摘要
目的 了解临床分离的携带blaKPC-2型碳青霉烯酶基因泛耐药肺炎克雷伯菌中16S rRNA甲基化酶基因和氨基糖苷类修饰酶(AMEs)基因的分布。方法 在2008年11月~2009年7月从笔者医院住院患者中分离19株携带blaKPC-2型碳青霉烯酶基因泛耐药肺炎克雷伯菌,采用PCR及序列分析的方法分析6种16S rRNA甲基化酶基因(armA、rmtA、rmtB、rmtC、rmtD和npmA)和14种AMEs基因[ant(3″)-Ⅰ、ant(2″)-Ⅰ、ant(4′)-Ⅰ a/b、aadA4/5、aadA6/16、aac(3)-Ⅰ、aac (3)-Ⅱ、aac(3)-Ⅲ、aac(3)-Ⅳ、aac(6′)-Ⅰb、aac(6′)-Ⅱ、aph(3′)-Ⅰ、aph(3′)-Ⅱb和aph(3')-Ⅵa].结果 19株中,5种基因aac(3)-Ⅱ、aac(6′)-Ⅰb、aac(6′)-Ⅱ、ant(3″)-Ⅰ和aph(3′)-Ⅰ的阳性株数[阳性率(%)]分别为2(10.5%)、1(5.3%)、19(100.0%)、19(100.0%)和2(10.5%),其余15种基因均阴性;AMEs基因总阳性率为100.0% (19/19).对1株(6号菌株)aac(6′)-Ⅰb基因PCR阳性产物进行测序,证实为aac(6')-Ⅰb-cr双功能酶基因.结论 氨基糖苷类修饰酶基因aac(6′)-Ⅱ和ant(3″)-Ⅰ在携带blaKPc-2型碳青霉烯酶基因泛耐药肺炎克雷伯菌中广泛分布。
Objective To investigate the distribution of 16S rRNA methylase genes and Aminoglycoside modifying enzymes(AMEs) genes in pandrug-resistant Klebsiella pneumoniae harboring blaKpc-2type carbapenemase gene.Methods Nineteen strains of pandrugresistant Klebsiella pneumoniae harboring blaKpc-2type carbapenemase gene were isolated from the inpatients between November,2008 and July,2009.Six kinds of 16S rRNA methylase gene (including armA,rmtA,rmtB,rmtC,rmtD and npmA) and 14 kinds of AMEs gene [including ant(3″)-Ⅰ,ant(2″)-Ⅰ,ant(4')-Ⅰ a/b,aadA4/5,aadA6/16,aac(3)-Ⅰ,aac(3)-Ⅱ,aac(3)-Ⅲ,aac(3)-Ⅳ,aac (6')-Ⅰ b,aac(6′)-Ⅱ,aph(3′)-Ⅰ,aph(3′)-Ⅱ b and aph(3′)-Ⅵa] were analyzed by PCR and verified by DNA sequencing.Results Of the 19 strains tested,the positive rate of genes of aac(3)-Ⅱ,aac(6′)-Ⅰ b,aac(6′)-Ⅱ,ant(3″)-Ⅰ and aph(3′)-Ⅰ were 10.5% (2/19),5.3% (1/19),100.0%,100.0% and 10.5% (2/19),respectively.The 15 kinds of rest genes were all tested negative.To the No.6 strain of Klebsiella pneumoniae that the aac(6′)-Ⅰ b gene was positive,analysed by PC R and verification by DNA sequencing,was confirmed to take the aac(6′)-Ⅰ b-cr.Conclusion AMEs genes aac(6′)-Ⅱ and ant(3″)-Ⅰ are prevalent in pandrug-resistant Klebsiella pneumoniae harboring blaKPc-2type carbapenemase gene isolated from the inpatients.
出处
《医学研究杂志》
2014年第9期77-79,共3页
Journal of Medical Research
基金
杭州市科技局科技计划项目(20110833B48)