A novel checkpoint mechanism regulating the G1/S transition
Abstract
Ultraviolet irradiation of fission yeast cells in G1 phase induced a delay in chromatin binding of replication initiation factors and, consistently, a transient delay in S-phase entry. The cell cycle delay was totally dependent on the Gcn2 kinase, a sensor of the nutritional status, and was accompanied by phosphorylation of the translation initiation factor eIF2α and by a general depression of translation. However, the G1-specific synthesis of factors required for DNA replication was not reduced by ultraviolet radiation. The cell cycle delay represents a novel checkpoint with a novel mechanism of action that is not activated by ionizing radiation.
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Footnotes
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↵3 Corresponding author.
↵3 E-MAIL eboye@rr-research.no; FAX 47-22934580.
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Supplemental material is available at http://www.genesdev.org.
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Article is online at http://www.genesdev.org/cgi/doi/10.1101/gad.421807
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- Received December 11, 2006.
- Accepted January 31, 2007.
- Copyright © 2007, Cold Spring Harbor Laboratory Press