纳米金基因芯片结合通用引物1次PCR法同时检测多个病原菌的研究

目的基于基因分型技术构建通用引物1次PCR法的样品制备技术,并结合纳米金基因芯片检测系统实现1次对多个病原菌的检测分析。方法针对rDNA保守序列设计通用引物,实现1次PCR完成对各靶细菌ISR序列的扩增;设计针对各靶细菌的特异探针,构建纳米金新型基因芯片,并用芯片进行实际检测。结果设计的通用引物可实现对12种待检靶细菌的正确扩增;选用的各探针特异性强、可靠性好;芯片具有较好的灵敏度、特异性及可靠性;检测敏感性达到50 fmol/L;临床检测显示本方法准确可靠。结论与多重PCR样品制备法芯片比较,本芯片检测的步骤和复杂性大为减低,且有较好的检测性能,可用于各靶病原菌的检测。

Detection of Bacterial Pathogens by Nanogold-based Gene Chip Combining with One-time PCR with Common Primers

OBJECTIVE To develop a preparation technique of sample of one-time PCR with common primers based on ribotyping which was combined with the detection system of nanogold-based gene chip to detect clinical bacterial pathogens.METHODS According to the highly conserved regions of rDNA,the common primers were designed and used to amplify each target bacterial ISRs by one-time PCR,and the specific oligonucleotide probes for each target ISRs were designed,utilized to establish the new nanogold-based gene chips.After the characteristics of the chip such as sensitivity,specificity and reliability were determined,the chip was used to detect clinical samples.RESULTS The designed common primers could amplify the 12 target bacteria successfully by one-time PCR.All selected probes were of strong specificity and great reliability.The chip had high sensitivity,specificity and reliability,reaching 50 fmol/L of detection sensibility.Clinical detection results showed the chip had a great accuracy.CONCLUSIONS Compared to multi-PCR chip detection,the detection procedure and complexity of the chip are decreased significantly,and have more practical value in clinical pathogens detection.