The Cytoskeleton and Polyspermy in Sea Urchin Eggs
At fertilization the sea urchin egg undergoes a dramatic structural reorganization of its surface. Within the first few seconds there is a depolarization of the egg plasma membrane and this is followed by a transient increase in intracellular Ca++. The elevated Ca induces the exocytosis of cortical granules and the resulting fertilization membrane helps make the egg refractory to further insemination.
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- Boveri T (1901) Die Polaritat von Ovocyte, Ei und Larvae des Strongylocentrotus lividus. Zool Jb (Morph) 14: 630–651Google Scholar
- Dale B (1985) Sperm receptivity in sea urchin oocytes and eggs. J Exp Biol 118: 85–97Google Scholar
- Rothschild L, Swann M (1952) The fertilization reaction in the sea urchin. The block to polyspermy. J Exp Biol 29: 469–483Google Scholar
- Runnström J (1961) The mechanism of protection of the eggs against polyspermy. Experiments on the sea urchin Paracentrotus lividus. Ark Zool 13: 565–571Google Scholar
- Shroeder T (1978) Microvilli on sea urchin eggs: A second burst of elongation. Dev Biol 64: 324–346Google Scholar