炭疽芽孢杆菌特异性基因序列双重TaqMan聚合酶链反应快速检测体系的建立

目的 以炭疽芽孢杆菌的主基因和致病毒素基因pagA特异性序列为检测标志，建立高敏感、高特异的荧光双重实时TaqMan聚合酶链反应快速检测体系。方法 根据炭疽杆菌主基因组特异性序列（Gs）和特异的毒力岛pagA基因序列（Pag）设计引物及探针，通过构建目的质粒获得标准模板，利用TaqMan标记探针和便携式Smartcycle实时聚合酶链反应检测平台探讨该检测体系的检测敏感性和特异性。结果该体系炭疽芽孢杆菌的检测敏感度为10^2拷贝每反应体系，与其他蜡样杆菌群细菌未出现非特异性扩增，具有较高的特异性。整个反应在1h内完成，适合于实验室或野外环境下炭疽芽孢杆菌的快速检测。结论 本研究建立的双重TaqMan实时聚合酶链反应检测体系可作为炭疽芽孢杆菌快速、准确、特异、敏感的检测手段。

Development of duplex TaqMan PCR assay for detection of specific gene sequence from Bacillus anthracis

Objective To establish a rapid assay with high sensitivity and specificity based on the sequences for group specific gene (GS) and pathogenicity island pag A gene.Methods The PCR primers and probes were designed after the whole sequence was systemically analyzed with bio-informafion tools and blasted with Genebank database.The amplicons were inserted into plasmids so that they could be used as the standard templates to evaluate the sensitivity of the diagnostic system.This assay was based on TaqMan probes and portable Smartcycle PCR machine.Results The detection level was approximately 100 copies per reaction.There was no cross-reaction with other species of Bacillus.This assay could be completed in one hour in laboratory.Conclusion The duplex TaqMan PCR assay could be used to detect Bacillus anthracis rapidly with high sensitivity and specificity.