Optimization of turn-back primers in isothermal amplification

Area of Science:

• Molecular Biology
• Bioinformatics
• Biotechnology

Background:

• Isothermal amplification technologies are increasingly used in diagnostics and therapeutics.
• Existing primer design tools struggle with complex amplification processes, necessitating improved methods.
• Turn-back primers (TPs) are crucial for loop-mediated amplification (LAMP) and Smart Amplification Process (SmartAmp).

Purpose of the Study:

• To develop an optimized primer selection system for turn-back primers (TPs) in isothermal amplification.
• To enhance the speed and reliability of isothermal amplification processes.
• To address limitations of current primer design tools for complex amplification reactions.

Main Methods:

• Collected experimental data for 1344 primer combinations, analyzing 78 parameters.
• Employed the least absolute shrinkage and selection operator (LASSO) method for parameter selection and coefficient estimation.
• Validated the prediction model through independent experiments and comparison with Primer Explorer version 4 (PE4).

Main Results:

• The developed primer selection system demonstrated superior primer design for isothermal amplification.
• The model proved robust against variations in experimental conditions.
• LASSO regression identified the availability of the 3'- and 5'-ends of the primer as critical for efficient amplification.

Conclusions:

• The novel primer selection system offers improved performance over existing tools like PE4.
• The system enhances the efficiency and reliability of isothermal amplification, particularly for TP-based methods.
• The study provides a valuable computational tool for optimizing TP design in molecular diagnostics and research.