Substrate Capture Primers for Monoclonal Cluster Amplification
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Solution Overview
Problem
Current cluster amplification methods for polynucleotides in genetic sequencing often result in polyclonal clusters, which can hinder sequencing accuracy due to mixed signals from different polynucleotides, making it difficult to achieve monoclonal clusters suitable for reliable sequencing-by-synthesis (SBS) analysis.
Innovation Solution
The use of substrates with distinct regions having capture primers and orthogonal capture primers of varying lengths, along with removable blocking groups, to selectively amplify target polynucleotides, promoting monoclonality by inhibiting amplification of non-target polynucleotides and enhancing the amplification of specific sequences, thereby creating functionally monoclonal clusters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard cluster amplification methods are used, then amplification efficiency is improved, but polyclonality increases reducing sequencing accuracy
Solution Approach 1:
The substrate is divided into first and second regions with different primer configurations. The first region has capture primers with first adapters, while the second region has capture primers with second adapters. This local differentiation ensures that only target polynucleotides with complementary adapters in each region are amplified, reducing polyclonality while maintaining amplification efficiency in each localized area.
Solution Approach 2:
The amplification process is segmented into two distinct regions on the substrate, each performing a specialized function. The first region captures and amplifies target polynucleotides with first adapters, while the second region captures and amplifies target polynucleotides with second adapters. This segmentation prevents mixed signals from different polynucleotide populations, improving sequencing accuracy.
2Ease of manufacture
If capture primers of uniform length are used, then manufacturing simplicity is maintained, but selective amplification capability is reduced
Solution Approach 1:
Capture primers in the first region are designed with a first length optimized for binding to target polynucleotides with first adapters, while capture primers in the second region are designed with a second length optimized for binding to target polynucleotides with second adapters. This local customization of primer length provides selective amplification capability for different target populations while maintaining relatively simple manufacturing processes.
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 significantly enhances the monoclonality of clusters, improving sequencing accuracy by ensuring that a majority of the signal comes from a single polynucleotide, thus facilitating reliable sequencing, even in complex substrate environments.
Implementation Method 1
The first adapter of a first one of the target polynucleotides is hybridized to a first one of the orthogonal capture primers of the first plurality of orthogonal capture primers, or the second adapter of the first one of the target polynucleotides is hybridized to a first one of the capture primers of the second plurality of capture primers
Implementation Method 2
Cycles of amplification are performed to form clusters on the surface around each seed. The clusters include copies, and complementary copies, of the seed polynucleotides
Data Source
Figure 1A~1C
Figure 2A~2D
Figure 3A~3B
AI summary
A composition for amplifying a polynucleotide is provided that includes a substrate comprising a first region and a second region. A first plurality of capture primers is coupled to the first region of the substrate. A second plurality of capture primers is coupled to the second region of the substrate. The capture primers of the second plurality of capture primers are longer than the capture primers of the first plurality of capture primers. A first plurality of orthogonal capture primers are coupled to the first region of the substrate. A second plurality of orthogonal capture primers are coupled to the second region of the substrate. The orthogonal capture primers of the second plurality of orthogonal capture primers are shorter than the orthogonal capture primers of the first plurality of orthogonal capture primers.