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Fusion with a fertilizing spermatozoon induces the mammalian oocyte to undergo a remarkable series of oscillations in cytosolic Ca(2+), leading to oocyte activation and development of the embryo. The exact molecular mechanism for generating Ca(2+) oscillations has not been established. A sperm-specific zeta isoform of phospholipase C (PLCzeta) has been identified in mice. Mouse PLCzeta triggers Ca(2+) oscillations in mouse oocytes and exhibits properties synonymous with the 'sperm factor' that has been proposed to diffuse into the oocyte after gamete fusion. The present study isolated the PLCzeta homologue from human and cynomolgus monkey testes. Comparison with mouse and monkey PLCzeta protein sequences indicates a shorter X-Y linker region in human PLCzeta and predicts a distinctly different isoelectric point. Microinjection of complementary RNA for both human and cynomolgus monkey PLCzeta elicits Ca(2+) oscillations in mouse oocytes equivalent to those seen during fertilization in mice. Moreover, human PLCzeta elicits mouse egg activation and early embryonic development up to the blastocyst stage, and exhibits greater potency than PLCzeta from monkeys and mice. These results are consistent with the proposal that sperm PLCzeta is the molecular trigger for egg activation during fertilization and that the role and activity of PLCzeta is highly conserved across mammalian species.
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