Multiplex PCR Primer Libraries to Reduce Non-Target Amplicons
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Solution Overview
Problem
Existing multiplex PCR methods suffer from the formation of non-target amplification products, such as amplified primer dimers, which limit the use of amplified products for further analysis and assays, particularly in applications like Non-Invasive Prenatal Genetic Diagnosis (NPD), where improved sensitivity and specificity are needed to reduce time and cost.
Innovation Solution
A method involving a library of non-immobilized primers that simultaneously hybridize to multiple target loci, followed by primer extension reaction conditions, with optimized annealing temperatures and times to minimize dimer formation, and subsequent sequencing or array hybridization to detect target amplicons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple oligonucleotide primers are combined in the same PCR reaction to amplify multiple target nucleic acids simultaneously, then assay throughput increases and sample usage becomes more efficient, but non-target amplification products such as primer dimers are generated which limit the use of amplified products for further analysis
Solution Approach 1:
The invention divides the multiplex PCR process into two separate stages: (1) a first PCR reaction that amplifies all target loci simultaneously using multiple primer pairs, and (2) a second PCR reaction that uses a single primer pair to amplify only the desired target from the first PCR products. This segmentation eliminates primer-dimer formation in the second stage while maintaining the throughput benefits of multiplexing in the first stage.
Solution Approach 2:
The invention extracts the problematic element (multiple primer pairs) from the final amplification step. By using only a single primer pair in the second PCR reaction, the method removes the source of non-target amplification products while preserving the ability to detect multiple targets through sequence-specific primers used in the first reaction.
2Adaptability or versatility
If the number of primers in multiplex PCR is increased to amplify more targets, then more target loci can be detected simultaneously, but the risk of generating non-target amplicons increases significantly
Solution Approach 1:
The invention segments the primer usage across two reactions: the first reaction uses multiple primer pairs to achieve high versatility in detecting numerous target loci, while the second reaction uses a single primer pair to eliminate non-target amplicon formation. This segmentation allows the system to achieve both high adaptability and high specificity.
Solution Approach 2:
The first PCR reaction serves as a preliminary step that prepares the target amplicons for subsequent specific amplification. By pre-amplifying all targets in the first reaction, the method enables the second reaction to focus solely on a single target with high specificity, thus preventing non-target amplicon formation while maintaining the ability to detect multiple targets.
3Productivity
If standard multiplex PCR methods are used to improve detection speed and reduce cost, then time and resource efficiency increases, but sensitivity and specificity are insufficient for applications like Non-Invasive Prenatal Genetic Diagnosis
Solution Approach 1:
The two-stage PCR approach segments the amplification process to achieve both efficiency and precision: the first reaction maintains productivity by amplifying multiple targets simultaneously, while the second reaction enhances measurement precision by performing single-target amplification with a single primer pair, thereby achieving both speed and accuracy required for NPD applications.
Solution Approach 2:
The first PCR products serve as an intermediary between the initial complex multiplex reaction and the final high-specificity amplification. This intermediary step allows the method to benefit from both approaches: the efficiency of multiplexing and the precision of single-target PCR, thereby achieving the sensitivity and specificity needed for NPD while maintaining cost-effectiveness.
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 amplicons, enabling efficient amplification and detection of multiple target loci with high accuracy and specificity, facilitating applications like NPD by improving sensitivity and reducing time and cost.
Implementation Method 1
a library of non-immobilized primers that simultaneously hybridize to multiple target loci
Implementation Method 2
followed by primer extension reaction conditions to minimize dimer formation
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.