AI Article Synopsis
- The study investigates how Ureaplasma urealyticum develops resistance to Macrolide antibiotics, focusing on mutations in the 23S rRNA.
- Eighteen clinical strains with various resistance levels were analyzed, revealing specific mutations linked to resistance in some strains while others showed changes without acquired resistance.
- The C2243N mutation is suggested as a key factor in resistance to Roxithromycin and Azithromycin, but more research is needed to confirm these findings.
Article Abstract
Objective: To study the mechanisms of acquired resistance of Ureaplasma urealyticum (Uu) to Macrolide antibiotics.
Methods: Eighteen strains of Uu clinical isolates with different phenotypes of resistance to Macrolide antibiotics were screened for mutations in 23S rRNA in comparison with the reference strain ATCC 27618 and AF272627-1 in GenBank, which is susceptible to Macrolide antibiotics.
Results: Compared to the sequence of reference strains ATCC 27618 and AF272627-1, three transitions were found in 23S rRNA of Uu clinical isolates with acquired resistance to Macrolide antibiotics. The C2243N (T or C) transition was found in the 23S rRNA sequence of five strains with the phenotype of acquired resistance to Roxithromycin (ROM) and Azithromycin (AZM). The two changes of A2149C and A2181T were found in the 23S rRNA sequence of nine strains with the phenotype of resistance to ROM and midrange resistance to AZM, and they were also found in that of four strains with the phenotype of sensitivity to macrolides (Josamycin, Clarithromycin, ROM, and AZM). No mutation was found in the ATCC 27618.
Conclusion: The mechanisms of Uu resistance to ROM and AZM may be associated with the C2243N (T or C) mutation in 23S rRNA. Further studies are necessary to confirm this hypothesis.
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| http://dx.doi.org/10.1089/mdr.2008.0817 | DOI Listing |
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