Abstract
The Schizosaccharomyces pombe rad1+ gene is involved in the G2 DNA damage cell-cycle checkpoint and in coupling mitosis to completed DNA replication. It is also required for viability when the cdc17 (DNA ligase) or wee1 proteins are inactivated. We have introduced mutations into the coding regions of rad1+ by site-directed mutagenesis. The effects of these mutations on the DNA damage and DNA replication checkpoints have been analyzed, as well as their associated phenotypes in a cdc17-K42 or a wee1-50 background. For all alleles, the resistance to radiation or hydroxyurea correlates well with the degree of functioning of checkpoint pathways activated by these treatments. One mutation, rad1-S3, completely abolishes the DNA replication checkpoint while partially retaining the DNA damage checkpoint. As single mutants, the rad1-S1, rad1-S2, rad1-S5, and rad1-S6 alleles have a wild-type phenotype with respect to radiation sensitivity and checkpoint functions; however, like the rad1 null allele, the rad1-S1 and rad1-S2 alleles exhibit synthetic lethality at the restrictive temperature with the cdc17-K42 or the wee1-50 mutation. The rad1-S5 and rad1-S6 alleles allow growth at higher temperatures in a cdc17-K42 or wee1-50 background tha...Continue Reading
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