Error-prone nonhomologous end joining repair operates in human pluripotent stem cells during late G2
2011
Human Embryo Stem Cells and DNA Repair
Editorial
Author Information
Author(s): Marco Durante
Primary Institution: GSII Helmholtzzentrum für Schwerionenforschung
Hypothesis
Human embryonic stem cells (hESCs) are more efficient than somatic cells in DNA double-strand break (DSB) repair.
Conclusion
hESCs in G2 prefer an error-prone repair mechanism to maintain genome stability, which may lead to cell death.
Supporting Evidence
- hESCs can achieve genome stability by either effective repair or increasing apoptosis.
- Previous studies suggested hESCs use high-fidelity NHEJ for DNA repair.
- Bogomazova et al. found hESCs use error-prone NHEJ in G2-phase.
- Inhibition of DNA-PK increased chromatid breaks and decreased exchanges in hESCs.
- The study indicates hESCs prefer a 'suicide strategy' for genome stability.
Takeaway
Human stem cells have a special way of fixing their DNA when it gets damaged, but sometimes this method can lead to the cell dying.
Methodology
The study measured chromatid-type aberrations in hESCs and somatic human cells after exposure to x-rays.
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