Flow Cell Hydrogel Patterning for Balanced Paired-End Sequencing
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Solution Overview
Problem
Existing sequencing technologies face challenges with reproducibility and imbalanced cluster intensities due to physical patterning of primer sets on flow cell surfaces, leading to inconsistent sequencing results.
Innovation Solution
A method is introduced to alter a single primer set on a polymeric hydrogel within flow cell depressions using orthogonal cleaving chemistry, creating distinct primer sets in different regions to separate forward and reverse amplicon strands spatially, enabling simultaneous paired-end sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If physical patterning is used to attach different primer sets to different regions of the flow cell surface, then simultaneous paired-end sequencing can be enabled, but reproducibility decreases and cluster intensities become imbalanced
Solution Approach 1:
The flow cell surface is divided into multiple depressions, each containing a polymeric hydrogel with primer sets. This segmentation allows different primer sets to be physically separated in space while maintaining consistent attachment conditions within each depression, enabling simultaneous paired-end sequencing while improving reproducibility through uniform hydrogel-based attachment.
Solution Approach 2:
A polymeric hydrogel is introduced as an intermediary material between the flow cell surface and the primer sets. The hydrogel provides a consistent, controlled environment for primer attachment, eliminating the variability associated with direct physical patterning on the flow cell surface and ensuring balanced cluster intensities.
2Adaptability or versatility
If physical patterning is used to create different primer sets on the flow cell surface, then regional primer differentiation is achieved, but manufacturing precision decreases resulting in imbalanced cluster intensities
Solution Approach 1:
Different primer sets are attached to polymeric hydrogels within different depressions of the flow cell. Each depression maintains uniform local conditions through the hydrogel matrix, ensuring consistent primer attachment and balanced cluster intensities while still allowing regional differentiation of primer sets for paired-end sequencing.
Solution Approach 2:
The attachment method is changed from direct physical patterning on the flow cell surface to hydrogel-mediated attachment within depressions. This parameter change in the attachment mechanism provides more uniform primer distribution and consistent cluster intensities across different regions of the flow cell.
Data Source
Figure 1A~1D
Figure 2A~2B
Figure 3A~3G
AI summary
A polymeric hydrogel is applied to a surface of a substrate including depressions separated by interstitial regions. Each depression includes a UV blocking layer positioned at a first region, and a second region that is transparent to UV and adjacent to the first region. Before or after the hydrogel is applied, a primer set is grafted to the hydrogel. The primer set includes 3' blocked uncleavable first and second pre-primers. The hydrogel or grafted layer is removed from the interstitial regions. At a first predetermined region of the grafted layer within the second region: the first pre-primers are altered to introduce cleavable first primers; and the second pre-primers are altered to introduce uncleavable second primers. At a second predetermined region of the grafted layer within the first region: the first pre-primers are altered to introduce uncleavable first primers; and the second pre-primers are blocked to introduce cleavable second primers.