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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.
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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
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Spreading of Chromatin Modifications

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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.
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...

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Related Experiment Video

Updated: Aug 4, 2025

Detection of Modified Forms of Cytosine Using Sensitive Immunohistochemistry

Detection of Modified Forms of Cytosine Using Sensitive Immunohistochemistry

Published on: August 16, 2016

Aging: Epigenetic modifications.

Sarita Mishra¹, Mahima Raval², Akanksha Singh Kachhawaha¹

¹Laboratory of Forensic Chemistry & Toxicology, School of Forensic Sciences, National Forensic Sciences University (NFSU), Gandhinagar, Gujarat, India.

Progress in Molecular Biology and Translational Science

|April 5, 2023

Summary

Aging is a complex decline, but epigenetics offers hope. Understanding DNA methylation, histone modification, and non-coding RNA can lead to therapies that delay aging and improve health.

Keywords:

Age-related diseases Aging DNA methylation Epigenetics Histone modification Neurodegenerative diseases Non-coding RNA

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Related Experiment Videos

Last Updated: Aug 4, 2025

Detection of Modified Forms of Cytosine Using Sensitive Immunohistochemistry

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Published on: August 16, 2016

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

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Characterizing Histone Post-translational Modification Alterations in Yeast Neurodegenerative Proteinopathy Models

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Published on: March 24, 2019

Area of Science:

Gerontology and Molecular Biology

Background:

Aging is an irreversible process leading to functional decline and increased disease risk.
Lifestyle factors like diet and exercise may influence aging.
Epigenetic mechanisms are increasingly recognized as crucial in the aging process.

Purpose of the Study:

To explore the role of epigenetics in aging and age-related diseases.
To highlight the potential of epigenetic modifications as therapeutic targets for delaying aging.

Main Methods:

Review of existing scientific literature on epigenetics and aging.
Analysis of epigenetic mechanisms including DNA methylation, histone modification, and non-coding RNA.

Main Results:

Epigenetic modifications significantly influence gene expression, DNA replication, and repair.
These modifications are implicated in the development of aging and associated pathologies.
Targeting epigenetic pathways presents novel therapeutic opportunities.

Conclusions:

Epigenetics is a key factor in understanding and potentially mitigating the aging process.
Modulating epigenetic mechanisms may offer new strategies for age-delaying interventions and health rejuvenation.