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Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
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Novel tissue interactions support the evolution of placentation.

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New placental structures arise from novel signaling networks between maternal and fetal tissues. This review explores how these interactions drive the evolution of placentation and embryonic development.

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Area of Science:

  • Evolutionary developmental biology
  • Reproductive biology
  • Comparative physiology

Background:

  • Organogenesis relies on coordinated tissue interactions and signaling.
  • The placenta evolves repeatedly, offering insights into new organ evolution.
  • Placentas form from maternal-fetal tissue interactions, suggesting potential for novel signaling dynamics.

Purpose of the Study:

  • To investigate the origin and evolution of new tissue-tissue signaling networks in organ development.
  • To demonstrate how placental evolution is driven by novel signaling interactions between maternal and fetal tissues.
  • To explore the conserved signaling potential across the oviparity-viviparity transition.

Main Methods:

  • Review of published data and examples on placental development.
  • Analysis of signaling interactions between maternal and fetal tissues in vertebrates.
  • Comparative study across different reproductive strategies (oviparity and viviparity).

Main Results:

  • Placentas originate from hormonally active organs.
  • Significant signaling potential exists between maternal and fetal tissues in egg-laying vertebrates.
  • This signaling potential is conserved during the transition to live birth (viviparity).
  • Interactions between placental tissues are foundational to implantation and placental regulation.

Conclusions:

  • Novel signaling interactions are the basis for new placental regulatory networks, functions, and patterning.
  • The evolution of placentas is driven by the emergence of new signaling dynamics between interacting tissues.
  • Understanding these interactions is key to comprehending the evolution of new organs.