Tigecycline resistance may be associated with dysregulated response to stress in Mycobacterium abscessus


Hien, Fuh Ng and Yun, Fong Ngeow and Sook, Fan Yap and Thaw, Zin and Joon, Liang Tan (2020) Tigecycline resistance may be associated with dysregulated response to stress in Mycobacterium abscessus. International Journal of Medical Microbiology, 310 (1). p. 151380. ISSN 1438-4221

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Previously, we characterized 7C, a laboratory-derived tigecycline-resistant mutant of Mycobacterium abscessus ATCC 19977, and found that the resistance was conferred by a mutation in MAB_3542c, which encodes an RshAlike protein. In M. tuberculosis, RshA is an anti-sigma factor that negatively regulates the SigH-dependent heat/ oxidative stress response. We hypothesized that this mutation in 7C might dysregulate the stress response which has been generally linked to antibiotic resistance. In this study, we tested this hypothesis by subjecting 7C to transcriptomic dissection using RNA sequencing. We found an over-expression of genes encoding the SigH ortholog, chaperones and oxidoreductases. In line with these findings, 7C demonstrated better survival against heat shock when compared to the wild-type ATCC 19977. Another interesting observation from the RNA-Seq analysis was the down-regulation of ribosomal protein-encoding genes. This highlights the possibility of ribosomal conformation changes which could negatively affect the binding of tigecycline to its target, leading to phenotypic resistance. We also demonstrated that transient resistance to tigecycline could be induced in the ATCC 19977 by elevated temperature. Taken together, these findings suggest that dysregulated stress response may be associated with tigecycline resistance in M. abscessus.

Item Type: Article
Uncontrolled Keywords: MAB_3542c, Sigma factor, Anti-sigma factor, Stress response, Tigecycline resistance, Mycobacterium abscessus
Subjects: Q Science > QR Microbiology
Divisions: Faculty of Information Science and Technology (FIST)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 29 Oct 2021 03:05
Last Modified: 29 Oct 2021 03:05
URII: http://shdl.mmu.edu.my/id/eprint/8893


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