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Optimizing the performance of digital loop-mediated isothermal amplification.

Yingying Xue¹, Xinyi Luo¹, Xueyuan Pang¹

¹School of Biomedical Engineering, Sun Yat-sen University, Shenzhen, 518107, China.

Analytical Biochemistry

|September 12, 2021

Summary

We developed a prehybridization-induced enhancement (PIE) strategy to improve digital loop-mediated isothermal amplification (dLAMP) efficiency. This method enhances digital efficiency 2-40 times for accurate nucleic acid detection without extra primers or steps.

Keywords:

Absolute quantification Detection of DNA Digital LAMP Digital efficiency

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Area of Science:

Molecular Biology
Biotechnology
Analytical Chemistry

Background:

Digital loop-mediated isothermal amplification (dLAMP) offers isothermal amplification, absolute quantification, and single-molecule sensitivity for nucleic acid detection.
A key limitation of dLAMP is inaccurate quantification stemming from low digital efficiency, where not all loaded template molecules are amplified.

Purpose of the Study:

To enhance the digital efficiency of dLAMP for more accurate nucleic acid quantification.
To introduce a novel strategy that improves dLAMP performance without additional operational complexity or new primers.

Main Methods:

Development of a prehybridization-induced enhancement (PIE) strategy.
Application of the PIE strategy to the dLAMP process.
Evaluation of the impact of PIE on digital efficiency and quantification accuracy.

Main Results:

The PIE strategy significantly improved digital efficiency by 2-40 times compared to standard dLAMP.
The enhancement was achieved without introducing new primers or requiring additional operational steps.
This suggests a more effective utilization of loaded template molecules during amplification.

Conclusions:

The PIE strategy offers a simple yet effective method to overcome the low digital efficiency limitation in dLAMP.
This advancement provides new insights into dLAMP reaction dynamics and improves its quantification capabilities.
The PIE strategy holds potential for application in other digital amplification techniques.