ArticleMolecular biology reports2022
Survey on phenotypic resistance in Enterococcus faecalis: comparison between the expression of biofilm-associated genes in Enterococcus faecalis persister and non-persister cells.
Article in Molecular biology reports, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers, 1 of them a synthesis that pooled it.
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Who cites it
8 citing papers in PubMed, 1 synthesis or guideline pooled it, 9 citations in OpenAlex.
- Association of virulence genes with biofilm formation in clinical Enterococcus faecalis isolates: a systematic review and meta-analysis.Archives of microbiology · 2026Pooled it
- Candidate Genomic Features Associated with Persistence inMicroorganisms · 2026Article
- Molecular mechanisms of virulence in Enterococcus faecium: integrating Esp, Acm, regulatory RNA networks in multidrug resistant nosocomial infections.Archives of microbiology · 2026Review
- Pheromone cCF10 inhibits the antibiotic persistence ofFrontiers in microbiology · 2024Article
- Antibiotic heteroresistance and persistence: an additional aid in hospital acquired infections byFuture microbiology · 2024Review
- Bactericidal synergism between phage endolysin Ply2660 and cathelicidin LL-37 against vancomycin-resistant Enterococcus faecalis biofilms.NPJ biofilms and microbiomes · 2023Article
- Enterococcus faecalis rnc gene modulates its susceptibility to disinfection agents: a novel approach against biofilm.BMC oral health · 2022Article
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Authors and funding
7 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundPhenotypic resistance is considered as a serious therapeutic challenge for which a definitive remedy has not been discovered yet. Biofilm and persister cell formation are two well-studied phenotypic resistance phenomena, leading to the recalcitrance and relapse of different types of chronic infections. The presence of persister cells in biofilm structures seems to be one of the main factors contributing to the relapse of infections and treatment failure. Given the dormant and inert nature of persister cells, they can be easy targets for the immune system factors. Biofilm formation can be a survival strategy for the defenseless persister cells. Thus, this study was aimed to evaluate the expression of biofilm-associated genes in Enterococcus faecalis persister and non-persister cells.
methodsVancomycin susceptibility and biofilm formation ability were investigated among 95 E. faecalis clinical isolates using microtiter broth dilution and microtiter plate assays, respectively. PCR was used to determine the presence of biofilm-related genes (gelE, esp, and agg) among the vancomycin-susceptible, biofilm producer E. faecalis isolates (91 isolates). Minimum bactericidal concentration for biofilms (MBCB) were determined for vancomycin using the MTP assay. Bacterial persister assay was performed using an enzymatic lysis assay. Finally, the expression of biofilm-related genes was compared between the persister and non-persister isolates of E. faecalis using real-time qPCR.
resultsE. faecalis isolates showed a high level of susceptibility (95.8%) to vancomycin (MIC < 1 µg/mL). The gelE, esp, and agg genes were found in 91 (100%), 72 (79.12), and 74 (81.32) of the isolates, respectively. All the E. faecalis isolates were tolerant to vancomycin in the biofilm condition, showing a MBCB of > 2500 µg/mL. Based on the enzymatic lysis assay, only 3 isolates, out of the 91, had the ability to form persister cells. The expression of biofilm-associated genes was higher among the persister compared to non-persister E. faecalis isolates.
conclusionsBiofilm-associated persister cells indicated a high vancomycin tolerance compared to non-persister cells. Moreover, persister isolates showed a higher tendency for biofilm formation and a higher expression level of the biofilm-associated genes, compared to non-persister isolates.
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