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Clonal diversity of the stem cell compartment.
Christa E Muller-Sieburg1, Hans B Sieburg
1Sidney Kimmel Cancer Center, 10835 Road to the Cure, San Diego, California 92112, USA.
Current Opinion in Hematology
|June 7, 2006
Summary
Hematopoietic stem cells (HSCs) possess preprogrammed functions, not adaptable ones. This means stem cell diversity arises from distinct cell classes, not individual cell modification.
Area of Science:
- Hematology
- Stem Cell Biology
- Epigenetics
Background:
- Hematopoietic stem cells (HSCs) exhibit functional heterogeneity despite phenotypic homogeneity.
- Existing models propose extrinsic or intrinsic signals drive HSC diversity, suggesting adaptability.
Purpose of the Study:
- To review recent findings challenging the adaptability model of HSCs.
- To discuss the implications of preprogrammed HSC function for stem cell applications.
Main Methods:
- Literature review of recent studies on HSC heterogeneity.
- Analysis of data on functional differences and inheritance in HSCs.
Main Results:
- Functional differences in HSCs are stably inherited during self-renewal.
- The adult HSC compartment comprises a limited number of distinct stem cell classes.
- Evidence suggests HSC functions are preprogrammed via epigenetic or genetic mechanisms.
Conclusions:
- Stem cell functions like self-renewal and differentiation are preprogrammed.
- HSCs are more predictable than previously assumed.
- Changes in HSCs during aging or disease reflect shifts in clonal composition, not individual cell modification.