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High-specificity double-stranded DNA detection with a "humanoid" molecular beacon and TALEs
Yu Wang1, Jialei Bai, Xiaochen Qu
1Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Institute of Environmental and Operational Medicine, Academy of Military Medical Science, Academy of Military Science, Tianjin 300050, P.R. China. gaozhx@163.com ningba@163.com.
Nanoscale
|September 27, 2018
Summary
This study introduces a novel fluorescence detection method for bacteria using transcription activator-like effectors (TALEs) and isothermal amplification. The technique achieves high sensitivity and specificity for detecting pathogens like Escherichia coli O157:H7.
Area of Science:
- Biotechnology
- Molecular Biology
- Biosensing
Background:
- Improving bacterial detection sensitivity without culture is challenging due to DNA recognition limitations.
- Transcription activator-like effectors (TALEs) offer specific DNA recognition capabilities.
- Existing methods often lack the required sensitivity and specificity for rapid pathogen detection.
Purpose of the Study:
- To develop a sensitive and specific fluorescence detection method for bacteria.
- To utilize TALEs for DNA recognition and isothermal amplification for enhanced sensitivity.
- To enable rapid detection of foodborne pathogens and viruses.
Main Methods:
- Developed a fluorescence detection method employing TALEs for specific double-stranded DNA recognition.
- Integrated RPA (recombinase polymerase amplification) for isothermal amplification to boost sensitivity.
- Designed a "humanoid" molecular beacon (H-MB) for signal output, utilizing protein steric hindrance to enhance fluorescence.
Main Results:
- Achieved single-base mismatch specificity for detecting Escherichia coli O157:H7.
- Demonstrated high sensitivity with a detection limit of 3 colony-forming units per milliliter (cfu mL-1).
- Validated applicability in real samples after a simple 10-minute boiling pretreatment.
Conclusions:
- The TALE-based fluorescence method offers a sensitive, specific, and rapid approach for bacterial detection.
- The method's adaptability allows for the detection of various foodborne pathogens and viruses.
- This biosensing platform holds promise for food safety and clinical diagnostics.