A highly rifampicin resistant Mycobacterium tuberculosis strain emerging in Southern Brazil
| Autor: | Hermes Luís Neubauer de Amorim, Regina Bones Barcellos, Sun Hee Schiefelbein, Rúbia Raubach Trespach, Elis Regina Dalla Costa, Pedro Eduardo Almeida da Silva, Leonardo Souza Esteves, Ana Júlia Reis, Andrea von Groll, Fernanda Sá Spies, Raquel de Abreu Maschmann, Richard Steiner Salvato, Maria Lucia Rosa Rossetti |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Microbiology (medical) DNA Bacterial Tuberculosis 030106 microbiology Immunology DNA Mutational Analysis Antitubercular Agents Biology Microbiology Mycobacterium tuberculosis 03 medical and health sciences chemistry.chemical_compound Minimum inhibitory concentration Bacterial Proteins RNA polymerase Tuberculosis Multidrug-Resistant medicine Humans Gene Retrospective Studies Whole genome sequencing Strain (chemistry) rpoB medicine.disease biology.organism_classification Virology 030104 developmental biology Infectious Diseases chemistry Mutation Rifampin Brazil Rifampicin medicine.drug |
| DOI: | 10.1101/2020.09.03.282194 |
| Popis: | Here we described phenotypical, molecular and epidemiological features of a highly rifampicin-resistant Mycobacterium tuberculosis strain emerging in Southern Brazil, that carries an uncommon insertion of 12 nucleotides at the codon 435 in the rpoB gene. Employing a whole-genome sequencing-based study on drug-resistant Mycobacterium tuberculosis strains, we identified this emergent strain in 16 (9.19%) from 174 rifampicin-resistant clinical strains included. Nine of these 16 strains were available to minimum inhibitory concentration determination and for all of them was found a high rifampicin-resistance level (≥ to 32 mg/L). This high resistance level could be explained by structural changes into the RIF binding site of RNA polymerase caused by the insertions, and consequent low-affinity interaction with rifampicin complex confirmed through protein modeling and molecular docking simulations. Epidemiological investigation showed that most of the individuals (56.25%) infected by the studied strains were prison inmate individuals or that spent some time in prison. The phylogenomic approach revealed that all strains carrying on the 12 nucleotide insertion belonged to the same genomic cluster, evidencing a communal transmission chain involving inmate individuals and community. We stress the importance of tuberculosis genomic surveillance and the introduction of measures to interrupt the Mycobacterium tuberculosis transmission chain in this region. |
| Databáze: | OpenAIRE |
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