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Corynebacterium guaraldiae sp. nov.: a new species of Corynebacterium from human infections

  • Clinical Microbiology - Research Paper
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Abstract

Non-diphtheria Corynebacterium species (NDC) belonging to the human skin and mucosa microbiota are frequently neglected as contaminants. However, reports of human infections by Corynebacterium spp. have increased considerably in recent years. In this study, a group of six NDC isolates of urine (n = 5) and sebaceous cyst (n = 1) from two South American countries were identified at genus level or misidentified based on API® Coryne and genetic/molecular analyses. The 16S rRNA (99.09–99.56%) and rpoB (96.18–97.14%) gene sequence similarities of the isolates were higher when compared with Corynebacterium aurimucosum DSM 44532 T. Multilocus sequence analysis (MLSA) indicated that these six NDC isolates compose a distinctive phylogenetic clade. Genome-based taxonomic analysis with the whole-genome sequences was able to separate these six isolates from other known Corynebacterium type strains. Average nucleotide identity (ANI), average amino acid identity (AAI), and digital DNA–DNA hybridization (dDDH) values between closely related type strains and the six isolates were considerably lower than the currently recommended threshold values for species circumscription. Phylogenetic and genomic taxonomy analyses indicated these microorganisms as a novel Corynebacterium species, for which we formally propose the name Corynebacterium guaraldiae sp. nov. with isolate 13T (= CBAS 827T = CCBH 35012T) as type strain.

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Acknowledgements

We offer our deepest thanks to Raphael Hirata Jr. (In Memoriam), our eternal teacher and source of inspiration and to Rafael Sanches for his availability in advising on editing the image of this study. In addition, we thank CNPq for the research fellowship granted to LGCP.

Funding

This work was supported by Coordenação de Aperfeiçoamento de Pessoal do Ensino Superior (CAPES) # 88882.450376/2019–01, and # 88882.315426/2019–01, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) # E-26/202.087/2020, # E-26/210.889/2019, and # E-26/211.629/2015, Fundação Oswaldo Cruz (INOVA/FIOCRUZ) # 7481297331, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) # 309948/2018–5, and Secretaria de Ciencia y Técnica de la Universidad de Buenos Aires (UBACyT) # 20020170100109 BA.

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Contributions

LOS: Data curation; Formal analysis; Writing-original draft; Writing-review and editing; Investigation; Visualization. LSS: Data curation; Formal analysis; Writing-review and editing. MRBA: Writing-original draft; Investigation; Visualization. DJPR: Data curation; Formal analysis; Methodology. JNR: Data curation; Formal analysis; Writing-review and editing. PVPB: Data curation; Formal analysis; Writing-review and editing. PFDP: Writing-review and editing; Investigation; Resources. CCFL: Writing-review and editing; Investigation. RPS: Writing-original draft; Investigation. MA: Writing-review and editing; Investigation; Validation. CV: Data curation; Formal analysis; Writing-review and editing; Investigation; Methodology; Resources. CB: Data curation; Formal analysis; Writing-review and editing; Investigation; Methodology. VS: Data curation; Formal analysis; Writing-review and editing; Resources; Visualization; Validation. AB: Data curation; Formal analysis; Writing-review and editing; Resources; Visualization; Validation; Funding acquisition. ERGRA: Data curation; Formal analysis; Methodology. ALMG: Conceptualization; Writing-review and editing; Resources; Visualization; Funding acquisition. LGCP: Conceptualization; Data curation; Formal analysis; Writing-review and editing; Investigation; Methodology; Resources; Visualization; Validation; Funding acquisition; Project administration. VVV: Conceptualization; Data curation; Formal analysis; Writing-review and editing; Investigation; Methodology; Resources; Visualization; Validation; Funding acquisition; Project administration; Supervision.

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Correspondence to Lincoln de Oliveira Sant’Anna.

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This study was approved by Research Ethics Committee of Hospital Universitário Pedro Ernesto (CEP/HUPE– CAAE: 25847614.8.0000.5259).

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de Oliveira Sant’Anna, L., dos Santos, L.S., Araújo, M.R.B. et al. Corynebacterium guaraldiae sp. nov.: a new species of Corynebacterium from human infections. Braz J Microbiol 54, 779–790 (2023). https://doi.org/10.1007/s42770-023-00938-y

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