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  Maternal Oct-4 is a potential key regulator of the developmental competence of mouse oocytes

Zuccotti, M., Merico, V., Sacchi, L., Bellone, M., Brink, T. C., Bellazzi, R., et al. (2008). Maternal Oct-4 is a potential key regulator of the developmental competence of mouse oocytes. BMC Developmental Biology, 8, 8:97-8:97. doi:10.1186/1471-213X-8-97.

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Genre: Journal Article
Alternative Title : BMC Dev Biol

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 Creators:
Zuccotti, Maurizio, Author
Merico, Valeria, Author
Sacchi, Lucia, Author
Bellone, Michele, Author
Brink, Thore C.1, Author           
Bellazzi, Riccardo, Author
Stefanelli, Mario, Author
Redi, Carlo Alberto, Author
Garagna, Silvia, Author
Adjaye, James2, Author           
Affiliations:
1Dept. of Vertebrate Genomics (Head: Hans Lehrach), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1433550              
2Molecular Embryology and Aging (James Adjaye), Dept. of Vertebrate Genomics (Head: Hans Lehrach), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1479654              

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 Abstract: Background The maternal contribution of transcripts and proteins supplied to the zygote is crucial for the progression from a gametic to an embryonic control of preimplantation development. Here we compared the transcriptional profiles of two types of mouse MII oocytes, one which is developmentally competent (MIISN oocyte), the other that ceases development at the 2-cell stage (MIINSN oocyte), with the aim of identifying genes and gene expression networks whose misregulated expression would contribute to a reduced developmental competence. Results We report that: 1) the transcription factor Oct-4 is absent in MIINSN oocytes, accounting for 2) the down-regulation of Stella, a maternal-effect factor required for the oocyte-to-embryo transition and of which Oct-4 is a positive regulator; 3) eighteen Oct-4-regulated genes are up-regulated in MIINSN oocytes and are part of gene expression networks implicated in the activation of adverse biochemical pathways such as oxidative phosphorylation, mitochondrial dysfunction and apoptosis. Conclusion The down-regulation of Oct-4 plays a crucial function in a sequence of molecular processes that leads to the developmental arrest of MIINSN oocytes. The use of a model study in which the MII oocyte ceases development consistently at the 2-cell stage has allowed to attribute a role to the maternal Oct-4 that has never been described before. Oct-4 emerges as a key regulator of the molecular events that govern the establishment of the developmental competence of mouse oocytes.

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Language(s): eng - English
 Dates: 2008
 Publication Status: Issued
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Title: BMC Developmental Biology
  Alternative Title : BMC Dev Biol
Source Genre: Journal
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Pages: - Volume / Issue: 8 Sequence Number: - Start / End Page: 8:97 - 8:97 Identifier: ISSN: 1471-213X