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Phosphatases join kinases in DNA-damage response pathways
Christopher J Bakkenist1, Michael B Kastan
1Department of Hematology and Oncology, St Jude Children's Research Hospital, 332 North Lauderdale Street, Memphis, TN 38105, USA.
Trends in Cell Biology
|July 13, 2004
Summary
Cellular signaling relies on a balance between kinases and phosphatases. Recent studies reveal two phosphatases play key roles in DNA damage response pathways, ensuring transient cellular responses.
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- Kinase and phosphatase activity balance is crucial for cellular processes like proliferation.
- Cellular responses to DNA damage involve signal-transduction pathways with phosphorylation events.
- Reversibility of phosphorylation is essential for transient, rather than permanent, cellular responses.
Purpose of the Study:
- To investigate the roles of specific phosphatases in DNA damage signaling pathways.
- To understand how phosphatase activity contributes to the transient nature of cellular responses to DNA damage.
Main Methods:
- Analysis of signaling pathways activated after DNA damage.
- Investigating the function of two specific phosphatases within these pathways.
Main Results:
- Identified key roles for two phosphatases in DNA damage-induced signaling.
- Demonstrated the involvement of these phosphatases in regulating the reversibility of phosphorylation events.
Conclusions:
- The identified phosphatases are critical regulators of DNA damage response pathways.
- These phosphatases ensure the transient nature of cellular responses to DNA damage by reversing phosphorylation.