title: cdc25+ functions as an inducer in the mitotic control of fission yeast.
abstract: In the fission yeast S. pombe the cdc25+ gene function is required to initiate mitosis. We have cloned the cdc25+ gene and have found that increased cdc25+ expression causes mitosis to initiate at a reduced cell size. This shows that cdc25+ functions as a dosage-dependent inducer in mitotic control, the first such mitotic control element to be specifically identified. DNA sequencing of the cdc25+ gene has shown that it can encode a protein of MW 67,000. Evidence is described showing that cdc25+ functions to counteract the activity of the mitotic inhibitor wee1+, and indicating that both mitotic control elements act independently to regulate the initiation of mitosis.
mesh_terms: D001483:Base Sequence; D002453:Cell Cycle; D003001:Cloning, Molecular; D005786:Gene Expression Regulation; D005800:Genes, Fungal; D008938:Mitosis; D004718:Saccharomycetales / Q000166:cytology*; D012568:Schizosaccharomyces / Q000166:cytology* / Q000235:genetics; D013997:Time Factors