Multiplex Pyrosequencing with Non-Interfering Identification Tags
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Solution Overview
Problem
Current multiplex PCR methods for molecular differential diagnostic assays face challenges such as contamination, primer specificity issues, uneven amplification efficiency, and the need for multiple reaction conditions, making it difficult to accurately analyze clinical samples containing multiple pathogens within a short timeframe.
Innovation Solution
A multiplex method using non-interfering, non-canceling target-specific polynucleotide identification tags for pyrosequencing, which allows for the simultaneous amplification and sequencing of multiple DNA or RNA targets within a single reaction, utilizing specific primers and sequences that do not interfere with polymerase function or primer binding, enabling accurate detection of multiple pathogens in a single cassette.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiplex PCR is used to amplify multiple nucleic acids simultaneously, then the time required for analysis is reduced, but primer specificity and amplification efficiency deteriorate
Solution Approach 1:
The patent divides the primer set into multiple groups, where each group is specific to a particular target sequence. This segmentation allows each primer group to bind specifically to its intended target without interfering with other targets, thereby maintaining primer specificity while enabling simultaneous amplification of multiple nucleic acids in a single reaction.
Solution Approach 2:
The patent applies different primer sequences and binding conditions to different target regions within the same reaction system. Each target sequence has associated primers with specific binding characteristics, allowing localized optimization of amplification for each target while maintaining overall multiplex capability.
2Productivity
If multiple high-concentration primers are used in a single multiplex reaction, then amplification of multiple targets is achieved, but primer dimmers and non-specific background amplification increase
Solution Approach 1:
The patent segments primers into distinct groups based on their target specificity. Each primer group is designed to bind to a specific target sequence with high affinity, reducing cross-hybridization and primer-dimer formation. This segmentation strategy enables multiple targets to be amplified simultaneously without the harmful effects of primer interference.
Solution Approach 2:
The patent introduces a controlled annealing condition as an intermediary parameter that mediates between the competing primer binding events. By optimizing the annealing temperature and timing, the system allows specific primer-target binding to occur preferentially, preventing non-specific interactions and primer dimmers while maintaining high productivity.
3Speed
If standard multiplex PCR is used for rapid pathogen detection, then detection speed is improved, but contamination risk and manual intervention requirements increase
Solution Approach 1:
The patent designs the multiplex PCR system to be self-contained with all necessary reagents, primers, and controls included in a single reaction mixture. This self-service approach eliminates the need for multiple manual intervention steps, reducing contamination risk while maintaining rapid detection capability. The system performs all amplification and detection functions within a single closed reaction.
4Measurement precision
If multiple post-PCR clean-up and wash steps are performed, then specificity is improved, but time and manual effort required increase
Solution Approach 1:
The patent extracts and eliminates the need for separate post-PCR clean-up and wash steps by incorporating specificity controls within the amplification reaction itself. The primer design and reaction conditions are optimized to prevent non-specific amplification from the outset, allowing direct analysis of the amplification products without time-consuming subsequent processing steps.
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 method significantly reduces the time and effort required for sample analysis, enhances amplification efficiency, and minimizes contamination by allowing for accurate detection of multiple pathogens in a single reaction, facilitating quicker and more precise clinical diagnostics.
Implementation Method 1
The development of nucleic acid amplification methodologies, for instance the polymerase chain reaction (PCR), enables the use of DNA amplification for a variety of uses
Implementation Method 2
pyrosequencing the amplified products through the non-interfering, non-canceling target-specific polynucleotide identification tag sequence to detect the presence of one or more specific polynucleotide identification tags
Data Source
AI summary
The present disclosure generally pertains to a multiplex method for analyzing samples comprising using polynucleotide amplification to produce amplified products wherein one or more target sequences are tagged with a non-interfering, non-canceling target-specific polynucleotide identification tag, pyrosequencing the amplified products through the non-canceling target-specific polynucleotide identification tag sequence to detect the presence of one or more specific polynucleotide identification tags. The presence of a specific polynucleotide identification tag being correlated with the presence of a specific target sequence.