Checkpoint functions are required for normal S-phase progression in Saccharomyces cerevisiae RCAF- and CAF-I-defective mutants.

The chromatin-assembly factor I (CAF-I) and the replication-coupling assembly factor (RCAF) complexes function in chromatin assembly during DNA replication and repair and play a role in the maintenance of genome stability. Here, we have investigated their role in checkpoints and S-phase progression. FACS analysis of mutants lacking Asf1 or Cac1 ...
as well as various checkpoint proteins indicated that normal rates of S-phase progression in asf1 mutants have a strong requirement for replication checkpoint proteins, whereas normal S-phase progression in cac1 mutants has only a weak requirement for either replication or DNA-damage checkpoint proteins. Furthermore, asf1 mutants had high levels of Ddc2.GFP foci that were further increased in asf1 dun1 double mutants consistent with a requirement for checkpoint proteins in S-phase progression in asf1 mutants, whereas cac1 mutants had much lower levels of Ddc2.GFP foci that were not increased by a dun1 mutation. Our data suggest that RCAF defects lead to unstable replication forks that are then stabilized by replication checkpoint proteins, whereas CAF-I defects likely cause different types of DNA damage.
Mesh Terms:
Cell Cycle Proteins, Chromatin Assembly Factor-1, Chromosomal Proteins, Non-Histone, DNA Damage, DNA Replication, DNA-Binding Proteins, Genes, Fungal, Hydroxyurea, Methyl Methanesulfonate, Models, Biological, Molecular Chaperones, Mutation, Phosphorylation, Protein-Serine-Threonine Kinases, S Phase, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins
Proc. Natl. Acad. Sci. U.S.A.
Date: Mar. 07, 2006
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