Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/96607
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Type: Journal article
Title: Characterization of pneumococcal genes involved in bloodstream invasion in a mouse model
Author: Mahdi, L.
Van der Hoek, M.
Ebrahimie, E.
Paton, J.
Ogunniyi, A.
Citation: PLoS One, 2015; 10(11):e0141816-1-e0141816-15
Publisher: Public Library of Science
Issue Date: 2015
ISSN: 1932-6203
1932-6203
Statement of
Responsibility: 
Layla K. Mahdi, Mark B. Van der Hoek, Esmaeil Ebrahimie, James C. Paton, Abiodun D. Ogunniyi
Abstract: Streptococcus pneumoniae (the pneumococcus) continues to account for significant morbidity and mortality worldwide, causing life-threatening diseases such as pneumonia, bacteremia and meningitis, as well as less serious infections such as sinusitis, conjunctivitis and otitis media. Current polysaccharide vaccines are strictly serotype-specific and also drive the emergence of non-vaccine serotype strains. In this study, we used microarray analysis to compare gene expression patterns of either serotype 4 or serotype 6A pneumococci in the nasopharynx and blood of mice, as a model to identify genes involved in invasion of blood in the context of occult bacteremia in humans. In this manner, we identified 26 genes that were significantly up-regulated in the nasopharynx and 36 genes that were significantly up-regulated in the blood that were common to both strains. Gene Ontology classification revealed that transporter and DNA binding (transcription factor) activities constitute the significantly different molecular functional categories for genes up-regulated in the nasopharynx and blood. Targeted mutagenesis of selected genes from both niches and subsequent virulence and pathogenesis studies identified the manganese-dependent superoxide dismutase (SodA) as most likely to be essential for colonization, and the cell wall-associated serine protease (PrtA) as important for invasion of blood. This work extends our previous analyses and suggests that both PrtA and SodA warrant examination in future studies aimed at prevention and/or control of pneumococcal disease.
Keywords: Nasopharynx; Animals; Mice; Streptococcus pneumoniae; Bacteremia; Pneumococcal Infections; Otitis Media; Disease Models, Animal; Superoxide Dismutase; Virulence Factors; Virulence; Up-Regulation; Genes, Bacterial; Female; Male; Serogroup
Rights: © 2015 Mahdi et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
RMID: 0030038643
DOI: 10.1371/journal.pone.0141816
Grant ID: http://purl.org/au-research/grants/nhmrc/565526
http://purl.org/au-research/grants/nhmrc/627142
Appears in Collections:Molecular and Biomedical Science publications

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