Human Reproduction, Vol 12, 780-784, Copyright © 1997 by Oxford University Press
S Munne, C Magli, A Adler, G Wright, K de Boer, D Mortimer, M Tucker, J Cohen and L Gianaroli
Mosaicism was studied in good quality embryos from four different centres
in order to assess the effects of follicular induction and exposure to
laboratory conditions on chromosomal status. The donated embryos were fully
biopsied and analysed by fluorescence in-situ hybridization using probes
for chromosomes X, Y, 13, 18 and 21, simultaneously. The number of abnormal
cells present indicated the division at which mosaicism first occurred (4/4
cells at first division, 2/4 cells at second, 2/8 at third). The rate of
mosaicism in embryos from different centres varied greatly (P < 0.001).
Most of the mosaic embryos were obtained before 1991. In one clinic
increased mosaicism was found in embryos obtained before 1991 when compared
to embryos obtained thereafter. The results suggest that certain culture
conditions and/or hormonal stimulation protocols may induce chromosomal
abnormalities and partly explain differences in pregnancy rates between
in-vitro fertilization centres.
ARTICLES
Treatment-related chromosome abnormalities in human embryos
Cornell University Medical Center-The New York Hospital, NY 10021, USA.
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