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Human Reproduction, Vol 12, 1059-1061, Copyright © 1997 by Oxford University Press

ARTICLES

Triploidy caused by endoreduplication in a human zygote obtained after in-vitro fertilization

B Rosenbusch, M Schneider and K Sterzik
Department of Gynaecology and Obstetrics, University of Ulm, Germany.

Cytogenetic analysis of a presumably tripronuclear zygote revealed that triploidy was caused by an endoreduplicated 46,XX complement. The remaining chromosomes yielded a hyperhaploid karyotype of 28,Y, +2, +3C, +D. The origin of this chromosomal composition is obscure. Besides endoreduplication in a normal 23,X oocyte pronucleus and fertilization by a normal 23,Y spermatozoon, an additional female pronucleus might have been formed due to an irregular chromosome distribution during second meiotic division. On the other hand, penetration by a hyperhaploid spermatozoon cannot be excluded with certainty.
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