Exploring the arthritogenicity of Streptococcus dysgalactiae subspecies equisimilis
Abstract Background During the past decades, Streptococcus dysgalactiae subspecies equisimilis (SDSE) has been increasingly recognized as an important human pathogen. Osteoarticular infections is one of the predominant disease manifestations of SDSE, but the pathogenetic rationale for its arthritoge...
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doaj-97426d0cb29644e2ae24da89e91cf7072020-11-25T02:00:08ZengBMCBMC Microbiology1471-21802018-02-0118111010.1186/s12866-018-1160-5Exploring the arthritogenicity of Streptococcus dysgalactiae subspecies equisimilisOddvar Oppegaard0Haima Mylvaganam1Steinar Skrede2Bård Reiakvam Kittang3Department of Medicine, Haukeland University HospitalDepartment of Microbiology, Haukeland University HospitalDepartment of Medicine, Haukeland University HospitalDepartment of Medicine, Haraldsplass Deaconess HospitalAbstract Background During the past decades, Streptococcus dysgalactiae subspecies equisimilis (SDSE) has been increasingly recognized as an important human pathogen. Osteoarticular infections is one of the predominant disease manifestations of SDSE, but the pathogenetic rationale for its arthritogenicity has yet to be unravelled. We aimed to explore if the rising incidence of osteoarticular infections caused by this pathogen in our region emanated from clonal expansion of strains with enhanced tropism for bone and joint tissue components or orthopaedic implants. Results Twenty-nine SDSE-isolates associated with osteoarticular infections were retrospectively identified. Their genomic content and affinity for fibronectin, collagen and stainless steel were compared to 24 temporally and geographically matched SDSE blood culture isolates obtained from patients without bone or joint infections. Despite a thorough genetic and phenotypic dissection, neither the presence or absence of any single gene, nor the binding abilities of the SDSE isolates, were predictive of clinical entity. SNP analysis revealed a heterogenous population, and a correlation between phylogenetic relationships and disease manifestation was not evident. However, we identified a strong concordance between phenotypic binding abilities and genetic variations in the pilus-region, also denoted as the FCT-region (Fibronectin binding, Collagen binding and T-antigen). This observation could be related to the ample and varied repertoire of putative adhesins residing within this region, including proteins predicted to adhere to fibronectin and collagen, as well as fibrinogen. Conclusions SDSE strains associated with osteoarticular infections do not emanate from subpopulation characterized by distinct genetic or phenotypic traits. The genetic architecture of the pilus region was predictive of the adhesive properties of the SDSE-isolates, but its role in tissue tropism needs further investigation. To the best of our knowledge, this is the first comprehensive characterization of the genetic landscape of the SDSE pilus region.http://link.springer.com/article/10.1186/s12866-018-1160-5Streptococcus dysgalactiae Subspecies equisimilisGroup C streptococcusGroup G streptococcusOsteoarticular infectionsSeptic arthritisTissue tropism |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Oddvar Oppegaard Haima Mylvaganam Steinar Skrede Bård Reiakvam Kittang |
spellingShingle |
Oddvar Oppegaard Haima Mylvaganam Steinar Skrede Bård Reiakvam Kittang Exploring the arthritogenicity of Streptococcus dysgalactiae subspecies equisimilis BMC Microbiology Streptococcus dysgalactiae Subspecies equisimilis Group C streptococcus Group G streptococcus Osteoarticular infections Septic arthritis Tissue tropism |
author_facet |
Oddvar Oppegaard Haima Mylvaganam Steinar Skrede Bård Reiakvam Kittang |
author_sort |
Oddvar Oppegaard |
title |
Exploring the arthritogenicity of Streptococcus dysgalactiae subspecies equisimilis |
title_short |
Exploring the arthritogenicity of Streptococcus dysgalactiae subspecies equisimilis |
title_full |
Exploring the arthritogenicity of Streptococcus dysgalactiae subspecies equisimilis |
title_fullStr |
Exploring the arthritogenicity of Streptococcus dysgalactiae subspecies equisimilis |
title_full_unstemmed |
Exploring the arthritogenicity of Streptococcus dysgalactiae subspecies equisimilis |
title_sort |
exploring the arthritogenicity of streptococcus dysgalactiae subspecies equisimilis |
publisher |
BMC |
series |
BMC Microbiology |
issn |
1471-2180 |
publishDate |
2018-02-01 |
description |
Abstract Background During the past decades, Streptococcus dysgalactiae subspecies equisimilis (SDSE) has been increasingly recognized as an important human pathogen. Osteoarticular infections is one of the predominant disease manifestations of SDSE, but the pathogenetic rationale for its arthritogenicity has yet to be unravelled. We aimed to explore if the rising incidence of osteoarticular infections caused by this pathogen in our region emanated from clonal expansion of strains with enhanced tropism for bone and joint tissue components or orthopaedic implants. Results Twenty-nine SDSE-isolates associated with osteoarticular infections were retrospectively identified. Their genomic content and affinity for fibronectin, collagen and stainless steel were compared to 24 temporally and geographically matched SDSE blood culture isolates obtained from patients without bone or joint infections. Despite a thorough genetic and phenotypic dissection, neither the presence or absence of any single gene, nor the binding abilities of the SDSE isolates, were predictive of clinical entity. SNP analysis revealed a heterogenous population, and a correlation between phylogenetic relationships and disease manifestation was not evident. However, we identified a strong concordance between phenotypic binding abilities and genetic variations in the pilus-region, also denoted as the FCT-region (Fibronectin binding, Collagen binding and T-antigen). This observation could be related to the ample and varied repertoire of putative adhesins residing within this region, including proteins predicted to adhere to fibronectin and collagen, as well as fibrinogen. Conclusions SDSE strains associated with osteoarticular infections do not emanate from subpopulation characterized by distinct genetic or phenotypic traits. The genetic architecture of the pilus region was predictive of the adhesive properties of the SDSE-isolates, but its role in tissue tropism needs further investigation. To the best of our knowledge, this is the first comprehensive characterization of the genetic landscape of the SDSE pilus region. |
topic |
Streptococcus dysgalactiae Subspecies equisimilis Group C streptococcus Group G streptococcus Osteoarticular infections Septic arthritis Tissue tropism |
url |
http://link.springer.com/article/10.1186/s12866-018-1160-5 |
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