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• W2026277656 abstract "Parthenogenetically activated mammalian oocytes have been used in the past decade as cytoplasts, in an attempt to support the development of nuclear transplant embryos. The present experiments were undertaken to study the DNA synthesis and the organisation of microtubules, nuclear envelope and chromatin during the first cell cycle of electrically activated porcine oocytes (parthenotes) matured in vitro by using immunocytochemistry and laser scanning confocal microscopy. The results showed that pronuclear-like (PN) formation began 4-5 h post-activation (hpa), whilst DNA synthesis as revealed by bromodeoxyuridine incorporation was initiated 5-6 hpa, with a maximum number of labelled oocytes (73%) around 11 hpa, and persisted in some parthenotes until 15-16 hpa. In the metaphase II (MII) oocytes, microtubules were detected only in the metaphase II spindle; no lamin A/C antigen was observed. Electrical DC pulses resulted in 91% of MII oocytes being activated and confocal microscopy indicated that microtubules were assembled in the spindle first for the extrusion of a second polar body, and for the second time for division from one to two cells. Nuclear envelope, indicated by anti-lamin A/C stain, was formed around the time of PN formation and surrounded the nuclear chromatin of 1- and 2-cell parthenogenotes. These results demonstrate that the apparent normality in both DNA synthesis and dynamics of microtubules and nuclear envelope is involved with chromosomal organisation in the parthenotes. In addition, the use of electrically activated IVM oocytes for both nuclear transfer and parthenogenetic studies in pigs is discussed." @default.
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• W2026277656 date "1996-05-01" @default.
• W2026277656 modified "2023-09-23" @default.
• W2026277656 title "DNA synthesis, microtubule and nuclear dynamics in porcine parthenotes" @default.
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• W2026277656 doi "https://doi.org/10.1017/s0967199400003014" @default.
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