Clonal isolation of chlamydia-infected cells using flow cytometry.

Area of Science:

• Microbiology
• Cell Biology
• Immunology

Background:

• Chlamydia species are obligate intracellular bacteria requiring specialized techniques for isolation and study.
• Traditional methods for cloning Chlamydia can be time-consuming and labor-intensive.
• Efficient cloning is crucial for understanding Chlamydia pathogenesis and developing therapeutics.

Purpose of the Study:

• To describe a novel, rapid, and efficient method for microbiological cloning of Chlamydia-infected cells.
• To utilize fluorescence-activated cell sorting (FACS) for the isolation of clonal Chlamydia populations.
• To validate the technique using various Chlamydia species and clinical isolates.

Main Methods:

• Employing the fluorescent lipid 6-((N-7-(-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)-hexanoyl)sphingosine (C6-NBD-cer) to label Chlamydia inclusions.
• Utilizing FACS to analyze and sort live Chlamydia-infected cells based on fluorescence.
• Culturing sorted cells to obtain clonal Chlamydia isolates.

Main Results:

• Successful labeling of Chlamydia inclusions with C6-NBD-cer, enabling identification by FACS.
• Demonstrated efficient sorting of individual Chlamydia-infected cells into culture wells.
• Achieved isolation of clonal populations from prototype strains (Chlamydia trachomatis, C. caviae, C. suis) and recent clinical isolates.
• Completed single cloning cycles within 24 hours post-culture.

Conclusions:

• FACS-based sorting of live Chlamydia-infected cells is a simple, rapid, and effective cloning technique.
• This method facilitates the isolation of clonal populations from diverse Chlamydia strains.
• The technique is anticipated to be a valuable tool for Chlamydia research and diagnostics.