Abstract
Here we show that segregation of homologous chromosomes and that of sister chromatids are differentially regulated in Xenopus and possibly in other higher eukaryotes. Upon hormonal stimulation, Xenopus oocytes microinjected with antibodies against the anaphase-promoting complex (APC) activator Fizzy or the APC core subunit Cdc27, or with the checkpoint protein Mad2, a destruction-box peptide or methylated ubiquitin, readily progress through the first meiotic cell cycle and arrest at second meiotic metaphase. However, they fail to segregate sister chromatids and remain arrested at second meiotic metaphase when electrically stimulated or when treated with ionophore A34187, two treatments that mimic fertilization and readily induce chromatid segregation in control oocytes. Thus, APC is required for second meiotic anaphase but not for first meiotic anaphase.
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Acknowledgements
We are grateful to H. Zou and M. Kirschner for providing the Securin constructs. We thank Pierre Travo, head of the IFR 24 Integrated Imaging Facility for his constant interest and support. This work was supported by grants from the Association pour la Recherche sur le Cancer and the Ligue Nationale contre le Cancer. We apologise to our collegues whose work has not been cited as a result of referencing constraints.
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Peter, M., Castro, A., Lorca, T. et al. The APC is dispensable for first meiotic anaphase in Xenopus oocytes . Nat Cell Biol 3, 83–87 (2001). https://doi.org/10.1038/35050607
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DOI: https://doi.org/10.1038/35050607
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