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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...

Epigenetic Regulation

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...

Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

Chromatin Modification in iPS Cells

Chromatin Modification in iPS Cells

Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...

Histone Modification

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...

Histone Modification

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...

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Related Experiment Video

Updated: Jul 9, 2026

Unveiling Histone Proteoforms using 2D-TAU Gel Electrophoresis

Unveiling Histone Proteoforms using 2D-TAU Gel Electrophoresis

Published on: October 18, 2024

Chromatin-modifying proteins in cancer.

Cathrine K Fog¹, Klaus T Jensen, Anders H Lund

¹Biotech Research & Innovation Centre and Centre for Epigenetics, University of Copenhagen, Ole Maaløes Vej 5, DK- 2200 Copenhagen Denmark.

APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica

|November 29, 2007

Summary

Chromatin-modifying proteins regulate gene expression through epigenetics. Deregulation of these proteins is linked to cancer development and progression, highlighting their role in the disease.

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Area of Science:

Epigenetics and molecular biology.
Cancer biology and genomics.

Background:

Chromatin-modifying proteins control genome accessibility for gene transcription.
Epigenetic gene regulation enables cell-type-specific and time-dependent transcriptional programs.
All cells in an organism possess the same genetic information, but differential gene expression is key.

Purpose of the Study:

To discuss the influence of epigenetic alterations on cancer development.
To review known cancer-associated alterations in chromatin-modifying proteins.

Main Methods:

Review of existing scientific literature and data.
Analysis of the etiological involvement of chromatin-modifying proteins in cancer.

Main Results:

Deregulation of chromatin-modifying proteins is etiologically involved in cancer development and progression.
Epigenetic alterations play a significant role in how cancer develops.

Conclusions:

Understanding alterations in chromatin-modifying proteins is crucial for cancer research.
Epigenetic mechanisms are fundamental to cancer etiology and progression.