Multiplex PCR Primer Library Design for Non-Target Amplification
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Solution Overview
Problem
Current multiplex PCR methods for nucleic acid analysis face challenges in reducing non-target amplification products, such as primer dimers, which limit the accuracy and utility of amplified products for further analysis, particularly in applications like Non-Invasive Prenatal Genetic Diagnosis (NPD), where high accuracy and specificity are crucial.
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 under optimized conditions, including elevated annealing temperatures and extended annealing times, to selectively amplify target amplicons while minimizing dimer formation, using techniques like high-throughput sequencing and primer selection based on dimer interaction scores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple primer pairs are combined in multiplex PCR to amplify multiple target loci simultaneously, then assay throughput and sample utilization efficiency are improved, but non-target amplification products such as primer dimers increase, reducing accuracy and utility of amplified products
Solution Approach 1:
The patent performs preliminary bioinformatic analysis and primer design to predict and minimize dimer formation before the actual PCR reaction. Primers are selected and optimized in advance based on their sequence characteristics and potential interactions, preventing the formation of non-target products rather than addressing them during amplification.
Solution Approach 2:
The patent optimizes multiple reaction parameters including primer concentration, annealing temperature, and extension time to favor specific amplification over dimer formation. By adjusting these parameters, the system maximizes target amplicon yield while minimizing non-target products, resolving the contradiction between throughput and product quality.
2Adaptability or versatility
If the number of primers in multiplex PCR is increased to amplify more target loci, then the coverage of genetic analysis is improved, but the risk of generating non-target amplicons increases, limiting the use of amplified products
Solution Approach 1:
The patent performs preliminary bioinformatic analysis and primer design to predict and minimize dimer formation before the actual PCR reaction. Primers are selected and optimized in advance based on their sequence characteristics and potential interactions, preventing the formation of non-target products rather than addressing them during amplification.
Solution Approach 2:
The patent incorporates iterative optimization where amplification results are analyzed and used to refine primer selection and reaction conditions. This feedback loop allows continuous improvement of assay specificity while maintaining high coverage, enabling the system to scale up primer numbers without proportionally increasing non-target products.
3Ease of operation
If standard multiplex PCR conditions are used to amplify multiple targets, then the process is simple and fast, but primer dimers form significantly, reducing the utility of amplified products for further analysis
Solution Approach 1:
The patent performs preliminary bioinformatic analysis and primer design to predict and minimize dimer formation before the actual PCR reaction. Primers are selected and optimized in advance based on their sequence characteristics and potential interactions, preventing the formation of non-target products rather than addressing them during amplification.
Solution Approach 2:
The patent optimizes multiple reaction parameters including primer concentration, annealing temperature, and extension time to favor specific amplification over dimer formation. By adjusting these parameters, the system maximizes target amplicon yield while minimizing non-target products, resolving the contradiction between throughput and product quality.
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 non-target amplification products, enhancing the specificity and sensitivity of nucleic acid analysis, thereby improving the accuracy of NPD and other applications by ensuring that at least 95% of amplified products are target amplicons, thus increasing the reliability of genetic diagnostics.
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 under optimized conditions to selectively amplify target amplicons
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.