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Chromatin dynamics in interphase nuclei and its implications for nuclear structure

J R Abney1, B Cutler, M L Fillbach

  • 1Department of Physics, Lewis & Clark College, Portland, Oregon 97219, USA.

The Journal of Cell Biology
|June 30, 1997
PubMed
Summary

Interphase chromatin in living cells is largely immobile, persisting in distinct domains over long timescales. This immobility suggests chromatin is confined within the nucleus, possibly attached to structures like the nuclear matrix.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Understanding chromatin dynamics is crucial for comprehending nuclear organization and function.
  • Previous studies have suggested dynamic chromatin, but direct observation of immobility at specific scales is needed.

Purpose of the Study:

  • To investigate the translational dynamics of chromatin in living interphase nuclei.
  • To determine the mobility of chromatin over defined spatial scales and timescales.

Main Methods:

  • Utilized fluorescence microscopy and fluorescence recovery after photobleaching (FRAP) in Swiss 3T3 and HeLa cells.
  • Chromatin was labeled with dihydroethidium, and specific regions (heterochromatin and euchromatin) were photobleached with a laser.
  • Compared results with ethidium homodimer-1 to differentiate chromatin-bound versus free dye motion.

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Main Results:

  • Photobleached spots (0.4 microm radius) in both heterochromatin and euchromatin remained persistent for over 1 hour, indicating immobility.
  • A minor, rapid fluorescence recovery (<1 second) was attributed to independent movement of the dihydroethidium dye.
  • Chromatin demonstrated immobility at scales greater than or equal to 0.4 micrometers.

Conclusions:

  • Interphase chromatin is largely immobile over significant distances within the nucleus.
  • This immobility supports models of chromosome confinement within nuclear domains.
  • Potential mechanisms for immobility include steric hindrance in the dense nuclear environment or attachment to nuclear substructures (nucleoli, lamina, matrix).