DNA Repair and Survival Advantage in Planarian Stem Cells
Author Information
Author(s): Hollenbach Jessica P., Resch Alissa M., Palakodeti Dasaradhi, Graveley Brenton R., Heinen Christopher D.
Primary Institution: University of Connecticut Health Center
Hypothesis
Does loss of DNA mismatch repair provide pre-cancerous stem cells a selective advantage?
Conclusion
Loss of DNA mismatch repair provides an in vivo survival advantage to planarian stem cells in the presence of DNA damage.
Supporting Evidence
- Planarians lacking MMR were more tolerant to DNA damage than control animals.
- Smed-msh2(RNAi) animals showed increased survival with a marked delay in death after DNA damage.
- Loss of MMR provided adult stem cells with a survival advantage in a cytotoxic environment.
Takeaway
When planarians lose a specific DNA repair function, they can survive better when exposed to harmful substances that damage their DNA.
Methodology
Planarians were treated with RNA interference to deplete Smed-msh2 and then exposed to DNA damaging agents to assess survival and regeneration.
Limitations
The study did not observe long-term tumor formation in Smed-msh2(RNAi) animals, which may limit the understanding of the implications of MMR loss.
Participant Demographics
Asexual and sexual strains of Schmidtea mediterranea planarians were used.
Statistical Information
P-Value
0.024
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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