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Microfluidic sperm trap array for single-cell flagellar analysis with unrestricted 2D flagellar movement.

Kaiyu Wang1, Antai Tao1, Rongjing Zhang1

  • 1Hefei National Research Center for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China. rjzhang@ustc.edu.cn.

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Summary

A new microfluidic device captures sperm without restricting flagellar motion, enabling accurate analysis of sperm motility and behavior for assisted reproductive technologies.

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Area of Science:

  • Reproductive Biology
  • Biotechnology
  • Microfluidics

Background:

  • Sperm immobilization is crucial for long-term analysis and assisted reproductive technologies like intracytoplasmic sperm injection (ICSI).
  • Existing methods often restrict flagellar motion, hindering accurate assessment of natural sperm behavior.
  • There's a need for high-throughput, non-destructive sperm capture techniques that preserve flagellar motility.

Purpose of the Study:

  • To develop a novel microfluidic device for non-destructive sperm capture that allows unimpeded flagellar motion.
  • To investigate the effects of hyperactivating agents and temperature on bovine sperm flagellar dynamics using the developed device.
  • To enable precise, automated analysis of sperm waveform parameters.

Main Methods:

  • Engineered a microfluidic device utilizing sperm's boundary-following behavior for capture.
  • Designed the device to restrain the sperm head while allowing flagellar freedom.
  • Applied the device to study bovine sperm under varying conditions (hyperactivating agents, temperature).

Main Results:

  • The device successfully captured sperm while maintaining natural flagellar beating patterns.
  • Enabled collection of waveform parameters along the entire flagellum, overcoming previous measurement inconsistencies.
  • Facilitated automated analysis of flagellar tracking by preventing imaging overlap.

Conclusions:

  • The novel microfluidic device provides a non-destructive method for sperm capture, crucial for accurate motility analysis.
  • This technology enhances the study of sperm behavior, particularly in response to environmental factors.
  • It offers significant advantages for assisted reproductive technologies and fundamental research on sperm function.