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Totipotency or plenipotency: rethinking stem cell bipotentiality.

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Totipotency is often misapplied to bipotential stem cells lacking organism-generating capacity. This review clarifies terminology, distinguishing totipotency, pluripotency, and plenipotency for better understanding of early development.

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Reproductive Medicine

Background:

  • The term 'totipotency' is frequently misapplied in stem cell research to describe cells with bipotentiality.
  • Current terminology lacks a clear distinction between bipotential stem cells and pluripotent cells, particularly regarding extraembryonic tissue contribution.
  • Misapplication of 'totipotency' hinders accurate understanding of early embryonic development and stem cell capabilities.

Purpose of the Study:

  • To critically examine the developmental continuum from totipotency to pluripotency.
  • To re-evaluate the concept of plenipotency in the context of preimplantation development.
  • To refine stem cell terminology by distinguishing totipotency, pluripotency, and plenipotency.

Main Methods:

  • Review of existing literature on early embryonic development and stem cell biology.
  • Analysis of developmental potential and fate decision-making capacity in various cell types.
  • Comparison of totipotent, pluripotent, and emerging bipotential stem cell models.

Main Results:

  • Totipotent cells possess the inherent capacity to generate an entire organism, including extraembryonic tissues.
  • Bipotential stem cells, while capable of forming multiple lineages, often lack the autonomous ability to initiate and sustain sequential fate decisions for complete organism development.
  • Emerging stem cell models exhibiting bipotentiality align more closely with the concept of plenipotency due to a loss of critical developmental timing and cell number information.

Conclusions:

  • Distinguishing plenipotency from totipotency and pluripotency is crucial for accurate scientific communication.
  • Clarifying these terms enhances our understanding of early embryonic development and stem cell behavior.
  • Refined terminology aids in addressing ethical considerations in human stem cell research.