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Gene Expression Profile of Moraxella catarrhalis Grown in Pooled Human Sputum

ABSTRACT: Comparison of the gene expression profile of Moraxella catarrhalis grown in the presence of 20% pooled human sputum in chemically-defined medium relative to Moraxella catarrhalis grown in chemically-defined medium alone.

ORGANISM(S): Moraxella catarrhalis Moraxella catarrhalis ATCC 43617

PROVIDER: GSE27059 | GEO | 2014/02/02

SECONDARY ACCESSION(S): PRJNA137619

REPOSITORIES: GEO

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Gene Expression Profile of Moraxella catarrhalis Grown in Pooled Human Sputum

Project description:Comparison of the gene expression profile of Moraxella catarrhalis grown in the presence of 20% pooled human sputum in chemically-defined medium relative to Moraxella catarrhalis grown in chemically-defined medium alone. Moraxella catarrhalis ATCC43617 was grown to mid-logarithmic phase either in the presence of 20% pooled human sputum in chemically-defined medium or in chemically-defined medium alone. Total RNA was extracted from bacterial cells exposed to each of these conditions and cDNA was generated for CyDye labelling. 3 biologic replicates were generated and each replicate underwent a dye swap (total of 6 experimental data collections). The gene expression profile reported is that of Moraxella catarrhalis grown in the presence of pooled human sputum in a chemically-defined medium relative to Moraxella catarrhalis grown only in the presence of the chemically-defined medium.

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Project description:Total RNA samples were isolated from M. catarrhalis grown in BHI (iron-replete condition, designated DF0) and in BHI containing 30 mM Desferal (iron-limiting condition, designated DF30). Total RNA and M. catarrhalis genome-directed primers (GDPs) were used for synthesis of Cy3- or Cy5-labeled cDNA samples. Three independent M. catarrhalis growth experiments and total RNA isolations were used for synthesis of cDNA samples, and a total of six DNA microarray hybridizations were performed in this study. Keywords: Effect of Growth Environment on Global Gene Expression by Moraxella catarrhalis

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Project description:During the course of infection, respiratory pathogens like Moraxella catarrhalis needs to adhere to epithelial cells of different host niches such as the nasopharynx and lungs. Consequently, efficient adhesion to epithelial cells is considered an important virulence trait of M. catarrhalis. We examined the interaction between human pharyngeal epithelial Detroit 562 cells and M. catarrhalis BBH18 during adherence using a combination of Tn-seq, a genome-wide negative selection screenings technology, and expression profiling of both host and pathogen. The results described in this study are further discussed in Stefan P.W. de Vries, Marc J. Eleveld, Peter W.M. Hermans, Hester J. Bootsma: Characterization of the molecular interplay between Moraxella catarrhalis and human respiratory tract epithelial cells, submitted.

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