Polymerase Loading Density via Biotin-Avidin Scaffolds
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Solution Overview
Problem
Current methods for single molecule analysis, such as DNA sequencing, face challenges in loading multiple molecules into reaction regions, leading to complications in signal analysis and low throughput due to Poisson-limited loading, where fewer than 37% of array regions are occupied by analyte molecules.
Innovation Solution
The method involves using scaffolds with functional moieties like biotin or avidin attached to DNA molecules to selectively occupy binding sites in array regions, preventing other polymerase molecules from loading, thereby increasing the density of single polymerase molecules in the array regions beyond Poisson distribution limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Poisson-limited loading is used to ensure single molecule occupancy, then multiple molecule loading is avoided, but the throughput and loading density are reduced to fewer than 37% occupied array regions
Solution Approach 1:
The patent applies preliminary action by pre-attaching functional moieties (biotin/avidin) to polymerase molecules before loading them into the array. This pre-functionalization allows the polymerases to selectively bind to specific binding sites in array regions, ensuring single molecule occupancy while enabling much higher loading densities (40-90% occupied regions) compared to traditional Poisson-limited loading (<37% occupied regions).
Solution Approach 2:
The patent uses functional moieties (biotin and avidin) as intermediaries to mediate the binding between polymerase molecules and array regions. The biotin-avidin interaction serves as a specific mediator that enables selective occupancy of binding sites, allowing high-throughput single molecule analysis by ensuring that each occupied array region contains exactly one polymerase molecule while increasing the overall number of occupied regions.
2Ease of manufacture
If random distribution is used to load molecules into array regions, then loading process is simple, but the loading density is limited to Poisson distribution with most regions containing zero or one molecule
Solution Approach 1:
The patent applies preliminary action by pre-functionalizing polymerase molecules with biotin or avidin moieties before the loading step. This pre-preparation enables the subsequent loading process to achieve high density through specific binding interactions, while the actual loading procedure remains relatively simple and does not require complex equipment or procedures.
Solution Approach 2:
The patent changes the chemical parameters of the polymerase molecules by attaching functional moieties (biotin/avidin), which fundamentally alters how they interact with the array. This parameter change transforms the loading mechanism from passive random distribution to active specific binding, enabling loading densities of 40-90% occupied regions compared to the <37% limit of Poisson distribution.
3Quantity of substance
If multiple polymerase molecules are loaded into a single array region, then loading density increases, but signal deconvolution becomes necessary and data quality decreases
Solution Approach 1:
The patent uses biotin-avidin functional moieties as intermediaries to ensure that each polymerase molecule binds to a distinct, specific binding site in the array. This mediating mechanism prevents multiple polymerases from occupying the same array region, thereby maintaining signal analysis accuracy while achieving high loading density through increased numbers of occupied array regions.
Solution Approach 2:
By pre-attaching functional moieties to polymerase molecules, the patent enables them to selectively occupy specific binding sites in array regions. This preliminary functionalization ensures that during high-density loading, each polymerase finds its own unique binding site, preventing co-occupancy of the same region and eliminating the need for signal deconvolution while maintaining measurement precision.
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 enhances the loading density of polymerase molecules, increasing the throughput of single molecule analysis systems and reducing analysis costs by ensuring more than 40-90% of array regions contain a single polymerase molecule, thereby improving data quality and efficiency.
Implementation Method 1
the scaffold comprises a core comprising conjugation adaptors and multiple arms comprising biotin moieties attached to DNA molecules, wherein the exposing is conducted under conditions such that the biotin moieties of the DNA scaffold react with the binding elements of the array regions
Data Source
AI summary
The present invention provides methods, compositions, and systems for distributing single polymerase molecules into array regions. In particular, the methods, compositions, and systems of the present invention result in a distribution of single polymerase molecules into array regions at a percentage that is larger than the percentage expected to be occupied under a Poisson distribution.