Multiplex Nucleic Acid Amplification via Stage-Specific Polymerase Control
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Solution Overview
Problem
Current nucleic acid amplification techniques, such as PCR, face challenges in rapidly identifying or quantifying critical markers, especially in applications like infectious disease detection and bio-defense, where rapid multiplexing of multiple sequences is required to minimize false positives and manage varying sequence abundances.
Innovation Solution
The method involves controlling target sequence replication times by selecting different lengths of target polynucleotides and using sequence-specific polymerase inhibitors, such as blocking oligonucleotides, to manage polymerase extension times and temperatures in multiplex amplification reactions, allowing for sequential amplification of multiple sequences in a closed reaction vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sequences are amplified simultaneously in a closed reaction vessel, then false positives are minimized and internal controls are allowed, but sequences with widely varying abundances cannot be effectively measured
Solution Approach 1:
The amplification process is divided into multiple sequential stages, each targeting specific sequences based on their replication characteristics. Fast-replicating sequences are amplified in early stages while slow-replicating sequences are amplified in later stages, allowing precise measurement of sequences with widely varying abundances while maintaining reliability through closed-vessel conditions
Solution Approach 2:
The reaction conditions are dynamically adjusted between stages by modifying polymerase extension times. Early stages use shorter extension times to prevent over-amplification of fast sequences, while later stages use longer extension times to enable amplification of slow sequences, thereby achieving precise quantification across different abundance levels
2Measurement precision
If polymerase extension time is increased to amplify slow-replicating sequences, then sequence detection sensitivity is improved, but fast-replicating sequences become over-amplified
Solution Approach 1:
The amplification reaction is segmented into multiple stages with different extension times. Stage 1 uses a first extension time optimized for fast-replicating sequences, while Stage 2 uses a second, longer extension time for slow-replicating sequences. This segmentation prevents over-amplification of fast sequences while enabling detection of slow sequences
Solution Approach 2:
The amplification process employs periodic action by alternating between different extension time conditions in sequential stages. Each stage is activated at specific intervals based on the replication characteristics of target sequences, allowing optimized amplification for different sequence types without interference
3Productivity
If multiple sequences are amplified in parallel, then detection speed is improved, but false positives increase and control over individual sequence amplification is reduced
Solution Approach 1:
Parallel amplification of multiple sequences is achieved through segmentation into stages rather than simultaneous amplification. Each stage targets specific sequences with appropriate extension times, maintaining reliability by preventing cross-interference while preserving detection speed through continuous multi-stage processing
Solution Approach 2:
The system dynamically controls amplification of multiple sequences by adjusting extension times between stages. This dynamic control allows parallel processing of different sequence types with varying replication rates while maintaining reliability through condition optimization for each stage
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 and controlled multiplex nucleic acid amplification, reducing false positives and allowing for the rapid identification of multiple sequences, even when they vary significantly in abundance, thereby enhancing the sensitivity and specificity of detection in applications like infectious disease and bio-defense.
Implementation Method 1
each such blocker oligonucleotide being present at a concentration such that duplexes form with the selected polynucleotide a predetermined percentage of time during the polymerase extension step
Implementation Method 2
extending polynucleotides in the multiplex amplification reaction using a nucleic acid polymerase
Implementation Method 3
a sequentially multiplexed temperature-cycling amplification reaction
Implementation Method 4
a sequentially multiplexed temperature-cycling amplification reaction
Data Source
AI summary
The present invention provides methods and kits for conducting multiplex nucleic acid amplification reactions by controlling target sequence replication times. In one aspect, such control is exerted by selecting different lengths of target polynucleotides for amplification. In another aspect, control is exerted by providing sequence-specific polymerase inhibitors, such as specific blocking oligonucleotides. In accordance with the invention, multiple target polynucleotides can be sequentially amplified in an amplification reaction conducted in different stages, wherein amplification of sequences with longer replication times is permitted in one stage but precluded in other stages by modifying polymerase extension times in the course of the reaction.