Stem sense: a proposal for the classification of stem cells

Area of Science:

• Developmental Biology
• Regenerative Medicine
• Stem Cell Biology

Background:

• Stem cells offer significant potential for developmental studies and therapeutic applications.
• Current definitions of stem cells are ambiguous, leading to a proliferation of poorly defined cell types.
• Field fragmentation and controversy stem from a lack of common standards and a shared forum for discussion.

Purpose of the Study:

• To propose a framework for stratifying and classifying stem cells based on function, characteristics, and capabilities.
• To address the challenges posed by inconsistent nomenclature and definitions in stem cell research.
• To facilitate progress and resolve controversies within the stem cell community.

Main Methods:

• Conceptual analysis of existing stem cell definitions and classifications.
• Identification of the need for standardized nomenclature and stratification criteria.
• Illustrative examples demonstrating the impact of definitional ambiguity on research progress.

Main Results:

• The absence of uniform stem cell definitions hinders generalization across different systems and cell types.
• Contradictory claims regarding stem cell abilities arise from a lack of standardized terminology.
• Progress in the field is demonstrably slowed by definitional inconsistencies.

Conclusions:

• A consensus on the definition of tissue-specific stem cells and a robust classification system are essential.
• Standardization will greatly benefit the scientific community by facilitating communication and collaboration.
• Establishing clear criteria will aid in resolving existing controversies and accelerating stem cell research.