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Determinants and dynamics of genome accessibility

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TLDR
The interplay of nucleosome packaging and chromatin access contributes to the regulation of transcription, replication and repair in eukaryotes is discussed by reviewing the current understanding.
Abstract
In eukaryotes, all DNA-templated reactions occur in the context of chromatin. Nucleosome packaging inherently restricts DNA accessibility for regulatory proteins but also provides an opportunity to regulate DNA-based processes through modulating nucleosome positions and local chromatin structure. Recent advances in genome-scale methods are yielding increasingly detailed profiles of the genomic distribution of nucleosomes, their modifications and their modifiers. The picture now emerging is one in which the dynamic control of genome accessibility is governed by contributions from DNA sequence, ATP-dependent chromatin remodelling and nucleosome modifications. Here we discuss the interplay of these processes by reviewing our current understanding of how chromatin access contributes to the regulation of transcription, replication and repair.

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Citations
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Journal ArticleDOI

The accessible chromatin landscape of the human genome

TL;DR: The first extensive map of human DHSs identified through genome-wide profiling in 125 diverse cell and tissue types is presented, revealing novel relationships between chromatin accessibility, transcription, DNA methylation and regulatory factor occupancy patterns.
Journal ArticleDOI

ATAC-seq: A Method for Assaying Chromatin Accessibility Genome-Wide

TL;DR: This method probes DNA accessibility with hyperactive Tn5 transposase, which inserts sequencing adapters into accessible regions of chromatin, which can be used to infer regions of increased accessibility, as well as to map regions of transcription‐factor binding and nucleosome position.
Journal ArticleDOI

Regulation of type I interferon responses

TL;DR: In this paper, the authors summarize the signalling and epigenetic mechanisms that regulate type I IFN-induced STAT activation and ISG transcription and translation and conclude that these regulatory mechanisms determine the biological outcomes of type I ILN responses and whether pathogens are cleared effectively or chronic infection or autoimmune disease ensues.
Journal ArticleDOI

Transcription factors: from enhancer binding to developmental control.

TL;DR: Current knowledge of transcription factor function from genomic and genetic studies is reviewed and how different strategies, including extensive cooperative regulation, progressive priming of regulatory elements, and the integration of activities from multiple enhancers, confer specificity and robustness to transcriptional regulation during development are discussed.
Journal ArticleDOI

Histone methylation: a dynamic mark in health, disease and inheritance

TL;DR: This work provides a broad overview of how histone methylation is regulated and leads to biological outcomes and suggests its links to disease and ageing and possibly to transmission of traits across generations are illustrated.
References
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Journal ArticleDOI

Chromatin Modifications and Their Function

TL;DR: The surface of nucleosomes is studded with a multiplicity of modifications that can dictate the higher-order chromatin structure in which DNA is packaged and can orchestrate the ordered recruitment of enzyme complexes to manipulate DNA.
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Role of Histone H3 Lysine 27 Methylation in Polycomb-Group Silencing

TL;DR: The purification and characterization of an EED-EZH2 complex, the human counterpart of the Drosophila ESC-E(Z) complex, is reported, and it is demonstrated that the complex specifically methylates nucleosomal histone H3 at lysine 27 (H3-K27).
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Capturing Chromosome Conformation

TL;DR: Using the yeast Saccharomyces cerevisiae, this work could confirm known qualitative features of chromosome organization within the nucleus and dynamic changes in that organization during meiosis and found that chromatin is highly flexible throughout.
Journal ArticleDOI

The Role of Chromatin during Transcription

TL;DR: This Review highlights advances in the understanding of chromatin regulation and discusses how such regulation affects the binding of transcription factors as well as the initiation and elongation steps of transcription.
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