Multiplex PCR Primer Library Annealing Temperature Optimization
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Solution Overview
Problem
Current multiplex PCR methods for nucleic acid analysis suffer from the formation of non-target amplification products, such as primer dimers, which limit the use of amplified products for further analysis, especially in applications like Non-Invasive Prenatal Genetic Diagnosis (NPD), where accuracy and specificity are critical for detecting chromosomal abnormalities.
Innovation Solution
The method involves contacting a nucleic acid sample with a library of non-immobilized primers that simultaneously hybridize to multiple target loci, followed by primer extension reaction conditions, where the annealing temperature is set above the melting temperature of the primers to reduce dimer formation, and the reaction mixture is subjected to extended annealing steps to amplify target amplicons effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple primer pairs are combined in the same PCR reaction to amplify multiple targets, then assay throughput and sample utilization efficiency are improved, but non-target amplification products such as primer dimers are generated
Solution Approach 1:
The patent changes the temperature parameter by setting the annealing temperature above the melting temperature of the primers. This parameter change selectively suppresses non-target amplification (primer dimers) while maintaining target amplification efficiency, thereby resolving the contradiction between high throughput and reduction of harmful byproducts
Solution Approach 2:
The patent performs preliminary selection of primer pairs based on their melting temperatures before conducting the multiplex PCR. By pre-screening primers and matching them with appropriate annealing temperatures, the method prevents formation of primer dimers before the amplification reaction begins, thus eliminating harmful factors while maintaining productivity
2Adaptability or versatility
If the number of primers is increased to amplify more targets, then multiplexing capability is improved, but the risk of generating non-target amplicons increases
Solution Approach 1:
The patent applies parameter changes by adjusting the annealing temperature to be above the melting temperature of the primers. This temperature adjustment allows a higher number of primer pairs to be used in multiplexing while suppressing non-target amplicon formation, thus resolving the contradiction between versatility and harmful factor generation
Solution Approach 2:
The patent incorporates a screening process that evaluates primer pair compatibility and predicts dimer formation risk before final primer selection. This feedback mechanism allows optimization of primer combinations to maximize multiplexing capability while minimizing the risk of non-target amplification
3Productivity
If standard annealing temperature is used to amplify multiple targets, then amplification efficiency is maintained, but primer dimer formation limits the use of amplified products
Solution Approach 1:
The patent changes the annealing temperature parameter from standard conditions to above the melting temperature of the primers. This modification maintains amplification efficiency for target sequences while significantly reducing primer dimer formation, thereby improving both productivity and reliability of the amplified products
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 significantly reduces the formation of non-target amplicons, enhancing the sensitivity and specificity of nucleic acid amplification, thereby improving the accuracy of NPD and other applications by ensuring that a high percentage of target amplicons are produced with minimal primer dimers.
Implementation Method 1
contacting the nucleic acid sample with a library of non-immobilized primers that simultaneously hybridize to multiple target loci
Implementation Method 2
followed by primer extension reaction conditions
Data Source
AI summary
The invention provides methods for simultaneously amplifying multiple nucleic acid regions of interest in one reaction volume as well as methods for selecting a library of primers for use in such amplification methods. The invention also provides library of primers with desirable characteristics, such as minimal formation of amplified primer dimers or other non-target amplicons.