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Related Concept Videos

Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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Histone Modification02:32

Histone Modification

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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
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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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...
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Position-effect Variegation02:32

Position-effect Variegation

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Spreading of Chromatin Modifications02:25

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.
Writers
The writer...
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Related Experiment Video

Updated: Aug 15, 2025

Chromatin Immunoprecipitation ChIP of Histone Modifications from Saccharomyces cerevisiae
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Chromatin Immunoprecipitation ChIP of Histone Modifications from Saccharomyces cerevisiae

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scChIX-seq infers dynamic relationships between histone modifications in single cells.

Jake Yeung1,2, Maria Florescu3, Peter Zeller3

  • 1Oncode Institute, Hubrecht Institute-KNAW (Royal Netherlands Academy of Arts and Sciences) and University Medical Center Utrecht, Utrecht, the Netherlands. jake.yeung@ist.ac.at.

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|January 2, 2023
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Summary
This summary is machine-generated.

scChIX-seq enables mapping multiple histone modifications in single cells, revealing their interplay in gene regulation. This advance allows for deeper understanding of chromatin dynamics and cell differentiation.

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Area of Science:

  • Epigenetics and Genomics
  • Single-cell Biology
  • Molecular Biology

Background:

  • Chromatin states regulate gene expression through dynamic histone modifications.
  • Current single-cell methods are limited to profiling only one histone mark per cell.
  • Understanding the interplay of multiple histone marks is crucial for deciphering gene regulation.

Purpose of the Study:

  • To develop a novel framework for simultaneously mapping multiple histone modifications in single cells.
  • To enable multimodal analysis of histone mark combinations and their functional implications.
  • To investigate the dynamics of chromatin modifications during cellular processes like differentiation.

Main Methods:

  • Introduction of scChIX-seq (single-cell chromatin immunocleavage and unmixing sequencing).
  • Multiplexing of two histone marks per single cell.
  • Computational deconvolution of signals using cell-type-specific correlation structures.

Main Results:

  • Demonstration of scChIX-seq for multimodal analysis of various histone mark combinations.
  • Successful modeling of in vitro macrophage differentiation dynamics using integrated chromatin velocity.
  • Validation of the framework's ability to learn cell-type-specific histone mark correlations without prior genomic assumptions.

Conclusions:

  • scChIX-seq provides a powerful tool for systematic interrogation of histone modification interplay at single-cell resolution.
  • This method overcomes previous limitations in single-cell histone mark profiling.
  • Enables new avenues for studying epigenomic regulation and cellular heterogeneity.