Robust Sequence Design Space for the Isothermal Exponential Amplification of Short Oligonucleotides

Area of Science:

• Biotechnology
• Molecular Biology
• Biosensing

Background:

• Isothermal amplification techniques are crucial for biosensing and molecular devices.
• Exponential amplification reaction (EXPAR) is suitable for short oligonucleotides in molecular computing and microRNA detection.
• Nonspecific background amplification has limited EXPAR's widespread use.

Purpose of the Study:

• To improve the performance of EXPAR by addressing nonspecific background amplification.
• To establish a universal adapter design framework for enhanced EXPAR.
• To enable multiplexed detection of multiple targets in a single reaction.

Main Methods:

• Developed a new EXPAR system configuration operating at 37 °C.
• Identified critical sequence motifs for signal-to-background optimization.
• Generated orthogonal template sequences using a universal adapter design framework.
• Implemented a triplex reaction for simultaneous detection of multiple targets.

Main Results:

• Achieved significantly improved performance with a low signal-to-background ratio.
• Demonstrated the effectiveness of the universal adapter design framework.
• Successfully evaluated mixtures of multiple-target inputs in a single-step, one-pot format.
• Showcased EXPAR's potential for complex molecular detection without exogenous agents.

Conclusions:

• The developed universal adapter design framework enhances EXPAR performance by minimizing background noise.
• This optimized EXPAR system enables sensitive and specific multiplexed detection of oligonucleotide targets.
• The findings pave the way for advanced biosensing applications and molecular computing.