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 AiM  Vol.8 No.10 , October 2018
Comparative Assessment of Growth and Gene Regulation between 4 Serotypes of Streptococcus pneumoniae in Broth and Cell Culture
Abstract: Streptococcus pneumoniae is a medically important pathogen capable of causing human infections of pneumonia, bacteremia, otitis media, and meningitis. Although there are vaccinations available, infections with S. pneumoniae still remains a global problem. S. pneumoniae is a highly adaptable bacterial species with numerous serotypes based on capsular polysaccharides. The different serotypes vary in their ability to colonize and causing pathology. Here we compared the regulation of five different virulence factors from four common serotypes of S. pneumoniae that vary in their carriage, morbidity, and mortality rates in the human population using two different in vitro methods, broth and cell culture. We determine that there is variation of virulence factor gene regulation within a serotype using two different culture methods, and variation between the serotypes in the same culture condition. The regulation of genes appeared to have a correlation with the ability of the various serotypes to grow in broth culture, adhere to cultured lung cells, and invade the cultured lung cells, as serotypes that shared similar regulation of virulence factors tended to behave similarly in culture. Many studies with S. pneumoniae rely on the use of one selected serotype, but since there is a wide variation in the growth and regulatory mechanisms of these bacteria. As demonstrated here, future studies should utilize more strains in models before concluding mechanisms of pathobiology.
Cite this paper: Seabolt, B. , Brady, J. and Speshock, J. (2018) Comparative Assessment of Growth and Gene Regulation between 4 Serotypes of Streptococcus pneumoniae in Broth and Cell Culture. Advances in Microbiology, 8, 763-777. doi: 10.4236/aim.2018.810050.
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