Quantitative polymerase chain reaction using a DNA hybridization assay based on surface-activated microplates

Area of Science:

• Molecular Biology
• Biochemistry
• Analytical Chemistry

Background:

• Accurate DNA quantification is essential for molecular biology applications, including quantitative PCR (qPCR).
• Traditional methods can be complex or require specialized equipment.
• A need exists for robust and sensitive DNA quantification techniques adaptable to microplate formats.

Purpose of the Study:

• To develop and validate a microplate-based DNA quantification method.
• To demonstrate the method's utility in quantitative PCR (qPCR) assays.
• To establish the sensitivity and feasibility of the developed assay.

Main Methods:

• Utilized microplates with surface-activated organosilanes for solid-phase DNA capture.
• Employed hybridization between single-stranded target DNA and immobilized capture DNA.
• Detected hybridized DNA via an enzyme-linked assay with labeled target DNA.
• Applied the method to quantitative PCR (qPCR) by coamplifying target plasmid DNA with an internal standard (IS).
• Quantified amplified DNA using differential hybridization with specific capture probes.

Main Results:

• The method demonstrated successful DNA quantification on microplates.
• The assay showed feasibility for quantitative PCR (qPCR) applications.
• Coamplification with an internal standard (IS) allowed for accurate calculation of initial plasmid DNA amounts.
• The quantitative PCR (qPCR) assay detected initial DNA concentration differences as low as approximately 30%.

Conclusions:

• The developed microplate-based hybridization assay offers a reliable method for DNA quantification.
• This technique is suitable for quantitative PCR (qPCR) and can accurately determine initial DNA concentrations.
• The method provides a sensitive and feasible approach for molecular diagnostics and research.