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1 June 2000 Onset of the First S-Phase Is Determined by a Paternal Effect During the G1-Phase in Bovine Zygotes
P. Comizzoli, B. Marquant-Le Guienne, Y. Heyman, J. P. Renard
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Abstract

The aim of this study was to characterize the respective influences of the paternal and the maternal components on the timing of the first S-phase in the bovine zygote. In vitro-matured oocytes were fertilized in vitro with sperm conferring a high blastocyst rate (embryos of group 1) or a low blastocyst rate (embryos of group 2). Resulting zygotes were either allowed to develop in vitro to the blastocyst stage or exposed to 5′-bromo-2′-deoxyuridine in order to characterize the timing of their first S-phases. Timing of pronuclear formation was similar in the two groups, but the onset of S-phase and the first cleavage occurred earlier in group 1 than in group 2. We also showed that the length of the S-phase represented 30% of the first cell cycle in group 1 and 20% in group 2. Differences in times of onset of the first S-phase observed between embryo groups concerned both male and female pronuclei in a similar manner and were not dependent on the maternal component of the zygote. Our data demonstrated that the precocity of the onset of the first S-phase stemmed from a paternal control exerted during a transient period of the G1-phase.

P. Comizzoli, B. Marquant-Le Guienne, Y. Heyman, and J. P. Renard "Onset of the First S-Phase Is Determined by a Paternal Effect During the G1-Phase in Bovine Zygotes," Biology of Reproduction 62(6), 1677-1684, (1 June 2000). https://doi.org/10.1095/biolreprod62.6.1677
Received: 26 October 1999; Accepted: 1 January 2000; Published: 1 June 2000
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