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Scientists sequence genome of pathogen responsible for pneumocystis pneumonia
Date:12/25/2012

WASHINGTON, DC December 26, 2012 -- Scientists have sequenced the genome of the fungus Pneumocystis jirovecii, an advancement that could help identify new targets for drugs to treat and prevent Pneumocystis pneumonia, a common and often deadly infection in immunocompromised patients. The study will be published on December 26, 2012 in mBio, the online open-access journal of the American Society for Microbiology. The organism cannot yet be isolated and grown for study in the laboratory, so details about Pneumocystis pneumonia, the biology of P. jirovecii, and its pathogenicity are hard to come by. The genome sequence represents a wealth of new information for doctors and researchers tackling this disease.

Pneumocystis pneumonia is an opportunistic infection that strikes most often in individuals with diminished immune systems. The corresponding author of the study in mBio, Philippe Hauser of the Centre Hospitalier Universitaire Vaudois and University of Lausanne, in Switzerland, says the disease gained importance in the 1980s.

"Recognized first among malnourished infants, P. jirovecii pneumonia became a public issue with the advent of the HIV epidemic," says Hauser. Today, the disease most commonly affects HIV-infected persons who are unaware of their status as well as solid organ transplant recipients and patients with hemato-oncologic or autoimmune diseases. Since the organism cannot be grown in the lab for study, researchers have long made do with studying P. jirovecii's lab-friendly relatives, species that infect animals and plants, in order to explore the secrets of the human disease.

"It is obviously better to study [P. jirovecii's] genes rather that those of Pneumocystis species from animal models. The genome has both medical and evolutionary interests for the scientific community," says Hauser.

Under normal circumstances, scientists sequencing the genome of a microor
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Contact: Garth Hogan
ghogan@asmusa.org
American Society for Microbiology
Source:Eurekalert

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