Histone Methylation
Histone Methylation - 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,...
02:30
Histone Variants at the Centromere
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2020
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...
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.
21:24
Methylated DNA Immunoprecipitation
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Cited by 43 •
2009
This video demonstrates the protocol for methylated DNA immunoprecipitation (MeDIP). MeDIP is a two day procedure that selectively extracts methylated DNA fragments from a genomic DNA sample using antibodies with specificity for 5 -methylcytosine (anti-5 mC).
FAQs
The biological effect depends partly on where the methyl group is placed. Histone methyltransferases target particular lysine or arginine residues, so different marks can produce different regulatory consequences rather than one uniform response. Demethylases provide a counteracting activity by removing those marks. Examining both enzyme classes and their target residues helps explain how chromatin regulation is controlled.
Changes in methylation can influence how tightly DNA is packaged within chromatin. Greater or reduced accessibility affects whether regulatory machinery can use nearby genes, linking a chemical mark on histones to altered gene activity. The outcome is therefore interpreted in relation to chromatin state and genomic location, rather than as an isolated change in histone chemistry.
Histone methylation is not a permanently fixed regulatory signal because demethylases can remove marks after methyltransferases add them. This reversible balance allows cells to adjust chromatin-associated gene regulation as biological conditions change. Studying the opposing enzyme activities is especially relevant for understanding transitions during development, differentiation, and responses to environmental signals.
Comparing methylation patterns across differentiating cells can help researchers investigate how cell-specific gene regulation emerges. Because these marks influence chromatin accessibility and nearby gene activity, they provide a molecular link between changes in cell state and changes in gene expression. This makes histone methylation relevant to studies of development and differentiation, where cells acquire distinct biological roles.
Histone methylation contributes to genomic stability, so changes in its patterns may be considered alongside gene regulation when researchers investigate how cells preserve stable genetic function. This perspective broadens analysis beyond whether nearby genes are activated or repressed. It connects chromatin-associated marks with a cellular outcome relevant to development, differentiation, and disease-focused biology.
Abnormal histone methylation patterns can disrupt gene regulation and are associated with cancer. Because methyltransferases add marks and demethylases remove them, these enzymes represent control points through which researchers can examine altered chromatin regulation. Studying them may clarify how disease-associated epigenetic changes arise and supports investigation of therapeutic strategies directed at abnormal methylation mechanisms.