Department of Biochemistry and Molecular Pharmacology; UMass Metabolic Network
Genomics | Structural Biology
Chromatin is thought to carry epigenetic information from one generation to the next, although it is unclear how such information survives the disruptions of nucleosomal architecture occurring during genomic replication. Here, we measure a key aspect of chromatin structure dynamics during replication-how rapidly nucleosome positions are established on the newly replicated daughter genomes. By isolating newly synthesized DNA marked with 5-ethynyl-2'-deoxyuridine (EdU), we characterize nucleosome positions on both daughter genomes of S. cerevisiae during chromatin maturation. We find that nucleosomes rapidly adopt their mid-log positions at highly transcribed genes, which is consistent with a role for transcription in positioning nucleosomes in vivo. Additionally, experiments in hir1Delta mutants reveal a role for HIR in nucleosome spacing. We also characterized nucleosome positions on the leading and lagging strands, uncovering differences in chromatin maturation dynamics at hundreds of genes. Our data define the maturation dynamics of newly replicated chromatin and support a role for transcription in sculpting the chromatin template.
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Open Access funded by European Research Council.
DOI of Published Version
Cell Rep. 2016 Sep 6;16(10):2651-65. doi: 10.1016/j.celrep.2016.07.083. Epub 2016 Aug 25. Link to article on publisher's site
Vasseur P, Tonazzini S, Ziane R, Camasses A, Rando OJ, Radman-Livaja M. (2016). Dynamics of Nucleosome Positioning Maturation following Genomic Replication. Open Access Publications by UMass Chan Authors. https://doi.org/10.1016/j.celrep.2016.07.083. Retrieved from https://escholarship.umassmed.edu/oapubs/2914
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