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Plant microbe shares features with drug-resistant pathogen
Date:6/16/2009

UPTON, NY -- An international team of scientists has discovered extensive similarities between a strain of bacteria commonly associated with plants and one increasingly linked to opportunistic infections in hospital patients. The findings suggest caution in the use of the plant-associated strain for a range of biotech applications. The genetic analysis was conducted in part at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory, and will be published in the July 2009 issue of Nature Reviews Microbiology, now available online.

The research team - which included scientists from Ireland, Austria, and the United Kingdom as well as the U.S. - was investigating the versatility and adaptability of a group of bacteria known as Stenotrophomonas. These bacteria have great metabolic versatility, allowing them to thrive in very diverse environments.

The scientists were particularly interested in comparing two strains of S. maltophilia whose genomes were recently decoded to see why these strains - one isolated as an opportunistic pathogen from a clinical setting (strain K279a), and the other from the roots of poplar trees (strain R551-3) - were so well-suited to their very different environments. Such comparisons are made possible by the high throughput and cost-effective DNA sequencing capacity developed by DOE's Joint Genome Institute, as well as the Sanger Institute, to help elucidate the role of microorganisms in health, energy, and environmental processes.

"Surprisingly, we observed very few differences between the opportunistic pathogen and the common plant bacterium," said Brookhaven Lab microbiologist Daniel (Niels) van der Lelie, an expert on soil- and plant-associated microbes, whose team provided the data on the plant-dwelling strain.

For one thing, the scientists found genes that make the bacteria resistant to a wide range of antibiotics in both strains. "This suggests that antibiotic resistance is pa
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Contact: Karen McNulty Walsh
kmcnulty@bnl.gov
631-344-8350
DOE/Brookhaven National Laboratory
Source:Eurekalert

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