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Related Concept Videos

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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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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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
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Predicting chromatin organization using histone marks.

Jialiang Huang1,2, Eugenio Marco3,4,5, Luca Pinello6,7

  • 1Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, MA, 02215, USA. jhuang@jimmy.harvard.edu.

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|August 15, 2015
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Summary
This summary is machine-generated.

Researchers developed a computational model to predict chromatin interaction hubs and topologically associated domain (TAD) boundaries using Hi-C and ChIP-seq data. This tool aids in understanding 3D genome organization and guiding experimental exploration.

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Area of Science:

  • Genomics
  • Computational Biology
  • Molecular Biology

Background:

  • Understanding three-dimensional (3D) chromatin organization is crucial for deciphering gene regulation.
  • Genome-wide mapping of chromatin interactions is technically challenging, limiting comprehensive analysis.
  • Identifying key organizational features like interaction hubs and TAD boundaries is essential.

Purpose of the Study:

  • To develop a computational model for predicting chromatin interaction hubs and TAD boundaries.
  • To integrate Hi-C and histone mark ChIP-seq data for enhanced prediction accuracy.
  • To understand the determinants of long-range chromatin interactions.

Main Methods:

  • Developed a computational model integrating Hi-C and histone mark ChIP-seq data.
  • Applied the model to predict chromatin interaction hubs and TAD boundaries.
  • Validated predictions across diverse datasets and cell types.

Main Results:

  • The computational model accurately and robustly predicts chromatin interaction hubs and TAD boundaries.
  • Cell-type specific histone mark data is necessary for predicting interaction hubs.
  • Histone mark data is not required for predicting TAD boundaries.
  • Predictions serve as a valuable guide for experimental chromatin organization studies.

Conclusions:

  • The developed computational model effectively predicts key 3D chromatin organization features.
  • The model highlights the differential requirement of histone mark data for predicting interaction hubs versus TAD boundaries.
  • This approach facilitates the exploration and understanding of genome architecture and its regulatory roles.