Sperm DNA Fragmentation Detection via Light Scattering
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Solution Overview
Problem
Current methods for evaluating DNA fragmentation in sperm cells are inadequate for live sperm selection in IVF and ICSI procedures, as they require cell killing and do not effectively assess the fertility potential based on DNA integrity.
Innovation Solution
A method using quantitative phase microscopy to determine the fertility potential of sperm cells by correlating physio-spatial parameters with DNA fragmentation levels, allowing for the classification of sperm cells without staining, enabling on-line selection for fertility procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional DNA fragmentation evaluation methods (TUNEL, Comet, SCD, AO) are used, then DNA fragmentation can be detected, but the sperm cells are killed and cannot be used for ICSI
Solution Approach 1:
The patent replaces chemical staining methods with optical scattering measurement. Instead of using dyes and chemical reactions to detect DNA fragmentation, the system uses light scattering properties of intact sperm cells to infer chromatin structure and DNA integrity, thereby avoiding cell killing while maintaining detection capability
Solution Approach 2:
The patent introduces light scattering as an intermediary measurement method. Rather than directly observing DNA or using chemical markers that kill cells, the system measures how light scatters off the sperm cell's chromatin structure, which correlates with DNA fragmentation status without requiring cell lysis or staining
2Ease of operation
If low-magnification bright-field microscopy is used for sperm selection, then the selection process is simple, but only basic morphological characteristics can be observed
Solution Approach 1:
The patent changes the measurement parameter from basic bright-field transmission to light scattering intensity and pattern. This allows the same simple microscopy setup to reveal additional morphological information about chromatin structure and DNA integrity without requiring complex staining procedures or higher magnification
3Measurement precision
If high-magnification IMSI with DIC is used, then detailed morphological characteristics can be observed, but the system is complex and time-consuming
Solution Approach 1:
The patent makes the light scattering measurement method universal by showing that it can detect multiple sperm quality parameters (chromatin structure, DNA fragmentation, morphological features) simultaneously using a single measurement approach, eliminating the need for multiple specialized microscopy systems and staining protocols
4Measurement precision
If staining methods are used to evaluate DNA fragmentation, then detection accuracy is improved, but the sperm cells are destroyed and cannot be used for fertilization
Solution Approach 1:
The patent substitutes chemical staining mechanisms with physical light scattering measurement. The chromatin structure's effect on light scattering provides information about DNA fragmentation without requiring chemical agents that would damage or kill the sperm cell
Solution Approach 2:
The patent creates an optical copy or proxy measurement of DNA fragmentation status through light scattering patterns. Instead of directly visualizing or chemically marking the DNA, the system measures the optical signature that the chromatin structure imprints on scattered light, which correlates with DNA 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
Enables the determination of DNA fragmentation levels and fertility potential of live sperm cells, improving the selection process for IVF and ICSI by providing a non-destructive, label-free assessment of sperm cells, enhancing the chances of successful fertilization.
Implementation Method 1
quantitative phase microscopy to determine the fertility potential of sperm cells by correlating physio-spatial parameters with DNA fragmentation levels
Data Source
AI summary
Methods and systems for evaluating fertility potential of a living sperm cell are presented and involve providing a predetermined classification function correlating between one or more physio spatial parameters of sperm cells and DNA fragmentation distribution in sperm cells, providing data indicative of the one or more physio spatial parameters of the living sperm cell, and applying the classification function to the one or more physio spatial parameters of the living sperm cell to thereby determine a DNA fragmentation level, inside the DNA fragmentation distribution, in the living sperm cell, the DNA fragmentation level being indicative of the fertility potential of the living sperm cell.