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Streptococcus pneumoniae

ABSTRACT: Whole genome sequencing of Streptococcus pneumoniae

PROVIDER: PRJNA779043 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16893657.fastq.gz	Fastqsanger.gz
	SRR16893658.fastq.gz	Fastqsanger.gz
	SRR16893659.fastq.gz	Fastqsanger.gz
	SRR16893660.fastq.gz	Fastqsanger.gz
	SRR16893661.fastq.gz	Fastqsanger.gz

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Methionine starvation caused reprogrammed metabolism in Streptococcus pneumoniae

Project description:In our study, deletion of methionine synthesis gene metE (SPD_0510) impaired the growth of Streptococcus pneumoniae strain D39 significantly when bacteria were cultured in chemically defined medium with a low concentration of methionine. Bacteria undergo methionine starvation in this condition. We aimed to know how S. pneumoniae responses to methionine starvation, particularly at the transcriptional level. RNA-seq results show that 804 genes (41.2 % of whole genome) were differentially expressed under methionine starvation. Among them, 258 genes (32.1 %) are related to cell metabolism, with 75 genes involved in sugar and carbon metabolism, 88 genes for synthesis of metabolic products and 95 genes for uptake of amino acids and sugars. Combined with other experiments data, this showed the reprogrammed metabolism in S. pneumoniae under methionine starvation.

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Project description:This SuperSeries is composed of the following subset Series: GSE31815: ccpA mutant compared to D39 wild-type in Streptococcus pneumoniae in CDM + Glucose at MID-log growth phase GSE31816: ccpA mutant compared to D39 wild-type in Streptococcus pneumoniae in CDM + GLucose at transition-phase of growth (TS) GSE31817: ccpA mutant compared to D39 wild-type in Streptococcus pneumoniae in CDM + Galactose at MID-log growth phase GSE31818: ccpA mutant compared to D39 wild-type in Streptococcus pneumoniae in CDM + galactose at transition-phase of growth (TS) Refer to individual Series

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Project description:Diagnostic primer extension assay to serotype Streptococcus pneumoniae. Assay validation. Background: Monitoring of Streptococcus pneumoniae serotype epidemiology is essential since serotype replacement is a concern when introducing new polysaccharide-conjugate vaccines. To simplify S. pneumoniae serotyping, a novel PCR-based automated microarray assay was developed to assist in the tracking of the serotypes. Results: Autolysin (lytA), pneumolysin (ply) and eight genes located in the capsular operon (cps) were amplified using multiplex PCR. This step was followed by a tagged fluorescent primer extension step targeting serotype-specific polymorphisms. The tagged primers were then hybridized to a microarray. Results were exported to an expert system that transforms genetic typing data into capsular serotype identification. The assay was validated on 166 cultured S. pneumoniae samples from 63 different serotypes as determined by the Quellung method. In addition, the assay was tested on clinical specimens including 43 cerebrospinal fluid samples from patients with meningitidis and 59 nasopharyngeal aspirates from bacterial pneumonia patients. The assay presented with no cross-reactivity for 24 relevant bacterial species found in these types of samples. The limit of detection for serotyping and S. pneumoniae detection was 100 genome equivalent per reaction. Conclusion: This automated assay is amenable to clinical testing and does not require any culturing of the samples. The assay will be useful for the evaluation of serotype prevalence changes after new conjugate vaccines introduction.

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