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[Plasmid composition of Yersinia pestis strains from different natural foci]
Abstract:
The study of the plasmid composition of 246 Y. pestis strains from different natural foci in the USSR and other countries revealed that 173 strains (70%) carried three known plasmids with a molecular weight of about 6, 45-50 and 60 megadaltons (MD) respectively. In 20 strains (8%) obtained from different sources additional cryptic plasmids were detected. In some cases the absence of one or two typical plasmids was observed. Replicon pPst was shown to have quite constant molecular weight (6 MD), whereas plasmids pCad and especially pFra exhibited certain variations of their molecular weight (45-49 MD and 60-149 MD respectively) in strains of different origin.
Insights
Yersinia pestis plasmid composition was studied in 246 strains. Most strains contained three key plasmids, though variations and additional cryptic plasmids were found, impacting Y. pestis research.
Area of Science:
- Microbiology
- Genetics
- Epidemiology
Background:
- Plasmids are crucial for bacterial virulence and adaptation.
- Understanding plasmid diversity in Yersinia pestis is essential for tracking outbreaks and developing control strategies.
Purpose of the Study:
- To characterize the plasmid composition of Yersinia pestis strains from diverse geographical origins.
- To identify variations in plasmid content and molecular weight among different Y. pestis isolates.
Main Methods:
- Plasmid DNA was extracted from 246 Yersinia pestis strains.
- Plasmid profiles were analyzed using gel electrophoresis to determine molecular weights.
- Strains were sourced from various natural foci within the USSR and other countries.
Main Results:
- 173 strains (70%) harbored three common plasmids (6, 45-50, and 60 MD).
- 20 strains (8%) possessed additional cryptic plasmids.
- Plasmid pPst (6 MD) showed stable molecular weight, while pCad (45-49 MD) and pFra (60-149 MD) exhibited significant variations.
Conclusions:
- Plasmid composition in Yersinia pestis is variable, particularly for pCad and pFra plasmids.
- Observed variations in plasmid content and molecular weight may reflect geographical origin and evolutionary adaptation.
- Further investigation into these plasmid variations is warranted for a comprehensive understanding of Y. pestis epidemiology.