Design, validation, and implementation of multiplex digital PCR assays for simultaneous quantification of multiple...

Area of Science:

• Molecular Biology
• Biotechnology
• Analytical Chemistry

Background:

• Quantitative polymerase chain reaction (qPCR) and digital PCR (dPCR) are crucial for molecular target quantification in various fields.
• dPCR offers superior accuracy over qPCR due to its independence from standard curves and resistance to inhibitors.
• Multiplexing dPCR assays allows simultaneous quantification of multiple targets, increasing throughput but presenting unique challenges.

Purpose of the Study:

• To describe a systematic three-phase development process for non-competing multiplex dPCR assays.
• To identify and provide solutions for common challenges in multiplex dPCR assay development.
• To offer recommendations for future design and standardization of multiplexed dPCR assays.

Main Methods:

• Phase 1 involved in silico assay design, including primer/probe selection, interaction analysis, and fluorophore/quencher choice.
• Phase 2 focused on wet-lab validation, benchmarking assays with positive controls, and redesigning as needed.
• Phase 3 entailed validating assay specificity and sensitivity on relevant sample matrices.

Main Results:

• The study outlines a structured approach to developing multiplex dPCR assays.
• Common challenges in multiplex dPCR were identified and addressed with practical solutions.
• The development process ensures robust assay performance for accurate molecular quantification.

Conclusions:

• A three-phase development strategy is effective for creating reliable multiplex dPCR assays.
• Standardization of positive controls and improved in silico prediction tools are needed for future dPCR assay development.
• Automation of partition classification systems can further enhance dPCR assay implementation.