Anion Exchange Chromatography for Cell-Free Nucleic Acid Isolation
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Solution Overview
Problem
Current methods for isolating and purifying cell-free nucleic acids from bodily fluids are time-consuming, laborious, and often require hazardous chemicals, and struggle with the isolation of low molecular weight and fragmented nucleic acids due to the need for cell lysis and inefficient silica-based methods.
Innovation Solution
A method using anion exchange chromatography with materials like Q-Sepharose™ for the rapid and efficient separation, isolation, and purification of cell-free DNA or RNA from bodily fluids, which does not require cell lysis and effectively adsorbs both high and low molecular weight nucleic acids, including fragments as short as 10 base pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silica-based methods are used for nucleic acid extraction, then high molecular weight cellular DNA and RNA can be isolated, but low molecular weight and fragmented nucleic acids are lost during purification
Solution Approach 1:
The patent changes the chemical parameters of the extraction medium by using anion exchange materials with specific binding properties that differ from silica-based methods. This allows selective binding of nucleic acids across different molecular weights, preventing loss of low molecular weight fragments while maintaining isolation efficiency for high molecular weight nucleic acids.
Solution Approach 2:
The patent introduces anion exchange materials as an intermediary substance between the nucleic acid sample and the purification process. These materials act as a mediator that can bind and release nucleic acids of various sizes, enabling recovery of fragmented nucleic acids that would otherwise be lost in silica-based extraction.
2Reliability
If phenol deproteinization is performed for cell-free nucleic acid purification, then nucleic acids can be separated from proteins, but the process becomes time-consuming and hazardous
Solution Approach 1:
The patent extracts the hazardous phenol step from the purification process by replacing it with anion exchange chromatography. This removes the harmful substance while maintaining the essential function of separating nucleic acids from proteins, thereby reducing both time and safety risks.
Solution Approach 2:
The patent employs disposable anion exchange cartridges or columns that can be quickly processed and discarded, replacing the time-consuming and hazardous phenol extraction process with a rapid, single-use system that maintains purification quality without requiring lengthy processing or handling of toxic chemicals.
3Quantity of substance
If cell lysis is performed to release nucleic acids, then nucleic acids can be extracted from cells, but the process becomes complex and hazardous due to multiple required steps
Solution Approach 1:
The patent enables the biological sample to serve itself by directly binding nucleic acids to the anion exchange material without requiring external cell lysis steps. The nucleic acids in the sample automatically interact with the anion exchange medium, eliminating the need for complex lysis procedures while maintaining adequate yield.
Solution Approach 2:
The patent segments the purification process into a simple two-step protocol: direct binding of nucleic acids to the anion exchange material, followed by elution. This segmentation removes the complex cell lysis and multiple purification steps, reducing procedural complexity while maintaining nucleic acid recovery.
4Quantity of substance
If large specimen volumes are processed for nucleic acid isolation, then sufficient nucleic acid quantity can be obtained, but phenol deproteinization becomes technically difficult and automation is impossible
Solution Approach 1:
The patent replaces the manual, mechanically intensive phenol deproteinization process with anion exchange chromatography, which can be easily automated using standard liquid handling robots and automated extraction systems. This substitution enables processing of large specimen volumes while maintaining ease of operation and automation capability.
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 method allows for the simultaneous concentration and partial purification of nucleic acids, maintaining their integrity, and enables the isolation of low molecular weight fragments, making it suitable for high-throughput diagnostic analysis and preserving nucleic acids for up to 10 days at room temperature.
Implementation Method 1
a) selecting an anion exchange material which effectively adsorbs said target nucleic acids or proteinous complexes thereof
Data Source
AI summary
This invention provides compositions and methods for rapid separation, isolation and purification of nucleic acids from biological samples using anionic exchange media. The method can utilize commercially available strong or weak anion exchanger materials with selected solutions of known ionic strength for adsorption and elution. The instant method is particularly advantageous as it permits the purification and identification of shorter fragments of nucleic acids from bodily fluids which, until now, had not been identified.