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Development ePress online publication date 27 Aug 2003
doi: 10.1242/dev.00731

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Research article

DOC1R: a MAP kinase substrate that control microtubule organization of metaphase II mouse oocytes


M. Emilie Terret, Christophe Lefebvre, Alexandre Djiane, Pascale Rassinier, Jacques Moreau, Bernard Maro, and Marie-Hélène Verlhac*
* Author for correspondence (e-mail: marie-helene.verlhac{at}snv.jussieu.fr)

For the success of fertilization, spindles of vertebrate oocytes must remain stable and correctly organized during the arrest in metaphase II of meiosis. Using a two-hybrid screen with MAPK as a bait, we have recently identified MISS (MAPK interacting and spindle stabilizing) which controls mouse oocyte metaphase II spindle stability. Using the same screen, we identify another MAPK partner, DOC1R (Deleted in oral cancer one related), a murine homologue of a potential human tumor suppressor gene. We characterize DOC1R during mouse oocyte meiosis resumption. DOC1R is regulated by phosphorylation during meiotic maturation by MPF (M-phase promoting factor) and by the MOS/{vdash}/MAPK pathway. DOC1R and a DOC1R-GFP fusion localize to microtubules during meiotic maturation. Consistent with this microtubular localization, we show, by antisense and double-stranded RNA injection, that depletion of DOC1R induces microtubule defects in metaphase II oocytes. These defects are rescued by overexpressing a Xenopus DOC1R, showing that they are specific to DOC1R. Thus, the discovery of DOC1R, a substrate of MAPK that regulates microtubule organization of metaphase II mouse oocytes, reinforces the importance of this pathway in the control of spindle stability during the metaphase II arrest.


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