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Chromatin Packing Domain Engineering Through the Manipulation of Nuclear Cationic States
Cody L Dunton1,2, Carrillo Paola Gonzalez1,2,3, Luay Almassalha4
1Department of Biomedical Engineering, Northwestern University, Evanston, Illinois, USA.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 13, 2026
Summary
Nuclear ions rapidly control cell memory by altering chromatin structure. Manipulating these ions impacts gene expression and cellular adaptation, offering new insights into genome organization and disease resilience.
Area of Science:
- Cell Biology
- Biophysics
- Genomics
Background:
- Cellular identity and stress adaptation rely on transcriptional memory, a process influenced by genome geometry.
- Chromatin packing domains (PDs) are key structural units for transcriptional memory.
- The nuclear ionic environment is an underexplored regulator of chromatin architecture.
Purpose of the Study:
- To investigate the role of nuclear divalent cations in regulating chromatin architecture and transcriptional memory.
- To determine if manipulating nuclear ions can alter cellular resilience and adaptation.
Main Methods:
- Live-cell nanoscopy to observe chromatin packing dynamics.
- Transcriptomic profiling to assess gene expression changes.
- Chemical manipulation of nuclear divalent cations (e.g., BAPTA-AM, magnesium enrichment).
Main Results:
- Selective cation depletion resulted in smaller, less compact PDs and diminished heterochromatic cores.
- Magnesium enrichment increased chromatin packing density and domain maturation.
- Ionic perturbations rapidly altered chromatin packing, gene expression, and cellular adaptive plasticity, increasing chemotherapy sensitivity.
Conclusions:
- Nuclear ions are identified as rapid, reversible regulators of chromatin packing domains and transcriptional memory.
- Ionic homeostasis is a fundamental mechanism linking genome architecture to cellular adaptation.
- Targeting nuclear ion levels may offer therapeutic strategies for cancer treatment.
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