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Metal ion homeostasis regulates condensin-dependent chromatin architecture and chromosome segregation in Schizosaccharomyces pombe
Seong Ho An, Kyoung-Dong Kim
J. Microbiol. 2025;63(9):e2505008.   Published online August 29, 2025
DOI: https://doi.org/10.71150/jm.2505008
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AbstractAbstract PDFSupplementary Material

Condensin plays a central role in mitotic chromosome organization and segregation by mediating long-range chromatin interactions. However, the extent to which cellular metabolic status influences condensin function remains unclear. To gain insights into the relationship of metal ion homeostasis and the function of condensin, we conducted genome-wide chromatin immunoprecipitation sequencing (ChIP-seq) using Schizosaccharomyces pombe under iron- or zinc-deficient conditions. Under iron- or zinc-deficient conditions, ChIP-seq results revealed a selective reduction in condensin binding at high-affinity target loci, particularly genes regulated by Ace2 and Ams2, while cohesin binding remained largely unaffected. Hi-C analysis showed that iron depletion weakened chromatin interactions at these condensin targets and centromeres, without disrupting global genome architecture. DNA fluorescence in situ hybridization (FISH) confirmed that iron deficiency impaired long-range associations between centromeres and Ace2 target loci at the single-cell level. Notably, iron deficiency led to chromosome segregation defects during mitosis, suggesting that diminished condensin occupancy compromised genome stability. These changes occurred without significant alterations in condensin protein levels or global transcription, indicating a direct effect of metal ion availability on condensin activity. Collectively, our findings revealed a previously unrecognized regulatory axis in which cellular metal ion homeostasis modulated condensin-dependent chromatin organization and mitotic chromosome segregation, offering new insights into the integration of metabolic state with genome maintenance.

Journal Article
Roles of Dhh1 RNA helicase in yeast filamentous growth: Analysis of N-terminal phosphorylation residues and ATPase domains
Eunji Lee , Daehee Jung , Jinmi Kim
J. Microbiol. 2020;58(10):853-858.   Published online September 29, 2020
DOI: https://doi.org/10.1007/s12275-020-0431-7
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AbstractAbstract PDF
In yeast Saccharomyces cerevisiae, the Dhh1 protein, a member of the DEAD-box RNA helicase, stimulates Dcp2/Dcp1- mediated mRNA decapping and functions as a general translation repressor. Dhh1 also positively regulates translation of a selected set of mRNAs, including Ste12, a transcription factor for yeast mating and pseudohyphal growth. Given the diverse functions of Dhh1, we investigated whether the putative phosphorylation sites or the conserved motifs for the DEADbox RNA helicases were crucial in the regulatory roles of Dhh1 during pseudohyphal growth. Mutations in the ATPase A or B motif (DHH1-K96R or DHH1-D195A) showed significant defects in pseudohyphal colony morphology and agar invasive phenotypes. The N-terminal phospho-mimetic mutation, DHH1-T16E, showed defects in pseudohyphal phenotypes. Decreased levels of Ste12 protein were also observed in these pseudohyphal-defective mutant cells under filamentous- inducing low nitrogen conditions. We suggest that the ATPase motifs and the Thr16 phosphorylation site of Dhh1 are crucial to its regulatory roles in pseudohyphal growth under low nitrogen conditions.

Citations

Citations to this article as recorded by  
  • Roles of P-body factors in Candida albicans filamentation and stress response
    Melissa A. Tosiano, Frederick Lanni, Aaron P. Mitchell, C. Joel McManus, Guilhem Janbon
    PLOS Genetics.2025; 21(3): e1011632.     CrossRef
  • Biological implications of decapping: beyond bulk mRNA decay
    Fivos Borbolis, Popi Syntichaki
    The FEBS Journal.2022; 289(6): 1457.     CrossRef
  • The Complex Genetic Basis and Multilayered Regulatory Control of Yeast Pseudohyphal Growth
    Anuj Kumar
    Annual Review of Genetics.2021; 55(1): 1.     CrossRef

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