Long-Read DNA Sample Preparation Without Alcohol Washes
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Solution Overview
Problem
Current methods for preparing DNA samples for nanopore sequencing are inefficient, time-consuming, and require the use of alcohol-containing components that can denature motor proteins, while existing kits are expensive and not suitable for automated processing.
Innovation Solution
A method and kit using polyethylene glycol and a monohydric or multivalent salt to adsorb DNA on rough surfaces without ethanol or isopropanol, followed by Tris buffer washing, enabling fast and efficient extraction and purification of high molecular weight DNA and DNA libraries for nanopore sequencing, suitable for both manual and automated processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alcohol-containing components (isopropanol or ethanol) are used for DNA binding and washing, then DNA purification efficiency is improved, but motor protein is destroyed
Solution Approach 1:
The patent introduces an intermediary substance (polyethylene glycol or spermine) that enables DNA purification without requiring alcohol. This intermediary mediates the binding of DNA to the solid phase, allowing the process to proceed without isopropanol or ethanol, thus preserving the motor protein while achieving efficient DNA purification.
Solution Approach 2:
The patent changes the chemical parameters of the binding buffer by replacing alcohol-based solutions with polyethylene glycol or spermine-based solutions. This parameter change fundamentally alters the purification mechanism to be compatible with motor protein stability, eliminating the need for alcohol while maintaining or improving purification efficiency.
2Productivity
If spermine concentration is increased to improve DNA precipitation, then precipitation efficiency is improved, but sequencing pores may be clogged
Solution Approach 1:
The patent optimizes the spermine concentration parameter to a specific range (0.5-2 mM) that balances precipitation efficiency with pore compatibility. By precisely controlling this parameter, the method achieves effective DNA precipitation while avoiding the harmful effect of pore clogging that occurs at higher concentrations.
Solution Approach 2:
The patent uses a controlled, partial amount of spermine rather than excessive concentrations. This partial action approach provides sufficient precipitation efficiency while avoiding the detrimental effects of high spermine levels, demonstrating the principle of using just enough reagent to achieve the desired effect without overdoing it.
3Speed
If classical purification methods with ethanol or isopropanol are used, then purification speed is improved, but motor protein is destroyed
Solution Approach 1:
The patent replaces the traditional alcohol intermediary with polyethylene glycol or spermine as the binding medium. This new intermediary enables fast purification steps similar to classical methods while being compatible with motor protein stability, thus achieving both speed and reliability.
Solution Approach 2:
The patent substitutes the chemical mechanism of alcohol-based binding with a polyethylene glycol or spermine-based binding mechanism. This substitution maintains the speed and efficiency of classical purification methods while eliminating the harmful chemical effects on motor protein.
4Manufacturing precision
If DNA concentration is decreased to improve precipitation with spermine, then precipitation efficiency is improved, but DNA loss increases
Solution Approach 1:
The patent optimizes multiple parameters simultaneously (spermine concentration, buffer composition, incubation conditions) to achieve efficient precipitation across a broader range of DNA concentrations. This multi-parameter optimization reduces DNA loss while maintaining precipitation efficiency, solving the trade-off between the two.
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
The method allows for rapid sample preparation, achieving high read lengths of up to >300,000 base pairs in under 2 hours, eliminating the need for alcohol and reducing processing time to a fraction of existing methods, while maintaining DNA integrity.
Implementation Method 1
The invention preferably utilizes the possibility of adsorbing DNA on rough or structured surfaces known, inter alia, from the patent specifications
Implementation Method 2
which is preferably magnetic or paramagnetic
Data Source
AI summary
A method and kit may extract high molecular weight DNA from a biological sample and/or purify a DNA library. In the method, after optional lysis of the biological sample and/or after preparation of the DNA library, the mixture is brought into contact with a combination of a polyether, preferably polyethylene glycol, and at least one salt, preferably magnesium chloride, in the absence of monohydric alcohols. Subsequently, the DNA is bound to a solid phase and then the DNA is purified without the use of monohydric alcohols. The method may be performed manually or automatically.