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• W2103932291 abstract "Chromosome territories (CTs) constitute a major feature of nuclear architecture. Recent progress in three-dimensional (3D) super-resolution microscopy further supports the following functional model of chromatin organisation: CTs consist of interconnected assemblies of approximately 1 Mb chromatin domains (CDs). These domains are permeated by a 3D channel system, the so-called interchromatin compartment (IC), which may serve as a preferential compartment for ribonucleic acid (RNA) transport. Wider parts of the IC are nearly deoxyribonucleic acid (DNA) free, expand between CTs and accommodate splicing speckles and nuclear bodies. The interior of CDs contains transcriptionally silent chromatin, whereas their periphery represents a zone of decondensed, transcriptionally competent chromatin. This perichromatin region borders on the network of IC channels and is the site of RNA transcription and DNA replication. During interphase large-scale movements of CTs are typically absent, although exceptions may exist. In contrast, chromosome neighbourhood arrangements change profoundly during prometaphase resulting in variable CT neighbourhoods arrangements in cycling cells.Key Concepts: Each individual chromosome occupies a distinct region (territory) of the nuclear space.Chromosome territories (CTs) do not occupy fixed positions in the nucleus but show a polarised radial orientation: gene-dense chromatin is typically located towards the nuclear interior and gene-poor chromatin at the nuclear periphery.During interphase large-scale movement of chromatin is not typically observed. Nuclear rotational movements are likely essential for chromatin reorganisation during post-mitotic differentiation.In cycling cells profound repositioning of chromatin occurs during prometaphase, resulting in new CT neighbourhoods in subsequent daughter nuclei.Recently developed 3D super-resolution light microscopy provides detailed insight into chromatin ultrastructure and increasing evidence for a highly compartmentalised functional organisation of CTs.We postulate that CTs are built up from interconnected approximately 1 Mb chromatin domains (CD). CDs are permeated by a network of channels, which constitute the interchromatin compartment (IC). The IC is connected to nuclear pores. It accommodates splicing speckles and nuclear bodies and provides a compartment for RNA transport. A zone of decondensed chromatin, called the perichromatin region (PR), is located at the periphery of CDs and lines the IC. It constitutes the site of transcription, splicing, DNA-replication and possibly also DNA-repair.Keywords:nuclear architecture;chromosome territories;chromatin domains;interchromatin compartment;perichromatin;chromatin organisation;super-resolution light microscopy" @default.
• W2103932291 created "2016-06-24" @default.
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• W2103932291 date "2006-01-27" @default.
• W2103932291 modified "2023-09-27" @default.
• W2103932291 title "Chromatin in the Cell Nucleus: Higher-order Organization" @default.
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• W2103932291 doi "https://doi.org/10.1038/npg.els.0005768" @default.
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