Primer-Flanked DNA Controls for qPCR Contamination Tracking
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Solution Overview
Problem
Quantitative polymerase chain reaction (qPCR) lacks effective spike-in controls to detect sample contamination and swapping during sample processing, which can lead to incorrect diagnoses in clinical applications.
Innovation Solution
The use of barcoded DNA molecules, optionally encapsulated in simulated cell membranes, flanked by primer binding sites, to be amplified during qPCR, allowing detection of cross-contamination and sample swapping through unique barcode signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional qPCR methods are used without spike-in controls, then the analysis is simpler and faster, but sample cross-contamination and swapping cannot be detected
Solution Approach 1:
The control composition is segmented into multiple functional components: barcode sequences for sample identification, primer binding sites for amplification, and optional encapsulation structures. This segmentation allows each component to perform its specific function while maintaining overall system reliability for detecting sample contamination and swapping.
Solution Approach 2:
Barcoded spike-in control nucleic acids serve as intermediary elements between the sample and the qPCR detection system. These controls act as mediators that can be tracked through all processing steps, enabling detection of cross-contamination and swapping without interfering with the actual sample analysis.
2Reliability
If barcoded spike-in controls are added to monitor sample integrity, then sample cross-contamination and swapping can be detected, but the qPCR process becomes more complex
Solution Approach 1:
The barcoded spike-in controls serve multiple functions simultaneously: they act as internal controls for sample tracking, provide GC content variation for efficiency control, and can be encapsulated in different structures to control for lysis efficiency. This multi-functionality reduces the need for separate control systems.
Solution Approach 2:
The control composition utilizes parameter changes in barcode sequences and GC content to differentiate between samples and control for various qPCR conditions. By varying these parameters, the system can monitor multiple aspects of sample integrity using a unified control approach.
3Measurement precision
If multiple control compositions with different GC contents are used, then GC content bias can be controlled, but the manufacturing and handling becomes more difficult
Solution Approach 1:
The patent applies parameter changes by creating control compositions with systematically varied GC content (e.g., 40%, 50%, 60% GC). This standardized parameter variation allows for control of GC content bias while maintaining ease of manufacture through systematic design of the nucleic acid sequences.
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
Enables effective monitoring of sample cross-contamination and swapping throughout the qPCR process, ensuring accurate results by differentiating between samples and controlling for GC content and lysis efficiency.
Implementation Method 1
The quantitative polymerase chain reaction (qPCR), which is also referred to as q-RT-PCR (i.e., quantitative real-time polymerase chain reaction)
Data Source
Figure 1
Figure 2A~2B
Figure 2C
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.