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MAGNESIUM ION-REQUIRING STEP IN FERTILIZATION OF SEA URCHINS.

Kiyoshi Sano1, Noriko Usui2, Kiyomi Ueki3

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Magnesium ions are essential for sea urchin fertilization post-vitelline layer penetration. Without magnesium, sperm bind but cannot fuse with the egg or activate it, highlighting magnesium

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Area of Science:

  • Reproductive Biology
  • Marine Biology
  • Biochemistry

Background:

  • Sea urchin fertilization involves complex molecular interactions.
  • The role of specific ions like magnesium in fertilization is not fully elucidated.

Purpose of the Study:

  • To investigate the essential role of magnesium ions in the sea urchin fertilization process.
  • To pinpoint the specific stage(s) of fertilization that require magnesium.

Main Methods:

  • Insemination of sea urchin eggs in magnesium-deficient seawater.
  • Observation of sperm-egg binding and fertilization membrane elevation.
  • Assessing fertilization success upon magnesium re-addition at different time points.
  • Utilizing modified eggs (DTT- or pancreatin-treated) to probe magnesium's role.

Main Results:

  • Spermatozoa bind to eggs in magnesium-free seawater but fail to elevate the fertilization membrane.
  • Fertilization is blocked in calcium and magnesium-deficient seawater, but can be rescued by magnesium addition.
  • Spermatozoa retain the ability to penetrate the vitelline layer in magnesium deficiency.
  • Modified eggs fail to fertilize without magnesium, and re-fertilization is inhibited.

Conclusions:

  • External magnesium ions are indispensable for post-vitelline layer penetration events in sea urchin fertilization.
  • Magnesium is crucial for plasma membrane fusion, sperm entry, and egg activation.
  • These findings clarify the specific requirement of magnesium in the later stages of gamete interaction.