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Quantitative Analysis of Protein Expression to Study Lineage Specification in Mouse Preimplantation Embryos
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The first lineage determination in mammals.

Peter L Pfeffer1

  • 1School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand.

Developmental Biology
|May 18, 2024
PubMed
Summary

This review details early embryo development, focusing on how cell compaction and polarity influence gene networks. It highlights conserved YAP/WWTR signaling in trophoblast development across mammals, despite species-specific timing and downstream gene variations.

Keywords:
CompactionFirst lineage decisionPolarisationTrophoblast

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Area of Science:

  • Developmental Biology
  • Genetics
  • Cell Biology

Background:

  • Early mammalian embryonic development involves critical cell fate decisions.
  • Compaction and polarity establishment are key events influencing cell differentiation.
  • Gene regulatory networks (GRNs) govern the divergence of embryonic cell lineages.

Purpose of the Study:

  • To review the morphological, cytoskeletal, and gene expression events leading to trophoblast and inner cell mass cell differentiation.
  • To explore the role of YAP/WWTR signaling in trophoblast induction across mammalian species.
  • To compare species-specific mechanisms and downstream targets of YAP/WWTR signaling.

Main Methods:

  • Review of existing literature on preimplantation mammalian embryo development.
  • Analysis of morphological and gene expression data related to compaction and polarity.
  • Comparative analysis of YAP/WWTR signaling pathways and downstream targets across species.

Main Results:

  • YAP/WWTR signaling plays a conserved role in trophoblast induction in eutherian mammals.
  • Compaction and polarity establishment influence YAP/WWTR activity and cell fate.
  • Mechanisms and timing of YAP/WWTR activation vary across species (mouse, human, cattle, pig, rabbit).
  • GATA3 is a direct downstream target of YAP/WWTR in all examined mammals; CDX2 and SOX2 regulation differs.

Conclusions:

  • YAP/WWTR signaling is a fundamental pathway for trophoblast development in mammals.
  • Species-specific differences in YAP/WWTR activation and downstream targets highlight evolutionary adaptations.
  • Understanding these conserved and divergent mechanisms is crucial for reproductive biology and developmental research.