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A role for DNA primase in coupling DNA replication to DNA damage response
F Marini1, A Pellicioli, V Paciotti
1Dipartimento di Genetica e di Biologia dei Microrganismi, Università degli Studi di Milano, Italy.
The EMBO Journal
|February 3, 1997
Summary
The yeast DNA primase mutant pri1-M4 shows sensitivity to DNA damage and cell cycle defects. This suggests DNA primase is crucial for specific DNA damage checkpoint pathways.
Area of Science:
- Molecular Biology
- Cell Cycle Regulation
- DNA Replication
Background:
- DNA primase is essential for initiating DNA replication.
- Cell cycle checkpoints safeguard genome integrity during DNA damage.
- The Rad53p pathway is a key DNA damage response in yeast.
Purpose of the Study:
- To investigate the role of yeast DNA primase in DNA damage response.
- To characterize the cell cycle behavior of the temperature-sensitive pri1-M4 mutant.
- To determine the involvement of DNA primase in Rad53p-dependent checkpoints.
Main Methods:
- Utilized a temperature-sensitive yeast mutant (pri1-M4) defective in DNA primase.
- Assessed S phase progression and G1-S transition delays following DNA damage.
- Examined G2 DNA damage response and S-M checkpoint coupling.
- Analyzed Rad53p phosphorylation and its relation to cell cycle delay.
Main Results:
- The pri1-M4 mutant exhibited sensitivity to DNA-damaging agents and failed early DNA replication steps.
- pri1-M4 mutants were deficient in S phase slowing and G1-S delay upon DNA damage.
- G2 damage response and S-M checkpoint completion were unaffected.
- Rad53p phosphorylation was proficient, and pri1-M4 counteracted Rad53p-induced cell cycle delay.
Conclusions:
- DNA primase is essential for specific Rad53p-dependent cell cycle checkpoints.
- The pri1-M4 mutation influences checkpoint pathways controlling cell cycle progression after DNA damage.
- DNA primase plays a critical role in coordinating replication and cell cycle arrest.