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Expression data of synchronised primary human fibroblasts (NHDF, Data Set 3)

ABSTRACT: Transcriptional programmes involved in the eukaryotic cell cycle are activated sequentially throughout the process. In particular, the set of genes required for S and G2-M phases are highly conserved and induced one after the other. We used gene expression microarrays to analyse the global programme of gene expression of human primary fibroblasts from a quiescence state (G0) to a synchronised cell proliferation

ORGANISM(S): Homo sapiens

PROVIDER: GSE104618 | GEO | 2018/10/01

REPOSITORIES: GEO

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Expression data from fission yeast deletion mutant of Klf1, a C2H2 zinc finger-transcription factor, in G0 and VE phases

Project description:Fission yeast Schizosaccharomyces pombe is a model for studying cellular quiescence. Shifting to medium without a nitrogen-source induces proliferative cells to enter long-term G0 quiescence. Klf1 is a Kruppel-like transcription factor with a 7-amino acid-spaced C2H2-type zinc finger motif. The deletion mutant M-bM-^HM-^Fklf1 normally divides in vegetative medium, but proliferation is not restored after long-term G0 quiescence. Cell biologic, transcriptomic, and metabolomic analyses revealed a unique phenotype of the M-bM-^HM-^Fklf1 mutant in quiescence. Mutant cells had diminished transcripts related to signaling molecules for switching to differentiation. In contrast, proliferative metabolites for cell-wall assembly and antioxidants significantly increased. Further, the size of the M-bM-^HM-^Fklf1 cells is markedly increased during quiescence due to the aberrant accumulation of calcofluor-positive chitin-like materials beneath the cell wall. After 4 weeks quiescence, the ability for reversible proliferation is lost, but energy metabolism is maintained. Klf1 thus plays a role in G0 phase longevity through enhancing the differentiation signal and suppressing metabolism for growth. If Klf1 is lost, S. pombe fails to maintain a constant cell size during quiescence. Gene expression profile of fission yeast wild type cells and klf1-gene disruptant cells in proliferating state and in quiescent state. Type of experiment: Comparing between wild type cells and klf1-gene disruptant cells in proliferating condition and in quiescent condition. Experimental factor: Exponentially proliferating state in synthetic medium, EMM2, and quiescent G0 state in nitrogen-depleted synthetic medium, EMM2-N. Quality control steps taken: All experiments were repeated twice in each condition.

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