Self-Contained Nucleic Acid Processing with Bead Milling
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Solution Overview
Problem
Traditional methods for diagnosing infectious diseases using PCR are hindered by the need to run multiple assays for various pathogens, which can be impractical due to low pathogen concentrations and sample limitations, and face challenges in robustness and analysis of multiplex reactions, particularly in samples with tough materials like spores or paraffin-preserved samples.
Innovation Solution
A self-contained, flexible sample container with integrated reagent zones and a bead milling system for nucleic acid extraction and amplification, utilizing magnetic beads for recovery and a moving magnet system for isolation and washing, along with thermal cycling and fluorescence detection within a closed system to enhance efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If harsh extraction and lysing conditions are used to release nucleic acids from tough materials like spores and paraffin-preserved samples, then nucleic acid extraction efficiency is improved, but other nucleic acids in contaminants may be degraded
Solution Approach 1:
The patent employs a multi-step extraction protocol that changes parameters sequentially: initial harsh lysis conditions to break tough materials, followed by neutralization and gentle extraction steps to preserve intact nucleic acids. This parameter progression allows selective extraction from different sample types without universal degradation.
Solution Approach 2:
The patent performs preliminary lysis of tough materials (spores, paraffin) before the main nucleic acid extraction step. This preliminary action breaks down resistant structures first, allowing subsequent gentle extraction to recover nucleic acids from both tough and soft materials without degrading the latter.
2Measurement precision
If multiple PCR assays are run to diagnose various pathogens, then diagnostic accuracy is improved, but sample volume requirements increase and handling complexity increases
Solution Approach 1:
The patent combines multiple PCR assays into a single multiplex reaction where multiple pathogen-specific primers and probes are used simultaneously in one reaction tube. This merging approach maintains diagnostic accuracy for multiple pathogens while reducing sample volume requirements and handling complexity compared to running separate assays.
Solution Approach 2:
The patent creates a universal extraction and amplification system that can detect multiple different pathogens using the same reagent mix and protocol. The system uses pathogen-specific molecular targets within a universal reaction framework, allowing one system to perform multiple diagnostic functions.
3Measurement precision
If large volume of sample is used to gather adequate reaction templates for low concentration pathogen nucleic acid, then detection sensitivity is improved, but sample availability may be insufficient
Solution Approach 1:
The patent performs preliminary nucleic acid extraction and concentration steps before the PCR amplification. This preliminary action concentrates pathogen nucleic acid from limited sample volume into a smaller, concentrated volume that provides adequate templates for sensitive detection without requiring large initial sample volumes.
Solution Approach 2:
The patent uses nested PCR approaches where a first amplification step enriches target nucleic acid, followed by a second amplification step with pathogen-specific primers. This parameter change in amplification strategy increases detection sensitivity from limited templates without requiring large sample volumes.
4Productivity
If multiplex PCR is used to concurrently assay for multiple targets, then productivity is improved, but robustness of high level multiplex reactions decreases and analysis of multiple products becomes difficult
Solution Approach 1:
The patent uses different fluorescent labels with distinct emission spectra for different pathogen targets in the multiplex assay. Each probe is optimized for its specific target with appropriate local conditions (probe sequence, fluorophore selection), allowing simultaneous detection while maintaining individual reaction robustness and enabling clear differentiation of multiple products through spectral 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
This approach enables efficient extraction and amplification of nucleic acids from tough samples without degrading other nucleic acids, improving diagnostic speed and accuracy by minimizing contamination and sample volume requirements, while allowing for simultaneous testing of multiple pathogens in a single reaction.
Implementation Method 1
The plurality of magnetic beads are configured to recover the nucleic acid from the lysate
Implementation Method 2
a bead milling system for nucleic acid extraction
Implementation Method 3
thermal cycling and fluorescence detection within a closed system
Implementation Method 4
fluorescence detection within a closed system
Data Source
AI summary
Instruments and methods for amplifying nucleic acids in a sample provided in a flexible, self-contained, substantially closed sample container.