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SRX17302345: GSM6514639: bulk RNA SP1380 wild-type replicate 2; Streptococcus pyogenes; RNA-Seq
1 ILLUMINA (Illumina NovaSeq 6000) run: 33.4M spots, 8G bases, 2.6Gb downloads

External Id: GSM6514639_r1
Submitted by: The University of Melbiurne
Study: Characterisation of the genetic mutation driving enhanced superantigen SpeA expression in Streptococcus pyogenes M1UK (second SP1380)
show Abstracthide Abstract
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. Overall design: RNA-seq
Sample: bulk RNA SP1380 wild-type replicate 2
SAMN30559720 • SRS14864031 • All experiments • All runs
Library:
Name: GSM6514639
Instrument: Illumina NovaSeq 6000
Strategy: RNA-Seq
Source: TRANSCRIPTOMIC
Selection: cDNA
Layout: PAIRED
Construction protocol: RNA was isolated using the RNeasy Plus Kit (Qiagen). Briefly, bacteria were grown to late-logarithmic growth phase in THY. Two volumes of RNAprotect (Qiagen) were added to the cultures and the samples were then centrifuged at 5,000 x g for 25 min at 4°C to pellet cells. RNA was isolated from the dry pellet as per the manufacturer's instructions with an additional mechanical lysis step using Lysing Matrix B tubes (MP Biomedicals) on the FastPrep-2 5G bead beating grinder and lysis system (MP Biomedicals). To ensure complete removal of DNA, the RNA was then further purified using the TURBO DNA-free kit (Thermo Fisher Scientific) according to the manufacturer's instructions. RNAseq analysis was performed at the Australian Centre for Ecogenomics (University of Queensland, Brisbane, Australia). cDNA libraries were prepared from total RNA using TruSeq Stranded Total RNA Library Prep with Ribo-Zero Plus rRNA Depletion kit (Illumina). Sequencing of the cDNA libraries was performed on the NovaSeq 6000 System (Illumina) on a 2x150 bp SP flowcell run generating an average of 20 million reads per sample.
Runs: 1 run, 33.4M spots, 8G bases, 2.6Gb
Run# of Spots# of BasesSizePublished
SRR2129316033,437,3988G2.6Gb2023-01-31

ID:
24123104

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