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Related Concept Videos

Euchromatin01:01

Euchromatin

7.7K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
7.7K
Heterochromatin02:38

Heterochromatin

14.8K
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...
14.8K
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...
8.6K
Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

11.4K
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...
11.4K
Position-effect Variegation02:32

Position-effect Variegation

6.6K
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.
6.6K

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Characterizing cellular heterogeneity in chromatin state with scCUT&Tag-pro.

Bingjie Zhang1,2, Avi Srivastava1,2, Eleni Mimitou3

  • 1New York Genome Center, New York, NY, USA.

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Summary
This summary is machine-generated.

We developed new tools for single-cell analysis of chromatin, enabling deeper understanding of immune cell function and gene regulation. These methods integrate multiple data types to map dynamic changes in genomic elements.

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Area of Science:

  • Genomics
  • Cell Biology
  • Immunology

Background:

  • Single-cell resolution of chromatin modifications is crucial for functional genomics.
  • Challenges include data sparsity and integrating multiple binding maps.

Purpose of the Study:

  • Introduce single-cell CUT&Tag-pro (sc)CUT&Tag-pro for profiling protein-DNA interactions and surface proteins.
  • Introduce single-cell ChromHMM for inferring and annotating chromatin states from histone modification patterns.

Main Methods:

  • Applied scCUT&Tag-pro and single-cell ChromHMM to circulating human immune cells.
  • Integrated analysis across nine molecular modalities.
  • Developed an integrated reference for mapping and interpreting scCUT&Tag datasets.

Main Results:

  • Characterized dynamic changes in genomic element function across cell states and trajectories.
  • Nominated motifs and regulators establishing chromatin states.
  • Identified cell-type-specific regulatory priming in immune cells.

Conclusions:

  • scCUT&Tag-pro and single-cell ChromHMM provide powerful integrated approaches for single-cell epigenomics.
  • These tools enhance the interpretation of chromatin data and reveal regulatory mechanisms in immune cells.