Denaturing DNA for dPCR Sensitivity with Limited Samples
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Solution Overview
Problem
Digital polymerase chain reaction (dPCR) technologies face limitations in sensitivity due to the paucity of starting material, particularly in clinical samples, where the detection limits cannot be improved beyond the input DNA limitations, and sub-sampling errors compromise absolute nucleic acid quantification.
Innovation Solution
The method involves denaturing double-stranded nucleic acid into single strands, partitioning the single strands into compartments, and performing digital amplification, which effectively doubles the amount of input nucleic acid that can be detected, thereby enhancing the sensitivity of the assay while maintaining the same detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If double-stranded nucleic acid is used as input for dPCR, then the assay can be performed with standard protocols, but the sensitivity is limited by the paucity of starting material
Solution Approach 1:
The double-stranded nucleic acid is segmented into single strands through denaturation, effectively doubling the number of independent targets available for detection. Each strand can be independently amplified and detected in separate partitions, thereby improving sensitivity without requiring additional input material.
Solution Approach 2:
The physical state of the nucleic acid is changed from double-stranded to single-stranded through denaturation conditions (heat or chemical treatment). This parameter change enables each strand to function as an independent target, effectively doubling the detectable signal from the same input amount.
2Measurement precision
If pre-amplification methods are used to increase the amount of input nucleic acid, then the sensitivity of detection is improved, but experimental errors and artifacts are introduced
Solution Approach 1:
The nucleic acid is denatured into single strands before the partitioning and amplification steps. This preliminary action effectively doubles the number of targets available for detection while avoiding the need for pre-amplification, thereby maintaining quantification accuracy without introducing amplification artifacts.
3Productivity
If the same amount of DNA is used for multiple assays, then the productivity is limited by the input material availability, but performing separate assays for each target reduces efficiency
Solution Approach 1:
By denaturing the DNA into single strands, the assay effectively doubles the number of independent targets from the same input material. This enables more assays to be performed on limited samples without compromising the statistical power or requiring additional input DNA.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases the number of compartments with detectable targets, improving the accuracy and sensitivity of nucleic acid quantification, allowing for more assays to be performed from limited DNA samples without introducing errors, and reducing the reliance on pre-amplification methods that can introduce experimental issues.
Implementation Method 1
denaturing a double-stranded nucleic acid in a sample to form single-stranded nucleic acid
Data Source
AI summary
Disclosed herein are methods to improve the efficiency of absolute quantification of nucleic acid targets such as digital PCR and digital isothermal amplification, and/or reduce the amount of nucleic acid sample required to determine the absolute quantity of target sequences in the sample.