Complete Genome Analysis of Highly Pathogenic Non-O1/O139 Vibrio cholerae Isolated From Macrobrachium rosenbergii Reveals Pathogenicity and Antibiotic Resistance-Related Genes

Non-O1/O139 Vibrio cholerae is a highly virulent pathogen that causes mass mortalities of various aquatic animals. In the present study, we sequenced the whole genome of non-O1/O139 V. cholerae GXFL1-4, isolated from Macrobrachium rosenbergii, to reveal the pathogenicity and antibiotic resistance. The result showed its genome contained two circular chromosomes and one plasmid with a total size of 4,282,243 bp, which harbored 3,869 coding genes. Among them, 3,047, 2,659, and 3,661 genes were annotated in the Clusters of Orthologous Genes (COG), Gene Ontology (GO), and Kyoto Encyclopedia of Genes and Genomes (KEGG), respectively. In addition, 372 potential virulence genes were predicted based on the Virulence Factor Database (VFDB) database, such as type II, III, IV, and VI secretion systems related genes, flagella genes, and pilus formation or motility-related genes. Blast results in the Comprehensive Antibiotic Resistance Database (CARD) database showed that the strain contained 148 antibiotic resistance-related genes belonging to 27 categories, such as efflux pump complex antibiotic resistance genes and antibiotic resistance gene cluster genes. The Pathogen-Host Interaction (PHI) database annotated 320 genes related to pathogen-host interaction, such as T3SS, virulence regulatory factors, transcriptional regulators, and two-component response regulator related genes. The whole-genome analysis suggested that the pathogenic non-O1/O139 V. cholerae strain GXFL1-4 might have a complex molecular mechanism of pathogenicity and antibiotic resistance. This study provides a wealth of information about non-O1/O139 V. cholerae genes related to its pathogenicity and drug resistance and will facilitate the understanding of its pathogenesis as well as the development of prevention and treatment strategies for the pathogen.