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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Regenerative Medicine

Background:

  • Multicellular organisms rely on cell replenishment for homeostasis and repair.
  • Traditional views emphasize unidirectional differentiation from resident stem cells for tissue renewal.

Purpose of the Study:

  • To challenge the stem cell-centric model of tissue renewal.
  • To highlight the role of cell plasticity and palingenesis in regeneration.
  • To propose a new classification framework for cell proliferation patterns.

Main Methods:

  • Review of emerging technologies, including single-cell RNA sequencing.
  • Analysis of cell plasticity and palingenesis mechanisms.
  • Conceptual framework development for cell proliferation.

Main Results:

  • Cell plasticity, the adaptive change in cell differentiation state or identity, is a central mechanism for tissue renewal.
  • Mature cells can utilize palingenesis to reenter the cell cycle and regenerate damaged tissue, especially in tissues lacking dedicated stem cells.
  • Cell plasticity, while beneficial for regeneration, poses cancer risks due to accumulated mutations during cyclical proliferation and redifferentiation.

Conclusions:

  • Tissue renewal is a multifaceted process involving cell plasticity beyond traditional stem cell differentiation.
  • Understanding cell plasticity and palingenesis is crucial for regenerative medicine and cancer research.
  • A revised framework is needed to encompass the diverse strategies adult tissues use for cell proliferation and regeneration.