Details:

Alternative Title:
BMC Genomics
Personal Author:
Kimaro Mlacha, Sheila Z. ; Romero-Steiner, Sandra ; Dunning Hotopp, Julie C. ; Kumar, Nikhil ; Ishmael, Nadeeza ; ... More +
Kimaro Mlacha, Sheila Z. ; Romero-Steiner, Sandra ; Dunning Hotopp, Julie C. ; Kumar, Nikhil ; Ishmael, Nadeeza ; Riley, David R. ; Farooq, Umar ; Creasy, Todd H. ; Tallon, Luke J. ; Liu, Xinyue ; Goldsmith, Cynthia S. ; Sampson, Jacquelyn ; Carlone, George M. ; Hollingshead, Susan K. ; Scott, J. Anthony G. ; Tettelin, Hervé Less -
Description:
Background

Streptococcus pneumoniae is a leading cause of childhood morbidity and mortality worldwide, despite the availability of effective pneumococcal vaccines. Understanding the molecular interactions between the bacterium and the host will contribute to the control and prevention of pneumococcal disease.

Results

We used a combination of adherence assays, mutagenesis and functional genomics to identify novel factors involved in adherence. By contrasting these processes in two pneumococcal strains, TIGR4 and G54, we showed that adherence and invasion capacities vary markedly by strain. Electron microscopy showed more adherent bacteria in association with membranous pseudopodia in the TIGR4 strain. Operons for cell wall phosphorylcholine incorporation (lic), manganese transport (psa) and phosphate utilization (phn) were up-regulated in both strains on exposure to epithelial cells. Pneumolysin, pili, stress protection genes (adhC-czcD) and genes of the type II fatty acid synthesis pathway were highly expressed in the naturally more invasive strain, TIGR4. Deletion mutagenesis of five gene regions identified as regulated in this study revealed attenuation in adherence. Most strikingly, ∆SP_1922 which was predicted to contain a B-cell epitope and revealed significant attenuation in adherence, appeared to be expressed as a part of an operon that includes the gene encoding the cytoplasmic pore-forming toxin and vaccine candidate, pneumolysin.

Conclusion

This work identifies a list of novel potential pneumococcal adherence determinants.


Subjects:
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Bacterial Adhesion Cell Line, Tumor Gene Expression Profiling Gene Knockout Techniques Genes, Bacterial Genomics Humans Oligonucleotide Array Sequence Analysis Pharynx Phenotype Sequence Deletion Species Specificity Transcription, Genetic
Source:
BMC Genomics. 2013; 14:383.
Document Type:
Journal Article
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:347470851f779dc6c291174add800c65378ddf3e8e08c8d577fc4549dc809162
Download URL:
https://stacks.cdc.gov/view/cdc/19574/cdc_19574_DS1.pdf
File Type:

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