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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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Chromatin Position Affects Gene Expression02:35

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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Euchromatin01:01

Euchromatin

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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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Inheritance of Chromatin Structures03:17

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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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Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Chromatin Packaging01:32

Chromatin Packaging

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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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The coordination between CTCF, cohesin and TFs impacts nucleosome repositioning and chromatin insulation to define

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    Summary

    Cell type-specific gene regulation involves CTCF and cohesin. Their binding stability and overlap depend on DNA accessibility, binding sequences, and transcription factor motifs, influencing chromatin organization.

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    Area of Science:

    • Genomics
    • Epigenetics
    • Molecular Biology

    Background:

    • CTCF-mediated chromatin folding is crucial for gene regulation.
    • Mechanisms for cell type-specific control of CTCF and cohesin remain unclear.

    Purpose of the Study:

    • To elucidate the mechanisms governing cell type-specific CTCF binding and cohesin overlap.
    • To understand how transcription factor motifs influence chromatin organization.

    Main Methods:

    • Comparative genomic analyses in mice and humans.
    • Assessment of DNA accessibility and transcription factor motif enrichment at CTCF binding sites.

    Main Results:

    • Species-specific differences in accessibility and CTCF binding site sequences regulate CTCF and cohesin.
    • Nucleosome positioning by CTCF is influenced by accessibility, while cohesin phasing is affected by surrounding motifs.
    • Cell type-specific transcription factor enrichment at CTCF sites impacts chromatin insulation and organization.

    Conclusions:

    • CTCF profiles are cell type-specific due to local and long-range chromatin organization mechanisms.
    • Transcription factor motifs play a key role in stabilizing or destabilizing CTCF binding and influencing gene regulation.