Full Dynamic Range Quantification using Loop-mediated Amplification (LAMP) by Combining Analysis of Amplification...

Area of Science:

• Molecular Biology
• Biotechnology
• Nucleic Acid Quantification

Background:

• Quantitative PCR (qPCR) and digital PCR (dPCR) face limitations in accurately quantifying nucleic acid targets at very low or high concentrations, often requiring sample dilution.
• Existing methods struggle with a broad dynamic range, impacting the precision of molecular diagnostic assays.

Purpose of the Study:

• To develop novel quantification metrics for loop-mediated amplification (LAMP) that bridge the gap between high and low template concentrations.
• To establish accurate quantification methods for low copy numbers (1-10 copies) using LAMP, suitable for undiluted samples.

Main Methods:

• Real-time monitoring of LAMP reactions using bioluminescent reporting (BART) and fluorescent dye binding.
• Analysis of reaction timing variations at low copy numbers as a quantification indicator.
• Utilizing artificial templates to confirm the fundamental nature of LAMP initiation variation.

Main Results:

• Increasing variation in LAMP reaction timings at low copy numbers correlates with decreasing template concentration.
• Quantification of targets between 1 and 10 copies was achieved with high accuracy, primarily using timing variance.
• The observed timing variation is an intrinsic feature of the LAMP initiation mechanism, not dependent on displacement primers.

Conclusions:

• Developed LAMP quantification metrics offer a solution for accurate molecular target measurement across a wide dynamic range.
• These methods facilitate precise quantification in closed-tube, undiluted samples, enhancing molecular diagnostic capabilities.
• LAMP-based ultra-quantification strategies hold significant potential for a comprehensive diagnostic approach.