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Mycoplasma gallisepticum F-vaccine strain-specific polymerase chain reaction
E R Nascimento1, R Yamamoto, M I Khan
1Department of Epidemiology and Preventive Medicine, School of Veterinary Medicine, University of California, Davis 95616.
Abstract:
A Mycoplasma gallisepticum (MG) F-vaccine strain polymerase chain reaction (PCR) (MGF-PCR) was developed and standardized. The origin of the primers was a clone (p08-M6#17) that contained an MG F-strain-specific DNA fragment of 6.0 kilobase pairs designated fMGF-1. Both ends of fMGF-1 (BamHI and EcoRI) were sequenced, and regions adequate for the primers were chosen. Seven 25-base primers were synthesized, and two near the EcoRI end (MGF-P1 left [L] and right [R]) were selected for MGF-PCR, MGF-P1 L and R amplified a DNA product of 524 base pairs (bp) that was directed at F-strain-related MG only. None of 16 other species of avian mycoplasmas that were tested yielded MGF-PCR product. MGF-PCR was able to consistently detect F-strain samples containing 54 cells or more and inconsistently (at least one positive out of five replicates) in samples with fewer organisms. The MGF-PCR products were visualized either by gel electrophoresis or Southern blot hybridization with a probe containing an identical base sequence as the 524-bp product amplified by MGF-PCR. The MGF-PCR was 1000 to 10,000 times more sensitive than dot-blot assays using two MG F-strain-specific probes.
Insights
A novel Mycoplasma gallisepticum (MG) F-vaccine strain polymerase chain reaction (MGF-PCR) assay was developed. This highly sensitive MGF-PCR method accurately detects F-strain MG, distinguishing it from other avian mycoplasmas.
Area of Science:
- Veterinary Microbiology
- Molecular Diagnostics
- Avian Pathology
Background:
- Mycoplasma gallisepticum (MG) is a significant avian pathogen.
- Accurate detection of specific MG strains, particularly vaccine strains, is crucial for disease control.
- Existing diagnostic methods may lack the specificity or sensitivity required for certain applications.
Purpose of the Study:
- To develop and standardize a specific polymerase chain reaction (PCR) assay for the Mycoplasma gallisepticum (MG) F-vaccine strain.
- To establish a highly sensitive and specific molecular diagnostic tool for identifying F-strain MG.
Main Methods:
- Development of a Mycoplasma gallisepticum (MG) F-vaccine strain polymerase chain reaction (MGF-PCR) assay.
- Primer design based on sequencing of an MG F-strain-specific DNA fragment (fMGF-1).
- Validation of MGF-PCR specificity against 16 other avian mycoplasma species and sensitivity testing with varying cell concentrations.
Main Results:
- The MGF-PCR assay successfully amplified a 524 bp DNA product specific to F-strain MG.
- No cross-reactivity was observed with 16 other avian mycoplasma species tested.
- MGF-PCR consistently detected F-strain MG with 54 cells or more and showed inconsistent detection with fewer organisms.
- The assay demonstrated 1000 to 10,000 times greater sensitivity than dot-blot assays.
Conclusions:
- The developed MGF-PCR assay is a specific and highly sensitive tool for detecting Mycoplasma gallisepticum F-vaccine strain.
- This molecular method offers significant advantages in sensitivity over traditional dot-blot assays.
- MGF-PCR provides a valuable diagnostic option for identifying F-strain MG in avian samples.