Intracytoplasmic sperm injection allows fertilization and development of a chromosomally balanced embryo from a binovular zona pellucida

Anat Safran, Benjamin E. Reubinoff, Anat Porat-Katz, Marion Werner, Shevach Friedler, Aby Lewin

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

A binovular zona pellucida was found in two in-vitro fertilization (IVF) treatment cycles. In both cases, two oocytes of slightly unequal size were enclosed within a single zona pellucida, the larger oocyte appearing as a metaphase II oocyte while the smaller one as an immature oocyte with a germinal vesicle. Intracytoplasmic sperm injection performed in the mature oocyte of each pair led to normal fertilization and embryonic development in both cases. Results of genetic analysis performed by fluorescence in-situ hybridization in one of the two treatment cycles were consistent with a diploid chromosomal status of both the non-injected immature oocyte as well as the embryo which developed following the microinjection. These results indicate that, in this case, the binovular zona pellucida was most probably created when granulosa cells failed to separate two distinct oocytes during follicular formation. It may also imply that selective fertilization of a single mature oocyte in a binovular zona pellucida by intracytoplasmic sperm injection can lead to the development of a chromosomally balanced embryo and can prevent the undesired consequences that may result if the two oocytes are fertilized in the course of standard IVF.

Original languageEnglish
Pages (from-to)2575-2578
Number of pages4
JournalHuman Reproduction
Volume13
Issue number9
DOIs
StatePublished - 1 Jan 1998
Externally publishedYes

Keywords

  • Binovular zona pellucida
  • Fluorescence in-situ hybridization
  • Intracytoplasmic sperm injection

ASJC Scopus subject areas

  • Reproductive Medicine
  • Obstetrics and Gynecology

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