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Updated: Sep 27, 2025

Formaldehyde-assisted Isolation of Regulatory Elements to Measure Chromatin Accessibility in Mammalian Cells
Published on: April 2, 2018
Regulatory elements can be essential for maintaining broad chromatin organization and cell viability
Ying Liu1, Bo Ding2, Lina Zheng3
1Biomedical Pioneering Innovation Center, Beijing Advanced Innovation Center for Genomics, Peking-Tsinghua Center for Life Sciences, Peking University Genome Editing Research Center, State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China.
Active promoters and enhancers, known as hotspots, are crucial for maintaining broad chromatin organization and cell fitness. Their essentiality arises from regulating multiple non-essential genes, impacting cell survival.
Area of Science:
- Genomics
- Epigenetics
- Molecular Biology
Background:
- Promoters and enhancers influence cellular functions through 3D chromatin structure.
- Their role in broad chromatin organization, beyond canonical loops, is understudied.
Purpose of the Study:
- Investigate the role of active promoter/enhancer hotspots in maintaining broad chromatin organization.
- Identify essential loci for cell growth and survival related to these hotspots.
Main Methods:
- CRISPR screening to identify essential loci.
- Analysis of 3D chromatin contacts and gene expression changes upon hotspot deletion.
Main Results:
- Dozens of essential loci were identified as hotspots.
- Deletion of essential hotspots altered broad chromatin organization and distal gene expression.
- Hotspot essentiality is linked to synergistic effects on multiple non-essential genes, impacting cell fitness.
Conclusions:
- Active promoter/enhancer hotspots are critical for maintaining genome organization and cell viability.
- These hotspots regulate cell fitness through coordinated effects on multiple genes, not just single essential genes.
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