Genomic analysis of strain PH1009, a potential multi-drug resistant pathogen due to acquisition of toxin genes.

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ID: 280802
2023
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Abstract
In has increasingly been observed that viral and bacterial coinfection frequently occurs among cultured shrimp and this coinfection could exacerbate the disease phenotype. Here, we describe a newly discovered bacterial strain, PH1009 collected from Masbate Island, Philippines that was found to be co-infecting with the White Spot Syndrome virus in a sample of black tiger prawn, . The genome of PH1009 was sequenced, assembled, and annotated. Average Nucleotide identity calculation with strains confirmed its taxonomic identity. It is a potential multi-drug and multi-heavy metal resistant strain based on the multiple antibiotic and heavy metal resistance determinants annotated on its genome. Two prophage regions were identified in its genome. One contained genes for Zona occludens toxin (Zot) and Accessory cholera toxin (Ace), essential toxins of toxigenic strains apart from CTX toxins. Pan-genome analysis of strains, including PH1009, revealed an "open" pan-genome for and a core genome mainly composed of genes necessary for growth and metabolism. Phylogenetic tree based on the core genome alignment revealed that PH1009 was closest to strains QT520, CAIM 1754, and 823tez1. Published virulence factors present on the strain QT520 suggest similar pathogenicity with PH1009. However, PH1009 Zot was not found on related strains but was present in strains HENC-01 and CAIM 148. Most unique genes found in the PH1009 strain were identified as hypothetical proteins. Further annotation showed that several of these hypothetical proteins were phage transposases, integrases, and transcription regulators, implying the role of bacteriophages in the distinct genomic features of the PH1009 genome. The PH1009 genome will serve as a valuable genomic resource for comparative genomic studies and in understanding the disease mechanism of the species.
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Authors De Mesa, Czarina Anne;Mendoza, Remilyn M;Penir, Sarah Mae U;de la Peña, Leobert D;Amar, Edgar C;Saloma, Cynthia P;
Journal Heliyon
Year 2023
DOI
e14926
URL
Keywords
antibiotic resistance heavy metal resistance prophage vibrio harveyi zona occludens toxin

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