Dr Claire Turner
Tel: 0114 222 2819
My research focus is on trying to understand the mechanisms behind upsurges in disease caused by the human pathogen Streptococcus pyogenes (also known as group A Streptococcus). Upsurges occur frequently and can be associated with specific genotypes. I use a combination of whole genome sequencing, epidemiology, clinical analysis and phenotypic work to try and identify what makes strains successful at causing disease and become suddenly more abundant.
Figure 1. Whole genome sequencing of 131 isolates of emm89 S. pyogenes from the UK identified an emergent clade variant that differed from the rest of the population of emm89 S. pyogenes by a high number of SNPs. This high level of variation is unexpected within a genotype but, importantly, the majority of the SNPs actually clustered in to six regions within the genome, which is indicative of recombination.
Figure 2. (A) The largest region of recombination with emm89 encompassed the toxin genes nga and slo, which encode for NADase and Streptolysin O, and when combined can be lethal to host cells. These toxins are also thought to promote survival of S. pyogenes inside host cells. Compared to the previous variant, this region in the emergent variant contained a high number of SNPs (indicated by vertical lines; black = synonymous, red = non-synonymous) indicating that this region had been obtained from an external donor. (B) The expression of nga was high in the emergent variant (red) compared to nearly undetectable levels in the previous emm89 variant (blue).
Microbiology, Streptococcus pyogenes, Group A streptococcus, bacterial evolution, scarlet fever, necrotising fasciitis, tonsilitis, whole genome sequencing, recombination.
- The emergence of successful streptococcus pyogenes lineages through convergent pathways of capsule loss and recombination directing high toxin expression. mBio, 10(6). View this article in WRRO
- High burden and seasonal variation of paediatric scabies and pyoderma prevalence in the Gambia : a cross-sectional study. PLOS Neglected Tropical Diseases, 13(10). View this article in WRRO
- Toxic shock syndrome toxin 1 evaluation and antibiotic impact in a transgenic model of staphylococcal soft tissue infection. mSphere, 4(5). View this article in WRRO
- Emergence of dominant toxigenic M1T1 Streptococcus pyogenes clone during increased scarlet fever activity in England : a population-based molecular epidemiological study. The Lancet Infectious Diseases. View this article in WRRO
- Pathogenicity factors in group C and G streptococci. Microbiology Spectrum, 7(3). View this article in WRRO
- Streptococcal superantigen‐induced expansion of human tonsil T cells leads to altered T follicular helper cell phenotype, B cell death and reduced immunoglobulin release. Clinical & Experimental Immunology. View this article in WRRO
- Identification of two new core chromosome-encoded superantigens in Streptococcus pyogenes; speQ and speR. Journal of Infection. View this article in WRRO
- Impact of contusion injury on intramuscular emm1 group a streptococcus infection and lymphatic spread. Virulence, 9(1), 1074-1084. View this article in WRRO
- Proteomic analysis at the sites of clinical infection with invasive Streptococcus pyogenes. Scientific Reports, 8(1). View this article in WRRO
- The DNases of pathogenic Lancefield streptococci.. Microbiology, 164(3), 242-250. View this article in WRRO
- Clinical and Molecular Epidemiology of Staphylococcal Toxic Shock Syndrome in the United Kingdom. Emerging Infectious Diseases, 24(2). View this article in WRRO
- Community outbreaks of group A Streptococcus revealed by genome sequencing. Scientific Reports, 7(1). View this article in WRRO
- Enhanced nasopharyngeal infection and shedding associated with an epidemic lineage of emm3 group A Streptococcus. Virulence, 8(7), 1390-1400. View this article in WRRO
- Corrigendum: Emergence of a novel lineage containing a prophage in emm/M3 group A Streptococcus associated with upsurge in invasive disease in the UK. Microbial Genomics, 2(11).
- Emergence of a novel lineage containing a prophage in emm/M3 group A Streptococcus associated with upsurge in invasive disease in the UK. Microbial Genomics, 2(6). View this article in WRRO
- Scarlet Fever Upsurge in England and Molecular-Genetic Analysis in North-West London, 2014. Emerging Infectious Diseases, 22(6), 1075-1078.
