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Detection of toxigenic M1UK lineage group A Streptococcus clones in Taiwan

ABSTRACT: M1UK in Taiwan

PROVIDER: PRJEB72724 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR12736400_1.fastq.gz	Fastqsanger.gz
	ERR12736400_2.fastq.gz	Fastqsanger.gz
	ERR12736401_1.fastq.gz	Fastqsanger.gz
	ERR12736401_2.fastq.gz	Fastqsanger.gz
	ERR12736402_1.fastq.gz	Fastqsanger.gz

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A Rapid Molecular Detection Tool for Toxigenic M1UK Streptococcus pyogenes.

Project description:BackgroundThe gradual replacement of the Streptococcus pyogenes M1global genotype by a newly emergent M1UK variant is a global public health threat warranting increased surveillance. M1UK differs from progenitor M1global genotype by 27 single-nucleotide polymorphisms and is characterized by increased speA superantigen expression in vitro.MethodsAn allele-specific real-time polymerase chain reaction assay was developed for the rapid detection of M1UK strains. The assay was used in combination with whole genome sequencing to determine emm (sub)type distribution for 51 invasive (n = 9) and noninvasive (n = 42) S pyogenes clinical isolates.ResultsEmm1 was the most prevalent S pyogenes emm serotype (n = 11) in this set of clinical isolates, with M1UK being the dominant emm1 genotype (4/5 invasive, 3/6 noninvasive isolates). The assay accurately detected M1UK strains. Whole genome sequencing revealed continued presence of Australian M1UK sublineages associated with epidemic scarlet fever-causing S pyogenes in Asia.ConclusionsOur study establishes a suitable target for detection of the toxigenic M1UK and confirms the maintenance of M1UK strains in Queensland, Australia. This assay can be deployed in laboratories and provides a valuable, cost-effective tool to enhance surveillance of the expanding M1UK clone.

| S-EPMC11841628 | biostudies-literature

Characterisation of a novel covS SNP identified in Australian Group A Streptococcus isolates derived from the M1UK lineage

Project description:Group A Streptococcus (GAS) is a human-adapted pathogen responsible for a variety of diseases. The GAS M1UK lineage has contributed significantly to the recently reported increases in scarlet fever and invasive infections, however the basis for its evolutionary success is not yet fully understood. During the transition to systemic disease, the M1 serotype is known to give rise to spontaneous mutations in the CovRS two-component transcriptional regulation system that confer a fitness advantage during invasive infections. Mutations that inactivate CovS function result in the de-repression of key GAS virulence factors such as Streptolysin O (SLO), a pore-forming toxin and major trigger of inflammasome/interleukin-1-dependent inflammation. Conversely, expression of the streptococcal cysteine protease SpeB, which is required during initial stages of colonisation and onset of invasive disease, is typically lost in such mutants. In this study, we identified and characterised a novel covS mutation detected in three separate invasive M1UK isolates. The resulting CovSAla318Val mutation caused a significant upregulation of SLO resulting in increased inflammasome activation in human THP-1 macrophages, indicating an enhanced inflammatory potential. Surprisingly, SpeB production was unaffected. Site-directed mutagenesis was performed to assess the impact of this mutation on virulence and global gene expression. We found that the CovSAla318Val mutation led to subtle, virulence-specific changes of the CovRS regulon compared to previously characterised covS mutations, highlighting an unappreciated level of complexity in CovRS-dependent gene regulation. Continued longitudinal surveillance is warranted to determine whether this novel covS mutation will expand in the M1UK lineage.

2024-10-28 | GSE280498 | GEO

Characterisation of the genetic mutation driving enhanced superantigen SpeA expression in Streptococcus pyogenes M1UK (initial)

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.

2023-01-30 | GSE212238 | GEO

Characterisation of the genetic mutation driving enhanced superantigen SpeA expression in Streptococcus pyogenes M1UK (second SP1448)

2023-01-30 | GSE212242 | GEO

Characterisation of the genetic mutation driving enhanced superantigen SpeA expression in Streptococcus pyogenes M1UK (second SP1380)

2023-01-30 | GSE212241 | GEO

Characterisation of the genetic mutation driving enhanced superantigen SpeA expression in Streptococcus pyogenes M1UK (second 5448)

2023-01-30 | GSE212239 | GEO

M1UK reference genome

Project description:M1global and M1UK reference genomes sequenced with pacbio

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Project description:In this study, we used RNA-seqeuncing to develop gene expression profile of HCC patients in Taiwan.

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