PCR Kit-of-Parts Using Orthogonally Cleavable Linkers
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Solution Overview
Problem
Current PCR systems face inefficiencies due to bead aggregation and slower reaction rates on solid surfaces, which hinder rapid and sensitive amplification and detection of nucleic acids.
Innovation Solution
The use of orthogonally cleavable linkers to attach PCR reagents to solid-phase beads, allowing controlled release into solution for faster hybridization and elongation, combined with rapid thermocycling, enables real-time quantitative PCR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PCR reagents are attached to solid-phase beads, then ease of handling and containment is improved, but reaction speed and sensitivity deteriorate due to slower surface-based hybridization and elongation
Solution Approach 1:
PCR reagents (primers, polymerase, nucleotides) are pre-attached to magnetic beads before the reaction begins. This preliminary attachment allows for easy handling, mixing, and containment of reagents during sample preparation, while the magnetic properties enable simple separation and washing steps before amplification.
Solution Approach 2:
The patent changes the physical state of the reaction from surface-bound to solution-phase by using orthogonally cleavable linkers. These linkers can be selectively broken using specific stimuli (light, heat, or chemical treatment) to release the pre-attached reagents into solution, where they can participate in rapid solution-phase PCR reactions rather than slow surface-based reactions.
2Adaptability or versatility
If orthogonally cleavable linkers are used to attach reagents to beads, then controlled release into solution is enabled, but device complexity increases
Solution Approach 1:
The attachment mechanism is segmented into multiple independent linker types with distinct release triggers. Different linkers respond to different stimuli (photocleavable linkers respond to light, thermally cleavable linkers respond to heat, chemically cleavable linkers respond to specific chemicals), allowing selective release of different reagent types by applying the appropriate stimulus to each population of beads.
Solution Approach 2:
Orthogonally cleavable linkers serve as intermediary molecules between the magnetic beads and PCR reagents. These linkers provide a controllable, reversible attachment mechanism that enables precise temporal and spatial control over reagent release, facilitating complex multi-step protocols with simple magnetic bead manipulations.
3Productivity
If rapid thermocycling is implemented, then amplification speed is improved, but energy consumption and thermal stress increase
Solution Approach 1:
The system employs rapid periodic temperature cycling between denaturation, annealing, and extension temperatures. By using magnetic beads with controlled-release linkers, the system can quickly transition between temperature states without the thermal mass burden of large reaction volumes, enabling faster thermocycling rates while managing energy consumption through efficient heat transfer.
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 enhances the speed and sensitivity of PCR by facilitating solution-phase reactions and targeted heating, resulting in rapid and efficient amplification and detection of nucleic acids.
Implementation Method 1
a first oligonucleotide bound to a bead by a cleavable linker; a second oligonucleotide bound to a bead by a cleavable linker; and an enzyme bound to a bead by a cleavable linker; wherein each cleavable linker is independently selected from a photocleavable linker and a thermally cleavable linker
Implementation Method 2
each cleavable linker is independently selected from a photocleavable linker and a thermally cleavable linker
Implementation Method 3
a heater; irradiating the thermocycling chamber with light of a wavelength sufficient to cleave the photocleavable linker
Data Source
AI summary
A PCR kit-of-parts is described. The kit-of-parts comprises a first oligonucleotide bound to a bead by a cleavable linker; a second oligonucleotide bound to a bead by a cleavable linker; and an enzyme bound to a bead by a cleavable linker; wherein the first and second oligonucleotide form an oligonucleotide pair complementary to a nucleic acid of interest and the enzyme is capable of extending nucleic acid strands; and each cleavable linker is independently selected from a photocleavable linker and a thermally cleavable linker. Also described is a method of performing PCR and a PCR system.