Egg CD9 protein tides correlated with sperm oscillations tune the gamete fusion ability in mammal.

Abstract:

:Mammalian fertilization involves membrane events-adhesion, fusion, sperm engulfment, membrane block to polyspermy-whose causes remain largely unknown. Recently, specific oscillations of the sperm in contact with the egg were shown to be necessary for fusion. Using a microfluidic chip to impose the venue for the encounter of two gametes allowed real-time observation of the membrane remodelling occurring at the sperm/egg interface. The spatiotemporal mapping of egg CD9 revealed that this protein concentrates at the egg/sperm interface as a result of sperm oscillations, until a CD9-rich platform is nucleated on which fusion immediately takes place. Within 2-5 min after fusion, most of the CD9 leaves the egg for the external aqueous medium. Then an egg membrane wave engulfs the sperm head in ~25 min. These results show that sperm oscillations initiate the CD9 recruitment that causes gamete fusion after which CD9 and associated proteins leave the membrane in a process likely to contribute to block polyspermy. They highlight that the gamete fusion story in mammals is an unexpected interplay between mechanical constraints and proteins.

journal_name

J Mol Cell Biol

authors

Ravaux B,Favier S,Perez E,Gourier C

doi

10.1093/jmcb/mjy005

subject

Has Abstract

pub_date

2018-12-01 00:00:00

pages

494-502

issue

6

eissn

1674-2788

issn

1759-4685

pii

4821298

journal_volume

10

pub_type

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