High-resolution mapping of the spatial organization of Caulobacter crescentus chromosome by chromosome conformation capture in conjunction with next-generation sequencing (Hi-C)
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ABSTRACT: Chromosomes must be highly compacted and organized within cells, but how this is achieved in vivo remains poorly understood. We report the first use of Hi-C to map the structure of bacterial chromosomes at a high, unprecedented resolution. Analysis of Hi-C data and polymer modeling indicates that the Caulobacter crescentus chromosome consists of multiple, largely independent spatial domains likely comprised of supercoiled plectonemes arrayed into a bottlebrush-like fiber. These domains are stable throughout the cell cycle and re-established concomitantly with DNA replication. We provide strong evidence that domain boundaries are established by highly-expressed genes and the formation of plectoneme-free regions. Additionally, we use Hi-C to demonstrate that supercoiling, the histone-like protein HU, and SMC act at different length-scales and in complementary ways to organize and structure chromosomes within cells.
ORGANISM(S): Caulobacter vibrioides CB15
PROVIDER: GSE45966 | GEO | 2013/10/30
SECONDARY ACCESSION(S): PRJNA196826
REPOSITORIES: GEO
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