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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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Sperm selection by rheotaxis improves sperm quality and early embryo development.

Jon Romero-Aguirregomezcorta1, Ricardo Laguna-Barraza2, Raúl Fernández-González2

  • 1Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering, University of Limerick, Limerick, Ireland.

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Summary

Rheotaxis, a microfluidic sperm selection method, improves sperm quality and embryo development compared to traditional techniques. This method enhances motility, morphology, and viability, reducing DNA fragmentation for better reproductive outcomes.

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Area of Science:

  • Reproductive Biology
  • Microfluidics
  • Sperm Selection Techniques

Background:

  • Traditional sperm selection methods like density gradient and swim-up have limitations in improving sperm quality.
  • Assessing sperm DNA integrity is crucial for successful fertilization and embryo development.

Purpose of the Study:

  • To evaluate a novel sperm selection method combining rheotaxis and microfluidics.
  • To compare the efficacy of rheotaxis-based sperm selection against density gradient and swim-up methods.
  • To assess the impact of rheotaxis on sperm parameters and subsequent embryo development.

Main Methods:

  • Human sperm samples (fresh and frozen-thawed) were selected using rheotaxis, density gradient, swim-up, and a control group.
  • Sperm quality was analyzed for motility, morphology, DNA fragmentation index (DFI), viability, acrosome integrity, and membrane fluidity.
  • Fertilization, implantation, and fetal development rates were compared in a mouse model using ICSI with rheotaxis- or swim-up-selected sperm.

Main Results:

  • Rheotaxis selection resulted in significantly reduced DFI, improved normal morphology, and higher total motility compared to other methods.
  • Swim-up improved total motility and reduced DFI in fresh samples.
  • In frozen-thawed samples, rheotaxis yielded higher sperm viability with maintained acrosomal integrity and membrane fluidity.
  • Mouse ICSI using rheotaxis-selected sperm showed increased fertilization, implantation, and fetal development rates compared to swim-up selection.

Conclusions:

  • Rheotaxis is an effective method for selecting high-quality spermatozoa with low DNA fragmentation, high motility, and viability.
  • This technique offers a promising alternative for sperm selection, especially when non-destructive DNA testing is unavailable.
  • Improved sperm selection via rheotaxis leads to enhanced embryo developmental rates.