Point-of-care detection of 16S rRNA of Staphylococcus aureus based on multiple biotin-labeled DNA probes

• Published in: Molecular and cellular probes 2019-10, Vol.47, p.101427-101427, Article 101427
• Main Authors: Zheng, Xiaoliang, Wang, Yue, Bu, Shengjun, Chen, Zhibao, Wan, Jiayu
• Format: Article
• Language: English
• Subjects: 16S rRNA; Biosensing Techniques - methods; Biotin - chemistry; DNA probe; DNA Probes - chemistry; DNA, Bacterial - genetics; DNA, Ribosomal - genetics; Food Microbiology; Gold - chemistry; Lateral flow assay; Limit of Detection; Metal Nanoparticles; Molecular Conformation; Point-of-care detection; Point-of-Care Systems; RNA, Ribosomal, 16S - genetics; S. aureus; Smartphone; Staphylococcus aureus - genetics; Staphylococcus aureus - isolation & purification; Wireless Technology
• ISSN: 0890-8508; 1096-1194
• DOI: 10.1016/j.mcp.2019.101427

A visual method that combines multiple biotin-labeled DNA probes and lateral-flow nucleic acid biosensor was developed to detect Staphylococcus aureus. The 16S rRNA from Staphyloccocus aureus (S. aureus), coupled with multiple biotin-labeled DNA probes, was functionalized in a signal structure for lateral-flow point-of-care detection. The secondary structure of the 16S rRNA was unwound by two specific capture probes modified by Fam and multiple bridge probes, which extended additional sequences for use as initiators. By utilizing the initiators, each target 16S rRNA with multiple DNA probes could tether a number of biotin molecules, so that a large number of streptavidin-labeled gold nanoparticles could be introduced in the lateral flow assay. The images of the lateral flow detection results obtained using a smartphone were transmitted to a computer via Wi-Fi or Bluetooth connection for quantitative processing by ImageJ. The limit of detection was 103 cfu/mL without sample enrichment, and decreased to 0.12 cfu/mL following a 3-h enrichment of samples in growth medium. Notably, this method presented high specificity and applicability for the detection of S. aureus in food samples. In short, the developed visual non-specific operation method is very suitable for point-of-care diagnosis of pathogens in resource-limited countries. •A method that combines DNA probes and lateral-flow nucleic acid biosensor was developed to detect Staphylococcus aureus.•This flow nucleic acid biosensor method is very suitable for point-of-care diagnosis of pathogens.•Portable smartphones can be used for quantitative analysis.