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Hsieh, Tsung-Han S.; Weiner, Assaf; Lajoie, Bryan; Dekker, Job; Friedman, Nir; Rando, Oliver J.
Cell, 07/2015, Letnik: 162, Številka: 1Journal Article
We describe a Hi-C-based method, Micro-C, in which micrococcal nuclease is used instead of restriction enzymes to fragment chromatin, enabling nucleosome resolution chromosome folding maps. Analysis of Micro-C maps for budding yeast reveals abundant self-associating domains similar to those reported in other species, but not previously observed in yeast. These structures, far shorter than topologically associating domains in mammals, typically encompass one to five genes in yeast. Strong boundaries between self-associating domains occur at promoters of highly transcribed genes and regions of rapid histone turnover that are typically bound by the RSC chromatin-remodeling complex. Investigation of chromosome folding in mutants confirms roles for RSC, “gene looping” factor Ssu72, Mediator, H3K56 acetyltransferase Rtt109, and the N-terminal tail of H4 in folding of the yeast genome. This approach provides detailed structural maps of a eukaryotic genome, and our findings provide insights into the machinery underlying chromosome compaction. Display omitted •Novel method for nucleosome-resolution analysis of chromosome folding•Self-associating domains in yeast are far shorter than those in mammals•Identification of several factors involved in chromosome folding•Evidence for a tri- or tetra-nucleosome motif in chromatin fibers Mononucleosome resolution mapping of chromosome folding in yeast reveals self-associating domains similar to those found in other organisms. But they are far shorter, with domain size being scaled by gene number rather than linear distance.
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