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Scientists decode genome of oral pathogen

RICHMOND, Va. (April 5, 2007) -- Virginia Commonwealth University researchers have decoded the genome of a bacteria normally present in the healthy human mouth that can cause a deadly heart infection if it enters the bloodstream.

The finding enables scientists to better understand the organism, Streptococcus sanguinis, and develop new strategies for treatment and infection prevention.

S. sanguinis, a type of bacteria that is naturally present in the mouth, is among a variety of microorganisms responsible for the formation of dental plaque. In general, S. sanguinis is harmless. However, if it enters the bloodstream, possibly through a minor cut or wound in the mouth, it can cause bacterial endocarditis, a serious and often lethal infection of the heart.

Individuals with preexisting heart problems are at an increased risk of developing bacterial endocarditis. The infection may result in impaired heart function and complications such as heart attack and stroke. Typically, before dental surgery, such patients are given high dose antibiotics to prevent infection.

Decoding S. sanguinis, a streptococcal bacteria, will provide researchers with unique insight into its complex life cycle, metabolism and its ability to invade the host and cause bacterial endocarditis.

"We can apply this information toward the design of new treatments and preventative strategies to protect against this disease," said lead investigator, Francis Macrina, Ph.D., VCUs vice president for research. "Analysis of the genome revealed a surprising number of proteins on the S. sanguinis cell surface that may be new targets for drugs or vaccines. We are already at work pursuing some of these leads."

Although it is not directly associated with tooth decay or gum disease, S. sanguinis is a prominent member of dental plaque. "Genomic studies of this organism will also help us better understand the formation of dental plaque and the initi
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Contact: Sathya Achia-Abraham
sbachia@vcu.edu
804-827-0890
Virginia Commonwealth University
5-Apr-2007


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