EVA Membrane Microdissection for Precise Nucleic Acid Isolation
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Solution Overview
Problem
Existing microdissection techniques for isolating specific cells or cell populations from histological samples are cumbersome and inefficient, particularly in preserving nucleic acids for analysis, and require expensive or labor-intensive methods like laser capture microdissection or flow cytometry.
Innovation Solution
The use of ethylene vinyl acetate (EVA) membranes, optionally with fullerene moieties, for microdissection, which are thermally treated and solvent-extracted to isolate nucleic acids, allowing for efficient separation and preservation of cellular materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser capture microdissection is used to isolate target cells, then cellular material can be obtained with good specificity, but the process becomes expensive and time-consuming
Solution Approach 1:
The patent changes the physical-chemical parameters of the transfer membrane by incorporating wax or other materials with specific melting points. The membrane is heated to a temperature that melts the wax, causing it to adhere selectively to the target cells. This parameter change enables rapid, automated cell transfer without the time-consuming manual manipulation required by traditional LCM methods.
Solution Approach 2:
The patent replaces the mechanical laser-based adhesion system with a thermal system. Instead of using laser energy to melt and adhere cells, the system uses controlled heating of the entire membrane to a predetermined temperature, allowing wax to melt and adhere to cells. This substitution eliminates the need for expensive laser equipment and reduces processing time.
2Ease of manufacture
If manual dissection is used to isolate cells, then equipment costs are reduced, but the process becomes labor-intensive and less precise
Solution Approach 1:
The patent introduces a transfer membrane with wax as an intermediary between the histological slide and the collection surface. The wax layer selectively adheres to target cells during a brief contact period, enabling precise cell isolation without requiring skilled manual manipulation. This intermediary material provides the precision previously achievable only through expensive automated systems.
Solution Approach 2:
The patent utilizes the phase change parameter of wax (solid to liquid at specific temperatures) to achieve selective cell adhesion. By controlling the heating temperature and duration, the system optimizes wax melting to adhere only to target cells, maintaining high precision while using simple, inexpensive equipment.
3Quantity of substance
If traditional transfer membranes are used, then cellular material can be transferred, but non-targeted material is also transferred reducing analysis quality
Solution Approach 1:
The patent creates local quality differences across the transfer membrane by using wax that melts at specific temperatures. When the membrane is heated, only the wax-contacted regions (where target cells are located) become adhesive. This local adhesion property ensures that only cells in contact with melted wax are transferred, while non-targeted cells remain on the slide, thereby reducing contamination.
4Reliability
If complex multi-step protocols are used for cell isolation, then nucleic acid preservation can be improved, but the process becomes more cumbersome
Solution Approach 1:
The patent performs preliminary action by pre-coating the transfer membrane with wax or other adhesion-promoting materials before cell transfer. This preliminary preparation ensures that when cells are transferred and the membrane is heated, the adhesion mechanism is already in place, eliminating the need for multiple subsequent treatment steps and simplifying the overall protocol while maintaining nucleic acid integrity.
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 significantly reduces non-targeted material by up to 100% and enhances nucleic acid yield, providing a cost-effective and efficient means to obtain in vivo miRNA expression patterns directly from tissues.
Implementation Method 1
Suitably the treatment can provide a phase change of at least a portion of the membrane material
Implementation Method 2
The laser beam focally activates the transfer member to adhere the target cells to it
Data Source
AI summary
Methods and systems for analysis and isolation of tissue and cellular material are provided, including to isolate nucleic acid from a sample.