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Illegal Beings: Human Clones
Karyoplast-cytoplast volume ratio in bovine nuclear transfer embryos: effect on developmental pote
Zakhartchenko V, Stojkovic M, Brem G, Wolf EMol Reprod Dev. 1997 Nov;48(3):332-8..
Bayerisches Forschungszentrum fur Fortpflanzungsbiologie, Oberschleissheim, Germany.
To evaluate the effect of karyoplast-cytoplast ratio on the development of nuclear transfer embryos, karyoplasts from day 4, day 5, and day 6 embryos were transferred to oocytes enucleated with different volumes of cytoplasm: Type 1, removal of a small volume of cytoplasm equivalent to the first polar body, Type 2, removal of a volume of cytoplasm approximately equal to the volume of the respective karyoplast, and Type 3, removal of half of the oocyte volume. In addition, the effect of experimental reduction of karyoplast cytoplasm was investigated in day 4 and day 5 karyoplasts. Intact day 4 karyoplasts fused to Type 3 cytoplasts did not support development to blastocysts, whereas these karyoplasts yielded blastocysts in combination with Type 1 (7%) and Type 2 cytoplasts (12%). After experimental reduction of cytoplasmic volume in day 4 karyoplasts, blastocysts (10%) were also obtained after fusion with Type 3 cytoplasts, probably due to reduction of cytoplasmic chimerism. With day 5 karyoplasts, blastocyst rate was higher in combination with Type 2 (34%) than with Type 1 (19%) and Type 3 cytoplasts (16%; P < 0.05). The use of day 6 intact karyoplasts resulted in a significantly (P < 0.05) higher proportion of blastocysts when fused with Type 2 (38%) or Type 1 cytoplasts (34%) than with Type 3 cytoplasts (16%). These results suggest that enucleation of oocytes with a volume similar to that of the respective karyoplast creates better conditions for cell cycle interactions with all types of karyoplasts than enucleation with minimal or large volume of cytoplasm.
This Message is being posted for educational purposes, as well as for comment and criticism, by the visitors to the HumanCloning.org Foundation website (http://www.humancloning.org ).
Disclaimer: This abstract is being posted for educational purposes, as well as for comment and criticism, by the visitors to the Human Cloning Foundation website (www.HumanCloning.org ). This abstract is representative of a larger article that is indexed on Medline.
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