Oligonucleotide Identification via Mediator PCR Amplification
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Solution Overview
Problem
Current methods for screening large libraries of compounds face challenges in distinguishing active compounds from non-specific binders, known as the signal-noise problem, especially when dealing with combinatorial chemistry and non-biological molecules, where traditional genetic screening methods are limited to biological molecules and struggle with amplification and identification of active non-natural oligonucleotides.
Innovation Solution
A method involving specific amplification of hybridized oligonucleotides using PCR, where a coding sequence and a single fixed sequence are used to extend and create a new primer binding site, allowing for the identification of active library members by amplifying only hybridized sequences, thereby overcoming the limitations of traditional genetic screening methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional genetic screening methods are used to screen large libraries, then active compounds can be identified through amplification, but the method is limited to biological molecules and cannot screen non-biological molecules or non-natural oligonucleotides
Solution Approach 1:
The patent introduces a mediator oligonucleotide that hybridizes to the target non-natural oligonucleotide, enabling amplification of molecules that would otherwise be non-amplifiable. The mediator acts as an intermediary between the non-biological target and the PCR amplification machinery, allowing genetic screening methods to be applied to non-biological molecules.
Solution Approach 2:
The patent creates a copy of the target non-natural oligonucleotide sequence through hybridization with a mediator oligonucleotide. This copying mechanism allows the information from non-amplifiable molecules to be transferred to amplifiable mediator sequences, enabling identification through standard PCR methods.
2Quantity of substance
If combinatorial chemistry is used to generate large libraries, then vast numbers of compounds can be synthesized, but the signal-noise problem arises where non-specific binders outnumber active compounds
Solution Approach 1:
The patent extracts only the hybridized sequences from the total library through selective amplification. By using PCR to amplify only those sequences that hybridized to the target, the method extracts the signal (active compounds) from the noise (non-specific binders), enabling precise identification even in large libraries with low signal-noise ratios.
Solution Approach 2:
The patent implements a feedback mechanism where hybridization results directly control amplification. Sequences that successfully hybridize to the target provide the feedback signal that triggers their selective amplification, creating a positive feedback loop that enriches for active compounds while suppressing non-specific binders.
3Productivity
If assay volumes are reduced to increase screening capacity, then more compounds can be tested, but the robustness of the screening process is jeopardized
Solution Approach 1:
The patent creates amplified copies of hybridized sequences, allowing a single hybridization event to generate sufficient signal for detection. This copying mechanism enables robust detection even in reduced assay volumes, as the amplification step compensates for the smaller initial sample size while maintaining process reliability.
4Measurement precision
If iterated cycles of diversification and selection are used to evolve libraries, then active compounds can be enriched, but the process requires numerous manipulations and time
Solution Approach 1:
The patent enables continuous enrichment by allowing the amplified products to serve as templates for subsequent hybridization and amplification cycles. The useful action of selection and amplification continues without interruption, with each cycle building on the previous one, thereby achieving high enrichment precision without requiring repeated manual manipulations between cycles.
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 enables the efficient identification of active oligonucleotides within large libraries, even when non-active members outnumber active ones, by selectively amplifying hybridized sequences, thus improving the signal-noise ratio and facilitating the identification of candidate compounds.
Implementation Method 1
specifically amplifying the sequence of a hybridised oligonucleotide specie by extending the 3'-end of the sequence with a polymerase in a PCR process
Implementation Method 2
a library of oligonucleotides is hybridised under hybridisation conditions to a complementary library of oligonucleotides
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The present invention discloses methods for identification of oligonucleotides by manipulation of the information content a plurality of oligonucleotides. A main object of the methods is the identification of new molecular activity such as new ligands of interest for the development of therapeutics or in the field of nanotechnology.