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Multi-scale tracking reveals scale-dependent chromatin dynamics after DNA damage.

Judith Miné-Hattab1,2,3, Vincent Recamier4, Ignacio Izeddin4,5

  • 1Institut de Biologie de l'Ecole Normale Supérieure (IBENS), Paris 75005, France darzacq@berkeley.edu judith.mine@curie.fr rothstein@columbia.edu.

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Summary

DNA damage alters how genes move within the nucleus. Following DNA breaks, chromatin becomes more mobile over longer times but less mobile over shorter times, a change regulated by the Rad51 repair protein.

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Area of Science:

  • Cell Biology
  • Genetics
  • Biophysics

Background:

  • The spatial organization of genes within the nucleus is crucial for their regulation and function.
  • Understanding DNA dynamics and chromatin mobility is key to deciphering nuclear processes.

Purpose of the Study:

  • To quantify DNA motion in Saccharomyces cerevisiae (S. cerevisiae) at various time scales.
  • To investigate how DNA damage, specifically double-strand breaks, affects chromatin dynamics.
  • To elucidate the role of the Rad51 repair protein in regulating DNA motion post-damage.

Main Methods:

  • Utilized fast DNA tracking microscopy in S. cerevisiae.
  • Employed advanced analysis of mean square displacements to analyze DNA motion.
  • Quantified DNA motion across time scales from milliseconds to minutes.

Main Results:

  • DNA damage induces distinct sub-diffusive regimes in chromatin motion.
  • Chromatin mobility increases at large time scales but decreases at short time scales after double-strand breaks.
  • This altered mobility is more pronounced at the site of DNA damage.
  • The Rad51 repair protein regulates this scale-dependent nuclear exploration.

Conclusions:

  • DNA damage leads to a global increase in chromatin persistence length, affecting its dynamics.
  • A model is proposed where repair complex-induced stiffening enhances the ability of breaks to navigate the chromatin meshwork.
  • Rad51 plays a critical role in modulating chromatin dynamics in response to DNA damage.