Publicação
Unveiling novel lytic bacteriophages as natural biocontrol agents against multidrug-resistant Escherichia coli: isolation, characterization, and in vitro application
| Resumo: | The alarming findings presented in the latest WHO report on the global antimicrobial resistance crisis have redirected scientific attention toward phage-based approaches as a renewed line of defense against multidrug-resistant (MDR) bacteria. In this study, four bacteriophages infecting a MDR-Escherichia coli strain were isolated from water sources and subjected to detailed phenotypic and genomic characterization. All phages efficiently inhibited MDR-E. coli at MOIs of 0.1 and 0.01, showing high stability across a broad temperature (465 °C) and pH (410) range. TEM analysis revealed that all phages exhibited a podovirus-morphotype. At 4 °C, titers remained stable for 6 months, with only a 12 log reduction -over a year. Notably, phage Sem4 exhibited markedly stronger lytic activity than the phage cocktail, fully suppressing bacterial growth. In tap water, phage Sem4 treatment reduced bacterial counts from 10 to 7 × 10 CFU/mL within 8 h, with no detectable colonies at 2448 h. Genomic analysis showed that these phages possess linear dsDNA genomes of 44,24445,205 bp, with ~ 45% GC content. Phylogenetic and comparative analyses classified them as novel Vectrevirus members within the Molineuxvirinae subfamily of the Autographiviridae family, sharing less than 95% intergenomic similarity with known Vectrevirus species. No genes associated with antibiotic resistance, toxins, or lysogeny were detected. These findings underscore the potential of - phages as a promising candidate for the development of next-generation biocontrol strategies, especially marking the efficiency of Sem4 in water sanitation systems, paving the way for sustainable and targeted interventions against MDR bacterial contamination. |
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| Autores principais: | Tasdurmazli, Semra |
| Outros Autores: | Erdogdu, Berna; Saghrouchni, Hamza; Var, Isil; Melo, Luís Daniel Rodrigues; Ozbek, Tulin |
| Assunto: | Bacteriophages Biocontrol Multidrug-resistant Escherichia coli Water sanitation |
| Ano: | 2026 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | The alarming findings presented in the latest WHO report on the global antimicrobial resistance crisis have redirected scientific attention toward phage-based approaches as a renewed line of defense against multidrug-resistant (MDR) bacteria. In this study, four bacteriophages infecting a MDR-Escherichia coli strain were isolated from water sources and subjected to detailed phenotypic and genomic characterization. All phages efficiently inhibited MDR-E. coli at MOIs of 0.1 and 0.01, showing high stability across a broad temperature (465 °C) and pH (410) range. TEM analysis revealed that all phages exhibited a podovirus-morphotype. At 4 °C, titers remained stable for 6 months, with only a 12 log reduction -over a year. Notably, phage Sem4 exhibited markedly stronger lytic activity than the phage cocktail, fully suppressing bacterial growth. In tap water, phage Sem4 treatment reduced bacterial counts from 10 to 7 × 10 CFU/mL within 8 h, with no detectable colonies at 2448 h. Genomic analysis showed that these phages possess linear dsDNA genomes of 44,24445,205 bp, with ~ 45% GC content. Phylogenetic and comparative analyses classified them as novel Vectrevirus members within the Molineuxvirinae subfamily of the Autographiviridae family, sharing less than 95% intergenomic similarity with known Vectrevirus species. No genes associated with antibiotic resistance, toxins, or lysogeny were detected. These findings underscore the potential of - phages as a promising candidate for the development of next-generation biocontrol strategies, especially marking the efficiency of Sem4 in water sanitation systems, paving the way for sustainable and targeted interventions against MDR bacterial contamination. |
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