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fimA and tctC based DNA diagnostics for Salmonella
J L Doran1, S K Collinson, C M Kay
1Department of Microbiology and Biochemistry, University of Victora, British Columbia, Canada.
Molecular and Cellular Probes
|August 1, 1994
Summary
Researchers developed highly reliable DNA probes for Salmonella detection. These probes target fimA and tctC genes, offering accurate identification of Salmonella bacteria across numerous serovars.
Area of Science:
- Microbiology
- Molecular Biology
- Bacteriology
Background:
- Salmonella fimbriae, including SEF21 from Salmonella enteritidis, exhibit antigenic relatedness.
- Immunochemical detection using anti-SEF21 antiserum showed limitations for Salmonella diagnostics due to fimbrial variability or deficiency.
Purpose of the Study:
- To develop highly specific and sensitive DNA-based diagnostic probes for Salmonella detection.
- To overcome limitations of immunochemical methods in identifying diverse Salmonella serovars.
Main Methods:
- Oligonucleotide probes were designed based on fimA gene sequences from Salmonella enteritidis, compared with other bacterial species.
- A Salmonella-specific tctC DNA probe was identified to enhance inclusivity.
- Polymerase Chain Reaction (PCR) assays targeting fimA and tctC were developed.
Main Results:
- One oligonucleotide probe detected all tested Salmonella isolates (612/612) across 89 serovars.
- Two additional probes detected 97.5% and 99.7% of Salmonella isolates.
- The combined fimA and tctC DNA probes demonstrated high specificity, with no cross-hybridization to other Enterobacteriaceae or bacterial species.
Conclusions:
- DNA probes targeting fimA and tctC genes are highly reliable for Salmonella diagnostics.
- The developed probes and PCR assays provide accurate and specific detection of Salmonella bacteria.
- These molecular tools offer an improved method for identifying Salmonella across various serovars.