Emulsion PCR Partition Loading for Accurate Clonal Sequencing
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Solution Overview
Problem
Existing methods for nucleic acid analysis face inefficiencies, low sensitivity, and accuracy due to template loss and Poisson distribution limitations in emulsion PCR, leading to suboptimal reagent usage and increased noise in sequencing workflows.
Innovation Solution
Increasing the ratio of beads to nucleic acid molecules in partitions, allowing for clonal amplification and using multiple primer sets to generate paired-end sequencing reads, thereby enhancing accuracy and sensitivity while optimizing reagent efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a higher ratio of beads to nucleic acid molecules is used in partitions, then clonal copy numbers increase and template loss reduces, but reagent consumption increases
Solution Approach 1:
The reaction system is segmented into multiple partitions (droplets or wells), each containing a limited number of beads and nucleic acid molecules. This segmentation allows for controlled stoichiometry in each partition, ensuring that reagents are efficiently utilized while maintaining high clonal copy numbers through optimized bead-to-template ratios in each segmented unit.
Solution Approach 2:
The patent optimizes the bead-to-nucleic acid molecule ratio as a key parameter, adjusting it to achieve the desired balance between clonal amplification accuracy and reagent consumption. By carefully controlling this parameter along with partition size and reagent concentration, the system achieves high reliability without excessive reagent use.
2Measurement precision
If multiple primer sets are used to generate paired-end sequencing reads, then sequencing accuracy improves, but process complexity increases
Solution Approach 1:
Multiple primer sets are combined in a single amplification reaction within each partition, allowing simultaneous generation of paired-end sequencing reads. This merging of functions reduces the need for separate amplification steps while maintaining high sequencing accuracy through the use of multiple primers targeting different regions of the nucleic acid molecule.
Solution Approach 2:
The amplification system is designed to perform multiple functions simultaneously: clonal amplification, paired-end read generation, and library preparation. By making the primer sets and amplification process multi-functional, the patent reduces overall process complexity while achieving high measurement precision through multiple sequencing reads.
3Ease of operation
If Poisson distribution is used for bead and template loading, then random distribution is achieved, but template loss and noise increase
Solution Approach 1:
The patent applies preliminary action by pre-concentrating nucleic acid molecules onto beads before partitioning, or by using deterministic loading methods to ensure each partition receives the optimal number of templates. This preliminary concentration step prevents template loss and reduces noise by ensuring sufficient signal strength in each partition, while maintaining ease of operation through automated loading protocols.
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 results in higher clonal copy numbers, reduced template loss, and improved sequencing accuracy, with efficient reagent usage and reduced noise, thereby enhancing the quality of nucleic acid analysis.
Implementation Method 1
using the nucleic acid molecule and the one or more reagents to generate one or more amplification products of the nucleic acid molecule
Data Source
AI summary
The present disclosure provides methods and processes for increasing the efficiency and accuracy of nucleic acid sequencing using techniques such as polymerase chain reaction (PCR). The methods described herein can be used to achieve clonal amplification even with a greater than Poisson distribution of beads and/or nucleic acid templates into an emulsion. A PCR method may comprise generating a partition (e.g., a droplet) comprising at least two beads and/or at least two nucleic acid molecules and generating clonal amplification products corresponding to the nucleic acid molecule, at least a subset of which may be attached to a bead.