Integrated Slide Holder for Comet Assay Automation
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Solution Overview
Problem
Conventional comet assays require large volumes of environmentally unfriendly lysing and electrophoresis solutions, and involve multiple handling steps that can damage cells and hinder automated processing.
Innovation Solution
A slide holder assembly that allows all phases of the comet assay, including imaging, to be performed with the slide remaining in a common holder, minimizing solution usage and movement, using a miniature electrophoresis chamber and automated handling for reduced reagent volumes and improved handling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional comet assay procedures are used with separate containers for each step, then the assay can be performed with standard protocols, but large volumes of hazardous solutions are required and multiple handling steps damage cells
Solution Approach 1:
The patent combines multiple separate containers (lysis container, electrophoresis chamber, staining container) into a single integrated slide holder assembly. The slide holder includes a slide receiving portion, lysis well, electrophoresis chamber, and staining well all in one unit, allowing the slide to remain in the same holder throughout the entire assay process. This eliminates the need to transfer the slide between containers and reduces solution volumes from liters to milliliters.
Solution Approach 2:
The patent implements a nested structure where the electrophoresis chamber is positioned within the lysis well, and the staining well is integrated into the same holder. The slide holder assembly contains multiple functional chambers nested within each other, allowing sequential operations without removing the slide from the holder. The electrophoresis chamber sits within the lysis well area, and the staining well is part of the same integrated structure.
2Ease of operation
If slides are transferred between different containers during the assay, then each step can be performed in optimized conditions, but cell damage increases and automated handling becomes difficult
Solution Approach 1:
The patent combines multiple separate containers (lysis container, electrophoresis chamber, staining container) into a single integrated slide holder assembly. The slide holder includes a slide receiving portion, lysis well, electrophoresis chamber, and staining well all in one unit, allowing the slide to remain in the same holder throughout the entire assay process. This eliminates the need to transfer the slide between containers and reduces solution volumes from liters to milliliters.
Solution Approach 2:
The slide holder assembly serves multiple functions: it holds the slide during cell encapsulation, provides the lysis environment, contains the electrophoresis chamber, and offers the staining well. This multi-functional design allows a single device to perform all assay steps, making it compatible with automated handling systems and eliminating the need for multiple specialized containers.
3Object-affected harmful factors
If large volumes of lysing reagent and electrophoresis buffer are used, then complete coverage of the slide is achieved, but environmental harm increases and disposal becomes problematic
Solution Approach 1:
The patent combines multiple separate containers (lysis container, electrophoresis chamber, staining container) into a single integrated slide holder assembly. The slide holder includes a slide receiving portion, lysis well, electrophoresis chamber, and staining well all in one unit, allowing the slide to remain in the same holder throughout the entire assay process. This eliminates the need to transfer the slide between containers and reduces solution volumes from liters to milliliters.
Solution Approach 2:
The patent applies local quality by providing solution coverage only where needed - in the specific wells and chambers of the slide holder assembly. The lysis reagent is contained in the lysis well, the electrophoresis buffer in the electrophoresis chamber, and the staining solution in the staining well. This localized approach ensures adequate coverage of the slide areas requiring treatment while minimizing overall solution volumes from liter-scale to milliliter-scale.
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
Significantly reduces the volume of hazardous solutions needed, minimizes cell handling, and enables automated high-throughput screening by keeping the slide in a single assembly throughout the assay process, enhancing environmental sustainability and assay efficiency.
Implementation Method 1
electrophoresis of the layered nucleoids
Implementation Method 2
When an electric field is applied across the DNA, which has an overall negative charge, the DNA is drawn towards the anode, which is positively charged
Implementation Method 3
encapsulation of cells in a low-melting-point agarose (LMA) suspension
Implementation Method 4
staining of DNA and calculating fluorescence to determine the extent of DNA damage
Data Source
AI summary
A slide holder assembly and method for use in high content screening of a comet assay. The slide holder assembly has an inside surface and is configured to receive a slide holding a plurality of biological cells on a top surface thereof. When the slide is secured within the slide holder assembly, the inside surface of the slide holder assembly and the top surface of the slide combine to form a cavity having an open top end. The cavity is watertight and configured to hold a liquid therein. A method of performing a comet assay using a slide disposed within a slide holder assembly. The method includes performing encapsulation, lysis, electrophoresis, staining, and imaging of cells on the slide while the slide remains secured within the slide holder assembly.