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Updated: Dec 21, 2025
Identification of Virulence Markers of Mycobacterium abscessus for Intracellular Replication in Phagocytes
Published on: September 27, 2018
Novel mutations in the resistome of a new sequence type (ST262) of clarithromycin resistant Mycobacterium abscessus
Maiara Dos Santos Carneiro1, Daiana de Lima-Morales2, Marina Niada Crispim2
1Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratório de Pesquisa em Resistência Bacteriana (LABRESIS), Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil.
Objectives:
The aim of this study was to evaluate the relationship between antimicrobial susceptibility and genotype of a Mycobacterium abscessus subsp. massiliense isolate obtained from the respiratory tract of a patient in southern Brazil.
Methods:
The isolate (named Myco1POA) was submitted to whole-genome sequencing using an Illumina MiSeq platform. Data were analysed using Trim Galore!, SPAdes Genome Assembler, Geneious and BioEdit software. Multilocus sequence typing (MLST) was performed by in silico analysis of seven housekeeping genes according to the Institut Pasteur database. The antimicrobial susceptibility profile was determined by broth microdilution according to Clinical and Laboratory Standards Institute (CLSI) guidelines.
Results:
Several mutations in genes related to antimicrobial resistance were identified in Myco1POA. MLST indicated that the isolate belonged to a novel sequence type (ST), which was designated ST262. Phenotypic susceptibility and genotypic findings were concordant, except for clarithromycin [erm(41) and rrl genes].
Conclusion:
Here we describe the genome sequence of M. abscessus subsp. massiliense Myco1POA identified as a novel sequence type (ST262) and indicate possible new gene mutations leading to clarithromycin resistance.
