Layered Flow Cell Patterning for Paired-End Strand Separation
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Solution Overview
Problem
Current nucleic acid sequencing technologies face challenges in efficiently generating flow cells for sequential and simultaneous paired-end reads, particularly in creating complex surface patterns for orthogonal primer sets and functionalized layers that allow for precise sequencing and separation of forward and reverse strands.
Innovation Solution
The development of flow cells with multi-layer stacks featuring hydrophobic and resin layers, where depressions are defined through etching or imprinting, and functionalized layers are applied to support the attachment of distinct primer sets, enabling simultaneous or sequential paired-end sequencing by controlling cleavage chemistry and spatial separation of strands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex surface patterning is used to create orthogonal primer sets and functionalized layers, then sequencing accuracy and strand separation are improved, but manufacturing complexity and process difficulty increase
Solution Approach 1:
The flow cell surface is segmented into distinct functional regions including hydrophobic regions and hydrophilic regions, each containing specific primer sets. This segmentation allows orthogonal primer sets to be spatially separated into discrete zones, enabling independent control and functionalization of each region while maintaining overall manufacturing simplicity.
Solution Approach 2:
Different regions of the flow cell surface are assigned different local properties: hydrophobic regions repel aqueous solutions and confine reactions to specific zones, while hydrophilic regions attract and retain reagents. Each region contains specifically designed primer sets with unique sequences, providing localized functionality that simplifies the overall patterning process.
2Measurement precision
If spatial separation of forward and reverse strands is implemented, then fluorescence signal separation and sequencing accuracy are improved, but flow cell manufacturing complexity increases
Solution Approach 1:
Hydrophobic materials serve as intermediary elements that passively direct and confine aqueous reaction mixtures to hydrophilic regions. This intermediary mechanism automatically separates forward and reverse strand reactions into different spatial zones without requiring complex active control systems, thereby maintaining manufacturing simplicity while achieving excellent signal separation.
Solution Approach 2:
The flow cell design uses replicated patterns of hydrophobic and hydrophilic regions across the surface, with each replicate containing the necessary primer sets. This copying approach allows mass production of flow cells with consistent patterning through simple replication processes rather than complex individual fabrication.
3Adaptability or versatility
If multiple primer sets with different sequences are attached to different regions, then sequential and simultaneous paired-end sequencing capability is improved, but surface functionalization complexity increases
Solution Approach 1:
The flow cell surface is designed with universal hydrophobic and hydrophilic region templates that can accommodate multiple different primer sets. The same structural framework supports both sequential paired-end sequencing (with cleavable linkers) and simultaneous paired-end sequencing (with orthogonal primer sets), providing multi-functionality without requiring different physical structures for each mode.
Solution Approach 2:
Multiple primer sets are arranged in the spatial dimension across different hydrophobic and hydrophilic regions rather than stacking them vertically or complicating the chemical structure. This spatial arrangement in another dimension allows multiple sequencing modes to be supported simultaneously through simple geometric distribution of functional elements.
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 simplifies the patterning of flow cell surfaces, allowing for efficient generation of flow cells that facilitate simultaneous or sequential paired-end reads, enhancing sequencing accuracy and throughput by ensuring orthogonal primer sets and spatial separation of fluorescence signals.
Implementation Method 1
a hydrophobic layer positioned over the resin layer
Implementation Method 2
defining a depression in a multi-layer stack including a hydrophobic layer over a resin layer by: i) etching through a depth of the hydrophobic layer
Implementation Method 3
a polymeric hydrogel positioned in the depression
Data Source
AI summary
One example of a flow cell includes a base support and a multi-layer stack positioned over the base support. The multi-layer stack includes a resin layer positioned over the base support; and a hydrophobic layer positioned over the resin layer. A depression is defined in the multi-layer stack through the hydrophobic material and through a portion of the resin.