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Cell. 1986 Apr 11;45(1):145-53.

cdc25+ functions as an inducer in the mitotic control of fission yeast.


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.

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