摘要
目的 建立基于CycleavePCR技术的肺炎支原体及其大环内酯类耐药突变株快速检测方法.方法 收集102株分离自2005-2008年上海市交通大学附属儿童医院住院患儿的肺炎支原体及136份2009年11-12月上海市交通大学附属儿童医院呼吸道感染的住院患儿经鼻采集鼻咽部痰标本,根据肺炎支原体无突变敏感株与突变耐药株23S rRNA基因2063/2064位的碱基差异及上下游保守序列分别设计新型特异性探针（Cycling探针）及引物,建立肺炎支原体及其大环内酯类耐药突变株检测方法,以含有被检测靶序列的重组质粒为阳性对照,以常见呼吸道病原菌DNA为阴性对照,评价其敏感度及特异度.采用自建方法检测所有标本,并与常规PCR及测序结果比较.结果 该方法可准确检出并鉴别大环内酯类敏感及耐药突变株阳性对照,102株临床分离株中83株对大环内酯类耐药,测序表明82株发生23S rRNA基因A2063G突变,1株A2064G突变,与CycleavePCR检测结果相符,136份痰标本检测结果也与常规PCR扩增及测序结果相符.所有阴性对照样品均未出现假阳性.与常规PCR及测序方法相比,CycleavePCR法的敏感度和特异度均达100%.该方法的检测下限为10拷贝/PCR反应,扩增检测可在1.5 h内完成.结论 建立了一种基于CycleavePCR技术的肺炎支原体及其大环内酯类耐药突变株快速检测方法,可同步提供病原菌及其耐药性信息,为肺炎支原体感染诊断及临床合理选用抗菌药物提供参考.
Objective To develop a method for rapid detection of Mycoplasma pneumoniae and its macrolide resistance mutation. Methods The primers and cycling probe sets were designed to detect two single nucleotide mutation, A2063G and A2064G, in the 23s rRNA gene of Mycoplasma pneumoniae. By using recombinant plasmids containing 23s rRNA gene fragments, 102 Mycoplasma pneumoniae clinical isolates from 2005 to 2008, and 136 nasopharyngeal suction specimens from pediatric patients with low respiratory tract infections in Shanghai Children＇s Hospital from November to December in 2009 were investigated to determine the specificity and the sensitivity of the CycleavePCR method. PCR amplification and sequence analysis of 23S rRNA genes were performed for all Mycoplasma pneumoniae strains and Mycoplasma pneumoniae positive specimens to confirm the results of the CycleavePCR method. Results Of 102 clinical isolates, 83 was resistant to erythromycin and sequence results show that all macrolide-resistant Mycoplasma pneumoniae strains harbored an A2063G （ 82/83 ） or A2064G （ 1/83 ） transition mutation in 23S rRNA genes. Twelve was Mycoplasma pneumoniae detected positive by CycleavePCR in 136nasopharyngeal suction specimens. The CycleavePCR results were consistent with those of routine PCR and sequencing. There was no signal production from other bacterial species. Sensitivity and specificity were 100%. The detection limit of the CycleavePCR was 10 plasmid copies per reaction. Experiment can be done within 1.5 h. Conclusion A novel method is developed to detect erythromycin-resistant strains harboring A2063G and A2064G transition mutation in the 23s rRNA gene using CycleavePCR.
出处
《中华检验医学杂志》
CAS
CSCD
北大核心
2010年第9期840-844,共5页
Chinese Journal of Laboratory Medicine
基金
基金项目：国家重点基础研究发展规划项目“973”计划（2005CB523101）
上海市科委医学引导类科技项目（09411967900）
关键词
支原体
肺炎
大环内酯类
抗药性
细菌
突变
聚合酶链反应
Mycoplasma pneumoniae Macrolides Drug resistance, bacterial Mutation Polymerase chain reaction
