A guide to nucleic acid detection by single-molecule kinetic fingerprinting

Area of Science:

• Biochemistry
• Molecular Biology
• Analytical Chemistry

Background:

• Conventional nucleic acid detection relies on Polymerase Chain Reaction (PCR), which requires amplification, purification, and can introduce errors.
• Existing amplification-free methods lack the sensitivity and specificity of PCR.

Purpose of the Study:

• To provide a practical guide to the novel amplification-free method, single-molecule recognition through equilibrium Poisson sampling (SiMREPS).
• To highlight SiMREPS's capability for single-molecule sensitivity and single-base selectivity.

Main Methods:

• SiMREPS monitors repetitive interactions of fluorescent probes with immobilized nucleic acid targets.
• Kinetic fingerprinting is employed to filter out background noise from nonspecific probe binding.

Main Results:

• SiMREPS achieves virtually zero background signal, ensuring high specificity.
• Demonstrated quantification of microRNA miR-16 and detection of the EGFR L858R mutation with high discrimination.

Conclusions:

• SiMREPS offers a sensitive and specific amplification-free approach for nucleic acid detection.
• This digital methodology provides a viable alternative to PCR, overcoming its limitations.