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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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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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Genome Annotation and Assembly03:36

Genome Annotation and Assembly

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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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Chromatin Immunoprecipitation- ChIP02:36

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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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Combinatorial Gene Control02:33

Combinatorial Gene Control

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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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Updated: Jan 15, 2026

A Computational Pipeline for Intergenic/Intragenic Enhancer RNA Quantification in Mouse Embryonic Stem Cells
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Integrative chromatin state annotation of 234 human ENCODE4 cell types using Segway.

Marjan Farahbod1, Aboud Diab1, Paul Sud2

  • 1Simon Fraser University.

Genome Research
|October 6, 2025
PubMed
Summary

The ENCODE4 Catalog provides detailed epigenetic maps of human tissues, identifying regulatory elements crucial for understanding cell function and disease. This resource aids in discovering genomic elements linked to phenotypes.

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Area of Science:

  • Genomics and Epigenetics
  • Human Physiology and Disease

Background:

  • The ENCODE consortium's final phase profiled epigenetic activity across numerous human tissues.
  • Chromatin state annotations, particularly using Segmentation and Genome Annotation (SAGA) methods like Segway, are key for summarizing complex genomic data.

Purpose of the Study:

  • To present the ENCODE4 Catalog of Segway Annotations, offering sample-specific, genome-wide chromatin state annotations.
  • To utilize data from 1,794 genomics experiments across 234 human biosamples.

Main Methods:

  • Application of Segmentation and Genome Annotation (SAGA) methods, specifically Segway, for chromatin state annotation.
  • Inference of genome-wide chromatin state annotations for 234 human biosamples.

Main Results:

  • The catalog identifies specific genomic elements and accurately captures cell type-specific regulatory patterns.
  • Generated annotations from 1,794 genomics experiments, covering 234 human biosamples.

Conclusions:

  • The ENCODE4 Catalog serves as a comprehensive resource for understanding human epigenetics.
  • Facilitates the discovery of genomic elements involved in human phenotype and disease.