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| Status |
Public on Mar 01, 2020 |
| Title |
Tandem CTCF sites function as insulators to balance spatial chromatin contacts and topological enhancer-promoter selection [V] |
| Organisms |
Homo sapiens; Mus musculus |
| Experiment type |
Genome binding/occupancy profiling by high throughput sequencing
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| Summary |
CTCF is a key insulator-binding protein and mammalian genomes contain numerous CTCF-binding sites (CBSs), many of which are organized in tandem arrays. Here we provide direct evidence that CBSs, if located between enhancers and promoters in the clustered Pcdh and b-globin clusters, function as an enhancer-blocking insulator by forming distinct directional chromatin loops, regardless whether enhancers contain CBS or not. Moreover, computational simulation and experimental capture revealed balanced promoter usage in vivo in cell populations and stochastic monoallelic expression in single cells by large arrays of tandem variable CBSs. Finally, gene expression levels are negatively correlated with CBS insulators located between enhancers and promoters on a genome-wide scale. Thus, single CBS insulators ensure proper enhancer insulation and promoter activation while tandem-arrayed CBS insulators determine balanced promoter choice. This finding has interesting implications on the role of topological insulators in 3D genome folding and developmental gene regulation.
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| Overall design |
ChIP profiles of P0 mouse cortex and HEC-1-B cell were seperately generated by deep sequencing using Illumina HiSeq X-ten
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| Contributor(s) |
Jia Z, Ge X, Wu Y, Wu Q |
| Citation(s) |
32293525 |
| |
| Submission date |
Oct 31, 2019 |
| Last update date |
Apr 22, 2020 |
| Contact name |
Xiao Ge |
| Organization name |
Shanghai JiaoTong University
|
| Street address |
No. 800 Dongchuan Road
|
| City |
Shanghai |
| ZIP/Postal code |
200240 |
| Country |
China |
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| Platforms (2) |
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| Samples (6)
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| This SubSeries is part of SuperSeries: |
| GSE138646 |
Tandem CTCF sites function as insulators to balance spatial chromatin contacts and topological enhancer-promoter selection |
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| Relations |
| BioProject |
PRJNA586867 |
| SRA |
SRP227845 |
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