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Differentiation of Chlamydia psittaci and C. pecorum strains by species-specific PCR
N Sheehy1, B Markey, M Gleeson
1Department of Veterinary Microbiology and Parasitology, Faculty of Veterinary Medicine, University College Dublin, Ireland.
Abstract:
Sequence analyses 5' ends of the 60-kDa cysteine-rich outer membrane protein genes (Omp2) of Chlamydia psittaci and Chlamydia pecorum strains indicate that these species have approximately 70% nucleotide identity. On the basis of this sequence information, PCR primers were designed to allow the specific amplification of DNA extracted from C. psittaci S26/3 (abortion strain), P94/1 (pigeon strain), and C. pecorum W73 (fecal strain) in one reaction tube. By using nested reactions (with primers PCR-D1 and PCR-D2 followed by the specific primers and PCR-D2), 0.6, 0.2, and 8 inclusion-forming units of S26/3, P94/1 (both diluted in tissue culture-negative placental material), and W73 (diluted in culture-negative fecal material) per ml, respectively, were detected. The differentiation of C. psittaci and C. pecorum strains of ovine and bovine origins was carried out, and the results were in agreement with those obtained from AluI restriction enzyme analysis of DNA amplified from corresponding strains by PCR. This approach allows the simultaneous detection and typing of C. psittaci and C. pecorum strains and the identification of samples containing both species.
Insights
This study developed a PCR method to detect Chlamydia psittaci and Chlamydia pecorum. The new technique allows simultaneous identification and differentiation of these important Chlamydia species.
Area of Science:
- Veterinary Microbiology
- Molecular Diagnostics
Background:
- Chlamydia psittaci and Chlamydia pecorum are significant pathogens in livestock and poultry.
- Accurate and rapid diagnostic methods are crucial for controlling Chlamydia infections.
Purpose of the Study:
- To develop a sensitive and specific PCR assay for the simultaneous detection and differentiation of Chlamydia psittaci and Chlamydia pecorum.
- To enable the identification of mixed infections.
Main Methods:
- Sequence analysis of the omp2 gene from C. psittaci and C. pecorum.
- Design of specific PCR primers based on sequence data.
- Development of a nested PCR protocol for enhanced sensitivity.
- Comparison of PCR results with AluI restriction enzyme analysis.
Main Results:
- High nucleotide identity (~70%) was observed between the omp2 genes of C. psittaci and C. pecorum.
- The developed PCR assay successfully amplified DNA from different strains of both species.
- The nested PCR could detect low levels of infection (0.2-8 IFUs/ml) in various sample types.
- PCR results correlated well with restriction enzyme analysis for strain differentiation.
- Simultaneous detection of both species in a single sample was achieved.
Conclusions:
- The developed PCR method provides a reliable tool for the simultaneous detection and differentiation of Chlamydia psittaci and Chlamydia pecorum.
- This assay facilitates the diagnosis of infections caused by these Chlamydia species in veterinary settings.
- The method aids in understanding the epidemiology and control of Chlamydia-related diseases.