Genomic evidence for the evolution of Streptococcus equi: host restriction, increased virulence, and genetic exchange with human pathogens.

Abstract:

:The continued evolution of bacterial pathogens has major implications for both human and animal disease, but the exchange of genetic material between host-restricted pathogens is rarely considered. Streptococcus equi subspecies equi (S. equi) is a host-restricted pathogen of horses that has evolved from the zoonotic pathogen Streptococcus equi subspecies zooepidemicus (S. zooepidemicus). These pathogens share approximately 80% genome sequence identity with the important human pathogen Streptococcus pyogenes. We sequenced and compared the genomes of S. equi 4047 and S. zooepidemicus H70 and screened S. equi and S. zooepidemicus strains from around the world to uncover evidence of the genetic events that have shaped the evolution of the S. equi genome and led to its emergence as a host-restricted pathogen. Our analysis provides evidence of functional loss due to mutation and deletion, coupled with pathogenic specialization through the acquisition of bacteriophage encoding a phospholipase A(2) toxin, and four superantigens, and an integrative conjugative element carrying a novel iron acquisition system with similarity to the high pathogenicity island of Yersinia pestis. We also highlight that S. equi, S. zooepidemicus, and S. pyogenes share a common phage pool that enhances cross-species pathogen evolution. We conclude that the complex interplay of functional loss, pathogenic specialization, and genetic exchange between S. equi, S. zooepidemicus, and S. pyogenes continues to influence the evolution of these important streptococci.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Holden MT,Heather Z,Paillot R,Steward KF,Webb K,Ainslie F,Jourdan T,Bason NC,Holroyd NE,Mungall K,Quail MA,Sanders M,Simmonds M,Willey D,Brooks K,Aanensen DM,Spratt BG,Jolley KA,Maiden MC,Kehoe M,Chanter N,Bentl

doi

10.1371/journal.ppat.1000346

subject

Has Abstract

pub_date

2009-03-01 00:00:00

pages

e1000346

issue

3

eissn

1553-7366

issn

1553-7374

journal_volume

5

pub_type

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