Reference: Kats ES, et al. (2006) Checkpoint functions are required for normal S-phase progression in Saccharomyces cerevisiae RCAF- and CAF-I-defective mutants. Proc Natl Acad Sci U S A 103(10):3710-5

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Abstract


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.

Reference Type
Journal Article | Research Support, N.I.H., Extramural
Authors
Kats ES, Albuquerque CP, Zhou H, Kolodner RD
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