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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Related Experiment Video

Updated: Mar 18, 2026

Chromatin Interaction Analysis with Paired-End Tag Sequencing ChIA-PET for Mapping Chromatin Interactions and Understanding Transcription Regulation
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A functional overlap between actively transcribed genes and chromatin insulator elements.

Lucy J Cornell1, Caroline L Harrold1, Susannah Holliman1

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|March 17, 2026
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Summary
This summary is machine-generated.

The alpha-globin gene, not CTCF insulators, defines boundaries in genome architecture. Actively transcribed DNA segments can impede gene expression and bind cohesin, revealing functional overlaps in genome organization.

Keywords:
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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Mammalian genomes feature topologically associating domains (TADs) and sub-TADs, crucial for gene regulation.
  • Cohesin-mediated loop extrusion, often defined by CTCF insulators, shapes these structures.
  • Previous work identified CTCF sites delimiting alpha-globin locus loops during erythroid differentiation.

Purpose of the Study:

  • To investigate the downstream boundary of the alpha-globin sub-TAD.
  • To determine the role of CTCF sites versus transcriptional activity in defining genome structure boundaries.

Main Methods:

  • Deletion of CTCF binding sites within the alpha-globin locus.
  • Analysis of cohesin binding and gene expression following CTCF site removal.
  • Insertion of transcribed DNA fragments to assess their impact on gene regulation.

Main Results:

  • The alpha-globin gene itself, rather than CTCF insulators, acts as the downstream boundary of the sub-TAD.
  • Removing CTCF sites did not disrupt the boundary.
  • Inserting transcribed alpha-globin gene fragments reduced native gene expression and caused cohesin accumulation.

Conclusions:

  • Transcriptional activity plays a critical role in defining genome structure boundaries.
  • There is a functional overlap between gene regulatory elements and structural boundary elements in the genome.
  • Cohesin's role extends beyond loop extrusion to potentially mediating interactions with transcribed regions.