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Related Experiment Videos

Multipotent cell lineages in early mouse development depend on SOX2 function.

Ariel A Avilion1, Silvia K Nicolis, Larysa H Pevny

  • 1Division of Developmental Genetics, MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.

Genes & Development
|January 7, 2003
PubMed
Summary
This summary is machine-generated.

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SOX2 is essential for mammalian embryo development, playing a cell-autonomous role in epiblast and extraembryonic ectoderm lineages. Its function is critical for early cell fate decisions and establishing key embryonic lineages alongside OCT4.

Area of Science:

  • Developmental Biology
  • Genetics
  • Stem Cell Biology

Background:

  • Cell lineage specification in mammalian embryos relies on intrinsic factors and interdependencies.
  • OCT4 and SOX2 transcription factors are known to regulate gene expression critical for early embryonic development, including Fgf4.
  • Understanding the precise roles of SOX2 in early mammalian development is crucial for comprehending lineage determination.

Purpose of the Study:

  • To investigate the cell-autonomous requirement of SOX2 in mammalian embryonic development.
  • To elucidate the phenotypic consequences of SOX2 inactivation in vivo and in chimeric embryos.
  • To determine the role of SOX2 in the specification of epiblast and extraembryonic ectoderm lineages.

Main Methods:

  • Gene targeting was employed to create Sox2-inactivated mouse embryos.

Related Experiment Videos

  • Phenotypic analysis was conducted on mutant embryos.
  • Chimeric embryo experiments were performed using wild-type embryonic stem cells to rescue the epiblast.

    • Main Results:

    • Sox2 exhibits a cell-autonomous requirement in both the epiblast and extraembryonic ectoderm.
    • The absence of SOX2 impacts the chorion after 7.5 days postcoitum, suggesting a later critical role.
    • Maternal SOX2 protein may mask earlier developmental roles within the inner cell mass.

    Conclusions:

    • SOX2 is indispensable for the development of both embryonic and extraembryonic lineages.
    • Maternal factors play a significant role in early cell fate decisions.
    • A combinatorial code involving SOX2 and OCT4 is essential for specifying the initial three lineages during mammalian implantation.