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Echinobase
ECB-ART-36942
Zygote 1998 Feb 01;61:11-5. doi: 10.1017/s0967199400005037.
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Non-specific currents at fertilisation in sea urchin oocytes.

De Simone ML , Grumetto L , Tosti E , Wilding M , Dale B .


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Using the whole-cell voltage-clamp technique to clamp sea urchin oocytes we show that the fertilising spermatozoon triggers an inward current of -521 +/- 56.7 pA (n = 8) at activation. Simultaneously, the plasma membrane depolarises and the conductance increases from 23.4 +/- 1.4 to 40.6 +/- 1.2 nS (n = 8). The I/V curve for the peak activation current is linear and the current reverses between 0 and +20 mV, suggesting a non-specific ion current. Since injection of inositol triphosphate induced an inward current of -1062 +/- 314 pA (n = 4), and the current was inhibited by preloading oocytes with the calcium chelator BAPTA, the non-specific activation current in sea urchin appears to be calcium dependent.

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Genes referenced: LOC100887844 LOC115919910