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Basement membrane perforations guide anterior-posterior axis formation.

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Asymmetric basement membrane perforations guide distal visceral endoderm migration, establishing the anterior-posterior axis in mammalian development. This mechanism, involving tissue remodeling and mechanical forces, is conserved across species.

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Area of Science:

  • Developmental Biology
  • Cell Migration
  • Extracellular Matrix Biology

Background:

  • The establishment of the anterior-posterior (AP) axis is a fundamental symmetry-breaking event in mammalian development.
  • Directed migration of the distal visceral endoderm (DVE) is crucial for AP axis specification in mice.

Purpose of the Study:

  • To investigate the role of basement membrane structure in guiding DVE migration.
  • To elucidate the mechanisms by which directional cues are established for DVE migration during mammalian development.

Main Methods:

  • Targeted perturbations of basement membranes.
  • Light-sheet microscopy and tissue cartography.
  • Physical modeling and live imaging of DVE protrusions.

Main Results:

  • Asymmetric perforations in the basement membrane direct DVE migration.
  • Matrix metalloproteinases create uneven perforations, providing directional cues.
  • Migrating DVE deforms surrounding tissues, and perforations orchestrate force generation within the DVE.

Conclusions:

  • Basement membrane remodeling and mechanical heterogeneity are critical for guiding directional tissue migration.
  • Enriched perforations near the anterior hypoblast in human and stem cell-derived embryos suggest a conserved AP axis specification mechanism.