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[Genetic study of plasmid pVM82 which contributes to the pathogenicity of the pseudotuberculosis pathogen]
Abstract:
The large pVM82 plasmid isolated from epidemic strains of Yersinia pseudotuberculosis includes the 25MD segment, which encodes a series of properties affecting the virulence of the bacterium. Insertion mutants of pVM82 containing transposition-defective Tn2507 with a kanamycin-resistance marker in different Hind III fragments of the 25MD segment were obtained. By recombination between two homologous pVM82 containing genetic markers in different parts, deletion derivatives of pVM82 plasmid and insertions of the plasmid segment, carrying kanamycin-resistance marker, into a chromosome were obtained. Results were obtained suggesting the presence in the plasmid 25MD segment of a transposon-like structure capable of migrating from pVM82 plasmid onto a chromosome and from a chromosome and pVM82 onto pRP1.2 plasmid of a broad host range.
Insights
The pVM82 plasmid
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Context:
- Epidemic strains of Yersinia pseudotuberculosis harbor the pVM82 plasmid.
- The pVM82 plasmid contains a 25MD segment crucial for bacterial virulence.
- Understanding plasmid-mediated virulence factors is essential in combating bacterial infections.
Purpose:
- To investigate the genetic elements within the 25MD segment of the pVM82 plasmid.
- To characterize the mobility and integration capabilities of the 25MD segment.
- To explore potential horizontal gene transfer mechanisms involving the pVM82 plasmid.
Summary:
- Insertion mutants and deletion derivatives of the pVM82 plasmid were generated using Tn2507.
- Evidence suggests a transposon-like structure within the 25MD segment.
- This structure can migrate from the pVM82 plasmid to the chromosome and other plasmids.
Impact:
- Identifies a mobile genetic element within a virulence plasmid.
- Provides insights into the genetic plasticity of Yersinia pseudotuberculosis.
- Suggests potential mechanisms for the spread of virulence genes in bacteria.