Isothermal Nucleic Acid Amplification Using Universal Hairpin Adapters
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Solution Overview
Problem
Conventional loop-mediated isothermal amplification (LAMP) methods are limited in multiplexing capabilities, making it difficult to amplify multiple samples or loci in a single tube reaction, and are not suitable for surface-bound isothermal amplification, which restricts their use in high-throughput nucleic acid sequencing and diagnostic applications.
Innovation Solution
The method involves engineering single-stranded nucleic acid molecules with hairpin regions at both ends, allowing for self-priming and concatameric amplification, and immobilizing primers on a solid support to enable clonal amplification, enabling multiplexing and surface-bound amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional LAMP uses multiple primers for each amplicon, then amplification specificity is improved, but multiplexing capability deteriorates
Solution Approach 1:
The patent introduces universal adapter sequences that can be used across multiple different amplicons. These adapters contain conserved regions that bind to common primers, allowing a single primer set to amplify multiple different target sequences simultaneously. This universal adapter approach enables multiplexing while maintaining specificity through the unique regions of each adapter that still allow specific binding to their respective targets.
Solution Approach 2:
The patent segments the primer-binding regions into two functional parts: universal adapter sequences and locus-specific sequences. The universal adapters provide the common binding site for multiplexing, while the locus-specific portions maintain target specificity. This segmentation allows different amplicons to be distinguished by their unique regions while sharing common amplification machinery through the universal adapters.
2Speed
If conventional LAMP is performed in solution, then amplification speed is improved, but surface-bound amplification capability deteriorates
Solution Approach 1:
The patent transitions the amplification reaction from a purely solution-phase process to a surface-bound process by immobilizing adapters or primers on solid supports. This dimensional change from 3D solution to 2D surface enables clonal amplification and high-throughput sequencing applications while maintaining amplification efficiency through optimized surface chemistry and probe design.
Solution Approach 2:
The patent uses adapter sequences as intermediaries that bridge the target DNA and the solid support surface. These adapters contain regions that bind specifically to target sequences and other regions that can be immobilized on surfaces, thereby mediating the connection between the nucleic acid amplification and the solid-phase detection platform.
3Manufacturing precision
If multiple single-plex reactions are run in parallel to achieve multiplexing, then amplification specificity is maintained, but reaction complexity and cost deteriorate
Solution Approach 1:
The patent merges multiple single-plex reactions into a single multiplexed reaction by using universal adapters that allow multiple different target sequences to be amplified simultaneously in the same tube with a common primer set. This combining approach maintains the specificity of individual amplicons while reducing the number of separate reactions needed, thereby simplifying the overall workflow and reducing costs.
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 allows for high-multiplex, efficient, and specific amplification of nucleic acid sequences both in solution and on a solid support, overcoming the limitations of conventional LAMP by enabling simultaneous amplification of multiple sequences and generating surface-bound products, thus enhancing diagnostic capabilities and sequencing applications.
Implementation Method 1
engineering single-stranded nucleic acid molecules with hairpin regions at both ends, allowing for self-priming
Implementation Method 2
The 3' end of the hairpin can be extended to make a complete copy of the single stranded nucleic acid molecule
Implementation Method 3
immobilizing primers on a solid support to enable clonal amplification
Data Source
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AI summary
Disclosed is a method for the isothermal amplification of nucleic acid molecules, optionally on a solid support. The method uses single stranded nucleic acids having common / universal hairpin regions at both the 3' and 5' ends, or the extension products thereof.