Unknown,Transcriptomics,Genomics,Proteomics

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A new transcription factor for mitosis: In S. pombe, the RFX transcription factor Sak1 works with forkhead factors to regulate mitotic expression (ChIP-Seq)

ABSTRACT: Many genes are transcriptionally regulated as a function of the cell cycle; genes needed for mitosis are strongly cell cycle regulated. From yeasts to humans, forkhead transcription factors are involved in mitotic gene expression. However, the mechanisms of regulation are unclear, especially since forkhead transcription factors can be activators or repressors, and often function in concert with other proteins. Here, we study mitotic regulation in the fission yeast S. pombe. We find that the forkhead transcription factor Fkh2 is a repressor of many mitotic genes, while a different forkhead transcription factor, Sep1, is an activator of a subset of these genes. The activator of the majority of mitotic genes appears to be Sak1, a transcription factor of the RFX family, which has not previously been implicated in cell cycle control. 3 test samples were analyzed; 1 control (no-tag) sample was processed (each sample has 2 replicate experiments)

ORGANISM(S): Schizosaccharomyces pombe

SUBMITTER: Angad Garg

PROVIDER: E-GEOD-60712 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Mitosis entails global alterations to chromosome structure and nuclear architecture, concomitant with transient silencing of transcription. How cells transmit transcriptional states through mitosis remains incompletely understood. While many nuclear factors dissociate from mitotic chromosomes, the observation that certain nuclear factors and chromatin features remain associated with individual loci during mitosis originated the hypothesis that they could provide transcriptional memory through mitosis. To obtain the first genome-wide view of the dynamics of chromatin structure during mitosis, we compared the DNase sensitivity of interphase and mitotic chromatin at two stages of cellular maturation in a rapidly dividingmurine erythroblastmodel. Despite global chromosome condensation visible during mitosis at the microscopic level, the chromatin accessibility landscape is largely unaltered. However, mitotic chromatin accessibility is locally dynamic, with individual loci maintaining none, some, or all of their interphase accessibility. Mitotic reduction in accessibility occurs primarily within narrow, highly hypersensitive sites that frequently coincide with transcription factor binding sites, whereas broader domains of moderate accessibility tend to be more stable. In mitosis, proximal promoters generally maintain their accessibility, whereas distal regulatory elements preferentially lose accessibility. Promoters with the highest degree of accessibility preservation in mitosis tend to also be accessible across many murine tissues in interphase. Transcription factor GATA1 exerts site-specific changes in interphase accessibility that are most pronounced at distal regulatory elements, but does not visibly influence mitotic accessibility. We conclude that features of open chromatin are remarkably stable through mitosis and are modulated at the level of individual genes and regulatory elements. Dnase-Seq data is integrated with Chip-seq [GSE36589, GSE30142] and RNA-seq to examine epigentic changes in mitosis. We performed DNase-seq on two cell lines, G1E and G1E-ER4, both on an asynchronus population, and on a sample of cells in mitosis; each of the 4 experiments in triplicate.

Dataset Information

A new transcription factor for mitosis: In S. pombe, the RFX transcription factor Sak1 works with forkhead factors to regulate mitotic expression (ChIP-Seq)

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