Unveiling Insights into the Whole Genome Sequencing of Mycobacterium spp. Isolated from Siamese Fighting Fish ( Betta splendens )
This study aims to genomically elucidate six isolates of rapidly growing non-tuberculous mycobacteria (RGM) derived from Siamese fighting fish ( ). These isolates had previously undergone phenotypic and biochemical characterization, antibiotic susceptibility testing, and in vivo virulence assessment...
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Veröffentlicht in: | Animals (Basel) 2024-10, Vol.14 (19), p.2833 |
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Hauptverfasser: | , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | This study aims to genomically elucidate six isolates of rapidly growing non-tuberculous mycobacteria (RGM) derived from Siamese fighting fish (
). These isolates had previously undergone phenotypic and biochemical characterization, antibiotic susceptibility testing, and in vivo virulence assessment. Initial DNA barcoding using the 16S rRNA sequence assigned these six isolates to five different species, namely
(BN1983),
(BN1984 and N041),
(SNSK5),
(BN1956), and
(BN1985). However, the identification relied solely on the highest percent identity of the 16S rRNA gene, raising concerns about the taxonomic ambiguity of these species. Comprehensive whole genome sequencing (WGS) and extended genomic comparisons using multilocus sequence typing (MLST), average nucleotide identity (ANI), and digital DNA-DNA hybridization (dDDH) led to the reclassification of BN1985 and SNSK5 as
while confirming BN1983 as
and BN1984 and N041 as
. Notably, the analysis of the BN1956 isolate revealed a potential new species that is proposed here as
subsp.
sp. nov. Common genes encoding "mycobacterial" virulence proteins, such as PE and PPE family proteins, MCE, and YrbE proteins, were detected in all six isolates. Two species, namely
and
, appear to have horizontally acquired T6SS-II (
), catalase (
), GroEL (
), and capsule (
) from distantly related environmental bacteria such as
sp.,
sp.,
sp., and
sp. This study provides the first draft genome sequence of RGM isolates currently circulating in
and underscores the necessity of WGS for the identification and classification of mycobacterial species. |
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ISSN: | 2076-2615 2076-2615 |
DOI: | 10.3390/ani14192833 |