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Related Experiment Videos

Micromanipulation of gametes using laser microbeams.

Y Tadir1, W H Wright, O Vafa

  • 1Beckman Laser Institute, University of California, Irvine 92715.

Human Reproduction (Oxford, England)
|August 1, 1991
PubMed
Summary

Laser non-touch techniques enable precise cellular microsurgery. This advanced optical technology allows for sperm manipulation, intracellular force measurement, and improved fertilization rates by targeting oocytes and removing extra pronuclei.

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Area of Science:

  • Biotechnology
  • Cellular Biology
  • Microscopy

Background:

  • Microsurgical procedures traditionally require physical contact, posing risks to delicate cellular structures.
  • Advancements in laser technology offer non-contact manipulation capabilities at cellular and subcellular levels.

Purpose of the Study:

  • To review and present various laser-based microsurgical techniques for cellular and subcellular manipulation.
  • To explore the application of laser optical traps for assessing sperm function and measuring intracellular forces.
  • To evaluate laser-induced zona pellucida modifications for enhancing fertilization rates and intracellular procedures like pronuclei removal.

Main Methods:

  • Utilizing laser beams with varying wavelengths (14 ns to continuous wave) directed via microscopes.

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  • Employing laser-generated optical traps for micromanipulation of human spermatozoa.
  • Applying specific laser configurations for zona pellucida modification and pronuclei destruction in oocytes.

    • Main Results:

    • Laser optical traps successfully manipulated spermatozoa, allowing assessment of motility and force generation.
    • Intracellular forces were measured non-invasively, and chromosome movement during cell division was induced.
    • Minimal superficial damage to oocyte zona pellucida was achieved, with potential for increased fertilization rates.
    • Destruction of extra pronuclei in polyspermic human oocytes was demonstrated.

    Conclusions:

    • Laser non-touch techniques offer precise and minimally invasive methods for cellular and subcellular microsurgery.
    • Optical traps provide novel tools for studying sperm function and measuring intracellular biomechanics.
    • Laser applications show promise in improving assisted reproductive technologies, particularly for low-quality spermatozoa and polyspermic oocytes.
    • Development of simpler, more accessible laser devices is warranted to facilitate wider adoption of this technology.