微型寡核苷酸芯片检测脑脊液病原菌研究与应用

目的建立快速检测脑脊液标本中常见病原菌的微型寡核苷酸芯片。方法根据脑脊液中常见病原菌16S rRNA基因序列设计通用引物和检测探针;探针固定于尼龙膜上制成寡核苷酸芯片;通用引物扩增病原菌DNA并标记生物素,产物与芯片进行反向杂交检测;对该体系的敏感性和特异性进行了测试,并检测了32例临床病原菌感染的脑脊液标本。结果所有实验菌株均只与芯片上相应探针杂交。该法最低可检测出10 CFU/ml的大肠埃希菌;32例临床本的检测结果与常规鉴定法完全一致。结论该寡核苷酸芯片法能够准确、敏感、快速地检测脑脊液标本中的病原菌。

OIigo-chips for Detecting Pathogens in Cerebrospinal Fluids:A Preliminary Study

OBJECTIVE To develop a macroarray method to detect pathogens in cerebrospinal fluid.METHODS According to the bacterial 16S rRNA genes,designed 10 kinds of specific probes and a pair of universal primers that can amplify rRNA gene of all bacteria.The tailed probes were spotted onto a nylon membrane.DNA was isolated from each pathogen,and subjected to UP-PCR to amplify target fragments,which were labeled with bio-16-dUTP at the same time.All those denatured fragments were hybridized to the probes on nylon membrane and visualized by AKP labeled avidin.The sensitivity and specificity of the system were detected.A total of 32 CSF samples,which were verified the bacterial infection by the routine method,were tested by this method.RESULTS It was sensitive to 10 CFU/ml when detecting Escherichia coli.Every kind of pathogens only reacted to its corresponding probes fixed on nylon membranes,which showed high specificity.The result of identifying 32 CSF clinical specimens accorded with that of routine method.CONCLUSIONS The method can screen out common pathogens in CSF sensitively and exactly.