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Related Concept Videos

Chromatin Packaging02:21

Chromatin Packaging

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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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Maslow's Need Hierarchy Theory01:27

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Abraham Maslow's theory of motivation, introduced in 1943, is widely known as the "Hierarchy of Needs." This theory posits that human needs are arranged in a hierarchical structure, starting with basic survival needs and progressing toward more complex psychological and self-fulfillment desires. The hierarchy is typically a pyramid, and the lower needs must be satisfied to reach the next level.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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The writer...
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Inheritance of Chromatin Structures03:17

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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: Feb 13, 2026

Chromatin Interaction Analysis with Paired-End Tag Sequencing ChIA-PET for Mapping Chromatin Interactions and Understanding Transcription Regulation
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Dissecting super-enhancer hierarchy based on chromatin interactions.

Jialiang Huang1,2, Kailong Li3, Wenqing Cai2

  • 1Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute and Harvard T.H. Chan School of Public Health, Boston, MA, 02215, USA.

Nature Communications
|March 7, 2018
PubMed
Summary
This summary is machine-generated.

Hub enhancers are key components of super-enhancers (SEs), regulating gene expression and chromatin structure. These crucial elements, identified through Hi-C and ChIP-seq analysis, are vital for SE organization and function.

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The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin
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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Super-enhancers (SEs) are critical for gene regulation but their internal organization and properties are not fully understood.
  • Understanding SE structure is essential for deciphering gene expression control.

Purpose of the Study:

  • To investigate the hierarchical organization of super-enhancers.
  • To identify the specific roles of different enhancer types within SEs.

Main Methods:

  • Integrative analysis of Hi-C and ChIP-seq data.
  • Characterization of enhancer properties, including histone modifications, transcription factor binding, and cohesin/CTCF association.
  • Genetic ablation experiments to assess functional impact.

Main Results:

  • A significant portion of SEs exhibit hierarchical organization, comprising hub and non-hub enhancers.
  • Hub enhancers are distinguished by their association with cohesin and CTCF binding sites and disease-associated genetic variants.
  • Hub enhancers play a critical role in SE functional and structural organization, impacting gene activation and chromatin landscape.

Conclusions:

  • Hub enhancers are the primary drivers of super-enhancer structure and function.
  • The hierarchical organization of SEs, with distinct roles for hub enhancers, is crucial for precise gene regulation.