| First Author | Cui C | Year | 2014 |
| Journal | BMC Dev Biol | Volume | 14 |
| Pages | 33 | PubMed ID | 25059436 |
| Mgi Jnum | J:214090 | Mgi Id | MGI:5588051 |
| Doi | 10.1186/s12861-014-0033-x | Citation | Cui C, et al. (2014) 14-3-3 epsilon prevents G2/M transition of fertilized mouse eggs by binding with CDC25B. BMC Dev Biol 14(1):33 |
| abstractText | BACKGROUND: The 14-3-3 (YWHA) proteins are highly conserved in higher eukaryotes, participate in various cellular signaling pathways including cell cycle regulation, development and growth. Our previous studies demonstrated that 14-3-3epsilon (YWHAE) is responsible for maintaining prophase | arrest in mouse oocyte. However, roles of 14-3-3epsilon in the mitosis of fertilized mouse eggs have remained unclear. Here, we showed that 14-3-3epsilon interacts and cooperates with CDC25B phosphorylated at Ser321 regulating G2/M transition of mitotic progress of fertilized mouse eggs. RESULTS: Disruption of 14-3-3epsilon expression by RNAi prevented normal G2/M transition by inhibition of MPF activity and leaded to the translocation of CDC25B into the nucleus from the cytoplasm. Overexpression of 14-3-3epsilon-WT and unphosphorylatable CDC25B mutant (CDC25B-S321A) induced mitotic resumption in dbcAMP-arrested eggs. In addition, we examined endogenous and exogenous distribution of 14-3-3epsilon and CDC25B. Endogenous 14-3-3epsilon and CDC25B were co-localized primarily in the cytoplasm at the G1, S, early G2 and M phases whereas CDC25B was found to accumulate in the nucleus at the late G2 phase. Upon coexpression with RFP-14-3-3epsilon, GFP-CDC25B-WT and GFP-CDC25B-S321A were predominantly cytoplasmic at early G2 phase and then GFP-CDC25B-S321A moved to the nucleus whereas CDC25B-WT signals were observed in the cytoplasm without nucleus accumulation at late G2 phase at presence of dbcAMP. CONCLUSIONS: Our data indicate that 14-3-3epsilon is required for the mitotic entry in the fertilized mouse eggs. 14-3-3epsilon is primarily responsible for sequestering the CDC25B in cytoplasm and 14-3-3epsilon binding to CDC25B-S321 phosphorylated by PKA induces mitotic arrest at one-cell stage by inactivation of MPF in fertilized mouse eggs. |
