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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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Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
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Euchromatin01:01

Euchromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
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Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
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Polytene Chromosomes02:04

Polytene Chromosomes

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Chromosome Structure02:40

Chromosome Structure

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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
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Related Experiment Video

Updated: Jun 30, 2025

Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
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Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C

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Chromatin structure from high resolution microscopy: Scaling laws and microphase separation.

Loucif Remini1, Midas Segers2, John Palmeri1

  • 1Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS UMR5221, Montpellier, France.

Physical Review. E
|March 16, 2024
PubMed
Summary

Chromatin exists in at least two distinct structural arrangements, phase alpha (crumpled globule) and phase beta (looped domain), impacting its overall conformation and gene regulation. This finding reveals insights into chromatin organization. Keywords: chromatin structure, gene regulation, looped domain, crumpled globule

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Related Experiment Videos

Last Updated: Jun 30, 2025

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Area of Science:

  • Genomics
  • Biophysics
  • Cell Biology

Background:

  • Advanced fluorescence microscopy enables precise 3D localization of chromosomal regions.
  • Understanding chromatin conformation is crucial for gene regulation and cellular function.

Purpose of the Study:

  • To investigate chromatin conformational arrangements using microscopy data of human chromosome 21.
  • To identify distinct chromatin topologies and their scaling behaviors.

Main Methods:

  • Analysis of publicly available microscopy data from multiplexed fluorescence in situ hybridization (FISH).
  • Application of polymer physics models to analyze distance distributions between tagged genomic loci.
  • Investigation of different cell lines and treatments.

Main Results:

  • Identified two coexisting chromatin conformational arrangements, termed phase α and phase β.
  • Phase α exhibits characteristics of a crumpled globule.
  • Phase β is consistent with a confined, more extended conformation, like a looped domain.

Conclusions:

  • Chromatin can adopt multiple distinct topologies simultaneously.
  • Cellular context and treatments influence chromatin structure and phase distribution.
  • Findings provide insights into the dynamic nature of chromatin organization.