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Related Concept Videos

Eukaryotic Compartmentalization01:37

Eukaryotic Compartmentalization

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
For example, lysosomes in the animal...
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Chromatin Packaging01:32

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, 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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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.
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Condensins02:15

Condensins

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Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
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Heterochromatin02:38

Heterochromatin

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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 that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
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Related Experiment Video

Updated: Jul 2, 2025

Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Chromosome compartmentalization: causes, changes, consequences, and conundrums.

Heng Li1, Christopher Playter1, Priyojit Das2

  • 1Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN, USA.

Trends in Cell Biology
|February 23, 2024
PubMed
Summary
This summary is machine-generated.

Genomic regions spatially segregate into compartments, influencing 3D genome organization. These compartments can switch, impacting gene regulation and cellular functions during development and disease.

Keywords:
3D genomecell differentiationchromosome compartmentsepigeneticsgene regulation

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • The genome's spatial organization into distinct compartments is crucial for cellular function.
  • Understanding the dynamics of these compartments provides insights into genome regulation.

Purpose of the Study:

  • To review the factors influencing the formation and alteration of chromosome compartments.
  • To explore the causes and implications of 'compartment switch' events in the genome.

Main Methods:

  • Review of existing data on mammalian chromosome organization.
  • Analysis of factors including epigenetic state, nuclear bodies, physical forces, gene expression, and replication timing (RT).

Main Results:

  • Compartment switching affects 20-30% of genomic regions during cell differentiation or cancer progression.
  • Even minor alterations (1-2%) can have significant biological implications.
  • Compartment changes influence gene regulation, DNA repair, replication, and cellular physical state.

Conclusions:

  • Multiple factors contribute to the dynamic nature of 3D genome organization.
  • Compartment switching is a significant phenomenon with broad functional consequences for the cell.