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Related Concept Videos

Euchromatin01:01

Euchromatin

6.9K
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...
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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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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...
8.3K
Histone Modification02:32

Histone Modification

13.3K
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...
13.3K
Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

5.5K
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
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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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Updated: Jun 30, 2025

An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues
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An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues

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Robust chromatin state annotation.

Mehdi Foroozandeh Shahraki1, Marjan Farahbod1, Maxwell W Libbrecht2

  • 1School of Computing Science, Simon Fraser University, Burnaby, British Columbia V51 1S6, Canada.

Genome Research
|March 21, 2024
PubMed
Summary
This summary is machine-generated.

New methods assess the reliability of chromatin state annotations derived from segmentation and genome annotation (SAGA) approaches. This work introduces SAGAconf, providing confidence scores to ensure accurate genomic analysis.

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Area of Science:

  • Genomics
  • Epigenetics
  • Bioinformatics

Background:

  • International projects generate vast epigenomic datasets across diverse cell/tissue types.
  • Segmentation and genome annotation (SAGA) methods are standard for summarizing epigenomic data and annotating genomes.
  • Chromatin state annotations are crucial for identifying regulatory elements and interpreting disease genetics.

Purpose of the Study:

  • To address the lack of statistical significance evaluation for chromatin state assignments from SAGA methods.
  • To introduce the first method for assigning calibrated confidence scores to chromatin state annotations.
  • To improve the reliability of genomic annotations for downstream applications.

Main Methods:

  • Comprehensive evaluation of the reproducibility of ChromHMM and Segway, two leading SAGA methods.
  • Development and implementation of SAGAconf, a novel method for assigning confidence scores (r-values) to chromatin state annotations.
  • SAGAconf assigns an r-value to each genomic bin, indicating the probability of label reproducibility in replicated experiments.

Main Results:

  • Existing SAGA methods, ChromHMM and Segway, exhibit frequent irreproducibility in their predictions.
  • Between 27%-69% of predicted enhancers failed to replicate when using the same SAGA method on experimental replicates.
  • A significant portion of elements in current chromatin state annotations may not be reliable.

Conclusions:

  • The proposed SAGAconf method provides a principled approach to evaluate the statistical significance of chromatin state assignments.
  • SAGAconf enables researchers to select reliable predictions from chromatin annotations, enhancing downstream genomic analyses.
  • This method ensures greater confidence in the interpretation of epigenomic data and its application in various biological contexts.