Gene Sequencing and Phylogenetic Analysis: Powerful Tools for an Improved Diagnosis of Fish Mycobacteriosis Caused by Mycobacterium fortuitum Group Members.
Davide MugettiMattia TomasoniPaolo PastorinoGiuseppe EspositoVasco MenconiAlessandro DondoMarino PrearoPublished in: Microorganisms (2021)
The Mycobacterium fortuitum group (MFG) consists of about 15 species of fast-growing nontuberculous mycobacteria (NTM). These globally distributed microorganisms can cause diseases in humans and animals, especially fish. The increase in the number of species belonging to MFG and the diagnostic techniques panel do not allow to clarify their real clinical significance. In this study, biomolecular techniques were adopted for species determination of 130 isolates derived from fish initially identified through biochemical tests as NTM belonging to MFG. Specifically, gene sequencing and phylogenetic analysis were used based on a fragment of the gene encoding the 65 KDa heat shock protein (hsp65). The analyzes made it possible to confirm that all the isolates belong to MFG, allowing to identify the strains at species level. Phylogenetic analysis substantially confirmed what was obtained by gene sequencing, except for six strains; this is probably due to the sequences present in NCBI database. Although the methodology used cannot represent a univocal identification system, this study has allowed us to evaluate its effectiveness as regards the species of MFG. Future studies will be necessary to apply these methods with other gene fragments and to clarify the real pathogenic significance of the individual species of this group of microorganisms.
Keyphrases
- heat shock protein
- genetic diversity
- copy number
- genome wide
- genome wide identification
- escherichia coli
- single cell
- mycobacterium tuberculosis
- randomized controlled trial
- heat shock
- emergency department
- gene expression
- high resolution
- transcription factor
- genome wide analysis
- liquid chromatography
- electronic health record
- case control