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Life sciences · Journal article
Synthetic and Systems Biotechnology · August 24, 2026
Early or partial results. Treat as a signal, not a conclusion.
This study describes identification and optimization of a recombineering system (BAS_MS17) for Edwardsiella piscicida, achieving 100% editing accuracy and demonstrating successful knockout of ten genes. The work establishes a technical platform for genetic manipulation of an aquaculture pathogen but does not provide evidence of clinical efficacy or superiority over existing methods in a controlled trial.
Experimental methods development study with systematic optimization across bacterial strains. Two laboratory strains of Edwardsiella piscicida (EIB202Δp and sdu12S); cultured in Luria–Bertani medium at 30 °C.. Intervention: BAS_MS17 recombineering system with modular optimization: homology arm length (150 bp or 200 bp), addition of Redg or Plug proteins, and use of endogenous rSSB or heterologous SSB proteins.. Compared with: Baseline BAS_MS17 without additives; deletion of phage-derived SSB; expression of SSB proteins from heterologous hosts; prior λ-Red recombineering method (cited from literature).. State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China, and College of Food Science, Tibet Agriculture and Animal Husbandry University, China..
BAS_MS17 system exhibited the highest recombination efficiency among six recombinase pairs tested Extending homology arms from 150 bp to 200 bp improved editing efficiency by 2-fold in E. piscicida EIB202Δp Addition of Redg or Plug enhanced recombination by 3-fold and 2.5-fold respectively in EIB202Δp; by 8-fold and 7-fold respectively in E. piscicida sdu12S
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This work provides a molecular tool for studying E. piscicida pathogenesis and constructing attenuated vaccine candidates. Clinicians and researchers should view this as enabling technology rather than direct evidence of therapeutic efficacy; the candidate vaccine strains require further evaluation for safety and immunogenicity.
This is a proof-of-concept study describing development and optimization of a new genetic tool in a bacterial model system, with successful gene knockouts demonstrated but no clinical or translational validation beyond candidate strain construction.
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This work provides a molecular tool for studying E. piscicida pathogenesis and constructing attenuated vaccine candidates. Clinicians and researchers should view this as enabling technology rather than direct evidence of therapeutic efficacy; the candidate vaccine strains require further evaluation for safety and immunogenicity.
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Edwardsiella species are important aquaculture pathogens that also cause opportunistic infections in humans, necessitating efficient genome editing tools to study their pathogenesis and develop control strategies. In this study, we identified and characterized six endogenous recombinases pairs from Edwardsiella and its phages. Among these, the BAS_MS17 system exhibited the highest recombination efficiency in E. piscicida EIB202Δp. Extending homology arms from 150 bp to 200 bp improved editing efficiency by 2-fold, while the addition of Redg or Plug further enhanced recombination by 3-fold and 2.5-fold, respectively, without compromising accuracy (100%). More importantly, when applied to E. piscicida sdu12S, Redg or Plug improved the editing efficiency by 8-fold and 7-fold, respectively. Deletion of the phage-derived single-strand binding protein (SSB) reduced efficiency to 25% of the BAS_MS17 level, whereas expression of the endogenous RecA-family SSB (rSSB) increased recombinant yield by 5-fold, highlighting functional conservation. Furthermore, SSB proteins from heterologous hosts failed to enhance recombination efficiency. Using the optimized system, we successfully knocked out ten distinct genes, including virulence-associated loci, with editing accuracy exceeding 85%. Phenotypic analysis revealed that luxR, but not the other tested genes, contributes to biofilm formation. Virulence evaluation results showed that aroA, fur, and hfq are critical virulence-associated factors. Collectively, this streamlined recombineering system provides a simple, rapid, and efficient genetic tool for Edwardsiella, supporting mechanistic studies of virulence and the development of live attenuated vaccine candidates.
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