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BACKGROUND Several randomized controlled trials have not shown a benefit from preimplantation genetic screening (PGS) biopsy of cleavage-stage embryos and assessment of up to 10 chromosomes for aneuploidy. Therefore, a proof-of-principle study was planned to determine the reliability of alternative form of PGS, i.e. PGS by polar body (PB) biopsy, with whole(More)
Over 200 recessive X chromosome-linked diseases, typically affecting only hemizygous males, have been identified. In many of these, prenatal diagnosis is possible by chorion villus sampling (CVS) or amniocentesis, followed by cytogenetic, biochemical or molecular analysis of the cells recovered from the conceptus. In others, the only alternative is to(More)
The distribution of binding sites for rabbit anti-species antiserum, Concanavalin A (Con A) and peanut agglutinin (PNA) on dissociated blastomeres from 2- to 16-cell mouse embryos has been investigated using direct and indirect fluorescence techniques. With each ligand, paraformaldehyde-fixed blastomeres from 2- to 8-cell precompact embryos were uniformly(More)
Screening of human preimplantation embryos for numerical chromosome abnormalities has been conducted mostly at the preimplantation stage using fluorescence in situ hybridization. However, it is clear that preimplantation genetic screening (PGS) as it is currently practiced does not improve live birth rates. Therefore the ESHRE PGS Task Force has decided to(More)
A single cell was removed, through a hole made in the zona pellucida, from each of 30 human embryos at the 6-10 cell cleavage stage three days after in-vitro fertilisation. A normal proportion of the embryos (37%) developed to the blastocyst stage by day six in culture and 6 hatched from the zona. Each male embryo was sexed from the DNA by amplification of(More)
The nuclei of disaggregated blastomeres from two hundred preimplantation human embryos were examined between days 2 and 4 after insemination in vitro by vital labelling with a polynucleotide-specific fluorochrome. Although the majority of blastomeres had a single nucleus, binucleate blastomeres containing two nuclei of equal size were common and other(More)
BACKGROUND The purpose of this study was to assess the technical aspects related to polar body (PB) biopsy, which might have an influence on the results of the microarray comparative genomic hybridization analysis. Furthermore, a comparison was made between two biopsy methods (mechanical and laser). METHODS Biopsy of the first and second PB (PB1 and PB2)(More)
Methods are described for distinguishing inner and outer blastomeres of compact 8- to 32-cell mouse morulae. The first involves the selective labelling by immunofluorescent reagents of the exposed surface of the compact morula, disaggregation of the morula into single blastomeres and separation of these blastomeres into partially labelled (presumptive(More)