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Valdezate S, Medina-Pascual MJ, Villalón P, Garrido N, Monzón S, Cuesta I, Cobo F. Co-occurrence of the cephalosporinase cepA and carbapenemase cfiA genes in a Bacteroides fragilis division II strain, an unexpected finding. J Antimicrob Chemother 2024:dkae166. [PMID: 38814812 DOI: 10.1093/jac/dkae166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Accepted: 05/07/2024] [Indexed: 06/01/2024] Open
Abstract
BACKGROUND Bacteroides fragilis, an anaerobic gut bacterium and opportunistic pathogen, comprises two genetically divergent groups (or divisions) at the species level. Differences exist both in the core and accessory genomes and the beta-lactamase genes, with the cephalosporinase gene cepA represented only in division I and the carbapenemase gene cfiA only in division II. METHODS Multidrug resistance in a clinical B. fragilis strain was examined by whole-genome sequencing. RESULTS Strain CNM20200260 carried the antimicrobial resistance genes cepA, cfiA2, ant(6'), erm(F), mef(En2), est(T), tet(Q) and cat(A), along with 82-Phe mutation in gyrA (together with 47 amino acid changes in gyrA/B and parC/parE). bexA/B and other efflux pump genes were also observed. None of the detected insertion sequences was located upstream of cfiA2. The genome-based taxonomy coefficients (average nucleotide identity, DNA-DNA hybridization similarity and difference in genomic G + C%) with respect to genomes of the strains of B. fragilis division II and the novel species Bacteroides hominis (both cfiA-positive) met the criteria for CNM20200260 to belong to either species (>95%, >70% and <1%, respectively). No such similarity was seen with type strain NCTC 9343 or the representative genome FDAARGOS 1225 of B. fragilis (division I, cfiA-negative). Strain CNM20200260 harboured four out of nine Kyoto Encyclopedia of Genes and Genomes orthologues defined for division I and one of two defined for division II. CONCLUSIONS This is the first description of the co-occurrence of cepA and cfiA in a Bacteroides strain, confirming the complexity of the taxonomy of this species.
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Affiliation(s)
- S Valdezate
- Reference and Research Laboratory for Taxonomy, National Centre of Microbiology, Instituto de Salud Carlos III, Majadahonda, Carretera Pozuelo-Majadahonda km 2.2, 28220, Madrid, Spain
| | - M J Medina-Pascual
- Reference and Research Laboratory for Taxonomy, National Centre of Microbiology, Instituto de Salud Carlos III, Majadahonda, Carretera Pozuelo-Majadahonda km 2.2, 28220, Madrid, Spain
| | - P Villalón
- Reference and Research Laboratory for Taxonomy, National Centre of Microbiology, Instituto de Salud Carlos III, Majadahonda, Carretera Pozuelo-Majadahonda km 2.2, 28220, Madrid, Spain
| | - N Garrido
- Reference and Research Laboratory for Taxonomy, National Centre of Microbiology, Instituto de Salud Carlos III, Majadahonda, Carretera Pozuelo-Majadahonda km 2.2, 28220, Madrid, Spain
| | - S Monzón
- Bioinformatics Unit, Applied Services, Training and Research, Instituto de Salud Carlos III, Majadahonda, Carretera Pozuelo-Majadahonda km 2.2, 28220, Madrid, Spain
| | - I Cuesta
- Bioinformatics Unit, Applied Services, Training and Research, Instituto de Salud Carlos III, Majadahonda, Carretera Pozuelo-Majadahonda km 2.2, 28220, Madrid, Spain
| | - F Cobo
- Department of Microbiology and Instituto Biosanitario de Granada, University Hospital of Virgen de las Nieves, Avda. Fuerzas Armadas s/n, 18014 Granada, Spain
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Wu X, Yang C, Sun F, Zhang Y, Wang Y, Li X, Zheng F. Enterotoxigenic Bacteroides fragilis (ETBF) Enhances Colorectal Cancer Cell Proliferation and Metastasis Through HDAC3/miR-139-3p Pathway. Biochem Genet 2024:10.1007/s10528-023-10621-4. [PMID: 38244157 DOI: 10.1007/s10528-023-10621-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Accepted: 12/03/2023] [Indexed: 01/22/2024]
Abstract
Enterotoxigenic Bacteroides fragilis (ETBF) is believed to promote the malignant process of colorectal cancer (CRC), but the underlying molecular mechanism still needs to be revealed. CRC cells (SW480 and HCT-116) were treated with ETBF strain. Cell proliferation, invasion and, migration were evaluated by cell counting kit 8 assay, EdU assay, colony formation assay, transwell assay, and wound healing assay. Protein expression was analyzed by western blot. MicroRNA (miR)-139-3p and histone deacetylase 3 (HDAC3) expression levels in tissues and cells were determined by qRT-PCR. Xenograft tumor model was conducted to evaluate the effect of miR-139-3p on CRC tumor growth. ETBF treatment could promote CRC cell proliferation, invasion and migration. MiR-139-3p expression was decreased by ETBF, and its overexpression reversed the effect of ETBF on CRC cell progression. HDAC3 negatively regulated miR-139-3p expression, and its overexpression facilitated CRC cell behaviors via reducing miR-139-3p expression. Moreover, HDAC3 expression was increased by ETBF, and its knockdown also abolished ETBF-mediated CRC cell progression. Additionally, miR-139-3p overexpression could reduce CRC tumor growth in vivo. ETBF aggravated CRC proliferation and metastasis via the regulation of HDAC3/miR-139-3p axis. The discovery of ETBF/HDAC3/miR-139-3p axis may provide a new direction for CRC treatment.
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Affiliation(s)
- Xiaoyong Wu
- Department of General Surgery, Affiliated Danzhou People's Hospital of Hainan Medical University, Danzhou City, Hainan, China
| | - Chengrui Yang
- Department of General Surgery, Affiliated Danzhou People's Hospital of Hainan Medical University, Danzhou City, Hainan, China
| | - Fangyuan Sun
- Department of General Surgery, Affiliated Danzhou People's Hospital of Hainan Medical University, Danzhou City, Hainan, China
| | - Yanzhong Zhang
- Department of General Surgery, Affiliated Danzhou People's Hospital of Hainan Medical University, Danzhou City, Hainan, China
| | - Yanliang Wang
- Department of General Surgery, Affiliated Danzhou People's Hospital of Hainan Medical University, Danzhou City, Hainan, China
| | - Xuzhao Li
- Department of Surgery, People's Hospital of Ningxia Hui Autonomous Region, Yinchuan, 750011, Ningxia, China
| | - Fengxian Zheng
- Department of Critical Care Medicine, Affiliated Danzhou People's Hospital of Hainan Medical University, No. 21-1, Datong Road, Nada Town, Danzhou City, 571747, Hainan, China.
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