Two pathways regulate cortical granule translocation to prevent polyspermy in mouse oocytes.

Abstract:

:An egg must be fertilized by a single sperm only. To prevent polyspermy, the zona pellucida, a structure that surrounds mammalian eggs, becomes impermeable upon fertilization, preventing the entry of further sperm. The structural changes in the zona upon fertilization are driven by the exocytosis of cortical granules. These translocate from the oocyte's centre to the plasma membrane during meiosis. However, very little is known about the mechanism of cortical granule translocation. Here we investigate cortical granule transport and dynamics in live mammalian oocytes by using Rab27a as a marker. We show that two separate mechanisms drive their transport: myosin Va-dependent movement along actin filaments, and an unexpected vesicle hitchhiking mechanism by which cortical granules bind to Rab11a vesicles powered by myosin Vb. Inhibiting cortical granule translocation severely impaired the block to sperm entry, suggesting that translocation defects could contribute to miscarriages that are caused by polyspermy.

journal_name

Nat Commun

journal_title

Nature communications

authors

Cheeseman LP,Boulanger J,Bond LM,Schuh M

doi

10.1038/ncomms13726

subject

Has Abstract

pub_date

2016-12-19 00:00:00

pages

13726

issn

2041-1723

pii

ncomms13726

journal_volume

7

pub_type

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