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Related Concept Videos

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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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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Nucleosome Remodeling02:54

Nucleosome Remodeling

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
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The Nucleosome01:19

The Nucleosome

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Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...
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The Nucleosome Core Particle01:12

The Nucleosome Core Particle

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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
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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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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging

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Chromatin structure and dynamics: one nucleosome at a time.

Diego M Presman1,2, Belén Benítez3,4, Agustina L Lafuente3

  • 1Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), Facultad de Ciencias Exactas y Naturales, CONICET-Universidad de Buenos Aires, C1428EGA, Buenos Aires, Argentina. presmandm@fbmc.fcen.uba.ar.

Histochemistry and Cell Biology
|April 12, 2024
PubMed
Summary

Single-molecule imaging reveals how DNA, epigenetic modifications, and 3D folding store genomic information. This technique advances our understanding of chromatin structure and dynamics in live cells.

Keywords:
Chromatin dynamicsChromatin structureLive-cell imagingNucleosomeSingle-molecule tracking

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Area of Science:

  • Genomics
  • Molecular Biology
  • Biophysics

Background:

  • Eukaryotic genomes store information via DNA sequence, epigenetic modifications, and 3D folding.
  • Understanding genome storage requires interdisciplinary collaboration across biology, physics, chemistry, and computer science.
  • Recent technological advancements allow high-resolution imaging of the genome.

Purpose of the Study:

  • To review how single-molecule imaging and tracking of proteins in live cells illuminate chromatin structure and dynamics.
  • To discuss the advantages and limitations of single-molecule tracking (SMT) compared to in situ imaging.
  • To explore the contribution of single-nucleosome studies to understanding chromatin dynamics and transcription.

Main Methods:

  • Single-molecule tracking (SMT) of individual proteins in live cells.
  • In situ imaging techniques for genome visualization.
  • Analysis of single-nucleosome dynamics.

Main Results:

  • SMT provides unprecedented spatial and temporal resolution of genomic elements.
  • Single-nucleosome studies enhance understanding of the link between chromatin dynamics and transcription.
  • Current models of chromatin structure are informed by these advanced imaging techniques.

Conclusions:

  • Single-molecule imaging is crucial for deciphering complex genomic information storage.
  • Further research is needed to address challenges in chromatin structure and dynamics.
  • Robert Feulgen's discovery paved the way for modern genome visualization techniques.