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Differential expression of three Chlamydia trachomatis hsp60-encoding genes in active vs. persistent infections
Hervé C Gérard1, Judith A Whittum-Hudson, H Ralph Schumacher
1Department of Immunology and Microbiology, School of Medicine, Wayne State University, Gordon H. Scott Hall, 540 East Canfield Avenue, Detroit, MI 48201, USA.
Microbial Pathogenesis
|December 4, 2003
Summary
Chlamydia trachomatis heat shock protein 60 (hsp60) genes are expressed differently during active versus persistent infections. The Ct604 gene shows significant expression during persistence, suggesting a key role in this state.
Area of Science:
- Microbiology
- Molecular Biology
- Immunology
Background:
- Chlamydia trachomatis is an obligate intracellular bacterium causing various infections.
- Heat shock proteins (hsp60) are crucial for bacterial survival and pathogenesis.
- Differential gene expression of hsp60 genes may play a role in chlamydial infection states.
Purpose of the Study:
- To investigate the expression patterns of three Chlamydia trachomatis hsp60-encoding genes (Ct110, Ct604, Ct755).
- To compare gene expression during active and persistent C. trachomatis infections in vitro.
- To analyze gene expression in synovial samples from patients with Chlamydia-induced arthritis.
Main Methods:
- Real-time reverse transcription polymerase chain reaction (RT-PCR) was employed.
- Gene expression was assessed in HEp-2 cells during active infection.
- Gene expression was analyzed in persistently infected human monocytes and synovial tissue samples.
Main Results:
- During active infection, Ct110 and Ct604 mRNA levels increased significantly post-infection, while Ct755 transcripts were consistently higher.
- In persistent infection, Ct110 and Ct755 expression was low, but Ct604 mRNA levels were high and increased over time.
- Synovial samples from arthritis patients showed high Ct604 mRNA levels, mirroring in vitro persistence findings.
Conclusions:
- Each chlamydial hsp60-encoding gene exhibits independent expression.
- Differential expression of these genes occurs between active and persistent C. trachomatis infections.
- The Ct604 gene product is suggested to be important for chlamydial persistence.