Micromanipulation of cleaved embryos cultured in protein-free medium: A mouse model for assisted hatching

Authors

  • Mina Alikani,

    Corresponding author
    1. Gamete and Embryo Research Laboratory, Cornell University Medical Center, New York, New York 10021
    • Center for Reproductive Medicine, Department of Obstetrics and Gynecology, New York Hospital-Cornell Medical Center, 505 East 70 Street, HT-330, New York, NY 10021
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  • Jacques Cohen

    1. Gamete and Embryo Research Laboratory, Cornell University Medical Center, New York, New York 10021
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Abstract

A mouse model for studying anomalies of human embryonic hatching following micromanipulation is proposed. Initiation and completion of mouse blastocyst hatching was severely impaired (34/292; 12% and 28/292; 10%, respectively) with protein deprivation, resembling the situation in human in vitro fertilization. Hatching ability was restored when an artificial gap was introduced in the zona pellucida by micromanipulation at the cleaved embryo stage. This enabled 77% (285/371) and 36% (134/371) of the embryos to initiate and complete hatching in protein-free medium. No differences were found in overall cell counts between the two groups of embryos. Transfer of micromanipulated blastocysts to pseudopregnant females resulted in development of healthy fetuses. © 1992 Wiley-Liss, Inc.

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