ddPCR RVLP Detection for Reliable Biologic Batch Release
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Solution Overview
Problem
Current methods for detecting and quantifying RetroViral Like Particles (RVLPs) in biologic materials used for medicaments, such as the TEM method, suffer from variability, low sensitivity, and high variability in results, making them unreliable for ensuring safety and regulatory compliance.
Innovation Solution
A droplet digital PCR (ddPCR) method is employed to detect and quantify RVLPs by amplifying RNA from intact particles, using two different reaction mixes to differentiate between RNA and DNA, providing absolute quantification and improved sensitivity and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the TEM method is used for RVLP detection, then the detection capability is provided, but the results show marked variability and low reliability
Solution Approach 1:
The patent replaces the mechanical TEM method with a molecular biology-based ddPCR system. Instead of using electron microscopy and manual counting of virus particles, the invention uses reverse transcription and PCR amplification to detect and quantify RVLP RNA, substituting mechanical/visual detection with biochemical amplification and fluorescent detection, thereby achieving higher reliability and precision
Solution Approach 2:
The patent changes the detection parameter from visual particle counting (TEM) to quantitative RNA measurement (ddPCR). By measuring RNA content through amplification and fluorescent signal intensity, the method transforms the detection parameter to achieve superior precision and reliability in RVLP quantification
2Measurement precision
If the TEM method is used for RVLP detection, then virus particles can be visualized, but the detection sensitivity is insufficient
Solution Approach 1:
The patent performs preliminary RNA extraction and reverse transcription before PCR amplification. By concentrating and preparing the RNA target in advance, the method enhances detection sensitivity while the standardized preliminary steps ensure reproducible results across different samples and experiments
Solution Approach 2:
The ddPCR method provides continuous amplification of the target RNA through multiple PCR cycles, allowing detection of even trace amounts of RVLP RNA. The continuous amplification process maintains sensitivity while the standardized protocol ensures reproducibility
3Productivity
If the TEM method is used for RVLP detection, then the reference standard is maintained, but the analysis time and complexity are excessive
Solution Approach 1:
The patent segments the detection process into distinct modular steps: RNA extraction, reverse transcription, PCR amplification with fluorescent probes, and fluorescent detection. This segmentation allows each step to be optimized independently and automated, reducing overall complexity while maintaining speed
Solution Approach 2:
The patent introduces fluorescent probes as intermediaries that bind to amplified RVLP RNA sequences. These probes serve as mediators between the target RNA and the detection system, enabling automated fluorescent detection and simplifying the overall process compared to manual TEM analysis
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
The ddPCR method offers enhanced accuracy, reduced variability, faster results, and a lower detection limit, enabling more reliable detection and quantification of RVLPs, thus improving safety and regulatory compliance.
Implementation Method 1
The absolute quantification of the nucleic acid molecules is possible thanks to a system distributing the sample into small droplets of water-oil emulsion one nanoliter in size
Implementation Method 2
Following the PCR reaction, the droplets are analyzed individually by measuring the fluorescence signal emitted by the probe
Implementation Method 3
Following the PCR reaction, the droplets are analyzed individually by measuring the fluorescence signal emitted by the probe
Implementation Method 4
The sample is treated with DNase and RNase to eliminate most of the genomic DNA and RNA of circulating RVLP
Data Source
AI summary
Provided herein is a method for determining RetroViral Like Particles (RVLPs) using ddPCR (digital droplet PCR). The method enables screening of samples from a manufacturing process for biologic materials to be used as medicaments. As such the method can be used in batch release processes.