Polyhedral Substrates for Low-Shear Nucleic Acid Extraction
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Solution Overview
Problem
Existing nucleic acid extraction and purification methods cause significant mechanical shearing of large DNA molecules, leading to reduced yields and integrity of long-read sequencing information.
Innovation Solution
The use of polyhedral, rigid substrates that interact with nucleic acids to isolate them with minimal damage, such as stainless steel star shapes, which reduce shearing by minimizing constriction points during centrifugation and washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nucleic acid extraction methods are used, then nucleic acids can be isolated from biological samples, but significant mechanical shearing occurs to large DNA molecules
Solution Approach 1:
The patent employs spherical magnetic beads as the substrate for nucleic acid binding. The spherical geometry eliminates sharp edges and corners that would otherwise act as stress concentration points during centrifugation and manipulation, thereby preventing mechanical shearing of large DNA molecules while maintaining effective nucleic acid isolation
2Productivity
If rigid substrates with sharp edges are used for nucleic acid binding, then binding efficiency improves, but DNA shearing increases
Solution Approach 1:
The invention replaces rigid substrates with sharp edges with spherical magnetic beads that have smooth, continuous surfaces. This geometric transformation maintains the binding efficiency through sufficient surface area and magnetic responsiveness while eliminating stress concentration points that cause DNA shearing during centrifugation and handling
3Productivity
If conventional extraction methods are used, then nucleic acid isolation can be achieved, but yields of long-read sequencing information are reduced
Solution Approach 1:
The spherical magnetic bead substrate prevents mechanical shearing of large DNA molecules during isolation, thereby preserving the integrity of long-read sequencing information. The smooth spherical geometry eliminates stress concentration points while maintaining efficient nucleic acid binding and isolation yields
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 preserves longer DNA molecules, enhancing the integrity of nucleic acid samples for sequencing, particularly in long-read applications.
Implementation Method 1
contacting the biological sample with a polyhedral, rigid substrate; adsorbing the nucleic acids of the sample to the polyhedral, rigid substrate
Data Source
AI summary
Aspects of the disclosure relate to methods for extracting and/or purifying nucleic acids from biological samples. The disclosure is based, in part, on methods comprising contacting DNA in a sample with a polyhedral, rigid substrate under conditions under which the nucleic acids interact (e.g., adsorb or bind) with the substrate to form aggregates, and eluting isolated or purified DNA from the substrate after washing or other sample processing techniques. In some embodiments, methods described by the disclosure result in less sheared isolated or purified DNA relative to previously employed substrates. The resulting isolated nucleic acids may be used for sequencing, for example ultra-long read DNA sequencing.