Dynamic Combinatorial Primer Assembly for Nucleic Acid Detection
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Solution Overview
Problem
Current methods for detecting specific nucleic acid sequences in complex biological mixtures face challenges due to the high complexity of genomes, where probes are either too long and prone to mismatches or too short and lack specificity, leading to instability and inefficiency in hybridization processes.
Innovation Solution
The development of a method that assembles complementary primer molecules under dynamic equilibrium conditions using short DNA fragments with specific functional groups, forming a transient imine linker that is later captured by polymerase-dependent chain extension, enabling precise binding and discrimination of nucleic acid targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If longer probes are used to increase specificity, then binding specificity improves, but mismatch discrimination ability deteriorates
Solution Approach 1:
The probe is divided into two separate oligonucleotide fragments that bind to adjacent regions of the target sequence. Each fragment independently contributes to specificity while the combined binding provides mismatch discrimination. This segmentation allows each fragment to maintain short length for good mismatch discrimination while the composite probe achieves long-probe specificity.
Solution Approach 2:
Two separate oligonucleotide fragments are combined into a composite probe structure where both fragments bind simultaneously to the target. The merging of binding events from both fragments creates a cooperative effect that enhances both specificity and mismatch discrimination beyond what either fragment could achieve alone.
2Reliability
If shorter probes are used to improve mismatch discrimination, then mismatch discrimination ability improves, but binding specificity deteriorates
Solution Approach 1:
The probe is divided into two separate oligonucleotide fragments that bind to adjacent regions of the target sequence. Each fragment independently contributes to specificity while the combined binding provides mismatch discrimination. This segmentation allows each fragment to maintain short length for good mismatch discrimination while the composite probe achieves long-probe specificity.
Solution Approach 2:
Two separate oligonucleotide fragments are combined into a composite probe structure where both fragments bind simultaneously to the target. The merging of binding events from both fragments creates a cooperative effect that enhances both specificity and mismatch discrimination beyond what either fragment could achieve alone.
3Stability of the object's composition
If standard hybridization conditions are used, then binding stability improves, but thermodynamic optimization deteriorates
Solution Approach 1:
The probe system employs dynamic combinatorial chemistry where oligonucleotide fragments reversibly associate and dissociate under thermodynamic control. The binding equilibrium dynamically adjusts to favor the most thermodynamically stable configuration, ensuring optimal binding only when both fragments correctly match their target sequences. This dynamic approach replaces static standard hybridization with thermodynamically optimized binding.
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 the efficient detection of specific nucleic acid sequences with high specificity and stability, even in the presence of mismatches, by forming the thermodynamically most stable composite primer, which can be used for downstream processing such as DNA sequencing and target detection.
Implementation Method 1
the functional group on the 3'-DNA fragment forms under conditions of dynamic equilibrium at covalent bond with the functional group on the 5'-DNA fragment
Implementation Method 2
the composite is captured in a downstream processing reaction that is dependent on a polymerase
Implementation Method 3
complementary oligonucleotides could be assembled using imine chemistry from fragments under conditions of dynamic equilibrium
Data Source
AI summary
This invention relates to the field of nucleic acid chemistry, more specifically to compositions of matter that are nucleic acid analogs, and processes that use them. Still more specifically, these compositions comprise two fragments of DNA-like molecules, each having one or more ends modified to carry a reactive group, where the reactive group on one fragment can form a transient covalent bond with the reactive group on the other under conditions of dynamic equilibrium to form a composite, where the composite can then bind to a target oligonucleotide, such as a DNA or RNA molecule. Most specifically, once the transient covalent bond forms, the composite serves as a primer for a template-directed polymerization using a DNA polymerase, an RNA polymerase, or a reverse transcriptase. Once incorporated, the epimerization causes the base pair to be destabilized, the duplex containing the epimerized nucleoside to likewise be destabilized, and the double strand to then disassociate. This leaves the template available to template the synthesis of another complementary oligonucleotide containing the epimerizing base.