Study of IncA/C Plasmids in E. coli from Animals
Author Information
Author(s): Claudia Fernández-Alarcón, Randall S. Singer, Timothy J. Johnson
Primary Institution: University of Minnesota
Hypothesis
The study aims to analyze genetic differences in several IncA/C plasmids from E. coli recovered from differing production animal sources and geographical locations.
Conclusion
The study found that IncA/C plasmids are widespread among enteric bacteria of production animals and have flexibility in acquiring multidrug resistance-encoding modules.
Supporting Evidence
- IncA/C plasmids have a broad host range and can confer resistance to multiple antimicrobial agents.
- Sequence analysis revealed a stable backbone sequence with differences in accessory regions.
- Evidence suggests that these plasmids have evolved through horizontal gene transfer.
Takeaway
Scientists looked at tiny circles of DNA in bacteria from animals to see how they can make germs resistant to medicine. They found that these circles can change a lot and help germs spread their resistance.
Methodology
Four animal-source IncA/C plasmids were sequenced and analyzed using high-throughput Roche 454 DNA sequencing.
Limitations
The study does not address the long-term persistence of these plasmids in bacterial populations without selective pressure.
Participant Demographics
Plasmids were isolated from E. coli strains from commercial dairy cows, pigs, and turkeys in the U.S. and Chile.
Digital Object Identifier (DOI)
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