PMID: 15820045Apr 12, 2005

Paternal effects on cell division in the human preimplantation embryo

Reproductive Biomedicine Online
Jan Tesarik


Cell divisions in the human preimplantation embryo can be compromised by deficiencies in sperm nuclear genome or sperm-derived developmentally relevant cytoplasmic factors, oocyte activating substance and centriole. Sperm nuclear deficiencies are usually not detected before the 8-cell stage of embryo development, when a major expression of sperm-derived genes has begun. Sperm cytoplasmic deficiencies can be detected as early as the 1-cell zygote and then throughout the preimplantation development. The terms 'late paternal effect' and 'early paternal effect' have been suggested to denote these two pathological conditions. The late paternal effect is associated with an increased incidence of sperm DNA fragmentation. No association with sperm DNA damage has been found for the early paternal effect. The diagnosis of the late paternal effect is thus based on the examination of sperm DNA integrity, which should be performed in cases of repeated assisted reproduction failure even if morphologically normal embryos result from fertilization with the patient's spermatozoa. The only element leading to the diagnosis of the early paternal effect is poor zygote and embryo morphology and low cleavage speed. The absence of increased sperm DNA ...Continue Reading


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Related Concepts

DNA Fragmentation
Entire Embryo
Science of Morphology
Cell Division
Sperm Cell
Spermatozoa Cell Count
Cytokinesis of the Fertilized Ovum
Embryonic Development

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