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[Isolation and characteristics of plasmids from Aeromonas]
Abstract:
Fourteen out of fifty-two examined strains of Aeromonas contain plasmids. One of them determines the resistance to tetracycline, streptomycin, and chloramphenicol. The pAs30 plasmid, 53 t. n. p. in size, is capable of conjugative transfer to bacteria of different genera, which permits us to consider it a broad host range plasmid. Using 12 restriction endonucleases, the physical map of the plasmid was plotted, on which the genes responsible for transporting functions and streptomycin resistance were tentatively located.
Insights
A novel plasmid, pAs30, was identified in Aeromonas strains, conferring resistance to multiple antibiotics. This broad host range plasmid can transfer between bacterial genera, aiding in the spread of antibiotic resistance.
Area of Science:
- Microbiology
- Genetics
- Molecular Biology
Context:
- Antibiotic resistance is a growing global health concern.
- Plasmids are key vectors for the dissemination of antibiotic resistance genes among bacteria.
- Aeromonas species are opportunistic pathogens found in various environments.
Purpose:
- To identify and characterize plasmids in Aeromonas strains.
- To investigate the genetic basis of antibiotic resistance in Aeromonas.
- To determine the transferability and host range of identified plasmids.
Summary:
- Fourteen of 52 Aeromonas strains harbored plasmids, with one conferring resistance to tetracycline, streptomycin, and chloramphenicol.
- The pAs30 plasmid (53 kb) exhibits broad host range, capable of conjugative transfer across different bacterial genera.
- A physical map of pAs30 was constructed using 12 restriction endonucleases, tentatively locating genes for transport functions and streptomycin resistance.
Impact:
- Characterization of pAs30 provides insights into the mechanisms of antibiotic resistance spread in Aeromonas.
- Understanding broad host range plasmids like pAs30 is crucial for developing strategies to combat antimicrobial resistance.
- This study contributes to the knowledge of plasmid biology and its role in bacterial adaptation and pathogenicity.