Epigenetic Histone Modifications
Epigenetic Histone Modifications - Related Videos
02:32
Histone Modification
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2020
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,...
11:02
Complete Workflow for Analysis of Histone Post-translational Modifications Using Bottom-up Mass Spectrometry: From Histone Extraction to Data Analysis
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Cited by 227 •
2016
This protocol outlines a fully integrated workflow for characterizing histone post-translational modifications using mass spectrometry (MS). The workflow includes histone purification from cell cultures or tissues, histone derivatization and digestion, MS analysis using nano-flow liquid chromatography and instructions for data analysis. The protocol is designed for completion within 2 - 3 days.
10:54
Extraction of Histones from Clinical Specimens for Epigenetic Profiling by Mass Spectrometry
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2025
This protocol enables efficient histone extraction from various clinical samples for subsequent post-translational modification analysis by LC-MS/MS. By facilitating robust detection of key histone modifications, it serves as a valuable tool for comprehensive epigenetic profiling in large clinical cohorts.
07:08
Detection of Histone Modifications in Plant Leaves
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Cited by 22 •
2011
A reliable and useful approach to detect histone modifications on specific plant genes is described. The approach combines chromatin immunoprecipitation (ChIP) and real-time quantitative PCR. It allows detection of histone modifications on specific genes with a role in diverse physiological processes.
10:21
An Overview of Epigenetics
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2023
Since the early days of genetics research, scientists have noted certain heritable phenotypic differences that are not due to differences in the nucleotide sequence of DNA. Current evidence suggests that these “epigenetic” phenomena might be controlled by a number of mechanisms, including the modification of DNA cytosine bases with methyl groups, the addition of various chemical groups to histone proteins, and the recruitment of protein factors to specific DNA sites via interactions with...
FAQs
A modification’s effect depends on where it occurs on histone proteins and how its pattern is interpreted. Histone methylation can support either gene activation or repression, so the mark cannot be understood in isolation from its location. This context helps explain why identical chemical categories may produce different transcriptional outcomes in different genomic regions or cellular states.
Writers place chemical groups on histone tails, erasers remove those groups, and reader proteins recognize the resulting patterns. Together, these components create a reversible regulatory system rather than a permanent change to DNA. Their coordinated activity can alter chromatin accessibility and determine whether transcription-related machinery can access genes, allowing cells to adjust gene activity over time.
Reversibility allows cells to change gene accessibility without changing the underlying nucleotide sequence. Adding or removing histone marks can therefore shift chromatin between states that are more or less available for transcription. This flexibility is important when gene regulation must respond to changing cellular programs, including those associated with development, differentiation, or disease-related changes.
Histone acetylation is often associated with more open chromatin, which makes genes more available for transcription. Histone methylation has a less uniform outcome because it can activate or repress genes depending on its location. Comparing these modifications therefore requires attention to both the chemical mark and its position, rather than assuming that every modification has one universal effect.
Researchers can examine modification patterns alongside changes in chromatin accessibility and gene transcription during differentiation or development. Comparing these features across cellular states helps reveal which regulatory marks accompany shifts in gene availability. This approach connects molecular changes on histones with the biological transitions that produce distinct cell types and developmental outcomes.
Disease-associated changes in histone modifications may alter chromatin accessibility and disrupt normal gene regulation. Studying these patterns can therefore help explain disease mechanisms by linking chemical marks with inappropriate gene activity. Because the modifications are reversible, their regulatory enzymes and pathways are also considered potential targets for epigenetic therapies, as supported by the broader study of these mechanisms.