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1 Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA; 2 Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
Transcription patterns shift dramatically as cells transit from one phase of the cell cycle to another. To better define this transcriptional circuitry, we collected new microarray data across the cell cycle of budding yeast. The combined analysis of these data with three other cell cycle data sets identifies hundreds of new highly periodic transcripts and provides a weighted average peak time for each transcript. Using these data and phylogenetic comparisons of promoter sequences, we have identified a late S-phase-specific promoter element. This element is the binding site for the forkhead protein Hcm1, which is required for its cell cycle-specific activity. Among the cell cycle-regulated genes that contain conserved Hcm1-binding sites, there is a significant enrichment of genes involved in chromosome segregation, spindle dynamics, and budding. This may explain why Hcm1 mutants show 10-fold elevated rates of chromosome loss and require the spindle checkpoint for viability. Hcm1 also induces the M-phase-specific transcription factors FKH1, FKH2, and NDD1, and two cell cycle-specific transcriptional repressors, WHI5 and YHP1. As such, Hcm1 fills a significant gap in our understanding of the transcriptional circuitry that underlies the cell cycle.
[Keywords: Hcm1; cell cycle; transcription; genome stability; forkhead; yeast]
Received May 18, 2006; revised version accepted June 21, 2006.
4 E-MAIL lbreeden{at}fhcrc.org; FAX (206) 667-6526.
5 E-MAIL noble{at}gs.washington.edu; FAX (206) 685-7301.
Supplemental material is available at http://www.genesdev.org.
Article is online at http://www.genesdev.org/cgi/doi/10.1101/gad.1450606.
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