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PLC zeta: a sperm-specific trigger of Ca(2+) oscillations in eggs and embryo development

Saunders, Christopher Matthew, Larman, Mark Graham, Parrington, John, Cox, Llewellyn J., Royse, Jillian, Blayney, Lynda Mary, Swann, Karl and Lai, Francis Anthony 2002. PLC zeta: a sperm-specific trigger of Ca(2+) oscillations in eggs and embryo development. Development 129 (15) , pp. 3533-3544.

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Upon fertilisation by sperm, mammalian eggs are activated by a series of intracellular Ca2+ oscillations that are essential for embryo development. The mechanism by which sperm induces this complex signalling phenomenon is unknown. One proposal is that the sperm introduces an exclusive cytosolic factor into the egg that elicits serial Ca2+ release. The ‘sperm factor’ hypothesis has not been ratified because a sperm-specific protein that generates repetitive Ca2+ transients and egg activation has not been found. We identify a novel, sperm-specific phospholipase C, PLCζ, that triggers Ca2+ oscillations in mouse eggs indistinguishable from those at fertilisation. PLCζ removal from sperm extracts abolishes Ca2+ release in eggs. Moreover, the PLCζ content of a single sperm was sufficient to produce Ca2+ oscillations as well as normal embryo development to blastocyst. Our results are consistent with sperm PLCζ as the molecular trigger for development of a fertilised egg into an embryo.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Uncontrolled Keywords: Fertilisation ; Sperm factor ; Phospholipase C ; Ca2+ oscillations ; Egg activation ; Mouse
ISSN: 0950-1991
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Last Modified: 27 Mar 2020 02:38

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