Wang G, Rahman M S, Humayun M Z, Taylor D E
Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Canada.
Antimicrob Agents Chemother. 1999 Mar;43(3):683-5. doi: 10.1128/AAC.43.3.683.
Clarithromycin resistance in Helicobacter pylori is due to point mutation within the 23S rRNA. We examined the growth rates of different types of site-directed mutants and demonstrated quantitatively the competitive growth advantage of A-to-G mutants over other types of mutants by a multiplex sequencing assay. The results provide a rational explanation of why A-to-G mutants are predominantly observed among clarithromycin-resistant clinical isolates.
幽门螺杆菌对克拉霉素耐药是由于23S rRNA内的点突变所致。我们检测了不同类型定点突变体的生长速率,并通过多重测序分析定量证明了A-to-G突变体相对于其他类型突变体的竞争生长优势。这些结果为为何在克拉霉素耐药临床分离株中主要观察到A-to-G突变体提供了合理的解释。