Competitive Nucleotide Analogs for Sequencing Accuracy
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Solution Overview
Problem
Current single molecule real-time nucleic acid sequencing methods face challenges due to non-specific interactions and incorrect base calling caused by random sampling and immobilization of nucleotides, leading to confounding signals and reduced accuracy.
Innovation Solution
Incorporating competitive, unincorporatable nucleotide analogs that reversibly associate with polymerase enzymes to modulate reaction rates and reduce non-specific interactions, allowing for improved detection and stringency in nucleic acid sequence analysis by distinguishing actual incorporation events from redundant sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nucleotides are added to the reaction mixture for real-time sequencing, then the polymerase can incorporate bases and extend the primer, but non-specific interactions and random sampling cause confounding signals and reduce accuracy
Solution Approach 1:
A competitive inhibitor molecule is introduced as an intermediary that mediates between the nucleotide pool and the polymerase enzyme. This inhibitor competes with nucleotides for binding to the polymerase, thereby controlling the rate of nucleotide incorporation and reducing non-specific interactions that cause confounding signals.
Solution Approach 2:
The concentration of competitive inhibitor is adjusted to optimize the reaction kinetics. By changing the parameter of inhibitor concentration, the patent controls the rate of nucleotide incorporation, allowing sufficient time for accurate detection while maintaining productive sequencing throughput.
2Speed
If the polymerase reaction proceeds rapidly, then sequencing throughput increases, but non-specific interactions increase leading to confounding signals
Solution Approach 1:
The competitive inhibitor serves as a mediator that modulates the interaction between polymerase and nucleotides. By competing for the same binding site, it reduces non-specific interactions without completely blocking the specific incorporation events needed for sequencing.
Solution Approach 2:
The competitive inhibitor is used at concentrations that provide partial inhibition, allowing enough nucleotide incorporation to maintain sequencing speed while reducing excessive non-specific interactions that create confounding signals.
3Adaptability or versatility
If multiple nucleotide types are present simultaneously, then parallel incorporation can occur, but it becomes difficult to distinguish actual incorporation events from redundant sampling
Solution Approach 1:
The competitive inhibitor mediates the competition between multiple nucleotide types and the polymerase. This creates a more controlled environment where specific incorporation events stand out against the background of competitive binding, improving detectability.
Solution Approach 2:
The presence of competitive inhibitor creates periodic binding and unbinding events that rhythmically modulate the reaction. This periodicity helps distinguish true incorporation events from random sampling, as genuine incorporations occur at distinct intervals rather than continuously.
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
Enhances the accuracy of nucleic acid sequencing by reducing non-specific interactions and improving the timing and rate control of incorporation events, leading to more reliable base calling and longer read lengths with lower reagent consumption.
Implementation Method 1
employ competitively inhibiting compositions in conjunction with the reactants for the monitored reaction. The presence of such competitors provides a mechanism for modulating the rate of the monitored reaction
Implementation Method 2
polymerase mediated, template dependent nucleic acid synthesis is modulated in accordance with the invention by providing within the reaction mixture competitive inhibitors to the polymerase binding of incorporatable nucleoside polyphosphates
Implementation Method 3
processes that add multiple different types of nucleotides each labeled with a different fluorescent dye, and identify which base was incorporated based upon the dye incorporated at any given step
Data Source
AI summary
Compositions, methods, substrates and systems for use in analysis of single molecule reactions and particularly single molecule nucleic acid sequence analysis. Compositions that include non-reactive, distinguishable or undetectable competitive substrates for the reaction system of interest are provided, as well as their use in systems and substrates for such applications, such compounds typically preferably polyphosphate chains or analogous structures.