Barcoded qPCR Control Composition for Sample Swap Detection
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Solution Overview
Problem
Quantitative polymerase chain reaction (qPCR) lacks effective spike-in controls to detect sample contamination or swapping during DNA extraction and amplification, leading to potential misdiagnosis in clinical applications.
Innovation Solution
Barcoded DNA molecules, optionally encapsulated in simulated cell membranes, are used with primer binding site fragments, allowing detection and differentiation during qPCR to monitor for cross-contamination and sample swapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional qPCR without spike-in controls is used, then the procedure is simple and cost-effective, but sample contamination or swapping cannot be detected
Solution Approach 1:
The control composition is segmented into distinct functional components: barcode sequences for sample identification, primer binding sites for amplification, and probe binding sites for detection. This segmentation allows each component to perform its specific function while maintaining overall system reliability for contamination detection.
Solution Approach 2:
Spike-in control molecules act as intermediaries between the sample and the detection system. These synthetic control sequences are introduced into the sample before processing and serve as mediators to track sample integrity throughout the workflow, enabling detection of contamination or swapping events.
2Reliability
If barcoded DNA molecules with primer binding sites are used, then sample swapping and contamination can be detected, but the complexity of the control composition increases
Solution Approach 1:
Multiple functional elements are merged into a single control composition structure: the barcode sequence, primer binding sites, and probe binding sites are combined in one synthetic DNA molecule. This merging reduces the number of separate components needed while maintaining the ability to detect sample swapping and contamination.
Solution Approach 2:
The control composition is designed with universal primer binding sites that can be amplified using standard qPCR primers, while the unique barcode regions provide sample-specific identification. This multi-functionality allows a single control molecule to serve both as an amplification target and as a sample identifier.
3Measurement precision
If unique probes are designed for each barcode, then detection and differentiation of barcodes is enabled, but the cost and complexity of assay design increase
Solution Approach 1:
The probe design implements local quality by creating highly specific probe-barcode interactions. Each probe is designed to bind only to its complementary barcode sequence with high affinity, while the rest of the control composition uses universal sequences. This localized specificity enables accurate barcode differentiation without requiring complete customization of the entire assay.
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
Ensures accurate qPCR results by detecting and differentiating between samples, controlling for contamination and swapping, and adjusting for GC content and lysis efficiency.
Implementation Method 1
a unique Taqman probe can be designed to correspond with each barcode to enable detection and differentiation of barcodes during qPCR. The probe can bind to the barcode to detect the barcode
Implementation Method 2
the barcode is amplified during a qPCR protocol
Data Source
AI summary
The invention relates to control compositions for a quantitative polymerase chain reaction. More particularly, the invention relates to control compositions for a quantitative polymerase chain reaction having at least one barcode sequence fragment and at least a first and a second primer binding site fragment, and to methods of their use.