Molecular Human Reproduction, Vol. 5, No. 4, 382-389,
April 1999
© 1999 European Society of Human Reproduction and Embryology
Clinical experience of sex determination by fluorescent in-situ hybridization for preimplantation genetic diagnosis
1 Centre for Reproductive Medicine and 2 Centre for Genetics, University Hospital, Dutch-speaking Brussels Free University (Vrije Universiteit Brussel), Laarbeeklaan 101, B-1090 Brussels, Belgium
In our centre we started using fluorescent in-situ hybridization (FISH) technique for sexing in couples with sex-linked diseases in May 1995. Probes specific for chromosomes X, Y and 18 were applied, allowing us to detect simultaneously both gender and ploidy status. The efficiency of the FISH procedure is 90.4% per biopsied blastomere or 95.2% per biopsied blastomere with a distinct nucleus visible at spreading. Up to December 1997, we treated 15 couples (20 treatment cycles) at risk for X-linked recessive disease and two couples with Yq deletion (two treatment cycles) with the aim of transferring only female embryos. In one cycle, no embryos suitable for biopsy were obtained and in five cycles no normal female embryos were available at diagnosis. In the remaining 16 cycles, transfer was possible and six pregnancies ensued: one miscarriage has occurred and six children have been born from the other five pregnancies. The implantation rate (fetal sacs) per transferred embryo was 20.8%. In 98 (61%) of the 161 diagnosed embryos, a diploid status was observed in one or in both biopsied blastomeres. In 10 out of the 161 (6.2%) embryos a heterogeneity among the two biopsied blastomeres was found: a diploid nucleus in one blastomere and a non-diploid pattern or binuclear status in the other. In the remaining 53 (32.9%) out of 161 diagnosed embryos, the biopsied blastomeres were abnormal. The embryos that were not transferred or frozen were further analysed. When two sex chromosomes and two autosomes were present in the biopsied blastomere, the sex determination of the biopsied blastomere was never in conflict with the sex determination in the rest of the embryo. Furthermore, if the biopsied cell was diagnosed as abnormal (triploid, aneuploid, chaotic) the embryo was indeed completely abnormal or at least mosaic. A FISH error could not be excluded in two embryos (1.2%); however, a wrong gender determination did not result from this.
FISH/PGD/X-linked disease
3 To whom correspondence should be addressed
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