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Pulsatile cell-autonomous contractility drives compaction in the mouse embryo.

Jean-Léon Maître1, Ritsuya Niwayama1, Hervé Turlier1

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|June 16, 2015
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This summary is machine-generated.

Mammalian embryo compaction, crucial for development, is driven by cell-medium tension, not just cell adhesion molecules. The actomyosin cortex generates pulsed contractions, revealing new insights into early embryogenesis.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Embryogenesis

Background:

  • Mammalian embryonic morphogenesis begins with compaction, a process vital for blastocyst lineage specification.
  • Compaction in 8-cell mouse embryos involves enlarged cell-cell contacts, previously attributed to Cadherin 1 (Cdh1).

Purpose of the Study:

  • To investigate the primary forces driving mammalian embryo compaction.
  • To elucidate the role of Cadherin 1 (Cdh1) and the actomyosin cortex in compaction.

Main Methods:

  • Micropipette aspiration was used to map tensions within the developing embryo.
  • Tension mapping was performed on wild-type and mutant (mzCdh1(-/-)) embryos.

Main Results:

  • Compaction is primarily driven by a twofold increase in cell-medium interface tension.
  • The actomyosin cortex generates pulsed contractions, acting as the main force generator.
  • Cadherin 1 (Cdh1) appears to redirect contractility away from cell-cell contacts, rather than generating compaction forces directly.

Conclusions:

  • Early mammalian embryogenesis and compaction are governed by actomyosin cortex contractility and cell-medium tension.
  • Cadherin 1's role in compaction is indirect, influencing force distribution.
  • Pulsed contractions are an evolutionarily conserved mechanism in development.