CRISPR-Cas9 Triggered Two-Step Isothermal Amplification Method for E. coli O157:H7 Detection Based on a Metal–Organic Framework Platform
| Autor: | Jing He, Zhixian Gao, Sha Liu, Yu Wang, Yuan Peng, Yonggang Hu, Baoan Ning, Xuan Sun, Man Zhang, Wang Jiang, Lu Zhang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Detection limit
Chemistry 010401 analytical chemistry Multiple displacement amplification Loop-mediated isothermal amplification Virulence Nucleic acid amplification technique 010402 general chemistry medicine.disease_cause 01 natural sciences Fluorescence 0104 chemical sciences Analytical Chemistry Rolling circle replication medicine Biological system Escherichia coli |
| Zdroj: | Analytical Chemistry. 92:3032-3041 |
| ISSN: | 1520-6882 0003-2700 |
| Popis: | Escherichia coli O157:H7 has been reported as an important pathogenic bacteria causing serious infection and economic loss. However, detection of Escherichia coli O157:H7 needs improvement, given its current complexity and sensitivity. Herein, we attempt to build a fluorescence sensing method to detect Escherichia coli O157:H7 with easy operation and high efficiency. The target virulence gene sequences are recognized and cleaved by the CRISPR-Cas9 system, and trigger strand displacement amplification and rolling circle amplification. After amplification reactions, massive products can hybridize with the probes, the fluorescence of which are quenched based on a metal-organic framework platform, leading to the fluorescence recovery at typical excitation/emission wavelengths of 480/518 nm. This method exhibits high sensitivity with the detection limit at 4.0 × 101 CFU mL-1 and a wide range from 1.3 × 102 CFU mL-1 to 6.5 × 104 CFU mL-1. Meanwhile, this assay also shows significant specificity and applies to practical samples with high accuracy. Therefore, our method would have great potential application in bacterial detection, food safety monitoring, or clinical diagnostics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|