Photochemical Polymer Activation for Region-Specific Oligonucleotide Coupling
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Solution Overview
Problem
Existing methods for amplifying polynucleotides in genetic sequencing are limited by the random distribution of clusters and lack of efficient strategies for simultaneous paired-end reads, which affect the reliability of sequencing-by-synthesis (SBS) processes.
Innovation Solution
The method involves selectively irradiating regions of a polymer with light to activate moieties for coupling oligonucleotides, using cyclopropenone-masked dibenzocyclooctynes or other reactive groups, to create distinct regions on a substrate for orthogonal primer hybridization and amplification, enabling simultaneous paired-end reads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random distribution of clusters is used on substrate surface, then simplicity of process is maintained, but reliability of sequencing-by-synthesis deteriorates
Solution Approach 1:
The substrate surface is divided into distinct first and second regions, each containing clusters with specific orientations. This segmentation allows separate control of cluster orientations in different regions, enabling reliable paired-end reads while maintaining manageable process complexity through regional division.
Solution Approach 2:
Different regions of the substrate are given different local qualities - the first region contains clusters oriented in a first direction while the second region contains clusters oriented in a second direction. This local differentiation enables each region to contribute specifically to the paired-end sequencing process, improving overall reliability without requiring complete reconfiguration of the entire substrate.
2Productivity
If simultaneous paired-end reads are enabled, then productivity of sequencing is improved, but device complexity increases
Solution Approach 1:
Clusters are prepared in advance with specific orientations during the cluster generation step, before the actual sequencing process begins. The first region is pre-filled with clusters having first orientation and second region with clusters having second orientation. This preliminary arrangement enables simultaneous paired-end reads during sequencing without requiring complex real-time adjustments, thus improving productivity while controlling device complexity.
Solution Approach 2:
The solution adds a spatial dimension to the sequencing process by creating distinct first and second regions on the substrate surface, each with different cluster orientations. This dimensional approach allows both forward and reverse reads to occur simultaneously in different spatial zones, effectively doubling sequencing productivity without overwhelming device complexity through temporal multiplexing.
3Manufacturing precision
If clusters are confined to defined regions, then manufacturing precision of cluster locations is improved, but area available for amplification is reduced
Solution Approach 1:
The substrate surface is segmented into multiple defined regions (first region and second region), each serving as a confined zone for cluster amplification. This segmentation provides precise location control for clusters while the cumulative area of multiple regions maintains sufficient total space for amplification reactions, resolving the contradiction between precision and available area.
Solution Approach 2:
Instead of confining all clusters to a single small region, the solution expands the confined space into multiple two-dimensional regions on the substrate surface. Each region provides precise localization for its clusters, while the combined area of first and second regions collectively offers adequate space for amplification, thus maintaining both precision and sufficient area through spatial distribution.
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 reliability of sequencing-by-synthesis by allowing simultaneous paired-end reads, improving the accuracy and efficiency of polynucleotide amplification and sequencing.
Implementation Method 1
selectively irradiating a polymer with light causes inactive moieties in a first region of the polymer to be converted to active moieties
Data Source
Figure 1~2B
Figure 2C~2D
Figure 3A~3B
AI summary
In some examples, a method of coupling oligonucleotides to a polymer is provided. Inactive moieties in a first region of a polymer may be selectively irradiated with light, while inactive moieties in a second region of the polymer are not irradiated, to generate first active moieties in the first region of the polymer. The first active moieties may be coupled to first oligonucleotides. The inactive moieties in the second region of the polymer may be irradiated with light to generate second active moieties in the second region of the polymer. The second active moieties may be coupled to second oligonucleotides.