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Bovine abnormal preimplantation embryos: analysis of segregated cells occurring in the subzonal space and/or blastocoele cavity for their nuclear morphology and persistence of RNA synthesis

Published online by Cambridge University Press:  19 June 2002

J. Pivko ,
P. Grafanau  and
E. Kubovičová
J. Pivko
Affiliation:
Research Institute of Animal Production, Institute for Genetics and Reproduction, Nitra, Slovak Republic
P. Grafanau
Affiliation:
Research Institute of Animal Production, Institute for Genetics and Reproduction, Nitra, Slovak Republic
E. Kubovičová
Affiliation:
Research Institute of Animal Production, Institute for Genetics and Reproduction, Nitra, Slovak Republic
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Abstract

Bovine embryos in the early blastocyst/blastocyst stage were analysed by [5-3H]uridine labelling followed by electron microscopic autoradiography. In normal control embryos an intact zona pellucida, evenly developed blastomeres and a transparent perivitelline space were seen. In this group, the blastomeres of the trophoblast and embryoblast showed high homogeneous labelling localised in the nucleoplasm and even more intense labelling in the nucleolus. On the contrary, in addition to evident cytoplasmic disintegration, a clearly different labelling pattern and a low labelling intensity were observed in the nuclei of the segregated cells in the subzonal space and in those free in the blastocoele cavity. A typical nuclear morphological feature of these blastomeres was chromatin marginalisation, similar to that observed in embryos treated with actinomycin D for transcription inhibition. It is concluded that the segregated cells are arrested in their further differentiation.

Keywords

BlastocystBovine embryosEarly blastocystElectron microscopyRNA autoradiography
Type
Research Article
Information
Zygote , Volume 10 , Issue 2 , May 2002 , pp. 141 - 147
Copyright
2002 Cambridge University Press

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