Project description:Streptococcus equi subspecies equi, strain 1691 grown on COBA streptococcal selective agar shows classical mucoid colony morphology in addition to a reduced capsule phenotype. This project aimed to identify changes in the transcriptional profile between the two morphologies.
Project description:Streptococcus equi subspecies equi (S. equi) is a major pathogen which cause strangles, a highly contagious respiratory infection, in horses and other equines. In this study, we purified the extracellular vesicles (EVs) of S. equi ATCC 39506 and evaluated them as vaccine candidates against S. equi infections in mice. Through immunization in an animal model and immunoprecipitation-mass spectrometry, we evaluated EV as vaccine candidates against S. equi infections and identified novel immunogenic proteins.
Project description:Streptococcus equi subspecies equi (S. equi) is a major pathogen which cause strangles, a highly contagious respiratory infection, in horses and other equines.In this study, we discovered potential vaccine candidates using comprehensive proteomics and reverse vaccinology. As the initial step, we divided proteome of S. equi ATCC 39506 into whole cell lysate, secretory proteome, membrane proteome and extracellular vesicle and then, comparative proteomic analysis was performed to characterize the functional features of the proteome. Especially, extracellular vesicle of S. equi was evaluated at the first time. Total 114 potential vaccine candidates (PVCs) were selected using reverse vaccinology and knowledge based annotations. Comprehensive proteomic analysis confirmed that 60 PVCs were identified in S. equi ATCC 39506. Particularly, 32 PVCs were enriched in the EV proteome, suggesting that this cellular fraction may serve as vaccine.
Project description:CsrRS is a two component regulator which is known to regulate 10-18 % of the genome of the closely related Streptococcus pyogenes. We aimed to look for transcriptional differences between pairs of naturally occurring Streptococcus equi strains where one possessed a SNP in csrRS whereas the other did not. Such SNPs have not been identified in isolates from acute disease but have been identified in persistent isolates.
Project description:Placentitis was induced in six mares at approximately 290d of gestation (placentitis group), and six mares with gestationally age-matched (290 d) pregnancies did not receive any treatment (control group). For induction of placentitis in the former group, Streptococcus equi subsp. zooepidemicus was introduced intracervically.
Project description:Placentitis was induced in five mares at approximately 290d of gestation (placentitis group), four mares with gestationally age-matched (290 d) pregnancies did not receive any treatment (control group), and the remaining three mares were maintained until approximately 330 d of gestation (prepartum group). For induction of placentitis in the former group, Streptococcus equi subsp. zooepidemicus was introduced intracervically.
Project description:Placentitis was induced in five mares at approximately 290d of gestation (placentitis group), four mares with gestationally age-matched (290 d) pregnancies did not receive any treatment (control group), and the remaining three mares were maintained until approximately 330 d of gestation (prepartum group). For induction of placentitis in the former group, Streptococcus equi subsp. zooepidemicus was introduced intracervically.
Project description:Placentitis was induced in five mares at approximately 290d of gestation (placentitis group), four mares with gestationally age-matched (290 d) pregnancies did not receive any treatment (control group), and the remaining three mares were maintained until approximately 330 d of gestation (prepartum group). For induction of placentitis in the former group, Streptococcus equi subsp. zooepidemicus was introduced intracervically.
