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Pereira EM, de Mattos CS, Dos Santos OC, Ferreira DC, de Oliveira TLR, Laport MS, de Oliveira Ferreira E, Dos Santos KRN. Staphylococcus hominis subspecies can be identified by SDS-PAGE or MALDI-TOF MS profiles. Sci Rep 2019; 9:11736. [PMID: 31409863 PMCID: PMC6692339 DOI: 10.1038/s41598-019-48248-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Accepted: 07/26/2019] [Indexed: 11/30/2022] Open
Abstract
Staphylococcus hominis is part of the normal human microbiome. Two subspecies, S. hominis hominis (Shh) and S. hominis novobiosepticus (Shn), have clinical significance. Forty-nine S. hominis isolates were analyzed by the MicroScan automated system, SDS-PAGE and MALDI-TOF methods, followed by partial sequencing of the 16S rDNA gene. The trehalose fermentation test, disk diffusion and broth microdilution tests were used to identify (novobiocin test) and access the susceptibility to oxacillin and vancomycin of isolates. The SCCmec elements and genomic diversity were evaluated by PCR and PFGE methods, respectively. Profiles of 28 (57%; 8 Shh and 20 Shn) isolates corroborated with the results found in all the applied methods of identification. The remaining 21 (43%) isolates were phenotypically identified as Shh by MicroScan; however, they were identified as Shn by SDS-PAGE and mass spectral, and confirmed by 16S rDNA sequencing. Among 41 isolates identified as Shn by the molecular and mass spectrometry methods, 19 (41%) were novobiocin-sensitive, and the trehalose test indicated 11 positive isolates, which are considered atypical phenotypic results for this subspecies. In addition, 92.7% of the isolates identified as Shn by these methods carried mecA gene, while only 12.5% of the Shh isolates were positive. Together, the results highlighted the SDS-PAGE and MALDI-TOF MS methods as promising tools for discriminating S. hominis subspecies.
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Affiliation(s)
- Eliezer Menezes Pereira
- Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro (Campus Pinheiral), Rio de Janeiro, Brazil.,Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Claudio Simões de Mattos
- Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Olinda Cabral Dos Santos
- Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Dennis Carvalho Ferreira
- Faculdade de Odontologia, Universidade Veiga de Almeida, Faculdade de Odontologia, Universidade Estácio de Sá, Rio de Janeiro, Brazil
| | - Tamara Lopes Rocha de Oliveira
- Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marinella Silva Laport
- Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Eliane de Oliveira Ferreira
- Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Katia Regina Netto Dos Santos
- Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
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Characterization of Environmental Bacillus Isolates by Protein Fingerprinting and Random Amplified Polymorphic DNA Profiles. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s40011-015-0700-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Olendzki AN, Barros EM, Laport MS, Santos KRN, Giambiagi-deMarval M. Reliability of the MicroScan WalkAway PC21 panel in identifying and detecting oxacillin resistance in clinical coagulase-negative staphylococci strains. Eur J Clin Microbiol Infect Dis 2013; 33:29-33. [DOI: 10.1007/s10096-013-1923-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Accepted: 07/03/2013] [Indexed: 11/24/2022]
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Zhang L, Thomas JC, Miragaia M, Bouchami O, Chaves F, d’Azevedo PA, Aanensen DM, de Lencastre H, Gray BM, Robinson DA. Multilocus sequence typing and further genetic characterization of the enigmatic pathogen, Staphylococcus hominis. PLoS One 2013; 8:e66496. [PMID: 23776678 PMCID: PMC3679023 DOI: 10.1371/journal.pone.0066496] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Accepted: 05/06/2013] [Indexed: 11/18/2022] Open
Abstract
