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Related Experiment Videos

Chromatin: a tunable spring at work inside chromosomes.

E Ben-Haïm1, A Lesne, J M Victor

  • 1Laboratoire de Physique Théorique des Liquides, Université Pierre et Marie Curie, Case Courrier 121, 4 Place Jussieu, 75252 Paris Cedex 05, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 12, 2001
PubMed
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The 30-nm chromatin fiber

Area of Science:

  • Biophysics
  • Molecular Biology
  • Genetics

Background:

  • Chromatin, the complex of DNA and proteins, plays a crucial role in genome organization and gene regulation.
  • Understanding the mechanical properties of chromatin fibers is essential for elucidating their biological functions.
  • The 30-nm chromatin fiber represents a higher-order structure of DNA packaging.

Purpose of the Study:

  • To determine the complete set of elastic constants for the 30-nm chromatin fiber.
  • To investigate the relationship between DNA elastic properties, fiber geometry, and chromatin mechanics.
  • To explore the impact of linker DNA length on the fiber's elasticity and its potential role in gene regulation.

Main Methods:

  • Geometric modeling of chromatin assembly.

Related Experiment Videos

  • Calculation of elastic constants (persistence lengths, stretch modulus, twist-stretch coupling).
  • Application of the extensible wormlike rope model for force-extension curve prediction.

    • Main Results:

    • Elastic constants of the 30-nm fiber are derived from DNA and fiber assembly properties.
    • Fiber elasticity is highly sensitive to linker DNA length, with potential for significant local flexibility and extensibility.
    • The twist-stretch coupling constant shows dramatic variations and sign changes with linker length, indicating tunable chirality.

    Conclusions:

    • The tunable elasticity of the 30-nm chromatin fiber, particularly its chirality, may be critical for biological functions.
    • Variations in linker length can lead to significant changes in chromatin mechanics, influencing DNA accessibility.
    • This mechanical flexibility likely plays a role in processes such as transcription initiation and regulation.