonstrates a viable method for manipulating Borrelia burgdorferi.
- Findings contribute to understanding antibiotic resistance mechanisms.
- Future research can build on this methodology for further insights into pathogenic bacteria.
Frequently Asked Questions
Executive Industry Relevance
Genetic manipulation of Borrelia burgdorferi using phage-mediated delivery of antibiotic resistance genes enables precise control over bacterial populations for research and development. This approach supports early-stage target validation and mechanistic studies in infectious disease pipelines, providing a platform for evaluating genetic interventions and resistance mechanisms. The method enhances predictive confidence in downstream applications by ensuring only genetically defined clones are advanced.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables interrogation of gene function and pathway involvement in Borrelia burgdorferi.
- Supports biological de-risking by isolating genetically modified clones for mechanistic studies.
- Facilitates functional target validation through controlled genetic selection and induction.
Screening & Assay Development
- Prepares validated bacterial systems for use in genetic screening and compound evaluation workflows.
- Ensures assay reproducibility by selecting for antibiotic-resistant, genetically defined populations.
- Provides scalable protocols for generating consistent biological material for downstream assays.
Translational & Preclinical Research
- Enables continuity from genetic manipulation to preclinical model development in infectious disease research.
- Supports alignment with translational biomarker strategies by enabling precise genetic modifications.
- Reduces mechanistic ambiguity in preclinical studies through controlled genetic backgrounds.
Pipeline & Workflow Integration
This phage-mediated genetic manipulation method fits at the interface of early discovery and preclinical research, supporting workflows from hypothesis testing to lead identification in infectious disease programs.
- Discovery Biology: Facilitates hypothesis-driven genetic interrogation and pathway mapping in Borrelia burgdorferi.
- Screening: Provides reproducible, genetically defined bacterial populations for assay development and screening.
- Analytics: Enables quantitative selection of antibiotic-resistant clones, supporting robust comparative analyses.
- Translational Research: Bridges genetic manipulation with preclinical model readiness for infectious disease studies.
- Enterprise Reuse: Establishes a reusable protocol for generating genetically modified bacterial systems across projects.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic uncertainty in genetic studies.
- Operational Value: Standardizes genetic manipulation and selection workflows for reproducibility and scalability.
- Strategic Value: Improves go/no-go decision-making by enabling precise genetic control and selection.
- Portfolio Impact: Supports risk-adjusted prioritization of infectious disease targets and genetic interventions.
Implementation Considerations
- Requires expertise in bacterial genetics and phage biology.
- Needs access to sterile culture facilities and centrifugation equipment.
- Demands cross-team standardization of antibiotic selection and induction protocols.
- May require adaptation for different bacterial strains or genetic constructs.
- Dependent on validated chemical inducers and antibiotic concentrations for reproducibility.
Biopharma FAQs
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Last updated: 29 August 2026