Visual detection of isothermal nucleic acid amplification using pH-sensitive dyes

Area of Science:

• Molecular Biology
• Biotechnology
• Diagnostic Assays

Background:

• Nucleic acid amplification is crucial for molecular diagnostics but often requires complex detection methods.
• Current detection techniques can be time-consuming, equipment-intensive, or both.

Purpose of the Study:

• To develop a novel, rapid, and visually detectable method for nucleic acid amplification.
• To enable molecular diagnostics without specialized or costly instrumentation.

Main Methods:

• Harnessing pH changes in amplification reactions with minimal buffering capacity.
• Utilizing pH-sensitive dyes for visual detection in loop-mediated isothermal amplification (LAMP).
• Demonstrating applicability to strand-displacement amplification, PCR, and RT-LAMP.

Main Results:

• Achieved rapid (<30 min) and sensitive (<10 copies) visual detection using pH-sensitive dyes in LAMP.
• Enabled real-time detection for high-throughput and quantitative applications.
• Showcased broad applicability across different amplification techniques.

Conclusions:

• Colorimetric detection of nucleic acid amplification is a generally applicable approach.
• This method allows immediate analysis of molecular diagnostic tests.
• Eliminates the need for specialized and expensive instrumentation in molecular diagnostics.