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Human Reproduction, Vol 12, 2762-2765, Copyright © 1997 by Oxford University Press

ARTICLES

Origin of tripronucleate zygotes after intracytoplasmic sperm injection

M Grossmann, JM Calafell, N Brandy, JA Vanrell, C Rubio, A Pellicer, J Egozcue, F Vidal and J Santalo
Unitat de Biologia Celular, Facultat de Ciencies, Universitat Autonoma de Barcelona, Bellaterra, Spain.

Zygotes morphologically classified as tripronuclear (3PN) after intracytoplasmic sperm injection (ICSI), which are thought to be digynic in their origin, were studied by fluorescent in-situ hybridization (FISH). FISH results allowed us to assess the suspected ploidy after morphological evaluation of the zygote and to determine the origin of the third pronuclei. Our results show that, firstly, 36% of those zygotes classified as 3PN following their morphological evaluation were, in fact, diploid, and secondly, the main cause for triploidy after ICSI is the non-extrusion of the second polar body.
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