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Related Experiment Videos

Ultrastructure of the human egg

A H Sathananthan1

  • 1La Trobe University, Melbourne, National University Hospital, Singapore.

Human Cell
|March 1, 1997
PubMed
Summary

This study details the fine structure of human oocytes using transmission electron microscopy (TEM) over 20 years. It reveals unique features and changes during maturation and aging, crucial for assisted reproduction research.

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Area of Science:

  • Reproductive Biology
  • Cell Biology
  • Human Embryology

Background:

  • Human oocyte structure is critical for successful fertilization and embryonic development.
  • Understanding oocyte ultrastructure aids in improving assisted reproductive technologies (ART).
  • Previous research has provided insights, but a comprehensive TEM-based analysis over an extended period is valuable.

Purpose of the Study:

  • To comprehensively describe the fine structure of the mature human oocyte using TEM.
  • To identify unique features of human oocytes compared to other mammals.
  • To investigate structural changes during oocyte maturation, aging in culture, and spontaneous activation.

Main Methods:

  • Transmission Electron Microscopy (TEM) examination of over 2000 human oocytes.
  • Routine fixation using glutaraldehyde/osmium tetroxide and embedding in araldite.
  • Serial sectioning for detailed ultrastructural analysis.
  • Oocytes recovered after gonadotrophin stimulation and observed during in vitro maturation.

Main Results:

  • Human oocytes possess typical organelles but lack yolk and have rare Golgi, RER, and ribosomes.
  • Unique features include specific smooth endoplasmic reticulum (SER) types, cortical granules, and an anastral metaphase II spindle lacking maternal centrioles.
  • Oocyte aging in culture leads to SER swelling, mitochondrial changes, cortical granule migration, and cytoskeletal disorganization.
  • Differences in structure during peri-ovulatory maturation and spontaneous activation were observed.

Conclusions:

  • The human oocyte exhibits distinct ultrastructural characteristics relevant to ART.
  • Oocyte aging in vitro significantly impacts cellular structures, potentially affecting developmental competence.
  • Detailed knowledge of oocyte fine structure is essential for advancing fertility treatments and understanding reproductive processes.

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