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. 2023 Mar;46(3):247-259.
doi: 10.1111/jfd.13739. Epub 2022 Dec 14.

Contribution of flagellar cap gene in virulence and pathogenicity of Aeromonas veronii

Zhao Cheng  1 , Xianliang Zhao  1 , Xinyu Jiang  1 , Jie Zhang  1 , Li Li  1 , Chao Pei  1 , Yong Zhou  2 , Lingbing Zeng  2 , Xianghui Kong  1
Affiliations

Contribution of flagellar cap gene in virulence and pathogenicity of Aeromonas veronii

Zhao Cheng et al. J Fish Dis. 2023 Mar.

Abstract

Aeromonas veronii is an important zoonotic and aquatic pathogen that causes a number of illnesses in both humans and animals. It is related to gastroenteritis, skin and soft tissue infections and bacteremia in humans, as well as causing significant economic losses in aquaculture owing to fish sepsis. Here, we constructed the flagellar cap gene (fliD) mutant strain of A. veronii by suicide plasmid-mediated homologous recombination system and analysed its characteristics. It was found that the deletion of fliD had no effect on growth and biochemical properties and could be inherited stably. However, the motility of A. veronii ΔfliD was significantly reduced, the flagellum was defective and the biofilm formation was attenuated compared with that of A. veronii wild-type strain. In vivo experiments revealed that the colonization capacity of ΔfliD was significantly lower than that of the wild-type strain in the period of first 24 h, and the median lethal dose (LD50 ) was 56 times higher than that of the wild-type strain. The Cyprinus carpio infected with the wild-type strain indicated faster death speed and more severe clinical signs compared to ΔfliD strain. These results suggest that fliD is closely related to the virulence of A. veronii and plays an important role in pathogenicity, providing the foundation for pathogenic mechanism studies of A. veronii.

Keywords: Aeromonas veronii; flagellar cap; pathogenicity; virulence.

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References

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