- Identification of commonly expressed exoproteins and proteolytic cleavage events by proteomic mining of clinically relevant UK isolates of Staphylococcus aureus. Microbial Genomics, 2(2). View this article in WRRO
- The effect of trauma on invasive group A streptococcal (IGAS) disease. Journal of Infection, 71(6), 686-686.
- Panton–Valentine leucocidin expression by Staphylococcus aureus exposed to common antibiotics. Journal of Infection, 71(3), 338-346.
- A Truncation in the Regulator RocA Underlies Heightened Capsule Expression in Serotype M3 Group A Streptococci. Infection and Immunity, 83(4), 1732-1733. View this article in WRRO
- Molecular Analysis of an Outbreak of Lethal Postpartum Sepsis Caused by Streptococcus pyogenes. Journal of Clinical Microbiology, 51(7), 2089-2095. View this article in WRRO
- P194 Molecular anatomy of invasive group A streptococcal (iGAS) isolates in England. International Journal of Antimicrobial Agents, 42, S103-S104.
- Streptococcus pyogenes superantigen SPEA expression suppresses all immunoglobulin classes in human tonsil explants. Journal of Infection, 61(6), 518-518.
- ERRATUM. The Journal of Infectious Diseases, 200(8), 1353-1353.
- Emerging Role of the Interleukin‐8 Cleaving Enzyme SpyCEP in ClinicalStreptococcus pyogenesInfection. The Journal of Infectious Diseases, 200(4), 555-563.
- Impact of immunization against SpyCEP during invasive disease with two streptococcal species: Streptococcus pyogenes and Streptococcus equi. Vaccine, 27(36), 4923-4929.
- The IL-8 Protease SpyCEP/ScpC of Group A Streptococcus Promotes Resistance to Neutrophil Killing. Cell Host & Microbe, 4(2), 170-178.
- Streptococcus pyogenes under pressure. Nature Medicine, 13(8), 909-910.
- Specific C‐Terminal Cleavage and Inactivation of Interleukin‐8 by Invasive Disease Isolates ofStreptococcus pyogenes. The Journal of Infectious Diseases, 192(5), 783-790.
- Turner et al. Reply to “Emergence of the Same Successful Clade among Distinct Populations of emm89 Streptococcus pyogenes in Multiple Geographic Regions”. mBio, 6(6). View this article in WRRO
- RocA Truncation Underpins Hyper-Encapsulation, Carriage Longevity and Transmissibility of Serotype M18 Group A Streptococci. PLoS Pathogens, 9(12), e1003842-e1003842.
- Non-Invasive Monitoring of Streptococcus pyogenes Vaccine Efficacy Using Biophotonic Imaging. PLoS ONE, 8(11), e82123-e82123. View this article in WRRO
- Correction: Inactivation of the CovR/S Virulence Regulator Impairs Infection in an Improved Murine Model of Streptococcus pyogenes Naso-Pharyngeal Infection. PLoS ONE, 8(9).
- Inactivation of the CovR/S Virulence Regulator Impairs Infection in an Improved Murine Model of Streptococcus pyogenes Naso-Pharyngeal Infection. PLoS ONE, 8(4), e61655-e61655.
- Superantigenic Activity of emm3 Streptococcus pyogenes Is Abrogated by a Conserved, Naturally Occurring smeZ Mutation. PLoS ONE, 7(10), e46376-e46376. View this article in WRRO
- Chemokine-cleaving Streptococcus pyogenes protease SpyCEP is necessary and sufficient for bacterial dissemination within soft tissues and the respiratory tract. Molecular Microbiology, 76(6), 1387-1397.
- Lymphatic Metastasis of Virulent Extracellular Bacteria Drives Systemic Infection. SSRN Electronic Journal. View this article in WRRO
- Emergence of a New Highly Successful Acapsular Group A Streptococcus Clade of Genotype emm89 in the United Kingdom. mBio, 6(4). View this article in WRRO
- Streptococci and Enterococci, Infectious Diseases (pp. 1523-1536.e2). Elsevier
- Streptococci and Enterococci In Cohen J, Powderly W & Opal S (Ed.), Infectious Diseases 4th edition Elsevier
- Pathogenicity Factors in Group C and G Streptococci, Gram-Positive Pathogens (pp. 264-274). ASM Press