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Related Experiment Video

Updated: Feb 3, 2026

Efficient Derivation of Human Cardiac Precursors and Cardiomyocytes from Pluripotent Human Embryonic Stem Cells with Small Molecule Induction
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SMAD4 Is Essential for Human Cardiac Mesodermal Precursor Cell Formation.

Jiejia Xu1, Peter J Gruber2, Kenneth R Chien1,3

  • 1Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden.

Stem Cells (Dayton, Ohio)
|October 31, 2018
PubMed
Summary

SMAD4 is essential for forming cardiac mesoderm and cardiomyocyte progenitors in human embryonic stem cells (hESCs). Its absence prevents proper cardiac development, highlighting its role in congenital heart defect pathways.

Keywords:
HeartHuman embryonic stem cellsMesodermSMAD4

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Cardiovascular Research

Background:

  • Congenital cardiovascular defects are linked to mutations in transforming growth factor (TGF)β signaling pathways.
  • Smad4 loss-of-function in mice causes early embryonic lethality, suggesting a critical role in development.

Purpose of the Study:

  • To investigate the role of SMAD4 in the earliest stages of human cardiogenesis.
  • To understand the molecular mechanisms underlying human cardiomyocyte progenitor formation.

Main Methods:

  • Generation of SMAD4 mutant human embryonic stem cells (hESCs).
  • Assessment of hESC self-renewal and differentiation into neuroectoderm and cardiac lineages.
  • Transcriptional profiling of SMAD4 mutant cells.

Main Results:

  • SMAD4 is not required for hESC self-renewal or neuroectoderm formation.
  • Loss of SMAD4 is essential for cardiac mesoderm formation and subsequent cardiomyocyte differentiation.
  • SMAD4 mutant cells fail to generate cardiac mesodermal precursors, impacting primitive streak gene expression.

Conclusions:

  • SMAD4 plays a critical role in the early cell fate decisions during human cardiac mesodermal precursor formation.
  • Defective cardiac mesodermal precursor formation due to SMAD4 pathway disruption may contribute to congenital heart malformations.
  • NODAL/SMAD4 signaling is crucial for establishing cardiac mesodermal precursors via primitive streak gene regulation.