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Related Concept Videos

Euchromatin01:01

Euchromatin

6.7K
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...
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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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Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
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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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Updated: May 9, 2025

Mapping Mammalian 3D Genome Interactions with Micro-C-XL
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Chrombus-XMBD: a graph convolution model predicting 3D-genome from chromatin features.

Yuanyuan Zeng1,2, Zhiyu You2, Jiayang Guo2

  • 1Department of Hematology, The First Affiliated Hospital of Xiamen University and Institute of Hematology, School of Medicine, Xiamen University, Xiamen, Fujian 361102, China.

Briefings in Bioinformatics
|May 2, 2025
PubMed
Summary
This summary is machine-generated.

ChrombusXMBD predicts 3D chromatin interactions using a novel graph convolution model. This tool enhances understanding of gene regulation by accurately mapping genome-wide chromatin contacts.

Keywords:
de novo prediction3D-genomeepigenomic featuresgraph autoencoderlong-range interactionmodel generalizability

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Area of Science:

  • Genomics
  • Computational Biology
  • Molecular Biology

Background:

  • The three-dimensional (3D) conformation of chromatin is essential for regulating gene transcription.
  • Existing experimental methods for genome 3D structure determination are expensive and context-specific.

Purpose of the Study:

  • To develop a computational model, ChrombusXMBD, for predicting chromatin interactions from available chromatin features.
  • To provide a generalizable tool for analyzing chromatin dynamics and cis-regulation of gene expression.

Main Methods:

  • ChrombusXMBD utilizes dynamic edge convolution with a multihead attention mechanism.
  • The model encodes 2D chromatin features into a learnable embedding space to generate genome-wide 3D contact maps.
  • The approach predicts chromatin interactions ab initio.

Main Results:

  • ChrombusXMBD accurately recapitulated topological domains, expression quantitative trait loci, and promoter/enhancer interactions.
  • The model demonstrated superior performance in predicting chromatin interactions from 1-2 Mb, improving correlation by 11.8%-48.7%.
  • ChrombusXMBD successfully predicted long-range interactions (>2 Mb) and showed generalizability across human and mouse cell lines.

Conclusions:

  • ChrombusXMBD offers a novel, generalizable analytical tool for studying chromatin interactions and gene cis-regulation.
  • The model's parameters provide insights into the biological mechanisms governing cistrome organization.
  • This computational approach overcomes limitations of experimental techniques for 3D genome structure analysis.