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Related Concept Videos

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
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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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Euchromatin01:01

Euchromatin

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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.
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Chromatin Position Affects Gene Expression02:35

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
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Heterochromatin02:38

Heterochromatin

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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...
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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.
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Related Experiment Video

Updated: May 28, 2025

Mapping Genome-wide Accessible Chromatin in Primary Human T Lymphocytes by ATAC-Seq
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IGN: Invariable gene set-based normalization for chromatin accessibility profile data analysis.

Shengen Shawn Hu1,2, Hai-Hui Xue3, Chongzhi Zang1,2

  • 1Department of Genome Sciences, University of Virginia, Charlottesville, VA 22908, USA.

Computational and Structural Biotechnology Journal
|February 11, 2025
PubMed
Summary
This summary is machine-generated.

We developed Invariable Gene Normalization (IGN) for ATAC-seq and DNase-seq data. IGN accurately normalizes chromatin accessibility, even with global signal changes, outperforming existing methods for differential analysis.

Keywords:
ATAC-seqChromatin accessibilityDNase-seqDifferential analysisNormalization

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Area of Science:

  • Genomics
  • Epigenetics
  • Computational Biology

Background:

  • Chromatin accessibility assays like ATAC-seq and DNase-seq provide insights into gene regulation.
  • Accurate normalization is crucial for differential analysis of chromatin dynamics.
  • Current methods may fail when global chromatin accessibility levels differ significantly between samples.

Purpose of the Study:

  • To introduce Invariable Gene Normalization (IGN), a novel method for normalizing ATAC-seq and DNase-seq data.
  • To address the limitations of existing normalization techniques that assume uniform genomic signal distributions.
  • To provide a robust tool for differential chromatin accessibility analysis, especially in the presence of global signal variations.

Main Methods:

  • IGN normalizes promoter chromatin accessibility signals using genes with stable expression (from RNA-seq).
  • The method extrapolates these stable signals to normalize genome-wide chromatin accessibility profiles.
  • The effectiveness was demonstrated using central memory CD8+ T cell activation data.

Main Results:

  • IGN effectively normalizes chromatin accessibility data, accounting for global differences between samples.
  • The method outperforms existing normalization techniques in differential analysis.
  • IGN proved effective in analyzing the complex chromatin and gene expression changes during T cell activation.

Conclusions:

  • IGN is the first normalization method for chromatin accessibility that accounts for global signal differences.
  • This method enhances the accuracy of differential ATAC-seq and DNase-seq analyses.
  • IGN offers a widely applicable solution for studying chromatin dynamics and gene regulation.