A yeast gene essential for regulation of spindle pole duplication

In eucaryotic cells, duplication of spindle poles must be coordinated with other cell cycle functions. We report here the identification in Saccharomyces cerevisiae of a temperature-sensitive lethal mutation, esp1, that deregulates spindle pole duplication. Mutant cells transferred to the nonpermissive temperature became unable to continue DNA synthesis and cell division but displayed repeated duplication of their spindle pole bodies. Although entry into this state after transient challenge by the nonpermissive temperature was largely lethal, rare survivors were recovered and found to have become increased in ploidy. If the mutant cells were held in G0 or G1 during exposure to the elevated temperature, they remained viable and maintained normal numbers of spindle poles. These results suggest dual regulation of spindle pole duplication, including a mechanism that promotes duplication as cells enter the division cycle and a negative regulatory mechanism, controlled by ESP1, that limits duplication to a single occurrence in each cell division cycle. Tetrad analysis has revealed that ESP1 resides at a previously undescribed locus on the right arm of chromosome VII.

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