期刊
ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY
卷 114, 期 9, 页码 1323-1336出版社
SPRINGER
DOI: 10.1007/s10482-021-01592-w
关键词
Aquaculture; Comparative genomics; Emerging pathogens; Mycobacterium; Whole-genome sequencing; Chile
类别
资金
- Centro de Investigaciones Biologicas Aplicadas
- Universidad San Sebastian, Facultad de Medicina Veterinaria, Sede de La Patagonia
The study isolated and characterized Mycobacterium strains from freshwater salmon cultures in Chile, revealing one strain related to human-infecting Mycobacterium franklinii. The isolates carried antimicrobial resistance and virulence genes, indicating their potential as etiological agents of emerging diseases in aquaculture.
Several members of the Mycobacterium genus cause invasive infections in humans and animals. According to a recent phylogenetic analysis, some strains of Mycobacterium salmoniphilum (Msal), which are the main culprit in bacterial outbreaks in freshwater fish aquaculture, have been assigned to a separate branch containing Mycobacterium franklinii (Mfra), another species that causes infections in humans. However, this genus is little studied in an aquaculture context. Here, we isolated four Mycobacterium spp. strains from freshwater cultures of Atlantic and coho salmon in Chile and performed whole-genome sequencing for deep genomic characterization. In addition, we described the gross pathology and histopathology of the outbreaks. Several bioinformatic analyses were performed using the genomes of these four Mycobacterium isolates in conjunction with those of Msal strains, four Msal-like strains, and one Mfra strains, plus 17 other publicly available Mycobacterium genomes. We found that three isolates are clustered into the Msal branch, whereas one isolate clustered with the Mfra/Msal-like strains. We further evaluated the presence of virulence and antimicrobial resistance genes and observed that the four isolates were closely related to the Msal and Msal-like taxa and carried several antimicrobial resistance and virulence genes that are similar to those of other pathogenic members of the Mycobacterium clade. Altogether, our characterization Msal and Msal-like presented here shed new light on the basis of mycobacteriosis provides quantitative evidence that Mycobacterium strains are a potential risk for aquaculture asetiological agents of emerging diseases, and highlight their biological scopes in the aquaculture industry.
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