Histone Methylation Analysis
Histone Methylation Analysis - Related Videos
08:47
DNA Methylation Analysis
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2023
Methylation at CpG dinucleotides is a chemical modification of DNA hypothesized to play important roles in regulating gene expression. In particular, the methylation of clusters of methylation sites, called “CpG islands”, near promoters and other gene regulatory elements may contribute to the stable silencing of genes, for example, during epigenetic processes such as genomic imprinting and X-chromosome inactivation. At the same time, aberrant CpG methylation has been shown to be associated with...
09:47
Analysis of Histone Antibody Specificity with Peptide Microarrays
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Cited by 22 •
2017
This manuscript describes methods for applying peptide microarray technology to specificity profiling of antibodies that recognize histones and their post-translational modifications.
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.
12:34
DNA Methylation: Bisulphite Modification and Analysis
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Cited by 75 •
2011
The gold standard for DNA methylation analysis is genomic sequencing of bisulphite converted DNA. This method takes advantage of the increased sensitivity of cytosine compared with 5-methylcytosine (5-MeC) to bisulphite deamination under acidic conditions. Unmethylated cytosines can be distinguished from methylated cytosines after PCR amplification of the target genomic DNA.
FAQs
Histone methyltransferases do not add methyl groups randomly: they act on specific lysine or arginine residues. That residue-level specificity gives each modification a defined molecular address on the histone protein. In analysis, identifying the targeted residue helps distinguish one chromatin mark from another and supports more precise interpretation of its relationship to DNA access and gene expression.
The same general type of modification can have different regulatory associations depending on where it occurs and what methylation state is present. Consequently, researchers should not treat every histone methylation signal as equivalent. Interpreting the residue or chromatin location together with the mark's state helps relate the result to either increased or reduced access to DNA and gene expression.
Methyltransferases establish histone methylation marks, whereas demethylases remove them. Their opposing activities make histone-associated regulation changeable rather than fixed, allowing the modification pattern to vary as chromatin control changes. Measuring these marks can therefore provide insight into how cells adjust DNA accessibility and gene-expression programs during biological processes such as differentiation or development.
In a ChIP-seq approach, researchers use an antibody-based chromatin immunoprecipitation step to examine a selected histone modification, then sequence the associated DNA. The resulting data connect the modification to DNA regions and can be interpreted in relation to chromatin access and gene expression. This workflow is suited to location-focused analysis of histone marks.
Sequencing adds positional information to antibody-based detection. After chromatin immunoprecipitation, sequencing identifies the DNA fragments associated with the recognized histone mark, helping researchers determine where that modification occurs across the material examined. Those locations can then be considered alongside chromatin access and gene-expression patterns measured in the same biological investigation.
Histone methylation analysis supports studies of epigenetic regulation by showing how marks vary in relation to DNA access and gene control. The same approach can be applied to cell differentiation and development, where gene-expression programs change, and to disease research, where altered marks may accompany disease-associated changes in gene control.