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Identifying DNA Mutations in Purified Hematopoietic Stem/Progenitor Cells
Published on: February 24, 2014
Decatenation checkpoint deficiency in stem and progenitor cells
Marc Damelin1, Yi E Sun, Veronika Brundula Sodja
1Department of Genetics and Development, College of Physicians and Surgeons of Columbia University, New York, New York 10032, USA.
Cancer Cell
|December 13, 2005
Summary
The decatenation checkpoint, crucial for disentangling chromosomes, is inefficient in undifferentiated stem and progenitor cells. This deficiency leads to aneuploidy and may increase chromosome aberrations in these cells.
Area of Science:
- Cell Biology
- Genetics
- Developmental Biology
Background:
- The decatenation checkpoint prevents cell division until chromosomes are fully disentangled by topoisomerase II.
- Chromosome entanglement can lead to genomic instability.
Purpose of the Study:
- To investigate the efficiency of the decatenation checkpoint in various progenitor and stem cell types.
- To determine if differentiation impacts decatenation checkpoint function.
Main Methods:
- Analysis of decatenation checkpoint efficiency in mouse embryonic stem cells, mouse neural progenitor cells, and human CD34+ hematopoietic progenitor cells.
- Assessment of checkpoint efficiency following induced differentiation of embryonic stem cells.
Main Results:
- The decatenation checkpoint was found to be highly inefficient in all tested undifferentiated progenitor and stem cell types.
- Checkpoint efficiency significantly improved upon induced differentiation of embryonic stem cells.
- Embryonic stem cells underwent cell division with entangled chromosomes, resulting in severe aneuploidy in daughter cells.
Conclusions:
- The decatenation checkpoint deficiency is a characteristic of the undifferentiated state in these cell types.
- This inefficiency likely contributes to increased rates of chromosome aberrations in stem cells, progenitor cells, and cancer stem cells.
- The findings highlight a potential mechanism for genomic instability in rapidly dividing undifferentiated cells.
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