2020
DOI: 10.1007/s00284-020-02074-4
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Colistin Resistance and Extensive Genetic Variations in PmrAB and PhoPQ in Klebsiella Pneumoniae Isolates from South Korea

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Cited by 11 publications
(5 citation statements)
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“…Sequence analysis revealed amino acid variations in PmrB, PmrC, PmrE, PmrK, and MgrB compared with the colistin-susceptible K. pneumoniae reference strain, MGH78578 (Table 3). The same amino acid changes that were previously reported as contributing to colistin resistance were observed in PmrB (T246A and R256G) and PmrC (C27F, I138V, and Q319R) from the two isolates (8,30,31). Furthermore, we identified novel amino acid substitutions in PmrE (V17I, A33S, H68Q, T105A, A165E, D172N, A274G, N354D/A, E371D, and T373A) and PmrK (M114L, V117I, R372K, and G462R) from the LTH36 or LTH51 isolates, although more studies are required to prove a connection between the mutations and colistin resistance.…”
Section: Characterization Of the Colistin Resistance In The Ncp-crkp Isolates With Colistin Resistancesupporting
confidence: 82%
“…Sequence analysis revealed amino acid variations in PmrB, PmrC, PmrE, PmrK, and MgrB compared with the colistin-susceptible K. pneumoniae reference strain, MGH78578 (Table 3). The same amino acid changes that were previously reported as contributing to colistin resistance were observed in PmrB (T246A and R256G) and PmrC (C27F, I138V, and Q319R) from the two isolates (8,30,31). Furthermore, we identified novel amino acid substitutions in PmrE (V17I, A33S, H68Q, T105A, A165E, D172N, A274G, N354D/A, E371D, and T373A) and PmrK (M114L, V117I, R372K, and G462R) from the LTH36 or LTH51 isolates, although more studies are required to prove a connection between the mutations and colistin resistance.…”
Section: Characterization Of the Colistin Resistance In The Ncp-crkp Isolates With Colistin Resistancesupporting
confidence: 82%
“…A negative polymerase chain reaction (PCR) molecular test result cannot be used to predict colistin susceptibility because the test cannot rule out the existence of chromosomal mechanisms of resistance or even novel mcr genes not included in the test. As evidence of this limitation, high colistin resistance rates have been reported among K. pneumoniae strains that produce carbapenemase but lack mcr genes (102)(103)(104)(105). In these circumstances, a negative PCR result for mcr genes would have poor predictive value for a colistin-susceptible phenotype.…”
Section: Challenges Of Testing and Detecting Colistin Resistance Determinantsmentioning
confidence: 99%
“… 2019 ; Cheong et al . 2020 ). However, the parallel occurrence of mutations in MgrB, PhoPQ or PmrAB does not clarify the contribution of mutations in PmrD to the colistin resistance phenotype.…”
Section: Resistance Mechanismsmentioning
confidence: 99%