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Spreading of Chromatin Modifications

Spreading of Chromatin Modifications

The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...

Euchromatin

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...

Chromatin Position Affects Gene Expression

Chromatin Position Affects Gene Expression

Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...

Heterochromatin

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...

Euchromatin

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...

Heterochromatin

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...

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Related Experiment Video

Updated: May 11, 2026

Promoter Capture Hi-C: High-resolution, Genome-wide Profiling of Promoter Interactions

Promoter Capture Hi-C: High-resolution, Genome-wide Profiling of Promoter Interactions

Published on: June 28, 2018

Chromatin decouples promoter threshold from dynamic range.

Felix H Lam¹, David J Steger, Erin K O'Shea

¹Howard Hughes Medical Institute, Department of Molecular and Cellular Biology, Faculty of Arts and Sciences Center for Systems Biology, Harvard University, 7 Divinity Avenue, Bauer 307, Cambridge, Massachusetts 02138, USA.

|April 18, 2008

Summary

This summary is machine-generated.

Nucleosomes control gene expression by separating the induction threshold from the dynamic range. Promoter variants reveal how binding site affinity and chromatin remodeling fine-tune gene activation in response to environmental signals.

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Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Chromatin structure, specifically nucleosome positioning, plays a critical role in regulating gene expression by controlling DNA accessibility.
In Saccharomyces cerevisiae, promoters typically feature a nucleosome-free region (NFR) upstream of the translation start site, where transcription factors bind and initiate chromatin remodeling.
The precise mechanisms by which transcription factor binding and chromatin organization influence the quantitative aspects of gene expression remain incompletely understood.

Purpose of the Study:

To investigate how nucleosomes and transcription factor binding affinity modulate the threshold of gene induction and the dynamic range of expression.
To elucidate the role of promoter architecture in fine-tuning gene expression in response to varying environmental conditions.

Main Methods:

Construction and analysis of a series of promoter variants in Saccharomyces cerevisiae.
Quantitative assessment of gene activation in response to varying physiological stimuli.
Examination of the Saccharomyces cerevisiae phosphate (PHO) response pathway to understand promoter design in environmental adaptation.

Main Results:

Nucleosomes primarily function to decouple the threshold of gene induction from the dynamic range of expression.
The affinity of transcription factor binding sites directly impacts the level of stimulus required for gene activation.
Binding sites within nucleosomal regions contribute to scaling gene expression levels after chromatin remodeling.
The PHO pathway utilizes distinct promoter designs to adapt gene expression to different environmental phosphate concentrations.

Conclusions:

The interplay between chromatin structure and binding site affinity provides a sophisticated mechanism for fine-tuning gene expression responses.
These findings offer insights into the quantitative control of eukaryotic transcription and may inform the development of more detailed transcriptional models.