Targeted degradation of CTCF decouples local insulation of chromosome domains from higher-order genomic compartmentalization [preprint]
AuthorsNora, Elphege P.
Gibcus, Johan H.
Mirny, Leonid A.
UMass Chan AffiliationsDepartment of Biochemistry and Molecular Pharmacology
Program in Systems Biology
topologically associating domains
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AbstractThe molecular mechanisms underlying folding of mammalian chromosomes remain poorly understood. The transcription factor CTCF is a candidate regulator of chromosomal structure. Using the auxin-inducible degron system in mouse embryonic stem cells, we show that CTCF is absolutely and dose-dependently required for looping between CTCF target sites and segmental organization into topologically associating domains (TADs). Restoring CTCF reinstates proper architecture on altered chromosomes, indicating a powerful instructive function for CTCF in chromatin folding, and CTCF remains essential for TAD organization in non-dividing cells. Surprisingly, active and inactive genome compartments remain properly segregated upon CTCF depletion, revealing that compartmentalization of mammalian chromosomes emerges independently of proper insulation of TADs. Further, our data supports that CTCF mediates transcriptional insulator function through enhancer-blocking but not direct chromatin barrier activity. These results define the functions of CTCF in chromosome folding, and provide new fundamental insights into the rules governing mammalian genome organization.
bioRxiv 095802; doi: https://doi.org/10.1101/095802. Link to preprint on bioRxiv service.
Permanent Link to this Itemhttp://hdl.handle.net/20.500.14038/29340
RightsThe copyright holder for this preprint (which was not peer-reviewed) is the author/funder. It is made available under a CC-BY-NC-ND 4.0 International license.
Except where otherwise noted, this item's license is described as The copyright holder for this preprint (which was not peer-reviewed) is the author/funder. It is made available under a CC-BY-NC-ND 4.0 International license.