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High-throughput analysis of horse sperms' 3D swimming patterns using computational on-chip imaging
Ting-Wei Su1, Inkyum Choi2, Jiawen Feng2
1Electrical Engineering Department, University of California, Los Angeles, CA 90095, USA; Bioengineering Department, University of California, Los Angeles, CA 90095, USA.
Animal Reproduction Science
|February 1, 2016
Summary
Researchers analyzed horse sperm swimming patterns using advanced 3D tracking. Irregular, planar, and ribbon trajectories dominate, with seminal plasma influencing sperm straightness and movement patterns.
Area of Science:
- Reproductive Biology
- Biophysics
- Animal Science
Background:
- Understanding sperm motility is crucial for reproductive success.
- Previous studies often focused on 2D sperm dynamics, limiting insights into complex 3D swimming behaviors.
Purpose of the Study:
- To comprehensively analyze the three-dimensional (3D) swimming dynamics of horse sperm.
- To statistically categorize and quantify diverse sperm motility patterns.
- To investigate the influence of seminal plasma on sperm trajectory characteristics.
Main Methods:
- Employed a high-throughput, dual-color, dual-angle lensfree imaging platform based on partially-coherent digital in-line holography.
- Tracked individual 3D trajectories of approximately 1000 horse sperm per sample at sub-micron resolution and 143 frames per second.
- Collected and analyzed over 17,000 sperm trajectories for statistical assessment of swimming behavior.
Main Results:
- Identified six major 3D swimming patterns: irregular, linear, planar, helical, ribbon, and hyperactivated (with four sub-categories).
- Found that irregular, planar, and ribbon trajectories constitute over 97% of observed patterns in plasma-free medium.
- Demonstrated that seminal plasma enhances sperm straightness, increasing linear patterns and decreasing planar patterns, with minimal effect on ribbon patterns.
Conclusions:
- Horse sperm exhibit complex 3D swimming dynamics dominated by irregular, planar, and ribbon trajectories.
- Seminal plasma plays a significant role in modulating sperm motility, promoting straighter paths.
- The high-throughput holographic technique provides unprecedented statistical power for analyzing sperm dynamics.
