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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.

Epigenetic Regulation

Epigenetic Regulation

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

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: Jun 6, 2026

An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues

An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues

Published on: April 5, 2018

Chromatin: a molecular interface between cancer and aging.

Hazel A Cruickshanks¹, Peter D Adams

¹University of Glasgow, CR-UK Beatson Labs, Garscube Estate, Switchback Road, Glasgow G61 1BD, United Kingdom.

Current Opinion in Genetics & Development

|November 20, 2010

Summary

Mammals use chromatin regulation for tumor suppression via senescence and apoptosis. However, age-related chromatin disruption paradoxically promotes cancer, highlighting its dual role in aging and cancer development.

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Techniques to Induce and Quantify Cellular Senescence

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

Area of Science:

Cancer Biology
Aging Research
Epigenetics

Background:

Mammals possess tumor suppression mechanisms like senescence and apoptosis to prevent cancer.
These processes are critically dependent on the regulation of chromatin structure.
Age is the primary risk factor for cancer, with accumulating chromatin defects potentially contributing to this increased incidence.

Purpose of the Study:

To explore the dual role of chromatin structure in cancer suppression and promotion.
To investigate the link between age-associated chromatin alterations and cancer incidence.

Main Methods:

Analysis of chromatin regulation in tumor suppression pathways.
Examination of age-associated changes in chromatin structure.
Correlation of chromatin defects with cancer risk in aging tissues.

Main Results:

Chromatin-dependent pathways are activated in premalignant and aged tissues.
Disruption of chromatin structure can paradoxically promote cancer development.
Age-associated chromatin perturbations correlate with increased cancer incidence.

Conclusions:

Chromatin alterations play a complex, dual role in cancer, acting as both a suppressor and promoter.
The aging process is intrinsically linked to changes in chromatin structure that influence cancer onset.