Toward a new paradigm of cell plasticity

Area of Science:

• Developmental Biology
• Cell Biology
• Genetics

Background:

• The traditional view of development assumes unidirectional, hierarchical cell lineages with irreversible gene restrictions.
• Recent findings reveal multi-organ stem cells exhibiting true plasticity, capable of inter-organ and inter-germ layer cell transformations.
• This challenges the long-held belief in fixed cellular differentiation pathways.

Purpose of the Study:

• To propose a new paradigm of cell plasticity that accounts for observed cellular transformations.
• To introduce three guiding principles: 'genomic completeness', 'uncertainty of cell characterization', and 'stochastic nature of cell origins and fates'.
• To suggest a shift in data interpretation and hypothesis formation regarding cell potential.

Main Methods:

• Review of recent discoveries in multi-organ stem cells.
• Consideration of earlier experiments (e.g., heterokaryon formation).
• Analysis of observations of reactive and neoplastic lesions.
• Synthesis of findings to propose a new theoretical framework.

Main Results:

• Evidence supporting the existence of 'true plasticity' in adult cells.
• Identification of physiological mechanisms for reversing gene restrictions.
• Demonstration that lineage pathways are not strictly unidirectional.
• Recognition of reactive and neoplastic lesions as potential indicators of plasticity.

Conclusions:

• The established paradigm of unidirectional cell lineages requires revision.
• A new paradigm based on cell plasticity, genomic completeness, characterization uncertainty, and stochasticity is proposed.
• This new framework offers a more flexible approach to understanding adult vertebrate cell potential and guides future research.