Gel-Embedded Sperm DNA Fragmentation Detection
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Solution Overview
Problem
Existing methods for detecting sperm DNA fragmentation, such as comet assay and sperm chromatin dispersion test, are complex, time-consuming, and not suitable for rapid and accurate detection.
Innovation Solution
A method involving embedding a semen sample in a gel with a pore size of 3 to 9 nm, containing acrylamide or alginate, followed by lysis with a solution containing urea and SDS, and subsequent DNA staining to observe halo formation around sperm heads, indicating DNA fragmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If comet assay is used to detect sperm DNA fragmentation, then detection sensitivity is improved, but operation complexity and time consumption increase
Solution Approach 1:
The patent extracts and eliminates the electrophoresis step from the comet assay procedure. By using a gel embedding method that allows direct visualization of DNA fragmentation patterns without requiring electric field application and software analysis, the complex electrophoresis apparatus and computational analysis are removed, retaining only the essential detection capability.
Solution Approach 2:
The patent creates a simplified visual copy of the comet assay result through gel embedding and direct microscopy. Instead of requiring the full electrophoresis process to separate and visualize DNA fragments, the method produces a comparable visual pattern (comet-like structure) through gel matrix interaction, allowing direct observation without complex instrumentation.
2Measurement precision
If sperm chromatin dispersion test is used to detect sperm DNA fragmentation, then detection capability is improved, but determination difficulty increases
Solution Approach 1:
The patent applies local quality by using gel embedding that creates distinct spatial zones around sperm nuclei. The gel matrix provides a structured environment where dispersed DNA fragments naturally form visible patterns with clear boundaries, making the measurement location-specific and unambiguous rather than requiring subjective assessment of diffuse halo widths.
Solution Approach 2:
The patent utilizes DNA staining with fluorescent dyes that produce distinct color/fluorescence patterns. The stained DNA fragments in the gel matrix create visually distinct colored structures that are easily distinguishable from the sperm head, eliminating the difficulty of determining faint halo boundaries through brightness variations alone.
3Measurement precision
If conventional detection methods are used, then detection accuracy is maintained, but time consumption increases
Solution Approach 1:
The patent performs preliminary embedding of sperm cells in the gel matrix before detection. This pre-positioning of cells in the gel structure allows subsequent rapid visualization without requiring time-consuming electrophoresis setup, sample preparation for complex assays, or sequential processing steps, thereby reducing overall detection time while maintaining accuracy.
Solution Approach 2:
The patent skips the time-consuming intermediate steps of conventional methods (electrophoresis run time, multiple washing steps, complex staining protocols). By using gel embedding that enables direct visualization, the method rushes through to the final detection stage, achieving rapid results without sacrificing the essential detection accuracy of conventional approaches.
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 rapid and accurate detection of sperm DNA fragmentation, reducing the complexity and time required compared to conventional methods, while maintaining high accuracy.
Implementation Method 1
embedding a semen sample containing sperm cells in a gel, which has a pore size from 3 to 9 nm
Implementation Method 2
embedding a semen sample containing sperm cells in a gel, which has a pore size from 3 to 9 nm and contains a component selected from the group consisting of acrylamide, acrylic acid, methacrylic acid, N-isopropylacrylamide (NIPAM) and alginate
Implementation Method 3
treating the sperm cells-embedded gel with a lysis solution, to lyse the nuclear proteins of the sperm cells
Implementation Method 4
treating the sperm cells-embedded gel with a lysis solution, to lyse the nuclear proteins of the sperm cells
Implementation Method 5
After DNA staining with a fluorescent dye, the comet-like structure is visualized using a fluorescence microscope
Data Source
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AI summary
Disclosed herein is a method for the detection of the presence of sperm DNA fragmentation in a semen sample. The method comprises a step of embedding the semen sample containing sperm cells in a gel comprising acrylamide, acrylic acid, methacrylic acid, N-isopropylacrylamide (NIPAM), alginate, or polyethylene glycol (PEG), to obtain a sperm cells-embedded gel. A kit for detecting sperm DNA fragmentation in a semen sample is also disclosed.