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Related Concept Videos

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.
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DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to 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.
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Chromatin Packaging01:32

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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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Chromatin Packaging02:21

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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? 
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Related Experiment Video

Updated: Feb 28, 2026

Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA
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Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA

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Nucleosomal organization and DNA base composition patterns.

Alicia García1, Sara González1, Francisco Antequera1

  • 1a Instituto de Biología Funcional y Genómica, Consejo Superior de Investigaciones Científicas (CSIC)/Universidad de Salamanca , Salamanca , Spain.

Nucleus (Austin, Tex.)
|June 22, 2017
PubMed
Summary

DNA sequence significantly influences nucleosome positioning within the genome. This finding allows for the design of synthetic DNA to create specific, species-tailored nucleosome patterns in vivo.

Keywords:
base compositionchromatinevolutiongenome organizationnucleosome

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Nucleosomes are fundamental chromatin units, compacting DNA and regulating protein access.
  • While some DNA sequence elements affect histone-DNA affinity, their role in genomic nucleosome positioning is not fully understood.
  • Nucleosome positioning is largely conserved in yeast across various conditions.

Purpose of the Study:

  • To investigate the extent to which DNA sequence dictates nucleosome positioning in a genomic context.
  • To explore species-specific differences in DNA sequence impact on nucleosome positioning.
  • To determine if synthetic DNA can be engineered to control nucleosome organization.

Main Methods:

  • Analysis of base composition patterns in mononucleosomal DNA across species.
  • Comparative studies on the impact of conserved sequence elements on nucleosome positioning in different genomes.
  • Design and in vivo testing of synthetic DNA molecules for controlled nucleosome formation.

Main Results:

  • Significant differences in mononucleosomal DNA base composition exist between species.
  • Conserved DNA sequence elements have varying effects on nucleosome positioning across different genomes.
  • Synthetic DNA molecules can successfully generate regular, species-specific nucleosomal patterns in vivo.

Conclusions:

  • DNA sequence is a critical determinant of nucleosome positioning, beyond simple histone-DNA binding preferences.
  • The impact of DNA sequence on nucleosome positioning is species-specific, despite conserved histone proteins.
  • Engineered DNA sequences offer a powerful tool for precise control over chromatin structure and function.