Extensive genetic diversity among clinical isolates of Streptococcus pyogenes serotype M5

Meeta Desai, Asha Tanna, Androulla Efstratiou, Robert George, Jonathan Clewley, John Stanley

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The genetic diversity of clinical isolates of Streptococcus pyogenes serotype M5 has been characterized. Strain genotypes were defined by macrorestriction profile, 16S ribotype, emm gene subtype, insertion element IS1239 profile, and exotoxin gene determinant. By these criteria, clinical isolates of M5 constituted a multiplicity of strain clusters rather than a homogeneous population as found for certain serotypes. Distance matrices and an unrooted tree were constructed from macrorestriction data with three rarely cutting endonucleases, determined by PFGE. A single IS1239 profile was common to 85% of isolates but there was great diversity of both ribotype and macrorestriction profile, and 18 different emm gene subtypes were detected by PCR-RFLP. DNA sequence analysis of the antigen-coding 5' (hypervariable) region of emm gene amplicons (about 240 bp) showed that 14/18 exhibited up to 6% divergence. Four amplicons had highly divergent sequences corresponding to those previously determined for emm 6, emm 11, emm 18 and emm77. Further serological and hybridization studies were used to analyse the discrepancy between the Lancefield serotype of these strains (M5) and their emm genotype. Overall, this study shows a high degree of genetic diversity in serotype M5, with implications for the Lancefield scheme itself, for the epidemiology of group A streptococci, and for recombinant DNA strategies for M protein-based vaccine development.

Original languageEnglish (US)
Pages (from-to)629-637
Number of pages9
JournalMicrobiology
Volume144
Issue number3
DOIs
StatePublished - Mar 1998

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Streptococcus pyogenes
Ribotyping
Genotype
Genes
Exotoxins
Recombinant DNA
Insertional Mutagenesis
Endonucleases
Streptococcus
DNA Sequence Analysis
Restriction Fragment Length Polymorphisms
Epidemiology
Vaccines
Antigens
Polymerase Chain Reaction
Serogroup
Population
Proteins

All Science Journal Classification (ASJC) codes

  • Microbiology

Cite this

Desai, Meeta ; Tanna, Asha ; Efstratiou, Androulla ; George, Robert ; Clewley, Jonathan ; Stanley, John. / Extensive genetic diversity among clinical isolates of Streptococcus pyogenes serotype M5. In: Microbiology. 1998 ; Vol. 144, No. 3. pp. 629-637.
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Desai, M, Tanna, A, Efstratiou, A, George, R, Clewley, J & Stanley, J 1998, 'Extensive genetic diversity among clinical isolates of Streptococcus pyogenes serotype M5', Microbiology, vol. 144, no. 3, pp. 629-637. https://doi.org/10.1099/00221287-144-3-629

Extensive genetic diversity among clinical isolates of Streptococcus pyogenes serotype M5. / Desai, Meeta; Tanna, Asha; Efstratiou, Androulla; George, Robert; Clewley, Jonathan; Stanley, John.

In: Microbiology, Vol. 144, No. 3, 03.1998, p. 629-637.

Research output: Contribution to journalArticle

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