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Streptococcus pyogenes

ABSTRACT: Whole genome transcritptional comparison of Group A Streptococcus (Streptococcus pyogenes) serotype M1 pre-epidemic and epidemic isolates

PROVIDER: PRJNA288970 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR2087660.fastq.gz	Fastqsanger.gz
	SRR2087670.fastq.gz	Fastqsanger.gz
	SRR2087680.fastq.gz	Fastqsanger.gz
	SRR2087690.fastq.gz	Fastqsanger.gz
	SRR2087661.fastq.gz	Fastqsanger.gz

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Whole genome transcritptional comparison of Group A Streptococcus (Streptococcus pyogenes) serotype M1 pre-epidemic and epidemic isolates

Project description:This transcriptional analysis is a follow up to a population genomic investigation of 3615 Streptococcus pyogenes serotype M1 strains whch are responsible for an epidemic of human invasive infections (www.pnas.org/cgi/doi/10.1073/pnas.1403138111), The goal was to assess gene expression differences between predecessor pre-epidemic M1 strains and their descendent epidemic M1 strains to gain insights into the underlying genetic basis for the shift in the frequency and severity of human infections caused by these pathogenic bacteria The transcriptomes of 7 GAS M1 strains, 4 pre-epidemic and 3 epidemic, were compared at two phases of growth, mid-exponential and early-stationary, using 3 biologial replicates, to identify genes differentially expressed between the pre-epidemic and epidemic isolates with the goal of to gaining insight into the underlying genetic basis for the evolutionary emergence, increased frequency and severity of the epidemic strains relative to the pre-epidemic strains

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Project description:A new variant of group A Streptococcus (GAS) serotype M1 (designated ‘M1UK’) has been reported in the United Kingdom, linked with seasonal scarlet fever surges, marked increase in invasive infections, and exhibiting enhanced expression of the superantigen SpeA. The progenitor GAS ‘M1global’ and M1UK clones can be differentiated by 27 SNPs and 4 indels, yet the mechanism for speA upregulation is unknown. Here we investigate the previously unappreciated expansion of M1UK in Australia, now isolated from the majority of serious infections caused by serotype M1 GAS. M1UK sub-lineages circulating in Australia also contain a novel toxin repertoire associated with epidemic scarlet fever causing GAS in Asia. A single SNP in the M1UK tmRNA gene ssrA drives enhanced SpeA superantigen expression as a result of ssrA terminator readthrough in the M1UK lineage. This represents a new paradigm of toxin expression and urges enhanced international surveillance.

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non-M1 covRS-intact and -mutant GAS vs M1 controls

Project description:Microarray was performed on RNA extracted from mid-logarithmic phase in vitro grown non-M1 Streptococcus pyogenes isolates, with either intact or mutant covRS operons. These isolates were compared with corresponding M1 covRS intact and mutant forms to link the expression prolfiles of these non-M1 isolates with invasive pathogenesis.

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