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- W2005755939 abstract "The influence of the egg and sperm on the conductance changes at fertilization in the sea urchin were investigated through cross-fertilization of two Hawaiian species, Tripneustes gratilla and Pseudoboletia indiana. The current-voltage (I-V) relation, measured in voltage-clamped eggs at intervals over the period 2-16 min following the rise to a positive membrane potential that signals sperm attachment, differs significantly in the two species. The magnitude of the conductance change depends on the species of the fertilizing sperm in both homologous and heterologous crosses. This supports the hypothesis that currents during this period arise from sperm membrane channels incorporated into the egg at sperm-egg fusion. Measurements of conductance during the first 90 sec, which includes the period of the major inward current correlated with cortical granule breakdown and elevation of the fertilization envelope, showed that the magnitude and timing of the maximum current also differed in the two species. This conductance change presumably involves an activation of egg membrane channels initiated by the sperm and would be expected to be characteristic of the egg species. However, in cross-fertilized eggs the magnitude and timing of the conductance change over this period also depends on the species of the sperm with little identifiable egg contribution, indicating that the fertilizing sperm can modulate the egg response to influence these events." @default.
- W2005755939 created "2016-06-24" @default.
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- W2005755939 date "1990-10-01" @default.
- W2005755939 modified "2023-09-24" @default.
- W2005755939 title "Membrane conductance patterns during fertilization are sperm dependent in two sea urchin species" @default.
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- W2005755939 doi "https://doi.org/10.1016/0012-1606(90)90389-z" @default.
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