Staphylococcus hominis is a commensal resident of human skin and an opportunistic pathogen. The species is subdivided into two subspecies, S. hominis subsp. hominis and S. hominis subsp. novobiosepticus, which are difficult to distinguish. To investigate the evolution and epidemiology of S. hominis, a total of 108 isolates collected from 10 countries over 40 years were characterized by classical phenotypic methods and genetic methods. One nonsynonymous mutation in gyrB, scored with a novel SNP typing assay, had a perfect association with the novobiocin-resistant phenotype. A multilocus sequence typing (MLST) scheme was developed from six housekeeping gene fragments, and revealed relatively high levels of genetic diversity and a significant impact of recombination on S. hominis population structure. Among the 40 sequence types (STs) identified by MLST, three STs (ST2, ST16 and ST23) were S. hominis subsp. novobiosepticus, and they distinguished between isolates from different outbreaks, whereas 37 other STs were S. hominis subsp. hominis, one of which was widely disseminated (ST1). A modified PCR assay was developed to detect the presence of ccrAB4 from the SCCmec genetic element. S. hominis subsp. novobiosepticus isolates were oxacillin-resistant and carriers of specific components of SCCmec (mecA class A, ccrAB3, ccrAB4, ccrC), whereas S. hominis subsp. hominis included both oxacillin-sensitive and -resistant isolates and a more diverse array of SCCmec components. Surprisingly, phylogenetic analyses indicated that S. hominis subsp. novobiosepticus may be a polyphyletic and, hence, artificial taxon. In summary, these results revealed the genetic diversity of S. hominis, the identities of outbreak-causing clones, and the evolutionary relationships between subspecies and clones. The pathogenic lifestyle attributed to S. hominis subsp. novobiosepticus may have originated on more than one occasion.
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Affiliation(s)
- Liangfen Zhang
- Department of Microbiology, University of Mississippi Medical Center, Jackson, Mississippi, United States of America
| | - Jonathan C. Thomas
- Department of Microbiology, University of Mississippi Medical Center, Jackson, Mississippi, United States of America
| | - Maria Miragaia
- Laboratory of Molecular Genetics, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Ons Bouchami
- Laboratory of Molecular Genetics, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Fernando Chaves
- Servicio de Microbiología, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Pedro A. d’Azevedo
- Universidade Federal de Ciencias de Saude de Porto Alegre, Porto Alegre, Brazil
| | - David M. Aanensen
- Department of Infectious Disease Epidemiology, Imperial College London, London, United Kingdom
| | - Herminia de Lencastre
- Laboratory of Molecular Genetics, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Oeiras, Portugal
- Laboratory of Microbiology, The Rockefeller University, New York, New York, United States of America
| | - Barry M. Gray
- Department of Pediatrics, University of Illinois, Peoria, Illinois, United States of America
| | - D. Ashley Robinson
- Department of Microbiology, University of Mississippi Medical Center, Jackson, Mississippi, United States of America
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Santos OD, De Resende MCC, De Mello AL, Frazzon APG, D'Azevedo PA. The use of whole-cell protein profile analysis by SDS-PAGE as an accurate tool to identify species and subspecies of coagulase-negative staphylococci. APMIS 2011; 120:39-46. [PMID: 22151307 DOI: 10.1111/j.1600-0463.2011.02809.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We used sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) as a tool to characterize coagulase-negative staphylococci (CoNS). Of 253 clinical isolates and 10 control strains, five species and four subspecies were analyzed. All the isolates were identified using conventional phenotypic tests and SDS-PAGE. Discrepant results between these methods, as well as less common species and subspecies, were confirmed by sodA and 16S rDNA gene sequencing. Intraspecies similarities, calculated by the Dice coefficient, were significantly higher when compared to interspecies similarities. The conventional method failed to identify eight (3.2%) molecularly defined and SDS-PAGE-determined isolates. Therefore, SDS-PAGE was able to discriminate between all unidentified or misidentified isolates using a phenotypic method. In addition, SDS-PAGE identified all atypical isolates using biochemistry and CoNS at the subspecies level.
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Affiliation(s)
- Odelta Dos Santos
- Federal University of Health Science of Porto Alegre, UFCSPA, Brazil.
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