Three-way junction structure-mediated reverse transcription-free exponential amplification reaction for pathogen RNA...

Area of Science:

• Molecular Biology
• Biotechnology
• Infectious Disease Diagnostics

Background:

• RNA is a critical biomarker for infectious pathogens, essential for accurate disease diagnosis and ensuring safety in environmental and food sectors.
• Current RNA detection methods, while widely used, can be time-consuming and may lack the sensitivity required for early-stage pathogen identification.

Purpose of the Study:

• To develop a novel, rapid, and highly sensitive method for pathogen RNA detection.
• To overcome the limitations of existing RNA detection techniques, such as reverse transcription time and specificity issues.

Main Methods:

• A three-way junction structure-mediated reverse transcription-free exponential amplification reaction (3WJ-RTF-EXPAR) was developed.
• The method utilizes target RNA as a switch to initiate a three-way junction structure, triggering exponential amplification (EXPAR) and subsequent fluorescence signal generation.
• Vent DNA polymerase with proofreading activity and a specific primer structure were employed to enhance specificity and reduce non-specific amplification.

Main Results:

• The 3WJ-RTF-EXPAR method achieved a detection limit of 1.0×10^4 copies/mL for target RNA.
• The entire detection process was completed in just 20 minutes, significantly faster than conventional methods.
• The method demonstrated excellent specificity, effectively differentiating target pathogens from those with similar symptoms.

Conclusions:

• The novel 3WJ-RTF-EXPAR method provides a rapid, sensitive, and specific approach for pathogen RNA detection.
• This technique shows significant potential for clinical diagnostics, offering advantages over current gold-standard methods like qRT-LAMP and qRT-PCR.
• The developed method holds promise for improving disease diagnosis and ensuring public health and safety.