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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Human Embryogenesis

Background:

  • Vertebrate segmentation, crucial for development, is poorly understood in humans due to limitations.
  • Existing human pluripotent stem cell models struggle to recapitulate somitogenesis accurately in space and time.

Purpose of the Study:

  • To develop a robust 3D model for studying human segmentation and somitogenesis.
  • To investigate the molecular mechanisms underlying somite formation and stabilization.
  • To explore the potential of this model for studying congenital spine diseases.

Main Methods:

  • Development of a pluripotent stem cell-derived mesoderm-based 3D model termed 'axioloid'.
  • Analysis of oscillatory dynamics of the segmentation clock, morphological and molecular characteristics.
  • Investigation of signaling pathways including FGF-WNT and retinoic acid.
  • Comparative analysis with human embryos and use of patient-derived induced pluripotent stem cells.

Main Results:

  • Axioloids accurately recapitulate human segmentation clock dynamics and somite formation in vitro.
  • The model exhibits correct rostrocaudal patterning and signaling gradients (FGF-WNT, retinoic acid).
  • Retinoic acid signaling plays a critical role in segment stabilization, interacting with the extracellular matrix.
  • Axioloids show high similarity to human embryos, including Hox code expression.
  • The model successfully demonstrated disease modeling for congenital spine diseases using patient-derived iPSCs.

Conclusions:

  • Axioloids provide a powerful new platform for studying human axial development and somitogenesis in vitro.
  • The model elucidates the role of retinoic acid in somite stabilization and epithelialization.
  • Axioloids are valuable for investigating the pathogenesis of human congenital spine diseases and for drug screening.