Silicon Carbide Nucleic Acid Size Selection
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Solution Overview
Problem
Current methods for preparing sequencing libraries, particularly for next-generation sequencing, face challenges in efficiently separating desired nucleic acid sequences from contaminants like adapter monomers and adapter-adapter ligation products, which can reduce usable read numbers and affect library quantification and sequencing accuracy.
Innovation Solution
A method and kit using silicon carbide (SiC) for size-selective isolation of nucleic acids, where nucleic acids above a desired cut-off size bind to SiC in a binding mixture with alcohol, allowing for the separation and elution of targeted nucleic acids, thereby removing contaminants based on size differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel purification is used to remove adapter monomers and adapter-adapter ligation products, then purification effectiveness is improved, but preparation time increases extensively (sometimes overnight)
Solution Approach 1:
The patent changes the binding parameter from traditional silica-based mechanisms to silicon carbide surface properties, enabling size-selective binding where larger nucleic acids bind preferentially. By adjusting binding buffer composition and incubation conditions, the method achieves rapid purification without lengthy gel electrophoresis steps, resolving the time-effectiveness contradiction
Solution Approach 2:
The patent replaces the mechanical gel electrophoresis system with a chemical binding system using silicon carbide particles. Instead of separating molecules through physical migration in a gel matrix under electric field, the method uses selective adsorption based on size-dependent binding affinity, dramatically reducing preparation time while maintaining purification effectiveness
2Reliability
If traditional purification systems are used to remove small nucleic acid contaminants, then some purification is achieved, but small size differences at low molecular weight range cannot be resolved
Solution Approach 1:
The patent applies local quality by creating size-dependent binding affinity on the silicon carbide surface. Larger nucleic acids have greater surface contact area and stronger binding, while smaller contaminants bind weakly or not at all. This localized binding strength variation based on molecular size enables precise resolution of small size differences that traditional systems cannot distinguish
Solution Approach 2:
The patent uses silicon carbide, a composite material with unique surface properties that enable size-selective binding. The combination of silicon and carbon atoms creates a surface with specific chemical and physical characteristics that preferentially interact with larger nucleic acid structures, providing resolution precision unmatched by traditional single-material purification systems
3Productivity
If adapter monomers and adapter-adapter ligation products are not removed, then library preparation is faster, but usable read number is drastically reduced and sequencing accuracy is affected
Solution Approach 1:
The patent performs preliminary purification by removing adapter monomers and adapter-adapter ligation products before library amplification and sequencing. By eliminating contaminants early in the workflow, the method prevents them from being incorporated into the final library, ensuring high sequencing accuracy without requiring time-consuming post-amplification cleanup steps
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 purity of sequencing libraries by efficiently removing adapter monomers and adapter-adapter ligation products, improving library preparation time and accuracy, and increasing the incorporation of desired nucleic acids like microRNAs into sequencing libraries.
Implementation Method 1
combining the sample with a binding buffer, alcohol and silicon carbide to provide a binding mixture, wherein the nucleic acids having a size above the cut-off size bind to the silicon carbide
Data Source
AI summary
Disclosed are methods and kits for isolating nucleic acids having a size above a desired cut-off size from a nucleic acid containing sample. The method comprises combining the sample with a binding buffer, alcohol and silicon carbide to provide a binding mixture. Nucleic acids having a size above the desired cut-off size are selectively bound to the silicon carbide. The cut-off size for selective binding to the silicon carbide is determined by the alcohol concentration of the binding mixture. The bound nucleic acids are separated from the remaining sample. The bound nucleic acids are optionally washed and then eluted from the silicon carbide. The kit comprises a buffer binding to be diluted with alcohol to provide an alcohol concentration of about 1 to about 50% (v/v), a wash solution, an elution solution, silicon carbide and instructions for adjusting the alcohol concentration to selectively bind nucleic acids having a size above the desired cut-off size.