Complete genome sequence ofVibrio parahaemolyticusFORC_023 isolated from raw fish storage water

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Abstract

Vibrio parahaemolyticus is a Gram-negative halophilic bacterium that causes food-borne gastroenteritis in humans who consume V. parahaemolyticus-contaminated seafood. The FORC_023 strain was isolated from raw fish storage water, containing live fish at a sashimi restaurant. Here, we aimed to sequence and characterize the genome of the FORC_023 strain. The genome of the FORC_023 strain showed two circular chromosomes, which contained 4227 open reading frames (ORFs), 131 tRNA genes and 37 rRNA genes. Although the genome of FORC_023 did not include major virulence genes, such as genes encoding thermostable direct hemolysin (TDH) and TDH-related hemolysin (TRH), it contained genes encoding other hemolysins, secretion systems, iron uptake-related proteins and several V. parahaemolyticus islands. The highest average nucleotide identity value was obtained between the FORC_023 strain and UCM-V493 (CP007004–6). Comparative genomic analysis of FORC_023 with UCM-V493 revealed that FORC_023 carried an additional genomic region encoding virulence factors, such as repeats-in-toxin and type II secretion factors. Furthermore, in vitro cytotoxicity testing showed that FORC_023 exhibited a high level of cytotoxicity toward INT-407 human epithelial cells. These results suggested that the FORC_023 strain may be a food-borne pathogen.

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