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We cloned the C. elegans gene ced-1, which is required for the engulfment of cells undergoing programmed cell death. ced-1 encodes a transmembrane protein similar to human SREC (Scavenger Receptor from Endothelial Cells). We showed that ced-1 is expressed in and functions in engulfing cells. The CED-1 protein localizes to cell membranes and clusters around neighboring cell corpses. CED-1 failed to...
We have identified the yeast CRT1 gene as an effector of the DNA damage and replication checkpoint pathway. CRT1 encodes a DNA-binding protein that recruits the general repressors Ssn6 and Tup1 to the promoters of damage-inducible genes. Derepression of the Crt1 regulon suppresses the lethality of mec1 and rad53 null alleles and is essential for cell viability during replicative stress. In response...
Inhibition of DNA synthesis induces transcription of DNA damage -inducible genes and prevents mitotic entry through the action of the S phase checkpoint. We have isolated a mutant, dun2, defective for both of these responses. DUN2 is identical to POL2, encoding DNA polymerase ε (pol ε). Unlike sadl mutants defective for multiple cell cycle checkpoints, pol2 mutants are defective only for the S phase...
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