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Updated: Sep 28, 2026
Live-Cell Forward Genetic Approach to Identify and Isolate Developmental Mutants in Chlamydia trachomatis
Published on: June 10, 2020
Selection of mutant cell lines resistant to infection by Chlamydia spp [corrected]
Trevor Fudyk1, Lynn Olinger, Richard S Stephens
1Division of Infectious Diseases, School of Public Health, University of California, Berkeley, California 94720, USA.
Abstract:
The lytic outcome of natural infection by Chlamydia trachomatis was exploited to select CHO (Chinese hamster ovary) cells, following chemical mutagenesis, that were deficient in their ability to sustain productive chlamydial infection. Four distinct mutant cell phenotypes with defects in either attachment or postattachment mechanisms that are required for infection by C. trachomatis and Chlamydia pneumoniae were characterized.
Insights
Researchers identified Chinese hamster ovary (CHO) cells unable to support Chlamydia trachomatis infection after mutagenesis. These CHO cell mutants reveal crucial attachment and postattachment steps vital for Chlamydia pneumoniae and C. trachomatis infection.
Area of Science:
- Microbiology
- Cell Biology
- Genetics
Background:
- Chlamydia trachomatis is an obligate intracellular bacterium causing significant human diseases.
- Understanding host cell factors essential for Chlamydia infection is crucial for developing therapeutic strategies.
- Chinese hamster ovary (CHO) cells are a widely used model system in biological research.
Purpose of the Study:
- To identify host cell genes and pathways involved in Chlamydia trachomatis infection.
- To generate and characterize cell mutants with defects in Chlamydia infection.
- To elucidate the mechanisms of Chlamydia attachment and intracellular invasion.
Main Methods:
- Chemical mutagenesis of CHO cells was performed.
- Selection of mutant cells resistant to Chlamydia trachomatis infection.
- Phenotypic characterization of selected mutants, including assessment of attachment and postattachment steps.
- Analysis of infection by both Chlamydia trachomatis and Chlamydia pneumoniae.
Main Results:
- Four distinct mutant CHO cell phenotypes were identified.
- Mutants exhibited defects in either the attachment or postattachment stages of infection.
- These defects impacted infection by both Chlamydia trachomatis and Chlamydia pneumoniae.
- The study successfully isolated cell lines with impaired Chlamydia susceptibility.
Conclusions:
- Host cell factors regulating attachment and postattachment processes are critical for productive Chlamydia infection.
- The identified CHO cell mutants provide valuable tools for dissecting Chlamydia-host cell interactions.
- This research contributes to understanding the cellular basis of Chlamydia pathogenesis and potential therapeutic targets.
