Control of Cdc6 accumulation by Cdk1 and MAPK is essential for completion of oocyte meiotic divisions in Xenopus - Biologie de l'ovocyte Accéder directement au contenu
Article Dans Une Revue Journal of Cell Science Année : 2015

Control of Cdc6 accumulation by Cdk1 and MAPK is essential for completion of oocyte meiotic divisions in Xenopus

Enrico M. Daldello
Tran Le
  • Fonction : Auteur
Robert Poulhe
  • Fonction : Auteur
Catherine Jessus
  • Fonction : Auteur
Olivier Haccard
Aude Dupre
  • Fonction : Auteur

Résumé

Vertebrate oocytes proceed through the first and the second meiotic division without an intervening S-phase to become haploid. Although DNA replication does not take place, unfertilized oocytes acquire the competence to replicate DNA one hour after the first meiotic division by accumulating an essential factor of the replicative machinery, Cdc6. Here, we show that the turnover of Cdc6 is precisely regulated in oocytes to avoid inhibition of Cdk1. At meiosis resumption, Cdc6 is expressed but cannot accumulate owing to a degradation mechanism that is activated through Cdk1. During transition from the first to the second meiotic division, Cdc6 is under the antagonistic regulation of B-type cyclins (which interact with and stabilize Cdc6) and the Mos-MAPK pathway (which negatively controls Cdc6 accumulation). Because overexpressing Cdc6 inhibits Cdk1 reactivation and drives oocytes into a replicative interphasic state, the fine-tuning of Cdc6 accumulation is essential to ensure two meiotic waves of Cdk1 activation and to avoid unscheduled DNA replication during meiotic maturation.

Dates et versions

hal-01538511 , version 1 (13-06-2017)

Identifiants

Citer

Enrico M. Daldello, Tran Le, Robert Poulhe, Catherine Jessus, Olivier Haccard, et al.. Control of Cdc6 accumulation by Cdk1 and MAPK is essential for completion of oocyte meiotic divisions in Xenopus. Journal of Cell Science, 2015, 128 (14), pp.2482-2496. ⟨10.1242/jcs.166553⟩. ⟨hal-01538511⟩
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