journal article Mar 02, 2023

Comparative genomic analysis provides insights into taxonomy and temperature adaption of Aeromonas salmonicida

Journal of Fish Diseases Vol. 46 No. 5 pp. 545-561 · Wiley
View at Publisher Save 10.1111/jfd.13767
Abstract
AbstractAeromonas salmonicida has long been known as psychrophiles since it is mainly isolated from cold water fish, and recent reports have revealed the existence of mesophilic strains isolated from warm sources. However, the genetic differences between mesophilic and psychrophilic strains remain unclear due to few complete genomes of mesophilic strain are available. In this study, six A. salmonicida (2 mesophilic and 4 psychrophilic) were genome‐sequenced, and comparative analyses of 25 A. salmonicida complete genomes were conducted. The ANI values and phylogenetic analysis revealed that 25 strains formed three independent clades, which were referred as typical psychrophilic, atypical psychrophilic and mesophilic groups. Comparative genomic analysis showed that two chromosomal gene clusters, related to lateral flagella and outer membrane proteins (A‐layer and T2SS proteins), and insertion sequences (ISAs4, ISAs7 and ISAs29) were unique to the psychrophilic groups, while the complete MSH type IV pili were unique to the mesophilic group, all of which may be considered as lifestyle‐related factors. The results of this study not only provide new insights into the classification, lifestyle adaption and pathogenic mechanism of different strains of A. salmonicida, but also contributes to the prevention and control of disease caused by psychrophilic and mesophilic A. salmonicida.
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Published
Mar 02, 2023
Vol/Issue
46(5)
Pages
545-561
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Meng Long, Huimin Fan, Zhen Gan, et al. (2023). Comparative genomic analysis provides insights into taxonomy and temperature adaption of Aeromonas salmonicida. Journal of Fish Diseases, 46(5), 545-561. https://doi.org/10.1111/jfd.13767