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Related Concept Videos

Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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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.
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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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Related Experiment Video

Updated: Feb 7, 2026

CRISPR-Mediated Reorganization of Chromatin Loop Structure
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Rich Chromatin Structure Prediction from Hi-C Data.

Laraib Malik, Rob Patro

    IEEE/ACM Transactions on Computational Biology and Bioinformatics
    |July 12, 2018
    PubMed
    Summary

    We developed a new method to identify hierarchical chromatin domains from 3D genome data. This approach reveals nested structures, improving our understanding of genome organization and function.

    Area of Science:

    • Genomics
    • Computational Biology
    • Molecular Biology

    Background:

    • 3D chromatin conformation plays a crucial role in cellular processes.
    • Topologically associating domains (TADs) are densely interacting chromosomal segments.
    • Existing methods often assume non-overlapping TADs, despite evidence for nested structures.

    Purpose of the Study:

    • To develop a methodology for predicting hierarchical chromatin domains using chromatin conformation capture data.
    • To address the limitation of non-overlapping domain assumptions in current algorithms.

    Main Methods:

    • Predicting chromatin domains at multiple resolutions based on intrinsic data properties.
    • Clustering domains to construct a hierarchical structure.
    • Maximizing intra-domain interaction frequencies for non-overlapping domains at each level.

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    Main Results:

    • The predicted hierarchical structure is enriched for actively transcribing housekeeping genes and chromatin markers like CTCF at boundaries.
    • Large-scale domains are conserved across different cell types and species.
    • Comparisons show advantages over existing hierarchical domain extraction tools.

    Conclusions:

    • The developed methodology accurately predicts hierarchical chromatin domains, reflecting a nested genome organization.
    • This approach enhances the understanding of 3D genome structure and its functional implications.
    • The software Matryoshka is available for predicting hierarchical chromatin domains.