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Deciphering the genetic basis of Moraxella catarrhalis complement resistance: Gene expression analysis of Moraxella catarrhalis BBH18 upon exposure to normal human serum.

ABSTRACT: The complement system is an important part of the innate defense against invading pathogens. The ability to resist complement-mediated killing is considered to be an important virulence trait for the human-restricted respiratory tract pathogen M. catarrhalis, as most disease-associated M. catarrhalis isolates are complement-resistant. Here we studied the molecular basis of M. catarrhalis complement-resistance by transcriptome profiling upon exposure to 10% normal human serum (NHS).

ORGANISM(S): Moraxella catarrhalis BBH18

PROVIDER: GSE52552 | GEO | 2014/06/23

SECONDARY ACCESSION(S): PRJNA229370

REPOSITORIES: GEO

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Deciphering the genetic basis of Moraxella catarrhalis complement resistance: Gene expression analysis of Moraxella catarrhalis BBH18 upon exposure to normal human serum.

Project description:The complement system is an important part of the innate defense against invading pathogens. The ability to resist complement-mediated killing is considered to be an important virulence trait for the human-restricted respiratory tract pathogen M. catarrhalis, as most disease-associated M. catarrhalis isolates are complement-resistant. Here we studied the molecular basis of M. catarrhalis complement-resistance by transcriptome profiling upon exposure to 10% normal human serum (NHS). After 1h exposure of M. catarrhalis BBH18 to 10% NHS (n = 5) or the NHS dilution buffer alone (control, n = 5), total RNA was isolated and labeled cDNA was generated according to standard Nimblegen gene expression array protocols and hybridized to 4x72K Nimblegen M. catarrhalis expression arrays for read-out.

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Project description:Moraxella catarrhalis is a human-restricted bacterial pathogen that causes otitis media in children and exacerbations of chronic obstructive pulmonary disease in adults. Iron is a co-factor required for the function of proteins involved in respiration and DNA replication, and thus is essential to life for most bacterial species. As iron is sequestered by host tissues, all host-adapted pathogens encounter periods of iron starvation. Previous studies have defined the repertoire of genes required for growth of M. catarrhalis under iron restricted conditions, and described differential expression at the transcriptional level. However, global changes in protein expression in response to iron starvation have not been investigated. Here we provide a SWATH-MS dataset describing differential expression of the M. catarrhalis CCRI-195ME proteome under iron restricted versus iron replete conditions.

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