How RPA2 Hyperphosphorylation Affects DNA Repair
Author Information
Author(s): Liaw Hungjiun, Lee Deokjae, Myung Kyungjae
Primary Institution: National Human Genome Research Institute, National Institutes of Health
Hypothesis
What types of DNA lesions cause RPA2 hyperphosphorylation, which kinase(s) are responsible for them, and what is the biological outcome of these phosphorylations?
Conclusion
RPA2 hyperphosphorylation by DNA-PK in response to DNA double-strand breaks blocks unscheduled homologous recombination and delays mitotic entry.
Supporting Evidence
- RPA2 hyperphosphorylation occurs primarily in response to genotoxic stresses that cause high levels of DNA double-strand breaks.
- DNA-PK is responsible for the modifications of RPA2 in vivo.
- Alteration of RPA2 to prevent phosphorylation at specific sites caused increased mitotic entry and homologous recombination.
Takeaway
When cells get damaged, a protein called RPA2 gets a special tag that helps fix the damage and makes sure the cell doesn't divide too soon.
Methodology
The study involved treating HEK293T cells with various DNA damaging agents and monitoring RPA2 phosphorylation.
Statistical Information
P-Value
p<0.0001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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