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Bacterial biofilms are intricate ecosystems of microbial communities that adhere to various surfaces and are enveloped by an extracellular matrix composed of polymeric substances. Within the context of bacterial biofilms, extracellular DNA (eDNA) originates from cell lysis or is actively secreted, where it exerts a significant influence on the formation, stability, and resistance of biofilms to environmental stressors. The exploration of eDNA within bacterial biofilms holds paramount importance in research, with far-reaching implications for both human health and the environment. An enhanced understanding of the functions of eDNA in biofilm formation and antibiotic resistance could inspire the development of strategies to combat biofilm-related infections and improve the management of antibiotic resistance. This comprehensive review encapsulates the latest discoveries concerning eDNA, encompassing its origins, functions within bacterial biofilms, and significance in bacterial pathogenesis.
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http://dx.doi.org/10.1128/jb.00006-24 | DOI Listing |
PLoS One
September 2025
Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka, Bangladesh.
Objectives: Antibiotic resistance towards penicillin has been attempted to counter by chemically modifying ampicillin through the conjugation with silver nanoparticles (AgNPs). The current study optimizes the conditions for synthesizing and characterizing AgNP-ampicillin to quantify the conjugation extent, evaluate the antibacterial efficacy, and explore the underlying antibacterial mechanisms.
Materials And Methods: AgNPs were synthesized from silver nitrate by chemical reduction method, silica-coated with tetraethyl orthosilicate (TEOS) and amine functionalized by (3-aminopropyl) triethoxysilane (APTES), which was then conjugated with ampicillin via the carbodiimide chemistry.
PLoS One
September 2025
Department of Microbiology and Parasitology, Faculty of Biology - Aquatic One Health Research Center (iARCUS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
Uropathogenic Escherichia coli (UPEC) are among the first pathogens to colonise in catheter and non-catheter-associated urinary tract infections. However, these infections are often polymicrobial, resulting in multi-species infections that persist by forming biofilms. Living within these highly antimicrobial tolerant communities, bacteria can establish intra- and inter-specific interactions, including quorum sensing (QS)-mediated signalling mechanisms, which play a key role in biofilm establishment and maturation.
View Article and Find Full Text PDFJ Med Microbiol
September 2025
Department of Microbiology, Meiji Pharmaceutical University, Tokyo, Japan.
Biofilms are a primary form of device-associated infections and typically exhibit high tolerance to antimicrobial agents. In biofilms formed by multiple microbial species, microorganisms may show even greater tolerance, complicating treatment. There is evidence that meropenem (MEPM) tolerance in is increased in dual-species biofilms with , and effective treatments have not been established.
View Article and Find Full Text PDFProbiotics Antimicrob Proteins
September 2025
School of Life Science, Liaoning Normal University, Dalian, 116081, China.
Cutibacterium acnes (C. acnes, formerly classified as Propionibacterium acnes) is a Gram-positive bacterium that contributes to the development of acne vulgaris, resulting in inflammation and pustule formation on the skin. In this study, we developed and synthesized a series of antimicrobial peptides (AMPs) that are derived from the skin secretion of Rana chensinensis.
View Article and Find Full Text PDFCurr Microbiol
September 2025
Department of Health Sciences, Università del Piemonte Orientale UPO, Corso Trieste 15/A, 28100, Novara, Italy.
A Python-scripted software tool has been developed to help study the heterogeneity of gene changes, markedly or moderately expressed, when several experimental conditions are compared. The analysis workflow encloses a scorecard that groups genes based on relative fold-change and statistical significance, providing additional functions that facilitate knowledge extraction. The scorecard reports highlight unique patterns of gene regulation, such as genes whose expression is consistently up- or down-regulated across experiments, all of which are supported by graphs and summaries to characterize the dataset under investigation.
View Article and Find Full Text PDF