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The tumor suppressor SMAD4/DPC4 is essential for epiblast proliferation and mesoderm induction in mice

X Yang1, C Li, X Xu

  • 1Laboratory of Biochemistry and Metabolism, 10/9N105, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 9, 1998
PubMed

Insights

SMAD4 is crucial for early embryonic development. Its absence prevents mesoderm formation, leading to developmental delays and embryonic lethality in mice.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Transforming growth factor (TGF)-beta superfamily members are vital for embryogenesis.
  • SMAD4 (DPC4) is a key mediator of TGF-beta signaling pathways.
  • Understanding SMAD4's role is critical for comprehending developmental processes.

Purpose of the Study:

  • To investigate the function of SMAD4 during murine embryogenesis.
  • To elucidate the role of SMAD4 in mesoderm induction and early development.

Main Methods:

  • Generation of Smad4-mutated mice by truncating the C-domain.
  • Analysis of Smad4 expression patterns during embryogenesis.
  • Phenotypic analysis of Smad4 mutant embryos and blastocyst outgrowths.

Main Results:

  • Smad4 is ubiquitously expressed in developing mouse embryos.
  • Smad4 homozygous mutants (Smad4(ex8/ex8)) exhibit developmental delays and lethality between E6.5-E8.5.
  • Mutant embryos fail to form mesoderm, showing defects in epiblast proliferation and egg cylinder formation.
  • Cultured Smad4 mutant blastocysts display impaired proliferation and endoderm differentiation.

Conclusions:

  • SMAD4-mediated signaling is essential for epiblast proliferation and egg cylinder formation.
  • SMAD4 is required for proper mesoderm induction during early embryogenesis.
  • These findings highlight SMAD4's indispensable role in embryonic development.

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