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Related Concept Videos

Histone Modification02:32

Histone Modification

14.6K
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...
14.6K
Histone Modification02:32

Histone Modification

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Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
9.5K
Heterochromatin02:38

Heterochromatin

12.0K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
12.0K
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

8.1K
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...
8.1K

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Related Experiment Video

Updated: May 4, 2026

Author Spotlight: Enhanced Histone PTM Isomer Identification Through LC-TIMS-ToF MS/MS and PASEF
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Author Spotlight: Enhanced Histone PTM Isomer Identification Through LC-TIMS-ToF MS/MS and PASEF

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Identification and interrogation of combinatorial histone modifications.

Kelly R Karch1, Jamie E Denizio1, Ben E Black1

  • 1Epigenetics Program, Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania Philadelphia, PA, USA.

Frontiers in Genetics
|January 7, 2014
PubMed
Summary

Histone post-translational modifications (PTMs) are crucial for cellular processes. Mass spectrometry advances enable detailed analysis of these modifications and their biological relevance in chromatin.

Keywords:
chromatindeuterium exchangehistonehistone codehistone variantsmass spectrometrypost-translational modificationproteomics

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Complete Workflow for Analysis of Histone Post-translational Modifications Using Bottom-up Mass Spectrometry: From Histone Extraction to Data Analysis
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The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin
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Complete Workflow for Analysis of Histone Post-translational Modifications Using Bottom-up Mass Spectrometry: From Histone Extraction to Data Analysis
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The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • Histone proteins undergo dynamic post-translational modifications (PTMs) that regulate key cellular processes like gene transcription and DNA repair.
  • Specific combinations of histone PTMs on chromatin recruit non-histone proteins, mediating biological functions.
  • Understanding histone PTMs is vital for deciphering cellular regulation.

Purpose of the Study:

  • To review advancements in mass spectrometry for analyzing histone PTMs.
  • To discuss methods for investigating the biological significance of combinatorial histone modifications.
  • To highlight the role of mass spectrometry in unbiased discovery and quantification of histone PTMs.

Main Methods:

  • Mass spectrometry (MS) for unbiased discovery and quantification of histone PTMs.
  • MS techniques enabling characterization of large histone peptides and intact proteins.
  • Biochemical, biophysical, and chemical biology approaches to determine biological relevance of PTMs.

Main Results:

  • Mass spectrometry has become indispensable for comprehensive histone PTM analysis.
  • Recent MS developments allow simultaneous characterization of multiple PTMs on single histone polypeptides.
  • Various techniques are available to probe the functional impact of histone modification combinations.

Conclusions:

  • Advancements in mass spectrometry have significantly enhanced the study of histone PTMs.
  • Investigating combinatorial histone codes in their nucleosomal context is crucial for understanding cellular regulation.
  • This review provides an overview of MS-based histone PTM analysis and functional validation strategies.