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Related Experiment Videos

DNA structure in sheared and unsheared chromatin.

C Nicolini, R Baserga, F Kendall

    Science (New York, N.Y.)
    |May 21, 1976
    PubMed
    Summary

    Chromatin shearing methods like sonication and homogenization create structural artifacts. These changes are detectable through ethidium bromide binding, circular dichroism, and light scattering analyses.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Chromatin structure is crucial for DNA regulation.
    • Physical methods are used to isolate chromatin for study.
    • Understanding potential artifacts is vital for accurate interpretation.

    Purpose of the Study:

    • To identify and characterize structural artifacts introduced by chromatin shearing.
    • To evaluate the reliability of common shearing techniques.

    Main Methods:

    • Chromatin samples were subjected to sonication and vortex homogenization.
    • Ethidium bromide binding assays were performed.
    • Circular dichroism (CD) spectroscopy was utilized.
    • Differential light scattering (DLS) was measured.

    Main Results:

    • Shearing significantly increased ethidium bromide binding sites, indicating DNA damage or unwinding.
    • Circular dichroism spectra showed substantial alterations post-shearing, suggesting conformational changes.
    • Differential light scattering diminished after shearing, implying loss of structural integrity.

    Conclusions:

    • Sonication and vortex homogenization introduce significant structural artifacts in chromatin.
    • These artifacts can be detected using biophysical techniques.
    • Researchers should be cautious when interpreting data from sheared chromatin samples.

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