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Related Experiment Videos

Heterogeneity in nucleosome spacing

D Z Martin, R D Todd, D Lang

    The Journal of Biological Chemistry
    |November 25, 1977
    PubMed
    Summary
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    Chromatin structure involves repeating units with variable spacer DNA lengths. Longer spacers in polynucleosomes lead to faster processing by micrococcal nuclease, suggesting functional roles for spacer organization.

    Area of Science:

    • Molecular Biology
    • Chromatin Structure
    • Biochemistry

    Background:

    • Chromatin is the complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells.
    • Polynucleosomes are repeating units of chromatin, consisting of DNA cores and linker DNA (spacer DNA).

    Purpose of the Study:

    • To investigate the organization and variability of spacer DNA in bovine thymus polynucleosomes.
    • To understand the relationship between spacer DNA length and chromatin processing.

    Main Methods:

    • Biochemical techniques
    • Electron microscopy
    • Micrococcal nuclease digestion

    Main Results:

    • A spectrum of repeating chromatin units was observed, differing in spacer DNA length by up to 20 base pairs.

    Related Experiment Videos

  • Polynucleosomes with longer spacer DNA were processed more rapidly by micrococcal nuclease.
  • Nearest neighbor spacers frequently shared common DNA lengths despite overall distribution.

    • Conclusions:

    • Spacer DNA length in chromatin is variable and organized in a non-random manner.
    • Spacer DNA length influences the rate of chromatin processing, suggesting functional implications.
    • The organization of spacer DNA along chromatin fibers may play a role in chromatin function.