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Erythroid specific activator GATA-1-dependent interactions between CTCF sites around the β-globin locus
Yujin Kang1, Yea Woon Kim1, Jin Kang1
1Department of Molecular Biology, College of Natural Sciences, Pusan National University, Busan 46241, Republic of Korea.
Biochimica Et Biophysica Acta. Gene Regulatory Mechanisms
|February 6, 2017
Summary
Erythroid-specific transcription factors GATA-1 and KLF1 establish tissue-specific chromatin organization by mediating interactions between CCCTC-binding factor (CTCF) sites near the β-globin locus.
Area of Science:
- Genomics and Epigenetics
- Molecular Biology
- Cellular Biology
Background:
- CCCTC-binding factor (CTCF) sites are crucial for genome organization, forming specific chromatin structures.
- CTCF site positioning and interactions are often cell type-specific, influencing gene regulation.
- The β-globin locus is a well-studied model for understanding tissue-specific gene expression and chromatin architecture.
Purpose of the Study:
- To investigate the role of erythroid-specific transcription factors GATA-1 and KLF1 in mediating chromatin organization at the β-globin locus.
- To analyze the interactions between CTCF sites in erythroid versus non-erythroid cells.
- To elucidate the molecular mechanisms by which GATA-1 and KLF1 influence CTCF site occupancy and chromatin structure.
Main Methods:
- Chromatin Conformation Capture (3C) assay to analyze 3D chromatin organization around the β-globin locus.
- Depletion of GATA-1 and KLF1 in K562 cells to assess their impact on CTCF site interactions.
- Analysis of CTCF and Rad21 occupancy at CTCF sites and LCR hypersensitive sites (HSs).
- Ectopic expression of GATA-1 in 293 cells and deletion of a GATA-1 binding site in LCR HS2 to confirm GATA-1's role.
Main Results:
- Five CTCF sites around the β-globin locus interact in erythroid K562 cells but not in non-erythroid 293 cells.
- Depletion of GATA-1 or KLF1 significantly reduced these CTCF site interactions, CTCF and Rad21 occupancy, and active chromatin structure.
- Rad21 occupancy was also reduced at β-globin locus control region (LCR) hypersensitive sites (HSs) upon GATA-1 or KLF1 depletion.
- GATA-1's role in mediating CTCF site interactions was confirmed through ectopic expression and site deletion experiments.
Conclusions:
- Erythroid-specific transcription factors GATA-1 and KLF1 are essential for establishing tissue-specific chromatin organization at the β-globin locus.
- GATA-1 and KLF1 facilitate interactions between distal CTCF sites, thereby regulating the higher-order chromatin structure.
- These findings highlight the critical role of transcription factors in coordinating chromatin architecture for cell-type-specific gene expression.
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