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Correlation between Fluoroquinolone Resistance and Mutations of Neisseria gonorrhoeae gyrA and parC genes
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF DERMATOLOGY
- Issue:
- 3
- DOI:
- 10.3760/j.issn:0412-4030.2002.03.009
- Key Word:
- 奈瑟氏球菌,淋病;微生物敏感性试验;抗感染药,氟喹诺酮;点突变
Abstract： 目的探讨淋球菌gyrA和parC基因突变与淋球菌耐氟喹诺酮类药物之间的关系.方法①纸片扩散法检测58株淋球菌对5种氟喹诺酮类药物的敏感性.②E测定法定量检测环丙沙星的最小抑菌浓度(MIC).③PCR技术扩增gyrA和parC基因的喹诺酮耐药决定区(QRDR)相关序列并作测序分析.结果①对环丙沙星、氧氟沙星、氟罗沙星、洛美沙星、依诺沙星同为敏感、中介、耐药者分别为2株、4株和39株.②环丙沙星MIC为敏感、中介、耐药分别为2株、17株和39株.③环丙沙星MIC为0.004～0.016μg/mL的2株淋球菌gyrA和parC基因均未发生突变;MIC为0.064～0.094μg/mL的菌株仅发生gyrA单位点突变;而MIC≥0.25μg/mL的菌株均发生gyrA双位点突变.MIC≤0.25μg/mL的菌株无parC基因突变,而MIC≥1.0μg/mL的菌株除出现gyrA双位点突变外均同时发生parC单位点突变.④在发生突变的16株菌中,Ser91(TCC)→Phe(TTC)突变为15株.结论①gyrA基因突变介导淋球菌对氟喹诺酮类药物低和中水平耐药,而对氟喹诺酮类药物高水平耐药需要parC基因突变的共同参与.②gyrA基因Ser91→Phe的突变是导致淋球菌对氟喹诺酮类药物耐药的关键突变.
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