Multiplex Primer Library Selection to Suppress PCR Primer Dimers
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Solution Overview
Problem
Existing multiplex PCR methods suffer from the formation of non-target amplification products, such as 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 the use of a library of non-immobilized primers that simultaneously hybridize to multiple target loci, with optimized annealing temperatures and primer selection based on dimer formation likelihood, followed by primer extension reactions to produce target amplicons, and subsequent sequencing or hybridization to detect these products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple pairs of oligonucleotide primers are combined in the same PCR reaction to amplify multiple target nucleic acids simultaneously, then assay throughput is increased and experimental procedures are simplified, 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 patent employs SWARM-PCR which utilizes changing temperature conditions during the amplification process to differentiate between specific target amplification and non-specific primer dimer formation, allowing selective suppression of harmful byproducts while maintaining productive amplification
Solution Approach 2:
The methodology implements dynamic amplification conditions where reaction parameters such as temperature and primer availability change over time, enabling the system to favor specific target amplification at different stages and minimize primer dimer formation throughout the reaction process
2Adaptability or versatility
If the number of primers is increased to amplify more target loci, then multiplex capability is improved, but the risk of generating non-target amplicons increases significantly
Solution Approach 1:
SWARM-PCR employs dynamic parameter changes including temperature modulation and controlled primer depletion to manage complex multiplex reactions, allowing high multiplex capability while suppressing non-target amplification through time-dependent reaction condition optimization
Solution Approach 2:
The methodology incorporates feedback mechanisms where amplification progress is monitored and reaction conditions are adjusted accordingly to prevent primer dimer accumulation and maintain selective amplification of target sequences even as multiplex complexity increases
3Loss of time
If conventional multiplex PCR is used to amplify multiple targets, then time required for nucleic acid analysis is reduced, but sensitivity and specificity are compromised due to primer dimer formation
Solution Approach 1:
The patent utilizes SWARM-PCR with dynamic temperature and concentration parameter changes that enhance sensitivity and specificity by suppressing primer dimer formation throughout the amplification process, maintaining high measurement precision while achieving rapid simultaneous analysis of multiple targets
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, allowing for efficient simultaneous amplification and detection of multiple loci, enhancing the accuracy and efficiency of NPD by minimizing primer dimers and improving the sensitivity and specificity of genetic analysis.
Implementation Method 1
a library of test primers that simultaneously hybridize to at least 25 different target loci
Implementation Method 2
subjecting the reaction mixture to primer extension reaction conditions to produce amplified products
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.