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Lacasse M, Valentin AS, Corvec S, Bémer P, Jolivet-Gougeon A, Plouzeau C, Tandé D, Mereghetti L, Bernard L, Lartigue MF. Genotypic Characterization and Biofilm Production of Group B Streptococcus Strains Isolated from Bone and Joint Infections. Microbiol Spectr 2022; 10:e0232921. [PMID: 35357222 PMCID: PMC9045227 DOI: 10.1128/spectrum.02329-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 02/07/2022] [Indexed: 11/20/2022] Open
Abstract
Bone and joint infections (BJI) represent the second cause of invasive Group B Streptococcus (GBS) infections. Biofilm formation plays a major role in BJI. This study's aim was to analyze the genetic features and biofilm production of GBS strains. In six French laboratories, 77 GBS strains isolated from BJI and 57 strains from vaginal human colonization (Hcol) were characterized and compared by Multi-Locus Sequence Typing (MLST). PCR was used to search for the adhesins (bsaB, lmb, scpB, fbsA, fbsB, hvgA, bibA, bca, srr-1, and srr-2) and Pilus Islands (PI) related genes (PI-1, PI-2a, PI-2b). Biofilm production was studied by crystal violet assay. Strains were categorized into three groups, based on Specific Biofilm Formation (SBF) values defined as: weak, moderate, or strong producers. Molecular study revealed three major clonal complexes (CC) in BJI strains: CC1 (42%), CC23 (22%) and CC10 (14%). Several associations between CC and adhesin/pili were identified: CC1 with srr2, PI-1 + 2a; CC10 with srr-1, bca, PI-1 + 2a; CC17 with fbsB, hvgA, srr-2, PI-1+PI-2b; CC19 with bibA, srr-1, PI-1 + 2a; CC23 with fbsB, bibA, srr-1, PI-2a. The biofilm production was significantly different according to CC, adhesins and pili gene detection. CC10, CC23 and strains harboring fbsB produce more biofilm than CC1, PI-1 + 2a (independently). Finally, SBF values were significantly stronger for Hcol strains rather than for BJI strains (76% versus 40%). This study revealed that Hcol strains appeared to produce stronger biofilm than BJI strains, though they belonged to similar CCs and had the same adhesin and pili content. IMPORTANCE Bone and joint infections (BJI) are pathologies that can be life-threatening and result in compromised functional prognosis for patients. Relapses are common and often related to biofilm formation. Group B streptococci (GBS) BJI increased since the last decade. However, few data are available on this subject in the literature. Our study aims to highlight genotype and biofilm production of GBS isolates from BJI. Seventy-seven GBS strains isolated from BJI and 57 from asymptomatic human vaginal colonization were characterized by multilocus sequence typing (MLST), adhesins content, nature of the pili and the ability to form biofilm. Our results revealed that vaginal human colonization strains produced stronger biofilm than BJI strains, despite belonging to the same phylogenetic lineage and having the same adhesin and pili content.
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Affiliation(s)
| | - Anne-Sophie Valentin
- Université de Tours, INRAE, ISP, Tours, France
- Centre Hospitalier Universitaire de Tours, Service de Bactériologie, Virologie et Hygiène Hospitalière, Tours, France
| | - Stéphane Corvec
- University Hospital Center of Nantes, Bacteriology Department, Nantes University, Nantes, France
| | - Pascale Bémer
- University Hospital Center of Nantes, Bacteriology Department, Nantes University, Nantes, France
| | - Anne Jolivet-Gougeon
- University of Rennes, INSERM, University Hospital of Rennes, NUMECAN Institute (Nutrition Metabolisms and Cancer), Rennes, France
| | - Chloé Plouzeau
- Bacteriology-Hospital Hygiene Department, University Hospital of Poitiers, Poitiers University, Poitiers, France
| | - Didier Tandé
- Bacteriology-Hospital Hygiene Department, University Hospital of Brest, Brest University, Brest, France
| | - Laurent Mereghetti
- Université de Tours, INRAE, ISP, Tours, France
- Centre Hospitalier Universitaire de Tours, Service de Bactériologie, Virologie et Hygiène Hospitalière, Tours, France
| | - Louis Bernard
- Centre Hospitalier Universitaire de Tours, Service de Maladies infectieuses, Tours, France
| | - Marie-Frédérique Lartigue
- Université de Tours, INRAE, ISP, Tours, France
- Centre Hospitalier Universitaire de Tours, Service de Bactériologie, Virologie et Hygiène Hospitalière, Tours, France
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