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Date:11/2/2011

the first bacterial strain to carry three closely related but independently conjugative plasmids.

The authors were researching the pathogensis of avian necrotic enteritis, a disease caused by the bacterium Clostridium perfringens which causes necrotic lesions in the small intestines of infected birds. This disease is economically important to the poultry industry as acute clinical disease leads to increased mortality of birds and subclinical disease leads to decreased weight and loss of productivity.

In order to cause disease, the bacterium must be capable of producing the toxin netB. In this study the researchers examined the location of netB gene within the Australian necrotic enteritis isolate EHE-NE18, a strain that was also resistant to tetracycline. They found the gene was encoded on a plasmid, a piece of DNA which exists inside the bacterium but is separate from the chromosomal DNA. Plasmids can also replicate independently and can be transferred to other bacteria.

Additional research identified two other plasmids that shared a similar DNA sequence but coded for different processes. One encoded a different toxin, called beta2, and the other coded for the tetracycline resistance.

"To our knowledge, this is the first report of a bacterial strain that carries three closely related by different independently conjugative plasmids. These results have significant implications for our understanding of the transmission of virulence and antibiotic resistance genes in pathogenic bacteria," write the authors.

http://mbio.asm.org/content/2/5/e00190-11


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Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert

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