Flow Cell Surface Chemistry for Spatial DNA Tagmentation
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Solution Overview
Problem
Existing methods for DNA fragmentation and tagging generate excessive waste, require expensive instruments, and are time-consuming, limiting the efficiency of DNA sequencing workflows.
Innovation Solution
Flow cells with surface chemistry that enable tagmentation, amplification, and sequencing in a single workflow, allowing for the reuse of flow cells for multiple cycles and spatial indexing of DNA samples through controlled activation of transposome complexes using light, heat, or pH changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods for DNA fragmentation and tagging are used, then DNA sequencing can be performed, but excessive waste is generated, expensive instruments are required, and the process is time-consuming
Solution Approach 1:
The patent combines multiple separate operations (DNA fragmentation, tagging, amplification, and sequencing) into a single integrated flow cell workflow. The flow cell surface is functionalized to perform tagmentation of DNA templates, eliminating the need for separate fragmentation and tagging instruments, thereby reducing waste, lowering costs, and improving efficiency.
Solution Approach 2:
The flow cell is designed with universal surface chemistry that enables multiple functions: it can perform tagmentation, amplification, and sequencing in a single device. The flow cell can be reused for multiple cycles of transposome complex binding and tagmentation, making it a multi-functional platform that replaces multiple specialized instruments.
2Productivity
If existing fragmentation and tagging methods are used, then DNA sequencing is achieved, but expensive instruments are required
Solution Approach 1:
The patent merges multiple expensive instruments (fragmentation device, tagging device, amplification device) into a single flow cell system. The flow cell surface chemistry enables all these functions to be performed in one device, significantly reducing instrument cost and complexity while maintaining sequencing capability.
Solution Approach 2:
The flow cell uses a disposable surface coating that can be easily applied and removed, replacing the need for expensive, complex, and difficult-to-maintain instruments. The surface chemistry allows for low-cost, high-throughput processing without requiring expensive instrumentation.
3Productivity
If existing fragmentation and tagging methods are used, then DNA sequencing is performed, but the process is time-consuming
Solution Approach 1:
The patent combines multiple time-consuming steps (fragmentation, tagging, amplification) into a single integrated workflow that can be performed simultaneously in the flow cell. This parallel processing approach dramatically reduces total processing time while maintaining high sequencing output.
Solution Approach 2:
The flow cell enables continuous processing where DNA templates undergo tagmentation, amplification, and sequencing in an uninterrupted workflow. The surface chemistry allows for continuous binding and processing of transposome complexes, eliminating idle time between steps and maximizing productivity.
4Productivity
If flow cell surface chemistry is used for repurposing, then workflow efficiency is improved, but the complexity of surface chemistry activation is increased
Solution Approach 1:
The patent uses parameter changes (light activation, heat, pH) to control the activation of transposome complexes on the flow cell surface. These physical and chemical parameter changes provide simple, reliable, and controllable methods for activating the surface chemistry, making the complex process straightforward and easily automatable.
Solution Approach 2:
The patent replaces complex mechanical activation systems with simpler optical, thermal, and chemical activation methods. Light activation, heat treatment, and pH changes provide straightforward control mechanisms that are easier to implement and automate compared to mechanical systems, reducing overall system complexity while maintaining workflow efficiency.
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 efficiency by streamlining the process, enabling indexing and enrichment of DNA samples, and allowing multiple samples to be processed with spatial control, reducing waste and costs.
Implementation Method 1
Other examples of the flow cells disclosed herein include surface chemistry that is light activated. These example flow cells enable spatial positioning control during surface preparation and/or methods taking place on the flow cell surface.
Implementation Method 2
Other examples of the flow cells disclosed herein utilize heat, light, or a pH change to activate transposome complexes in a predetermined position/area of the flow cell.
Implementation Method 3
Other examples of the flow cells disclosed herein utilize heat, light, or a pH change to activate transposome complexes in a predetermined position/area of the flow cell.
Data Source
AI summary
An example of a flow cell includes a substrate having depressions separated by interstitial regions: a polymeric hydrogel positioned within each of the depressions; and a plurality of transposome complexes immobilized within each of the depressions by a biotin-containing linker. In this example, each of the plurality of the transposome complexes is of a single type including a transposon end with a portion of a transferred strand hybridized to a portion of a non-transferred strand, wherein the transferred strand includes a first amplification domain and is free of an index sequence.