Observation of live chromatin dynamics in cells via 3D localization microscopy using tetrapod point spread functions

Yoav Shechtman, Anna Karin Gustavsson, Petar N. Petrov, Elisa Dultz, Maurice Y. Lee, Karsten Weis, W. E. Moerner

Research output: Contribution to journalArticlepeer-review

Abstract

We report the observation of chromatin dynamics in living budding yeast (Saccharomyces cerevisiae) cells, in three-dimensions (3D). Using dual color localization microscopy and employing a Tetrapod point spread function, we analyze the spatio-temporal dynamics of two fluorescently labeled DNA loci surrounding the GAL locus. From the measured trajectories, we obtain different dynamical characteristics in terms of inter-loci distance and temporal variance; when the GAL locus is activated, the 3D inter-loci distance and temporal variance increase compared to the inactive state. These changes are visible in spite of the large thermally- and biologically-driven heterogeneity in the relative motion of the two loci. Our observations are consistent with current euchromatin vs. heterochromatin models.

Original languageEnglish
Article number#304344
Pages (from-to)5735-5748
Number of pages14
JournalBiomedical Optics Express
Volume8
Issue number12
DOIs
StatePublished - 1 Dec 2017

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Atomic and Molecular Physics, and Optics

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