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Title: Zinc sparks induce physiochemical changes in the egg zona pellucida that prevent polyspermy

Journal Article · · Integrative Biology
DOI: https://doi.org/10.1039/C6IB00212A · OSTI ID:1369059
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [2];  [2];  [3];  [3];  [4];  [1]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Northwestern Univ., Evanston, IL (United States); Northwestern Univ. Atomic and Nanoscale Characterization Experimental Center, Evanston, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Northwestern Univ., Evanston, IL (United States); Northwestern Univ., Chicago, IL (United States)

During fertilization or chemically-induced egg activation, the mouse egg releases billions of zinc atoms in brief bursts known as ‘zinc sparks.’ The zona pellucida (ZP), a glycoprotein matrix surrounding the egg, is the first structure zinc ions encounter as they diffuse away from the plasma membrane. Following fertilization, the ZP undergoes changes described as ‘hardening’, which prevent multiple sperm from fertilizing the egg and thereby establish a block to polyspermy. A major event in zona hardening is cleavage of ZP2 proteins by ovastacin; however, the overall physiochemical changes contributing to zona hardening are not well understood. Using x-ray fluorescence microscopy, transmission and scanning electron microscopy, and biological function assays, we tested the hypothesis that zinc release contributes to ZP hardening. We found that the zinc content in the ZP increases by 300% following activation and that zinc exposure modulates the architecture of the ZP matrix. Importantly, zinc-induced structural changes of the ZP have a direct biological consequence; namely, they reduce the ability of sperm to bind to the ZP. These results provide a paradigm-shifting model in which fertilization-induced zinc sparks contribute to the polyspermy block by altering conformations of the ZP matrix. Finally, this adds a previously unrecognized factor, namely zinc, to the process of ZP hardening.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Chicago Biomedical Consortium; National Institutes of Health (NIH); National Science Foundation (NSF); USDOE; W.M. Keck Foundation
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1369059
Journal Information:
Integrative Biology, Journal Name: Integrative Biology Journal Issue: 2 Vol. 9; ISSN IBNIEK; ISSN 1757-9694
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

Strategic Advances in Formation of Cell-in-Shell Structures: From Syntheses to Applications journal February 2018
Disruption of O ‐GlcNAc homeostasis during mammalian oocyte meiotic maturation impacts fertilization journal February 2019
Mammalian egg coat modifications and the block to polyspermy journal March 2020
Perfect date—the review of current research into molecular bases of mammalian fertilization journal January 2020
Zinc ion flux during mammalian sperm capacitation journal May 2018
Molecular basis of egg coat cross-linking sheds light on ZP1-associated female infertility journal July 2019
Sperm chemorepulsion, a supplementary mechanism to regulate fertilization journal June 2017
Molecular basis of egg coat cross-linking sheds light on ZP1-associated female infertility journal March 2019
The molecular mechanisms mediating mammalian fertilization journal August 2019
Zinc: A Necessary Ion for Mammalian Sperm Fertilization Competency journal January 2018
Zinc in Cellular Regulation: The Nature and Significance of “Zinc Signals” journal October 2017
Zinc: A Necessary Ion for Mammalian Sperm Fertilization Competency journal December 2018

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