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Conserved and Diverged Functions of the Calcineurin-Activated Prz1 Transcription Factor in Fission Yeast.

Genetics. 2016 Apr;202(4):1365-75. Epub 2016 Feb 19
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摘要


Gene regulation in response to intracellular calcium is mediated by the calcineurin-activated transcription factor Prz1 in the fission yeastSchizosaccharomyces pombe Genome-wide studies of theCrz1and CrzA fungal orthologs have uncovered numerous target genes involved in conserved and species-specific cellular processes. In contrast, very few target genes of Prz1 have been published. This article identifies an extensive list of genes using transcriptome and ChIP-chip analyses under inducing conditions of Prz1, including CaCl2and tunicamycin treatment, as well as a∆pmr1genetic background. We identified 165 upregulated putative target genes of Prz1 in which the majority contained a calcium-dependent response element in their promoters, similar to that of theSaccharomyces cerevisiaeorthologCrz1 These genes were functionally enriched forCrz1-conserved processes such as cell-wall biosynthesis. Overexpression ofprz1(+)increased resistance to the cell-wall degradation enzyme zymolyase, likely from upregulation of theO-mannosyltransferase encoding geneomh1(+) Loss ofomh1(+)abrogates this phenotype. We uncovered a novel inhibitory role in flocculation for Prz1. Loss ofprz1(+)resulted in constitutive flocculation and upregulation of genes encoding the flocculins Gsf2 and Pfl3, as well as the transcription factor Cbf12. The constitutive flocculation of the∆prz1strain was abrogated by the loss ofgsf2(+)orcbf12(+) This study reveals that Prz1 functions as a positive and negative transcriptional regulator of genes involved in cell-wall biosynthesis and flocculation, respectively. Moreover, comparison of target genes betweenCrz1/CrzA and Prz1 indicate some conservation in DNA-binding specificity, but also substantial rewiring of the calcineurin-mediated transcriptional regulatory network.

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