Sperm DNA Fragmentation Detection via Gel Embedding and Lysis
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Solution Overview
Problem
Conventional methods for detecting sperm DNA fragmentation, such as the comet assay and sperm chromatin dispersion test, are complex, time-consuming, and difficult to operate, failing to meet the needs for rapid and accurate detection in fertility testing and assisted reproductive techniques.
Innovation Solution
A method involving embedding a semen sample in a gel with specific components like acrylamide or polyethylene glycol, treating it with a lysis solution to lyse nuclear proteins, and observing halo formation after DNA staining to indicate DNA fragmentation, which is simpler and faster than existing methods.
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 operational complexity and time consumption increase
Solution Approach 1:
The patent extracts and eliminates the electrophoresis step from the comet assay procedure. By using a modified halo assay that relies on chemical denaturation and dispersion in agarose gel without requiring electric field application, the method removes the most complex and time-consuming equipment-based step while preserving DNA fragmentation detection capability through alternative chemical means
Solution Approach 2:
The patent replaces the mechanical/electrical electrophoresis system with a chemical system. Instead of using electric fields to separate DNA fragments, the method employs chemical denaturation agents and dispersion mechanisms in agarose gel to achieve DNA fragmentation visualization, thereby eliminating complex electrical equipment and simplifying the operational procedure
2Measurement precision
If sperm chromatin dispersion test is used to detect sperm DNA fragmentation, then detection accuracy is improved, but determination difficulty increases
Solution Approach 1:
The patent employs fluorescent staining that produces distinct color/fluorescence intensity changes between intact and fragmented DNA. The stained DNA loops emit different fluorescence intensities or patterns that are easily distinguishable, replacing the subjective visual assessment of halo width with objective fluorescence signal interpretation, thereby maintaining detection accuracy while eliminating determination difficulty
Solution Approach 2:
The patent uses fluorescent staining to create a visual copy or representation of the DNA fragmentation state. The fluorescence signal serves as a readable copy of the molecular fragmentation condition, allowing direct observation and quantification without requiring complex measurements of physical dimensions like halo width, thus simplifying the detection process while preserving accuracy
3Measurement precision
If conventional SDF detection methods are used, then detection thoroughness is improved, but time consumption increases
Solution Approach 1:
The patent performs preliminary chemical denaturation and gel embedding steps that prepare the sample in advance for direct observation. By pre-denaturing the DNA and embedding it in agarose gel with fluorescent staining before the actual detection step, the method eliminates time-consuming post-processing steps like electrophoresis running and complex image analysis, achieving thorough detection in reduced time
Solution Approach 2:
The patent skips the intermediate electrophoresis step entirely, rushing directly from sample embedding to detection. By eliminating the time-consuming electrical separation process and moving straight to chemical denaturation and fluorescent visualization, the method maintains detection thoroughness while significantly reducing the overall analysis time through strategic process elimination
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 allows for rapid and accurate detection of sperm DNA fragmentation, reducing the complexity and time required for analysis, and provides a kit for effective SDF detection with improved operational ease compared to conventional tests.
Implementation Method 1
embedding a semen sample containing sperm cells in a gel, which has a pore size... The gel has a pore size that allows DNA loops of fragmented sperm DNA to escape from the gel pores while preventing DNA loops of intact sperm DNA from escaping
Implementation Method 2
treating the sperm cells-embedded gel with a lysis solution, to lyse the nuclear proteins of the sperm cells
Implementation Method 3
DNA staining with a fluorescent dye, the comet-like structure is visualized using a fluorescence microscope
Data Source
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.