Colorimetry-Based Phosphate Measurement for Polymerase Elongation.

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• DNA detection is crucial for research and clinical diagnostics, often relying on DNA-dependent DNA polymerase activity.
• Current DNA detection methods heavily depend on instrumental visualization of results.
• Polymerase-catalyzed strand extension is a fundamental process in many DNA detection techniques.

Purpose of the Study:

• To introduce a simple and direct colorimetric method for measuring DNA polymerase-directed strand extension.
• To develop a non-instrumental approach for DNA detection.
• To assess the utility of the colorimetric method in identifying DNA sequence variations and detecting PCR products.

Main Methods:

• Pyrophosphate (PPi), a by-product of DNA strand extension, was converted to phosphate (Pi).
• Phosphate levels were quantified using either Mo-Sb or BIOMOL Green reagent for colorimetric measurement.
• The method was tested for its ability to distinguish single-base DNA variants and detect PCR products under stringent conditions.

Main Results:

• The colorimetric method successfully measured polymerase-directed DNA elongation.
• The assay demonstrated the capability to differentiate single-base sequence variants.
• The method effectively detected polymerase chain reaction (PCR) products under predefined stringent conditions.

Conclusions:

• This colorimetric strategy offers a simple and direct approach to DNA detection.
• The method has potential applications in distinguishing DNA sequence variants.
• The technique shows promise for sensitive detection of DNA and PCR products without complex instrumentation.