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Phylogenetics of Salmonella enteritidis
1NCTC Molecular Genetics Unit, Central Public Health Laboratory, London, England, UK.
International Journal of Food Microbiology
|January 1, 1994
Summary
Salmonella enteritidis exhibits significant genetic uniformity in human isolates. This serovar is polyphyletic, closely related to other Salmonellae, and may hold an ancestral position in their evolution.
Area of Science:
- Microbiology
- Genetics
- Evolutionary Biology
Background:
- Salmonella enteritidis is a significant human pathogen.
- Understanding its genetic diversity is crucial for public health and evolutionary studies.
Purpose of the Study:
- To review the phylogenetics of Salmonella enteritidis.
- To compare the genotypes of S. enteritidis with related Salmonella serovars.
Main Methods:
- Restriction Fragment Length Polymorphism (RFLP) typing using chromosomal DNA, rRNA genes, and insertion sequence probes.
- Multilocus Enzyme Electrophoresis (MEE).
Main Results:
- Human isolates of Salmonella enteritidis show high genotypic homogeneity.
- MEE reveals S. enteritidis is polyphyletic, closely related to S. dublin, S. gallinarum, and S. pullorum.
- Two classes of virulence plasmids are identified in S. enteritidis.
Conclusions:
- Salmonella enteritidis is suggested to occupy an ancestral and pivotal position among the studied Salmonellae.
- The findings contribute to understanding the evolutionary relationships within the Salmonella genus.