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Dissection of a CTCF topological boundary uncovers principles of enhancer-oncogene regulation

ABSTRACT: Dissection of a CTCF topological boundary uncovers principles of enhancer-oncogene regulation

PROVIDER: PRJNA1010760 | ENA |

REPOSITORIES: ENA

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Dissection of a CTCF topological boundary uncovers principles of enhancer-oncogene regulation

Project description:This SuperSeries is composed of the SubSeries listed below.

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In vivo dissection of a clustered-CTCF domain boundary reveals developmental principles of regulatory insulation [ChIPmentation]

Project description:Vertebrate genomes organize into topologically associating domains (TADs), delimited by boundaries that insulate regulatory elements from non-target genes. However, how boundary function is established is not well understood. Here, we combine genome-wide analyses and transgenic mouse assays to dissect the regulatory logic of clustered-CTCF boundaries in vivo, interrogating their function at multiple levels: chromatin interactions, transcription and phenotypes. Individual CTCF binding sites (CBS) deletions revealed that the characteristics of specific sites can outweigh other factors like CBS number and orientation. Combined deletions demonstrated that CBS cooperate redundantly and provide boundary robustness. We show that divergent CBS signatures are not strictly required for effective insulation and that chromatin loops can be formed by non-canonically oriented sites, which suggests a loop interference mechanism. Further, we observe that insulation strength constitutes an effective modulator of gene expression and phenotypes. Our results highlight the modular nature of boundaries and their control over developmental processes.

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