Nature Communications (Mar 2024)

Inter-species gene flow drives ongoing evolution of Streptococcus pyogenes and Streptococcus dysgalactiae subsp. equisimilis

  • Ouli Xie,
  • Jacqueline M. Morris,
  • Andrew J. Hayes,
  • Rebecca J. Towers,
  • Magnus G. Jespersen,
  • John A. Lees,
  • Nouri L. Ben Zakour,
  • Olga Berking,
  • Sarah L. Baines,
  • Glen P. Carter,
  • Gerry Tonkin-Hill,
  • Layla Schrieber,
  • Liam McIntyre,
  • Jake A. Lacey,
  • Taylah B. James,
  • Kadaba S. Sriprakash,
  • Scott A. Beatson,
  • Tadao Hasegawa,
  • Phil Giffard,
  • Andrew C. Steer,
  • Michael R. Batzloff,
  • Bernard W. Beall,
  • Marcos D. Pinho,
  • Mario Ramirez,
  • Debra E. Bessen,
  • Gordon Dougan,
  • Stephen D. Bentley,
  • Mark J. Walker,
  • Bart J. Currie,
  • Steven Y. C. Tong,
  • David J. McMillan,
  • Mark R. Davies

DOI
https://doi.org/10.1038/s41467-024-46530-2
Journal volume & issue
Vol. 15, no. 1
pp. 1 – 14

Abstract

Read online

Abstract Streptococcus dysgalactiae subsp. equisimilis (SDSE) is an emerging cause of human infection with invasive disease incidence and clinical manifestations comparable to the closely related species, Streptococcus pyogenes. Through systematic genomic analyses of 501 disseminated SDSE strains, we demonstrate extensive overlap between the genomes of SDSE and S. pyogenes. More than 75% of core genes are shared between the two species with one third demonstrating evidence of cross-species recombination. Twenty-five percent of mobile genetic element (MGE) clusters and 16 of 55 SDSE MGE insertion regions were shared across species. Assessing potential cross-protection from leading S. pyogenes vaccine candidates on SDSE, 12/34 preclinical vaccine antigen genes were shown to be present in >99% of isolates of both species. Relevant to possible vaccine evasion, six vaccine candidate genes demonstrated evidence of inter-species recombination. These findings demonstrate previously unappreciated levels of genomic overlap between these closely related pathogens with implications for streptococcal pathobiology, disease surveillance and prevention.