Sources of calcium in sea urchin eggs during the fertilization response
Article Abstract:
The Ca2+ transient occurring during fertilization and parthenogenetic activation through microinjection of the Ca2+ release agonists InsP3, cADPR and ryanodine was studied using confocal laser scanning microscopy. Following fertilization, a sudden increase in Ca2+ localized to the egg cortex was detected. This was followed by a distinctive delay prior to the Ca2+ wave onset. It appeared that Ca2+ release mechanisms are essential to the generation of the Ca2+ wave during fertilization. InsP3 and cADPR injections enhanced pronucleus-associated Ca2+ release.
Publication Name: Developmental Biology
Subject: Biological sciences
ISSN: 0012-1606
Year: 1993
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The SpEGF III gene encodes a member of the fibropellins: EGF repeat-containingproteins that form the apical lamina of the sea urchin embryo
Article Abstract:
Researchers discovered a gene in the sea urchin Strongylocentrotus purpuratus that encodes a protein with multiple epidermal growth factor (EGF)-like patterns. The SpEGF III DNA sequence predicts a 570 amino acid protein with a complex domain structure similar to that of fibropellins, which are protein products of the SpEGF I gene. The timing of the accumulation of SpEGF III protein coincides with a rise in the structural complexity of the apical lamina, and with the developmental period when the lamina is crucial to gastrulation.
Publication Name: Developmental Biology
Subject: Biological sciences
ISSN: 0012-1606
Year: 1993
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The molecular basis of sea urchin gamete interactions at the egg plasma membrane
Article Abstract:
Researchers have identified the structure and role of the sea urchin egg plasma membrane receptor for sperm. They proved that an egg cell surface receptor interacted with sperm through the protein binding that is exposed on the edge of the sperm acrosomal mechanisms. The egg receptor for sperm is a unique cell recognition molecule that particularly binds sperm species.
Publication Name: Developmental Biology
Subject: Biological sciences
ISSN: 0012-1606
Year: 1993
User Contributions:
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