一种基于新型再测序芯片的不明原因呼吸道感染样品检测方法的建立

The Establishment of a New Resequencing Pathogen Microarray-based Assay for Detecting Unexplained Respiratory Tract Infections

再测序芯片(Resequencing Pathogen Microarray,RPM)是一种新的基于微阵列DNA芯片的病原体检测与鉴定技术。为了将RPM应用于不明原因呼吸道感染的检测,提高应对传染病暴发的能力,本研究建立了基于一种新型RPM的呼吸道多病原检测方法。该方法可以同时检测19种常见呼吸道病毒、9种甲型流感(Flu A)和11种鼻病毒(HRV)、28种肠病毒、18种少见呼吸道病毒。选取已验证的16种常见呼吸道病毒感染阳性的样本评价RPM的特异性,用克隆质粒或体外转录的RNA梯度稀释液来检验RPM的灵敏度,在10～103拷贝/反应水平时RPM仍能检测和分辨出相近的病毒亚型。将8份不明原因的咽拭子样品提取的核酸合并,用新建立的方法进行检测,根据RPM结果再以普通PCR加测序作为验证,同时和Abbott公司的质谱测序(PLEX-ID)结果进行比较,除RPM检出假阳性PIV1外,三者的其余检测结果一致。结果表明,这种基于新型RPM的方法具有高灵敏度、高通量的优点,对应对新发和突发传染病具有重要意义。

Resequencing Pathogen Microarray （RPM） is a new pathogen detection and identification tech- nology based on DNA microarray. In order to apply RPM in the detection of unexplained infection and as a result, to improve the emergency response capacity, a new RPM-based respiratory pathogens detection assay was developed to simultaneously detect 19 common respiratory viruses, 9 influenza A viruses （Flu A）, ll human rhinoviruses（HRV）, 28 enteroviruses and 18 rare respiratory viruses. The specificity of multiplex system was examined by confirmed positive specimens for 16 common respiratory virus. The sensitivity was evaluated by serial ten-fold dilutions of plasmids or in vitro-transcribed RNA. RPM could detect and differentiate 16 virus types/subtypes at 10 - 1 000 copies/reaction level. Nucleic acids of 8 throat swabs with unexplained respiratory tract infections were pooled and detected by the new assay. The RPM result was verified by common PCR followed by sequencing as well as PLEX-ID （Abbott）. Except Ior a false-positive of PIV1, no difference among the three assays was found. These results indicate the assay based on the new RPM is a highly sensitive, high throughput test for the detection of respiratory virus infections, which is significant for the management of emergent and epidemic infectious disease.